The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
A POSSIBLE ASSOCIATION BETWEEN GINGIVAL CREVICULAR FLUID INFLAMMATORY CYTOKINES AND RHEUMATOID ARTHRITIS DISEASE ACTIVITY
1
7
EN
Maha
Mahmoud
Assistant Professor of Oral Medicine, Periodontology, Oral Diagnosis and Radiology, Faculty of Dentistry, Alexandria University
Rania
AbdElAziz
Fahmy
Lecturer of Oral Medicine, Peiodontology, Oral Diagnosis and Radiology, Faculty of Dentistry, Alexandria University
Mona
mohamed
Ashraf
Internal Medicine Specialist, Rheumatology Department, Faculty of Medicine, Alexandria University
10.21608/edj.2016.92626
<strong>Backgroud</strong>: Rheumatoid arthritis (RA) and chronic periodontitis are the most common chronic inflammatory diseases with remarkable pathological and clinical similarities
<strong>Aim</strong>: This study was performed to determine a possible relation between the severity of chronic periodontitis together with increased local inflammation of the periodontium and RA disease activity.
<strong>Methods</strong>: This study was conducted on 20 patients with Rheumatoid Arthritis fulfilling the 2010 ACR/EULAR classification criteria for RA. All subjects were recruited from those attending the Rheumatology Unit and Rheumatology outpatient clinic at the Alexandria main University Hospital. Rheumatoid disease activity was assessed by DAS-28 score system. The periodontal status was assessed by measuring PD, CAL, PI and GI. Local proinflammatory cytokines from the gingival crevicular fluid (GCF) were quantified including Il-6 and TNF-α. Correlations between different parameters were assessed using Spearman coefficient
<strong>Results</strong>: A positive correlation was found between DAS28 and both GCF IL-6 and TNF-α (p=0.694- r=0.001 ) and (p=0.604- r=0.005) for IL-6 and TNF- α respectively and the values were statistically significant. A positive correlation was also found between DAS28 and each of PD (p=0.246, r=0.297), CAL (p= 0.244, r=0.300), PI (p= 0.406, r= 0.076)and GI (p= 0.340,r= 0.142) however the correlation was not statistically significant.
<strong>Conclusion</strong>: The findings provide evidence of a possible relation between Rheumatoid Arthritis and chronic periodontitis through sharing the same inflammatory mechanism.
https://edj.journals.ekb.eg/article_92626.html
https://edj.journals.ekb.eg/article_92626_b3f46aa02c3c23e1d23ab47e2a3eb57b.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
MARGINAL MICROLEAKAGE OF FIVE DIFFERENT GLASS IONOMER RESTORATIONS IN PRIMARY TEETH WITH OR WITHOUT POLISHING
9
19
EN
Ghada
Mohamed Mahmoud
Aly
Lecturer of Pediatric Dentistry. Modern Science and Arts University. Cairo, Egypt
Nehal
Refaat
Kabel
Lecturer of Pediatric Dentistry. Misr University for Sience and Technology. Cairo, Egypt
Dawlat
Mostafa
Ahmed
Lecturer of Dental Biomaterials. Alexandria University. Alexandria, Egypt
10.21608/edj.2016.92628
<span class="A7"><strong><span>Aims and Objectives: </span></strong></span><span class="A7"><span>The purpose of this <em>in vitro </em>study was to investigate the effect of polishing on the microleakage of five different Glass Ionomer restorative materials. </span></span>
<span class="A7"><strong><span>Materials and Methods: </span></strong></span><span class="A7"><span>Class V cavities were prepared at the labial surfaces of 50 freshly extracted primary anterior teeth. The prepared teeth were randomly divided into five groups and restored with Equia Fort, photac fil, Ketac molar, riva self cure and Fuji IX. each group was further subdivided into two subgroups (polished and not polished) of 5 teeth each. Finishing and polishing of the polished group was done using the Sof-Lex polishing system. Furthermore, all the restorations were subjected to dye penetration testing. </span></span>
<span class="A7"><strong><span>Results: </span></strong></span><span class="A7"><span>EQUIA specimens showed the least microleakage which was significantly better than the rest of groups. Maximum microleakage scores were observed in specimens of groups III and V (ketac molar and fuji IX). There was no significant difference between polished and non polished specimens of each group. </span></span>
<span class="A7"><strong><span>Conclusions: </span></strong></span><span class="A7"><span>Generally, resin modified glass ionomer cements produced more favorable results than conventional glass ionomer in terms of microleakage, with the exception of EQUIA, exhibiting excellent results. Also, polishing of glass ionomer restorations has no effect on marginal microleakage. </span></span>
Glass Ionomer,Microleakage,Resin Modified Glass ionomer
https://edj.journals.ekb.eg/article_92628.html
https://edj.journals.ekb.eg/article_92628_3215b4365f543aed66ee829be09ba320.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
COMPARATIVE STUDY OF THE MICROSHEAR BOND STRENGTH AND THE SOLUBILITY OF RESIN SEALER WITH AND WITHOUT THE ADDITION OF NANO SILVER
21
28
EN
Yousra
M.
Nashaat
Lecturer in Endodontics, Endodontic Department, Faculty of Dentistry October 6 University
Hadeel
A.
Sabry
Lecturer in Biomaterials, Biomaterials Department, Faculty of Dentistry October 6 University
Elham
I.
Elshaboury
Assistant Professor in Endodontics, Endodontic Department, Faculty of Dental Medicine, MSA University
10.21608/edj.2016.92629
<strong>Aim: </strong>To compare the micro shear bond strength and the solubility of resin sealer with and without the addition of Nano silver.
<strong>Materials and Methods: </strong>This study was carried out on 30 human freshly extracted upper first premolars. After preparation of tooth surfaces for microshear bond strength test, The prepared teeth were assigned to three groups 10 of each: Group A: AH Plus sealer was used, Group B: AH Plus sealer with 0.2% Nano silver incorporated to the already mixed sealer was used, group C: AH Plus sealer in addition to 0.5% Nano silver incorporated to the already mixed sealer was used. A shear load with tensile mode of force was applied via materials testing machine, Micro-shear bond strength was measured. For solubility test 30 PVC rings with 20 mm in internal diameter and 5 mm in thickness were placed onto a thin cellophane sheet supported by a glass plate and filled with sealers as follows: Group A, 10 rings filled with AH Plus sealer mixed according to the manufacturer’s instructions. Group B, 10 rings filled with AH Plus sealer mixed according to the manufacturer’s instructions, in addition to 0.2% Nano silver incorporated to the already mixed sealer. Group C, 10 rings filled with AH Plus sealer mixed according to the manufacturer’s instructions, in addition to 0.5% Nano silver has incorporated to the already mixed sealer. The samples were kept in an environment with temperature of 37˚C for up to three times the setting time of each sealer group. After that, the samples were removed from the rings. Each sample was weighed on precision scale and suspended through the nylon thread inside a large opening flask containing 50 ml of ultrapure water and all samples were maintained into the incubator at 37˚C for 7 days. Then the samples were placed into desiccators for 24 hours for new weighing. The difference between the first and the second weight represents the mass loss for each of the specimens.
<strong>Results: </strong>Group A showed the highest mean value of microshear bond strength among all groups. Group B showed a mean value of microshear bond strength, lower than Group A and there was a statistically significant difference between them, but was higher than that of Group C and there was no statistically significant difference between these two groups B and C. Group C showed the least mean value of microshear bond strength among all groups, it showed statistically significant difference with group A, and although it was also lower than Group B but there was no statistically significant difference between them. For solubility test group C showed the least mean value of solubility among all groups, it showed statistically significant difference with group A, and although it was also lower than Group B but there was no statistically significant difference between them.
<strong>Conclusion: </strong>The results of the present study showed that the incorporation of 0.2%& 0.5% nano silver particles to the already mixed AH plus sealer although decreased the microshear bond strength to dentin but it increased the resistance of the sealer to solubility..
AH Plus sealer,nano silver,Shear bond strength,endodontic sealer solubility
https://edj.journals.ekb.eg/article_92629.html
https://edj.journals.ekb.eg/article_92629_95272e28f401433b3216aeb69fd28373.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
MICROLEAKAGE OF DIFFERENT RESIN COMPOSITES OF CLASS II POSTERIOR RESTORATIONS PLACED AT THE CEMENTO-ENAMEL JUNCTION
29
36
EN
Hadeel
A.
Sabry
Lecturer of Biomaterials, Faculty of Dentistry, October 6 University
Ebaa
I
Al-Agha
Assistant Lecturer, Operative Dentistry, Faculty of Dentistry, October 6 University
10.21608/edj.2016.92630
<span class="A7"><strong><span>Aim of the study: </span></strong></span><span class="A7"><span>This study was directed to evaluate the microleakage of different types of composite resin in class II posterior restoration at the cement-enamel junction CEJ. </span></span>
<span class="A7"><strong><span>Materials and methods: </span></strong></span><span class="A7"><span>Eighty one freshly extracted molars were selected. The teeth were divided into three main groups (27 each) according to the material used. Group 1: samples were restored with packable resin composite. Group 2: samples were restored with packable resin composite lined with 1-1.5mm layer of flowable resin composite. Group 3: samples were restored with hybrid resin composite. Each group was divided into three subgroups (9 each) according to the storage time. Subgroup A, B and C: storage time was 24 hours, 1 month and 3 months respectively. The gingival margin was located at the CEJ. The teeth were restored and microleakage testing was performed using dye penetration method. The data were collected and statistically analyzed. </span></span>
<span class="A7"><strong><span>Results: </span></strong></span><span class="A7"><span>The packable composite group recorded the highest microleakage values followed by hybrid composite group then flowable-lined packable composite group and this was statistically with high significance (p<0.001). The three groups showed the least microleakage values after one month followed by three months storage while the highest values were after 24 hours storage. </span></span>
<span class="A7"><strong><span>Conclusion: </span></strong></span><span class="A7"><span>None of the tested materials was able to completely eliminate marginal microleakage at CEJ but the use of flowable resin composite as a liner under packable resin composite showed a reduction in microleakage compared to the other types. </span></span>
CEJ,class II restoration,packable composite,Flowable composite,hybrid composite,Microleakage,storage time
https://edj.journals.ekb.eg/article_92630.html
https://edj.journals.ekb.eg/article_92630_e71828a0ada09ab1e00a3bb603081d4a.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
BIOLOGICAL EFFECT OF ACRYLAMIDE ON PAROTID SALIVARY GLAND OF ALBINO RATS
37
45
EN
Rasha
H.
Al-Serwi
Oral Biology Department, Faculty of Dentistry, Mansoura University, Egypt
Mohamed
Mahmoud
Anees
Oral Medicine and Periodontology, Faculty of Dentistry, Mansoura University, Egypt
Aya
S.
Abd Elhamied
Veterinary at Medical Experimental Research Center (MERC), Mansoura University, Egypt
10.21608/edj.2016.92631
<strong>Introduction : </strong>Nutrition is a very important environmental factor that plays a crucial role in short and long-term health outcomes. Findings of acrylamide in many starchy foods have increased the interest in understanding its toxic mechanisms and risks upon human.
<strong>Objective : </strong>This study aimed to clarify the biological effects of acrylamide intake on parotid salivary gland in albino rats structurally and ultra-structurally.
<strong>Methodology: </strong>Twenty male Wistar albino rats were randomly allocated into test and control groups. Group I (control group), were taking saline vehicle (4 rats). Group II (test group), were taking acrylamide in dose of 15 mg/kg and divided into two subgroups (8 rats for each). The parotid salivary gland biopsy was taken according to the experimental periods (A: 15 days; B: 30 days). At the respective monitoring periods, the parotid gland was dissected and prepared for histological examination and evaluated by morphometry to record the histologic changes and electron microscopic analysis.
<strong>Results: </strong>Light microscopic studies revealed degeneration, fusion and loss of acinar cells outlines, scattered cellular remnants throughout the gland, pyknotic nuclei, varying sizes of cytoplasmic vacuoles in the acinar cells and destruction in the duct outlines with loss of its cell lining which increased by time. Electron microscopic analysis showed pyknotic nuclei with abnormal dilatation and degeneration of cytoplasmic organelles (golgi complex, rough endoplasmic reticulum and mitochondria), many clearly evident cytoplasmic vacuoles and considerable numbers of immature electron-lucent granules of different shapes and size were detected which decreased with prolonged acrylamide intake. Differences in normal nuclear count, circulatory factor of serous acini and inter-connective tissue space in between the acini in both test and control groups were statistically calculated and were found to be significant. Group comparison at different time periods revealed, significant differences between I & IIA, I & IIB and IIA & IIB for the tested parameters (P < 0.001).
<strong>Conclusions : </strong>On the basis of the obtained results, we concluded that acrylamide intake yielded structural / ultra-structural changes of parotid salivary gland and the effects were pronounced with prolonged intake. This might indicate risk of gland damage due to acrylamide intake.
https://edj.journals.ekb.eg/article_92631.html
https://edj.journals.ekb.eg/article_92631_57a80bc7d3141738405b8222b6555c7c.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
IMMUNOHISTOCHEMICAL LOCALIZATION OF TARTRATE RESISTANT ACID PHOSPHATASE (TRAP) IN DIVERSE ORAL TISSUES OF MICE AT DIFFERENT AGES
47
57
EN
Amira
E.
Fares
Lecturer, Oral Biology Department, Faculty of Oral and Dental Medicine, Cairo University
Iman
M.
Aboushady
Lecturer, Oral Biology Department, Faculty of Oral and Dental Medicine, Cairo University
10.21608/edj.2016.92632
<strong>Background: </strong>Tartrate-resistant acid phosphatase (TRAP) is considered to be a marker of the osteoclast and is also found to be critical for normal development of the skeleton.
<strong>Objectives: </strong>investigating the immunohistochemical distribution of TRAP in some oral tissues of mice at different age points.
<strong>Methods</strong>: Nine male mice from three different age groups (3 mice each) were used in the current study as follows: 1 day aged group, 1 week aged group and adult group. Animals of all groups were sacrificed and sections from skin side of lip, submandibular salivary gland, dorsal surface of tongue and enamel organ were prepared and subjected to histological and immunohistochemical examination to identify the differential expression of TRAP among these tissues.
<strong>Results</strong>: abundant immunohistochemical reaction to TRAP occurred in the granular convoluted tubules of the submandibular glands, in the hair follicles and sebaceous glands of the skin, in the surface layers of the dorsal surface of the tongue and among the different layers of the enamel organ. However, TRAP expression was more intense in the tissues of adult mice than that at earlier ages.
<strong>Conclusions</strong>: TRAP was intensely expressed in the oral tissues of adult mice rather than at earlier ages. These findings indicate that TRAP expression isn’t restricted to osteoclasts, and thus, TRAP may be involved in biological processes other than bone remodeling.
TRAP,Mice,submandibular glands,skin,Tongue,enamel organ
https://edj.journals.ekb.eg/article_92632.html
https://edj.journals.ekb.eg/article_92632_d20020dc3eb3f4f9071b1e408a2ee05c.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
MICROSONIC RETRIEVABILITY OF INTRACANAL SEPARATED ROTARY NICKEL-TITANIUM INSTRUMENTS HAVING ASYMMETRIC VERSUS SYMMETRIC DESIGNS AND EVALUATION OF REMAINING DENTIN THICKNESS USING CBCT
59
72
EN
Ghada
El-Hilaly
Eid
BDS, MSc, PhD, Associate Professor in Endodontics, Endodontic Department, Faculty of Oral and Dental Medicine, Cairo University, Egypt.
Reham
Mohammed Saeed
Seyam
BDS, MSc, PhD, Associate Professor in Endodontics, Endodontic Department, Faculty of Oral and Dental Medicine, Cairo University, Egypt.
10.21608/edj.2016.92634
<strong>Objective: </strong>This study compared retrievability of two rotary nickel Titanium (NiTi) instruments with symmetric versus asymmetric cross sections; ProTaper Universal® and RevoS®, respectively, with reference to the influence of some anatomic factors, as well as evaluated of the remaining minimum dentin thickness after retrieval using cone beam computed tomography (CBCT).
<strong>Materials and Methods</strong>: Thirty six extracted mandibular first molars with curved mesiobuccal canals were used. The apical 4mm of ProTaper Universal rotary NiTi instrument ® (Dentsply Maillefer, Ballaigues, Switzerland) size F3 (n=18) and RevoS rotary NiTi instrument ® (Micro- Mega, Besanc¸on, France) size A35/06 (n=18) were fractured in the apical region of the canal. Fragments were located at apical or apical-middle and their coronal end were before canal curvature, at or beyond it. Microsonic technique was successful when instrument retrieval occurred without mishaps. Post retrieval CBCT was superimposed on preoperative CBCT to determine changes in distal dentin thickness (at coronal end of instrument (C level) and at furcation level (F level) and in canal width. Chi-square test evaluated success incidence between the two instruments types and effects of influencing anatomic factors. Mann-Whitney U test compared quantitative data, significance was set at <em>P<0.05. </em>
<strong>Results</strong>: Overall success rate for removal of fractured fragments was 72.2% with equal incidence in both instruments types. Retrieval of ProTaper instrument was positively affected by being in the apical-middle location, <em>P=0.047. </em>Retrieval of RevoS instrument was positively affected by being before and at the curvature; <em>P </em>= 0.04. CBCT measurements showed overall minimum distal dentin thickness after retrieval to be approximately 0.67±0.14 mm. Percent of dentin removal was significantly higher at <em>F level</em>, <em>P=0.04, </em>while Canal width was higher at <em>C level P=0.052. </em>In ProTaper group, percent of dentin removal at <em>C level </em>was slightly lower than in RevoS group, <em>P=0.28</em>. Strip perforation occurred in 8 samples and secondary fracture in 2 samples.\
<strong>Conclusions: </strong>The successful removal of fractured Ni-Ti instruments is more influenced by anatomical factors namely; the position of the instrument within the root canal, the location of the fractured instrument in relation to the root canal curvature and the remaining dentin thickness. Instrument’s design indirectly affects success by requiring greater amount of dentin removal to disengage it.
Microsonic instrument removal,rotary NiTi instrument design,separated instruments,CBCT
https://edj.journals.ekb.eg/article_92634.html
https://edj.journals.ekb.eg/article_92634_a73b6fc034108230adde8862cd003136.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
SURFACE CHARACTERIZATION OF COMMERCIALLY PURE TITANIUM AND TITANIUM ALLOY AFTER MECHANICAL STRESSES AND FLUORIDE APPLICATION
73
87
EN
Dalia
I
El-Korashy
Associate Professor, Biomaterials Department, Faculty of Dentistry, Ain-Shams University, Cairo, Egypt
Mohammed
S
Nassif
Associate Professor, Biomaterials Department, Faculty of Dentistry, Ain-Shams University, Cairo, Egypt
10.21608/edj.2016.92635
<strong>Objectives: </strong>To characterize topographically and chemically, the surface of commercially pure titanium (CpTi) and titanium aluminum vanadium (Ti-6Al-4V) alloy after mechanical stresses, fluoride application and their combined effect.
<strong>Methods: </strong>CpTi and Ti-6Al-4V alloy cylinders 6mm in diameter and 8 mm in length were used in this study. The specimens were grouped according to the treatment applied into 5 experimental groups; group I included the as-received cylinders; group II included specimens that were immersed in artificial saliva for 28 days; in group III, specimens were subjected to 50,000 cycles of 100N axial loading under compression while immersed in artificial saliva; group IV included specimens that were immersed in artificial saliva containing 1500 ppm sodium fluoride for 28 days and in group V, specimens were subjected to 50,000 cycles of 100N axial loading under compression while immersed in artificial saliva containing 1500 ppm sodium fluoride. Surface topography was evaluated using atomic force microscope (AFM), scanning electron microscope (SEM) and chemical changes were assessed using Energy-Dispersive X-ray Spectroscopy (EDX).
<strong>Results: </strong>AFM results showed increased mean roughness (Ra) of both CpTi and Ti-6Al-4V alloy after exposure to fluoride as well as combination of mechanical stresses and fluoride. SEM evaluation showed alteration in surface topography of both groups showing deposits, cracks and concavities. EDX analysis for both groups revealed the presence of Ca, P, Na and F together with Ti for CpTi or Ti, Al, V for titanium alloy suggesting the formation of sodium and fluoride complexes with titanium, in addition to Ca/P deposits.
<strong>Conclusions: </strong>Fluoride application as well as combination of mechanical stresses and fluoride application can induce surface chemical and topographical changes which may have an impact on corrosion behavior of CpTi and Ti-6Al-4V alloy
https://edj.journals.ekb.eg/article_92635.html
https://edj.journals.ekb.eg/article_92635_e5b5002c61c5a2b001573c91fde6f0ce.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
DEGREE OF DENTINAL TUBULES OCCLUSION USING DIFFERENT OCCLUDING AND SEALING TECHNOLOGIES
89
98
EN
Dina
Wafik
Elkassas
Associate Professor, Conservative Dentistry Department, Operative Dentistry Division, Misr International University
10.21608/edj.2016.92636
<strong>Aim: </strong>the purpose of this study is to evaluate the effect of using nanohydroxyapatite, self assembly peptides, resin modified glass ionomer (RMGI) technologies on the degree of dentinal tubules occlusion in comparison to conventional applied sodium fluoride varnish.
<strong>Methods: </strong>Forty flat dentin specimens were prepared from sound human premolars. The specimens were immersed in 6% citric acid solution for 3min. Each dentin specimen was divided into two equal halves. One half acted as a control and the other received the treatment. The specimens were then divided into four equal groups according to desensitizing agent applied (n=10): GI: The nanohydroxyapatite based (Desensibilize NanoP, Brazil), GII: The self assemply peptide based (Curodont D’SenZ, Schweiz), GIII: RMGI based (VanishTMXT, USA), GIV: Sodium fluoride based (Durasheild, USA). The extent of dentinal tubules occlusion was assessed using environmental field emission scanning electron microscopy (EFESEM). EFESEM photomicrographs were captured from each half (Control and treated) after; 24 hours, 7 days and exposure to acidic challenge. EFESEM photomicrographs were imported into Image analysis software (NIH, USA) and percentage of dentinal tubules occluded areas was calculated. Data was analyzed using ANOVA test.
<strong>Results: </strong>The two ways ANOVA revealed that both desensitizing agents and time intervals and their interaction have a statistical significant effect on the degree of dentinal tubules occlusion. The groups after both 24 hours were ranked: GIII>GI=GII>GIV, after 7 days: GIII = GII > GI> GIV, and after the exposure to acidic challenge: GIII>GI>GII>GIV
<strong>Conclusion: </strong>The RMGI sealing technology showed a more promising effect on the degree of dentinal tubules occlusion compared to the innovative occluding technologies, based on the self assembly peptides, or conventional sodium fluoride varnish
<strong>Clinical relevance: </strong>The use of RMGI sealing technology can show immediate relief of dentin hypersensitivity owing to its immediate and lasting effect. Meanwhile the innovative occluding technologies based on the nanohydroxyapatite and self assembly peptides, need sometime to show a more profound effect. Nevertheless they are not recommended to patients with high citrus acid products consumption.
Dentin hypersensitivity,dentinal tubules occlusion,nanohydroxylapatite,self assembly peptides,Resin Modified Glass ionomer
https://edj.journals.ekb.eg/article_92636.html
https://edj.journals.ekb.eg/article_92636_239b38c83781fc97a67a3249b7bcbf58.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
CBCT AND SEM EVALUATION OF MARGINAL AND INTERNAL FIT OF LITHIUM DISILICATE COPINGS FABRICATED WITH 2 DIFFERENT TECHNIQUES (IN VITRO STUDY)
99
114
EN
Iman
El Aily
Lecturer Department of Fixed Prothodontics, Cairo University
Sahar
H
El Dessouky
Associate Professor Department of Oral Radiology, Cairo University
10.21608/edj.2016.92637
<strong>Statement of the problem. </strong>The marginal & internal adaptation of all-ceramic crowns may vary depending on the technique of fabrication and the methodology of measurement.
<strong>Purpose. </strong>To evaluate the marginal and internal adaptation of lithium disilicate crown copings fabricated with two techniques using two measuring modalities, cone beam computed tomography CBCT and scanning electron microscopy (SEM).
<strong>Materials and methods. </strong>The materials selected were Emax CAD for CEREC inlab (Group 1) and Emax Press for the lost wax and heat pressing (Group2). 10 copings were designated for each group. The copings were cemented on standardized epoxy resin dies with self-adhesive resin cement RelyX Uncem. A CBCT system was used to obtain measurements from reconstructed slices in two orthogonal planes for each sample, and a scanning electron microscope (SEM) was used for cross-sectioned samples. Mean, SD, median, range and 95% confidence level were calculated using Kolmogrov-Smirnov test and comparison of the ceramic types and methodology of testing were accomplished with Mann-Whitney U test and Spearman correlation tests respectively the significance level being set at P<0.05.
<strong>Results. </strong>Heat pressing exhibited lower vertical gap margin in SEM 22.7um (±5.3) than Emax CAD 47um (±16.1). The overall values of misfit of Emax CAD were significantly higher than Emax press in SEM & CBCT measurements. There was statistical correlation between the two measuring methods in both the mesial, lingual and total measurements according to Spearman correlation test.
<strong>Conclusion. </strong>The Emax press has a better overall marginal and internal fit than the Emax CAD, still the values are clinically acceptable for both.
https://edj.journals.ekb.eg/article_92637.html
https://edj.journals.ekb.eg/article_92637_03f9a78daef7609b81591899b37a6e42.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
SKELETAL PATTERN CLASSIFICATION IN DOWN’S SYNDROME PATIENTS: CLINICAL AND RADIOGRAPHIC STUDY
115
122
EN
Hazem
M.
Marzouk
Lecturer, Dept. of Oral & Maxillofacial Radiology, Faculty of Oral and Dental Medicine, Cairo Univ., Egypt – Assistant Professor, Dept. of Oral Medicine and Diagnostic Sciences, College of Dentistry, King Saud Univ., KSA
Wafa
M.
Al-Faleh
BDS, MSc, Associate professor, College of Dentistry, King Saud University, Saudi Arabia.
10.21608/edj.2016.92639
Down’s syndrome (DS) is a genetic disorder that results from a chromosomal abnormality due to trisomy of chromosome 21<strong>. </strong>Any disturbances during the early formation of the maxillofacial structures may lead to skeletal abnormalities. DS patients have been reported to experience malocclusions to a greater degree.
<strong>Objective </strong>of this study is to investigate the skeletal abnormalities among DS patients.
<strong>Subjects and Methods: </strong>The clinical examination and Cephalometric analysis were carried out for 30 DS patients and 30 control subjects. The prevalence of skeletal patterns were determined and compared to the findings of healthy controls.
<strong>Results: </strong>Based on Cephalometric analysis, the most common skeletal arch relationship in DS was the Class III skeletal arch relationship as it was found in 16 (53.3%) with vertical growth pattern tendency and a more obtuse mandibular angle. Clinically the most common occlusal arch relationship was the class III, which was found in 70% of the patients. Descriptive characteristics such as cross bites, open bites were frequently observed in the DS group. Anterior open bite, anterior cross bite and posterior cross bites were found in 46.7%, 30% and 53.3% of the DS patients respectively.
<strong>Conclusion</strong>: A significant difference is clear between DS subjects and controls when examining cephalometric radiographs regarding skeletal patterns as well as other clinical descriptive occlusal characteristics
Down’s syndrome,skeletal pattern,Cephalometric analysis
https://edj.journals.ekb.eg/article_92639.html
https://edj.journals.ekb.eg/article_92639_5307b0663d4e3818518beedea49bc5d2.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
EFFICACY OF POST LENGTH AND POST MATERIAL ON THE PULL-OUT BOND STRENGTH OF INDIVIDUALLY FORMABLE GLASS FIBER POST VERSUS CUSTOM MADE METAL POST ON ENDODONTICALLY TREATED MANDIBULAR PREMOLAR TEETH (AN IN VITRO STUDY)
123
128
EN
M.
Huwari
MDS, Faculty of Oral and Dental Medicine, Cairo University – Egypt
O.
El-Mahallawi
Professor, Fixed Prosthodontics Department, Faculty of Oral and Dental Medicine, Cairo University, Egypt
I.
El Alaily
Lecturer, Fixed Prosthodontics Department, Faculty of Oral and Dental Medicine, Cairo University, Egypt
10.21608/edj.2016.92640
<strong>Aim: </strong>Aim of the present study was to evaluate the efficacy of post length and post material on the pull-out bond strength of individually formable glass fiber post versus custom made metal post on endodontically treated mandibular premolar teeth.
<strong>Materials & Methods: </strong>Sixty-six extracted human mandibular premolars teeth were endodontically treated, they decoronated 2 mm above the cementoenamel junction and randomly divided into two main groups (Group A& B) based on the post materials to be used. Group A: individually formed glass FRC posts (everStick post), Group B: custom made metal post (Ni-Cr). Moreover, samples of each group were divided into 3 subgroups (subgroup 1, 2, 3) (n=22) according to the post length: subgroup I: 14.0 mm; subgroup II: 12.0 mm; subgroup III: 10.0 mm. All of the posts were luted with dual-polymerizing self-adhesive universal resin cement (RelyXUnicem). The samples were subjected to a pull-out bond strength test in a universal testing machine at a crosshead speed of 0.5 mm/min. The results, in newtons, were analyzed with two-way ANOVA and the pair wise Tukey post hoc test (α= .05). Two samples from each group were processed for digital microscope observations in order to investigate the mode of failure at the post/cement interface.
<strong>Results: </strong>Two-way ANOVA showed statistically non-significant difference (P>0.05) between cast metal post group (227.77± 42.40 N) and everStick post group (225.15± 23.65N). Moreover, post length with 14mm recorded the highest statistically significant difference (p<0.05) mean value (278.45± 33.81 N) followed by post length 12mm (241.37± 42.74 N) then post length 10mm recorded the lowest statistically significant difference (p<0.05) mean value (159.57± 17.53 N).
<strong>Conclusion: </strong>It can be concluded that the pull out bond strength (debonding force) is directly proportional to post length
EverStick post,Cast post,Post length,Pull out test
https://edj.journals.ekb.eg/article_92640.html
https://edj.journals.ekb.eg/article_92640_4eeb51357a58b9417bb036453c7d18f3.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
EVALUATION OF TRIDIMENTIONAL COMPUTED TOMOGRAPHY IN ASSESSMENT OF MANDIBULAR FRACTURE
129
135
EN
Iman
Dakhli
Lecturer of Oral and Maxillofacial Radiology, Faculty of Oral and Dental Medicine, Cairo University.
10.21608/edj.2016.92642
Aim: To demonstrate the validity of conventional CT and reconstructed 3DCT in assessment of mandibular fractures. A total of 14 mandibular fractures sustained by 10 patients were evaluated in the current work. All cases were males with ages ranging between 30-50 years. Patients were all assessed by 2DCT and reconstructed CT after compiling detailed history as well as thorough physical examination. The present study strengthens the role of the 3D-CT technique as a supplementary technique to the 2D-CT in the assessment of the mandibular fractures. 3DCT imaging has proved its validity as an exquisite tool in providing higher sensitivity in anatomic localization of mandibular fractures, in detecting comminution and bone displacement.
https://edj.journals.ekb.eg/article_92642.html
https://edj.journals.ekb.eg/article_92642_924b8bf88cff7778fec20724cb08039f.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
EFFECT OF L-CARNITINE ON THE LINGUAL MUCOSA OF STREPTOZOTOCIN-INDUCED DIABETIC ALBINO RATS
137
144
EN
Laila
E
Amin
Oral Biology Department, Faculty of Dentistry, Mansoura University
aminlaila81@gmail.com
Mohamed
A
Abou El Enin
Physiology Department, Faculty of Medicine, Mansoura University
Sally
H
Abou Baker
Oral Biology Department, Faculty of Dentistry, Mansoura University
10.21608/edj.2016.92643
<strong>Background: </strong>Diabetes mellitus (DM) is a significant healthcare problem concern worldwide that has different pathological effects on the body tissues and organs. A number of oral soft tissue abnormalities have been associated with DM by various reports. L-carnitine (LC) is an essential nutrient that is present in almost all animal species, microorganisms and plants.The scope of this study is two-fold: 1) to investigate degenerative changes in the epithelium of the diabetic rat tongue, and 2) to test the hypothesis that (LC) attenuates epithelial cell degeneration.
<strong>Materials and methods: </strong>Thirty adult male albino rats were divided into 3 equal groups: group I; (control group), group II; (diabetic group): diabetes was induced by a single intraperitoneal injection of streptozotocin in a dose of 35 mg/kg and group III; (LC) rats were treated as in diabetic group and injected intraperitoneally by (LC) at a dose of 300mg/kg b.w/day for 4 weeks. By the end of the experimental periods all animals were sacrificed and the tongue of all rats were dissected and processed for light and immunohistochemical examinations.
<strong>Results: </strong>Examination of dorsal surface of diabetic rats’ tongues revealed numerous filliform papillae with evidently disturbed orientation and inclination. Some of them appear notched; others were destructed with desquamation of its epithelial covering. Dorsal surface of rats’ tongues of (LC) group revealed almost normal direction, distribution and structure of the papillae and taste buds. Immunohistochemical examination of Ki67 expression of the control group showed significant decrease in Ki67 positive immunoreactivity, indicating less proliferative changes. While (LC) treated group revealed expression of Ki67, that statistically having no significant difference with control group
L,carnitine,diabetes,Tongue,lingual mucosa
https://edj.journals.ekb.eg/article_92643.html
https://edj.journals.ekb.eg/article_92643_0f642cdaa1323ffc8193c901f784c3aa.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
ORAL IMPACTS ON DAILY PERFORMANCES(OIDP) SCALE AMONG A GROUP OF EGYPTIAN CHILDREN IN MANSOURA CITY
145
151
EN
Salwa
M.
Awad
Assistant Professor of Pediatric Dentistry, Faculty of Dentistery, Mansoura University
Salwa
A.
Hegazy
Assistant Professor of Dental Public Health and Preventive Dentistry, Faculty of Dentistery, Mansoura University
10.21608/edj.2016.92645
<strong>Aim</strong>To assess the oral impacts on daily performances (OIDP), and their relationship to dental caries and gingival diseases in an Egyptian sample of Mansoura school children aged 8- 13 years divide into tow age groups.
<strong>Methods: A sample of 1200 children were selected on a cross sectional study</strong>. The sample was chosen through stratified random sampling within clusters . Children were individually interviewed using the Child-OIDP including the eight-item OIDP frequency scores , and then clinically examined to assess their normative treatment needs for dental caries, and periodontal disease .
<strong>Results</strong>: A total of 1184 (8-13years) were participated in this study. About 63.5% of children had oral impacts during the past 3 months. Child-OIDP scores (mean = 7.8± 4.9). Eating was the most reported performance, followed by cleaning teeth and maintaining emotional state in both age groups . Swelling and abscess was the most important perceived causes . Gingival diseases were of less concern in both age groups.
<strong>Conclusions</strong>: problematic eating and toothache were the most common impacts in Egyptian children. These results reflect needs for oral health promotion and treatment of dental caries.
oral health,quality of life,Egyptian children
https://edj.journals.ekb.eg/article_92645.html
https://edj.journals.ekb.eg/article_92645_35281ea000e98399c406bce5bd1a8749.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
THE EFFECT OF THREE ROOT CANAL SEALERS TO ROOT CANAL DENTIN WALLS
153
158
EN
Mohamed
B.
Eid
Lecturer, Endodontic Department, Faculty of Dentistry, Ahram Canadian University
Hassan
R.
Elsayed
Lecturer, Endodontic Department, Faculty of Dentistry, Almenia University
Medhat
M.
Kataia
Lecturer, Endodontic Department, Faculty of Dentistry, Almenia University
10.21608/edj.2016.92646
<strong>Aim: </strong>To compare push-out bond strength of gutta percha and three root canal sealers AH-Plus, MTA Fillapex, Gutta flow 2.
<strong>Materials & Methods: </strong>Sixty human freshly extracted lower premolars were prepared using nickel titanium Revo-S files till AS 40 finishing file and divided into three equal groups n=20, Group I: Gutta percha/AH-Plus sealer, Group II: Gutta percha/ MTA Fillapex, Group III: Gutta percha/Gutta flow 2. Each root was sectioned in a horizontal plane, from each root three sections with 2 mm in thickness were obtained at 1, 4, 9 mm from apex representing apical, middle, and coronal respectively. The push-out bond strength was determined for each root slice using universal testing machine. Data were analyzed using one-way ANOVA test.
<strong>Results</strong>: AH-Plus showed the highest bond strength while the Gutta flow 2 showed the lowest, there was no statistically significant difference between the three levels apical, middle & coronal.
<strong>Conclusions: </strong>The composition of endodontic sealers affects their push out bond strength, where the higher push out bond strength was found in GP/AH Plus group and the lowest in gutta flow 2, while there was insignificant difference in adhesion within the tested groups at different levels.
https://edj.journals.ekb.eg/article_92646.html
https://edj.journals.ekb.eg/article_92646_a7769726991e488b88039afae08f75e7.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
CBCT ANALYSIS OF ROOT CANAL PATTERN IN THE MESIOBUCCAL ROOT OF MAXILLARY FIRST AND SECOND MOLARS
159
168
EN
Omniya
Abu El-Dahab
Lecturer of Oral and Maxillofacial Radiology, Faculty of Oral and Dental Medicine, Cairo University, Egypt.
Ahmed
Saeid
Elkady
Endodontist, El- Sahel Teaching Hospital, Egypt
10.21608/edj.2016.92648
<strong>Aim: </strong>Analysis of root canal pattern in the mesiobuccal root of maxillary first and second molars using CBCT.
<strong>Methods: </strong>In this study fifty human extracted teeth with fully formed apices were selected (twenty five maxillary first molars and twenty five maxillary second molars). CBCT was used to evaluate the presence of the MB2 (mesiobuccal) root canal and the morphology of root canals in MB root (the type of root canal system).
<strong>Results: </strong>CBCT examination showed that out of 25 maxillary first permanent molar teeth studied, the mesiobuccal roots with a single canal were of type I (56%) or type III (4%) configuration. Those with two canals were of type II (24%) or type IV (16%) configuration. Regarding the maxillary second permanent molars the mesiobuccal roots were with a single canal of type I (64%) configuration. Those with two canals were of type II (12%), type IV (20%) or type VI (4%) configuration.
<strong>Conclusion: </strong>CBCT scans certainly show promise as a modality to facilitate the identification of root and canal configuration. The information gained about the tooth anatomy and canal morphology before treatment could potentially facilitate root canal therapy.
CBCT,mesiobuccal root canal,root canal pattern,maxillary first molar,maxillary second molar
https://edj.journals.ekb.eg/article_92648.html
https://edj.journals.ekb.eg/article_92648_3d9766c252a8767884fe7ae5170bfb57.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
IN VITRO COMPARATIVE STUDY OF MODULUS OF ELASTICITY BETWEEN DENTINE SUBSTITUTE AND FLOWABLE COMPOSITE RESIN
169
176
EN
Doaa
Helmy
Demonestrator of Operative Dentistry, Faculty of Dentistry, Pharos University
Ibrahim
Lotfy
El Gayar
Professor of Operative Dentistry, Faculty of Dentistry, Alexandria University
Mona
Ghoniem
Assistant Professor of Operative Dentistry, Faculty of Dentistry, Alexandria University
Maha
Adly
Assistant Professor of Dental Biomaterials, Faculty of Dentistry, Alexandria University
10.21608/edj.2016.92650
<strong>Objectives: </strong>This study will analyze the modulus of elasticity of novel smart dentine replacement (SDR) and a flowable composite resin when used as a base material under composite restoration.
<strong>Materials: </strong>1. Smart Dentine Replacement (SDR)
2. X-flow (flowable composite)
<strong>Methods: </strong>Forty eight specimens will be fabricated for elastic modulus test. The specimens will be divided into two groups, twenty four specimens of SDR and twenty four specimens of X-flow. Each group will be further divided according to the aging condition into three subgroups, each subgroup contain eight specimens. In which modulus of elasticity will be measured after 24 hrs and then measured after storage in distilled water for one month then measured after storage in distilled water for three months. Then the data will be statistically analysed.
<strong>Results: </strong>Elastic modulus of both Surefil SDR and X-Flow increases with the increase in the storage period in distilled water.
<strong>Conclusion: </strong>SDR has higher elastic modulus than X-Flow.
https://edj.journals.ekb.eg/article_92650.html
https://edj.journals.ekb.eg/article_92650_4351d9e8398012bfac21978b438d8adf.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
THREE DIMENSIONAL ASSESSMENT OF THE PHARYNGEAL AIRWAY IN A SAMPLE OF EGYPTIAN CHILDREN WITH AND WITHOUT CLEFT LIP AND PALATE
177
183
EN
Ghadeer
M. I.
Al-Hout
Canditate, Masters Degree Programme, Orthodontic dept., Faculty of Dentistry, Suez Canal University
Abbadi
A .
El-kadi
Professor, Orthodontic dept. Faculty of Dentistry, Suez Canal University
Sherif
S.
Morcos
Lecturer, Orthodontic dept., Faculty of Dentistry, Suez Canal University.
10.21608/edj.2016.92652
<strong>Objective: </strong>to compare the pharyngeal airway dimensions among cleft lip and palate patients and non-cleft lip and palate patients by using Cone-beam computed tomography (CBCT).
<strong>Material and methods: </strong>The sample included 60 cone-beam computed tomography (CBCT) of patients both males and females with age range 8-12 years, 30 patients with cleft lip and palate and 30 patients with non-cleft lip and palate. Measurements including Oropharnx linear measurment (width and depth), Nasopharynx linear measurment (width and depth) and Volumetric analysis( oropharynx and nasopharynx<strong>) </strong>were made digitally on 3-dimensional based dental software (In Vivo Dental, Anatomage, San Jose, CA, USA).
<strong>Results: </strong>For all cases including males and females, results showed statistically significant differences between control and cleft groups in oropharynx measurements (depth and volume) and in nasopharynx width.. 10 patient CBCT records in cleft and control groups were randomly selected and all measurements were repeated to test intraexaminer and interexaminer reliability respectively. For reliability evaluation results showed excellent agreement between measurements at two different time intervals.
<strong>Conclusion: </strong>Oropharyngeal airway space (depth-width and volume) and nasopharyngeal (width). significantly decreased in cleft than control patient.
CBCT,cleft lip,cleft palate,Oropharynx,Nasopharynx
https://edj.journals.ekb.eg/article_92652.html
https://edj.journals.ekb.eg/article_92652_928d97f6b8f82febbc78121f9dfbf01f.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
EFFECT OF 4% ARTICAINE INFILTRATION VERSUS 2% LIDOCAINE NERVE BLOCK AFTER PREMEDICATION BY IBUPROFEN ON ANESTHETIC EFFICACY IN ENDODONTIC TREATMENT OF ACUTE IRREVERSIBLE PULPITIS: A RANDOMIZED CLINICAL TRIAL (PART I)
185
192
EN
Ahmed
Yaser
Abu Bakr
B.D.S, Master degree student, Department of Endodontics, Faculty of Oral and Dental Medicine, Cairo University, Egypt
Ghada
ELHilaly
Eid
Associate Professor of Endodontics, Department of Endodontics, Faculty of Oral and Dental Medicine, Cairo University, Egypt
Geraldin
Mohamed
Ahmed
Associate Professor of Endodontics, Department of Endodontics, Faculty of Oral and Dental Medicine, Cairo University, Egypt
10.21608/edj.2016.92654
<strong>Introduction</strong>: The purpose of the present study was to assess effect of 4% articaine infiltration versus 2% lidocaine nerve block after premedication by ibuprofen on anesthetic efficacy in endodontic treatment of first permanent molar with acute irreversible pulpitis, in a randomized, single-blind study.
<strong>Subjects and Methods</strong>: Fifty two patients were included in the study with 26 patients in lidocaine group and 26 patients in articaine group. Patients were given one 600 mg tablet of ibuprofen as a premedication one hour before anesthetic administration. Electric pulp tester reading was recorded before and after anesthesia. Then root canal treatment was done in single visit. Patient rated pain on Visual Analogue Scale (VAS) preoperatively, during access cavity, cleaning and shaping and postoperatively after 6, 12 and 24 hours. Number of analgesic tablets taken was recorded. Chi square test was used to compare between categorical data.
<strong>Results</strong>: There was no statistically significant difference in percent of successful cases between lidocaine (53.8%, 76.9%) and articaine groups (50%, 57.7%) in access and cleaning and shaping, respectively. There was no statistically significant difference in number of patients needed supplemental intrapulpal anesthesia. Most patients reported no or mild pain after 24 hours in both groups and only one tablet was taken when needed.
<strong>Conclusions: </strong>lidocaine inferior alveolar nerve block (IANB) is similar to articaine infiltration in mandibular molars with acute irreversible pulpitis, thus making infiltration with articaine a viable alternative to IANB. Furthermore, supplemental intrapulpal anesthesia proved to be an effective method in controlling pain and finalizing treatment successfully.
Articaine,Lidocaine,infiltration,nerve block,Pulpitis,Ibuprofen
https://edj.journals.ekb.eg/article_92654.html
https://edj.journals.ekb.eg/article_92654_2692182dc0e404b7da2a87bb5cbfa8e4.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
ESTIMATION OF SALIVARY LEVELS OF INTERLEUKINE-6 (IL-6) AND INTERLEUKINE-8 (IL-8) IN THE ORAL PRE-MALIGNANT AND MALIGNANT LESIONS
193
201
EN
M
Abdel-Fattah
Assistant lecturer, Oral Medicine, Oral Diagnosis and Periodontology Department, Faculty of Dentistry, MSA University, 6th October, Egypt.
K.
El Gaaly
Professor of Oral Medicine, Oral Diagnosis and Periodontology, Faculty of Oral and Dental Medicine, Cairo University, Egypt.
M.
Al-Refai
Professor of Oral Medicine, Oral Diagnosis and Periodontology Faculty of Oral and Dental Medicine Cairo University, Egypt.
D
Galwash
Ass. Prof. Oral Medicine and Periodontology. MSA University .
10.21608/edj.2016.92655
The present investigation was designed to evaluate salivary IL-8 and IL-6 levels in premalignant and OSCC patients, in order to verify the effectiveness of using them as diagnostic biomarkers for detection of OSCC and possibly early malignant transformation in premalignant lesions. This study utilized ELISA technique in order to assess the levels of IL-8 and IL-6 in whole unstimulated saliva. The ELISA system is cited as the most sensitive, well-established, and widely available protein-based testing platform for the detection of specific proteins in body fluids or tissue. The present study was carried out on 50 subjects where they were subdivided into 15 patients suffering from frank oral malignancy, 20 patients with oral premalignant lesions. Among the 20 patients, biopsy results enabled us to further subdivide the group into patients with dysplastic lesions and others with no dysplastic changes; 10 patients into each group. And 15 systemically healthy control. The control group was selected to match the premalignant and malignant groups regarding age and gender, with no oral mucosal lesions. The results showed that salivary IL-6 and IL-8 levels were higher in all the studied groups. Also the control group had the lowest level of IL-6 and IL-8 in the saliva. As for the OSCC group they showed the highest levels of IL-6 and IL-8 in the saliva when compared to both the OPL and the control groups, thus it could be concluded that salivary IL-6 and IL-8 might be a potential biomarker for the detection of OSCC. So, salivary IL-6 and IL-8 hold promise as biomarkers for OSCC. And also, analysis of cytokines as IL-6 and IL-8 in saliva may be one of predictive means to reflect the trend of malignant transformation of oral premalignant lesions
https://edj.journals.ekb.eg/article_92655.html
https://edj.journals.ekb.eg/article_92655_1eb40ce65785fe33c205a45a3118e0ac.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
MARGINAL BONE LEVEL EVALUATION OF IMPLANT SUPPORTED KENNEDY CLASS I PARTIAL OVERDENTURE USING TELESCOPIC CROWNS VERSUS ACETAL RESIN CLASPS DIRECT RETAINERS
203
209
EN
Ahmed
A.Elwahed
Youssef
Lecturer, Removable Prosthodontics,Faculty of oral and Dental Medicine,Future University
10.21608/edj.2016.92656
<strong>Objectives : </strong>This study was conducted to evaluate and compare marginal bone level for abutments of implant supported Kennedy class I partial overdenture using Telescopic Crowns versus acetal resin clasps direct retainers after 18 month of clinical use.
<strong>Materials & methods : </strong>Ten male partially edentulous patients (Kennedy class I) with the premolars are the last standing abutments were selected and all patients were rehabilitated with metallic partial denture supported by two osseointegrated implants one on each side of the lower arch positioned in the area of second molar and were randomly divided into two equal groups according to type of abutments retainers ,Group I; Patients were rehabilitated with Tooth Implant Supported partial overdenture with two telescopic crowns ,Group II; Patients were rehabilitated with Tooth Implant Supported partial overdenture with two Acetal Resin clasps direct retainer on each side. Evaluation by measuring marginal bone level for main abutments was made at the time of insertion, after 6 month ,after 12 month and last after 18 month using radiographic evaluation.
<strong>Results: </strong>partial overdentures retained by telescopic crowns showed significant increase in marginal bone loss as compared with Acetal resin clasps retainers.
<strong>Conclusion: </strong>using tooth implant partial overdentures retained by Acetal resin clasps shows better effect on supporting structure as compared by partial dentures with telescopic crowns retainers.
https://edj.journals.ekb.eg/article_92656.html
https://edj.journals.ekb.eg/article_92656_bbf44af7f21ee6de26b0d65a36c9439e.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
ODONTOMETRIC AND MORPHOLOGIC DISCREPANCY STUDY OF PRIMARY TEETH IN YEMENIS CHILDREN “A CROSS SECTIONAL STUDY”
211
213
EN
Hani
Al-Akhali
MSc in Pediatric Dentistry, Ass. Lecturer of Pediatric Dentistry Faculty of Dentistry, Thamar University - Yemen
Kamal El Din
M.
El- Mutayam
Professor of Pediatric Dentistry, Faculty of Oral and Dental Medicine, Cairo University
Adel
A.
El-Bardissy
Ass. Professor of Pediatric Dentistry, Faculty of Oral and Dental Medicine, Cairo University.
10.21608/edj.2016.92658
The aim of the study was To collect normative data of crown size of primary dentition in a group of Yemenis Children and Compare the results we were found to previous published data of other Arab populations.
<strong>Subjects and methods: </strong>A total number of two hundred Yemeni children were included in this study, 100 males and 100 females, their ages ranged from 3-7 years old. Upper and lower impressions were taken. Each impression was poured immediately in stone plaster. A full set of primary teeth (incisors, canines, first and second molars) on both sides of the maxillary and mandibular dental arches were measured in Mesiodistal (MD) dimension.
<strong>Results: </strong>No statistically significant difference in the mean mesiodistal tooth width between the mesiodistal crown size obtained in the present study with those reported by other authors who studied other Arab populations.
<strong>Conclusions: </strong>The present values were numerically greater than, but close to the values obtained in Egyptian children<strong><em>, </em></strong>where all deciduous teeth were also evaluated. In Jordanian population that revealed largest mesiodistal value in comparison to the Egyptian and our study of Yemenis children.
Odontometric,Mesiodistal,primary teeth,Yemenis Children
https://edj.journals.ekb.eg/article_92658.html
https://edj.journals.ekb.eg/article_92658_009b2273818fcda5e794735ef59a7bbd.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
CLINICAL AND RADIOGRAPHIC EVALUATION OF SOFT-LINER ATTACHMENT FOR BAR/IMPLANT RETAINED MAXILLARY OVERDENTURES. A ONE YEAR PROSPECTIVE STUDY
215
224
EN
Dina
Bahgat
El Talawy
Lecturer, Department of Removable Prosthodontics, College of Oral and Dental Surgery, Misr University For Science and Technology, Egypt.
10.21608/edj.2016.92659
<span class="A7"><strong><span>Aim of the study: </span></strong></span><span class="A7"><span>This study aimed to evaluate clinical and radiographic outcome of soft-liner attachment for bar/implant retained maxillary overdentures after one year. </span></span>
<span class="A7"><strong><span>Materials and methods: </span></strong></span><span class="A7"><span>Six completely edentulous patients (3 males and 3 females) complained from lack of stability and insufficient retention of their maxillary dentures received 4 implants in the anterior part of the maxilla (2 at canine areas and 2 at 2nd premolar areas) using the standardized two-stage submerged surgical protocol. Six months after surgery, implants were connected with a resilient bar with 2 short distal cantilevers of 7mm length. The fitting surfaces of maxillary dentures were lined with auto polymerized addition silicone resilient liner which is used as a female housing over the bar using closed mouth technique. Plaque Index (PI), Bleeding Index (BI), and Gingival Index (GI), Probing depth (PD), Implant stability (ISQ) and Marginal bone loss (MBL) were evaluated at time of overdenture insertion T0, 6 months after overdenture insertion (T6) and 12 months after overdenture insertion (T12). </span></span>
<span class="A7"><strong><span>Results: </span></strong></span><span class="A7"><span>None of the implants failed after one year follow-up resulted in 100% survival rate. There was no significant difference in PI, GI, BI between observation times. Both PD and MBL increased significantly with time. ISQ decreased significantly at T6 and increased again at T12. There was a significant positive correlation between MBL and PD only. </span></span>
<span class="A7"><strong><span>Conclusion: </span></strong></span><span class="A7"><span>Soft liner attachments for cantilevered bar-implant retained maxillary overdentures are associated with good peri-implant soft tissue health, good implant stability and minimal marginal bone loss after one year. </span></span>
Soft-liner attachment,bar,maxillary,Implant overdenture
https://edj.journals.ekb.eg/article_92659.html
https://edj.journals.ekb.eg/article_92659_14754d78f7a056eceaa7d4bdc48fcf1d.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
PREVALENCE OF MALOCCLUSION IN PRIMARY SCHOOLCHILDREN OF CAIRO, EGYPT (A SURVEY STUDY )
225
231
EN
Mohummed
Saif Soliman
Fsifis
B.D.S Cairo University, Master Degree of Orthodontics, Cairo University
Fatma
Abdou Abd
El-Sayed
Professor of Orthodontics, Faculty of Oral and Dental Medicine, Cairo University
Hala
Munir
Professor of Orthodontics, Faculty of Oral and Dental Medicine, Cairo University
10.21608/edj.2016.92661
This project was aimed to determine the prevalence of malocclusion among school children in Cairo governorates.
<strong>Materials and Methods: </strong>This study was carried out in Cairo governorate where a list of the primary schools and the number of primary school children in Cairo governorate were obtained from the database of the Ministry of Education. Cairo governorate was divided into four regions according to geographical location, two and sometimes three schools were chosen randomly from each region using SAS computer software thus, 20 schools were included in this study and a total number of 1936 schoolchildren were included in this survey.
<strong>Results: </strong>Distribution of Angle classification: this study showed that 497 children (25.7%) had accepted occlusion while, 997 children had Angle Class I malocclusion representing (51.5%) of the study sample, 318 children had Angle Class II malocclusion representing (16.4%) of the study sample while 115 children had Class III malocclusion representing (5.9%) of the study sample and 9 children had Class IV representing (0.5%) of the study sample. Overjet: The most frequent category was normal overjet (>0–3.5mm) which was found to be (71.8%). Anterior open bite (<0 mm) was found in (5.9%) of the total sample.
<strong>Conclusion: </strong>Compared to previous Egyptian studies, there was a tendency toward decrease in the prevalence of accepted occlusion while, there was an increase in Angle Class II and III malocclusion.
https://edj.journals.ekb.eg/article_92661.html
https://edj.journals.ekb.eg/article_92661_37ff1cd75fb29e5278982c264f021ed2.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
ODONTOGENIC MYXOMA VERSUS SOFT TISSUE MYXOMA: IMMUNOHISTOCHEMICAL STUDY
233
238
EN
Shymaa
Ahmed
Hamza
Department of Oral and Maxillofacial Pathology, Faculty of Oral and Dental Medicine, Cairo University
Samia
Mostafa
El-Azab
Department of Oral and Maxillofacial Pathology, Faculty of Oral and Dental Medicine, Cairo University
Safa
Fathy
Abd El-Ghani
Department of Oral and Maxillofacial Pathology, Faculty of Oral and Dental Medicine, Cairo University
10.21608/edj.2016.92662
<strong>Background: </strong>Odontogenic Myxoma (OM) and Soft Tissue Myxoma (STM) are two myxoid tumors that may arise in the oral cavity. They often present a diagnostic and treatment challenge because of the histological overlap at the light microscopial level. Our study aimed at understanding their origin and biological behavior through comparing the immunohistochemical expression level of the neural stem cell marker; Nestin (N), as well as the invasion marker; Matrix Metalloprotienase 9 (MMP-9).
<strong>Methods: </strong>The N and MMP-9 expression area percent, were measured and calculated in a total of 16 Myxoma specimens, where 9 cases of OM and 7 cases of STM were examined.
<strong>Results: </strong>N and MMP-9 were positively expressed in both OM and STM showing maily cytoplasmic immunostaing, where higher expression level in OM was found; using both markers.
<strong>Conclusions: </strong>Finally, our results were able to suggest the common origin for OM and STM to be the odontogenic ectomesenchyme which is derived from neural crest cells. We propose that STM might be considered the peripheral entity of OM. Moreover, OM is less differentiated and more aggressive than STM.
nestin,MMP-9,Odontogenic Myxoma,Soft Tissue Myxoma
https://edj.journals.ekb.eg/article_92662.html
https://edj.journals.ekb.eg/article_92662_4c876bbfe5b200e79970eb14e131696c.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
PREDICTION OF ROTARY FILES LIFE SPAN USING FOUR METHODS
239
245
EN
Yasser
F
Gomaa
Assistant Professor, Dental Materials Department, Faculty of Dentistry, Minia University, Egypt
Magdy
Mohamad
Ali
Assistant Professor, Endodontics Department, Faculty of Dentistry, Minia University, Egypt
10.21608/edj.2016.92664
This study was designed to find a suitable method for estimating and predicting the average life span of rotary files after simulated clinical use.
<strong>Materials and methods: </strong>We used One Shape rotary file system. A total of 120 mesiobuccal root canals from lower 1st molars were used with medium curvatures in the range of 20-40 degrees. All canals were prepared at torque of 4N/cm<sup>2 </sup>and 350 rpm. Files were subjected to autoclaving after preparing each 3 canals. Files were evaluated for deformation by four methods; magnifying loupe, DOM, SEM and atomic force microscope at the base line, after preparing 3,6,9 and12 canals. Scores were recorded. We used a modified form of the classification of Chekka et al to evaluate the deformation of files.
<strong>Results</strong>: Some of -as received- files showed some sort of deformation evidenced by M.L and DOM and this was doubled when evaluated using SEM or AFM. All files developed more deformation after preparing more canals. The score of deformation ranged between 1-67%. No files exhibited fracture before preparing 9 canals. The score of deformation was in direct relation to the number of prepared canals. The significant differences in the tools of evaluation were not significant until preparing nine canals.
<strong>Conclusion </strong>the results reflect the importance of the loupe in detecting major deformations and the DOM in detecting the minor deformations. It also gives a notation about the importance of regular check up of the files after use and using visual aids specially ones with high magnification powers as the DOM. There were significant difference of the results of the evaluation methods after preparing nine canals with atomic force microscope the first detection method followed by SEM, DOM and finally M L the implication of this finding is M.L. and DOM are satisfactory clinical means of evaluation of the files and stating the time of discarding.
https://edj.journals.ekb.eg/article_92664.html
https://edj.journals.ekb.eg/article_92664_82433631b79cd5c7b0198ce8218043d1.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
IMMUNOHISTOCHEMICAL EXPRESSION OF ΔNP63 IN ORAL CARCINOMA IN SITU AND ORAL SQUAMOUS CELL CARCINOMA IN COMPARISON WITH NORMAL ORAL EPITHELIUM.
247
250
EN
Ayed
Dahan
B.D.S , M.D.S, Ministry of Public Health,Yemen
Naglaa
Al-Hossary
Professor of Oral Pathology, Faculty of Oral and Dental Medicine, Cairo University
Dalia
Hussein
El-Rouby
Professor and Head of Oral Pathology Department, Faculty of Oral and Dental Medicine Cairo University
10.21608/edj.2016.92665
ΔNp63 exerts dominant-negative activities against TAp63 and p53, and ΔNp63 is thus considered as an oncoprotein. The majority of the initial alterations of precancerous and cancerous oral lesions are not readily recognizable, on clinical or histopathological examination. The basic biology of initiation and progression of these tumors is still obscure<strong>. </strong>So the objective of this study is to evaluate the expression of ΔNP63 among normal oral epithelium, oral carcinoma in situ and OSCC using an immunohistochemical approach.
<strong>Material and methods</strong>: A total of 78 archival paraffin embedded specimens (26 normal oral epithelium, 26 oral carcinoma in situ and 26 OSCC) will be collected. The mean ΔNP63 will be evaluated by immunohistochemical staining, (P < 0.05) was considered statistically significant.
<strong>RESULTS: </strong>ΔNp63 the greatest mean area of immunoexpression was recorded in the poorly differentiated OSCC, whereas the least value was recorded in normal mucosa. (ANOVA) test revealed that the difference was extremely statistically significant (P<0.0001).
<strong>CONCLUSION: </strong>The intensity of positive immunoreaction gradually increased with progression of OSCC.
https://edj.journals.ekb.eg/article_92665.html
https://edj.journals.ekb.eg/article_92665_c70b58133392db6bce00c7f489c952e1.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
DYE EXTRACTION METHOD EVALUATION OF THE SEALING ABILITY OF THREE TYPES OF ENDODONTIC SEALERS
251
256
EN
Engy
M
Kataia
Researcher in restorative and dental materials department, National Research Center, Cairo, Egypt
Mohamed
M
Kataia
Lecturer in Endodontic department, EL Minia University, Egypt
10.21608/edj.2016.92668
<strong>This study aimed to: </strong>evaluate the sealing ability of AH Plus sealer, IRoot SP sealer, and Epiphany-Resilon root canal filling system by Dye extraction method.
<strong>Methods: </strong>45 freshly extracted single rooted human teeth were instrumented with Revo-S; the sequence used was SC1, SC2, SU, AS30, AS35, and AS40 taper 0.06. The prepared specimens were then divided randomly into Negative controls (n = 9) and Positive controls (n = 9); the negative controls were completely covered with three layers of varnish, and the positive controls were enlarged, but not root filled. The remaining 27 teeth were then randomly divided into three groups of 9 teeth each according to the type of sealer used, as the following: <strong>Group 1 </strong>(AH Plus sealer), <strong>Group 2 </strong>(IRoot SP sealer), and <strong>Group 3 </strong>(Epiphany-Resilon root canal filling system). Apical leakage evaluation was done by dye extraction methods. Data were statistically analyzed.
<strong>Results: </strong>The positive control showed total dye absorbance of 5000, while negative control samples had a low absorbance of 75. The mean absorbance values were 370, 315, and 400 for Group 1 (AH Plus), Group 2 (IRoot SP), and Group3 (Epiphany-Resilon root canal filling system) respectively.
<strong>Conclusion: </strong>The three tested sealers had the similar capability in apical sealing.
dye extraction,sealing ability,IRoot SP,Epiphany-Resilon
https://edj.journals.ekb.eg/article_92668.html
https://edj.journals.ekb.eg/article_92668_e0585829b2de514fc58540a15154294d.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
FRACTURE STRENGTH AND MICROLEAKAGE OF SIMULATED IMMATURE TEETH REINFORCED WITH FIBER POST: IN VITRO STUDY
257
267
EN
Mohamed
S
Mohamed
Candidate in Crown and Bridge Department, Faculty of Dentistry, Minia University
m.abdelrahman@tudent.edu.sa
Cherif
A
Mohsen
Prof. and Chairman of Crown and Bridge Department, Faculty of Dentistry, Minia University
Mohamed
M
Metwally
Lecturer of Crown and Bridge, Crown and Bridge Department, Faculty of Dentistry, Minia University
10.21608/edj.2016.92669
<strong>Aim of the study: </strong>This <em>in vitro </em>study was conducted to investigate the fracture strength and microleakage of simulated immature teeth reinforced with fiber post using two types of composite resin cement “ total etch and self etch “.
<strong>Materials and methods: </strong>Eighty freshly extracted maxillary central incisors were used in the study, they were divided into two groups (40 samples for each) according to the stage of root development (mature – immature), Then each group was subdivided into two subgroups (20 samples for each) according to the type of adhesive composite resin cement (RELY X TM U200 Automix) (3M ESPE Germany) self-adhesive and (Bifix QM) ( Voco. GERMANY) total etch , Each subgroup was further divided into two classes (10 samples for each) according to subjecting the samples to thermocycling or not , Finally 5 samples from each class were tested for fracture strength by using universal testing machine and the other 5 samples of each class were tested for microleakage by using digital microscope.
<strong>Results: </strong>The results of the fracture strength test showed that mature teeth showed higher fracture strength than simulated immature teeth. Total etch composite resin composite cement showed higher fracture strength than self etch cement. Finally the results showed that thermocycling affects negatively on fracture strength. As regard microleakage, the reults pointed out that no microleakage occurred in all tested groups.
<strong>Conclusions</strong>: Fracture strength of mature teeth is more than immature teeth, using total etch composite resin cement give more fracture strength than self etch composite resin cement, thermocycling affects negatively the fracture strength for mature or immature endodontically treated teeth, no microleakage occurred irrespective to the state of restored root (mature or immature).
Simulated immature,Total etch,self etch,Fiber post,Fracture strength,Microleakage
https://edj.journals.ekb.eg/article_92669.html
https://edj.journals.ekb.eg/article_92669_0571b3c68f2ef7dd7e39aa4feed6fbda.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
EVALUATION OF THE ACCURACY OF ABUTMENT LEVEL IMPRESSION IN “ALL ON FOUR” IMPLANT CASES
269
276
EN
Mohamed
Farouk
Abdalla
Lecturer Of Prosthodontics, Cairo University.
10.21608/edj.2016.92670
<strong>Objectives: </strong>A lack of parallelism among the implants, and that between the implants and the teeth is a common finding in clinical situations. The aim of the following study was to evaluate the accuracy of abutment level impression in “All On Four” cases.
<strong>Materials and methods: </strong>Five completely edentulous patients restored with “All On Four” distribution of implants in the lower arch were recruited in this study. Prior to restoration two impressions were made for each case. The first impression utilized a specific abutment level impression (recommended by the manufacturer) and poured into a stone cast; trans-mucosal abutments were then screwed onto the implant analogues. The second impression was in a form of a simple impression of the trans-mucosal abutments, and poured into a stone cast. This group was considered as the control group. Both casts were photographed and using the Digimizer<sup>® </sup>Software V. 4.3.1 linear measurements and surface areas were measured on the casts and compared.
<strong>Results: </strong>Using independent t-test, there was a significant difference between the linear measurements and surface areas measured on the casts produced by both impression techniques, where (P-value < 0.05).
<strong>Conclusion: </strong>In angulated implant cases (All On Four), the position of abutments on a cast produced by the abutment level impressions used showed statistically significant difference from the original abutments’ position in the patients’ mouth.
https://edj.journals.ekb.eg/article_92670.html
https://edj.journals.ekb.eg/article_92670_789040b9a07032304d62168ebfc76f23.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
EFFECT OF IMPLANT PLATFORM SWITCHING ON STRAIN DEVELOPED AROUND IMPLANTS WITH STRAIGHT AND ANGLED ABUTMENTS
277
284
EN
Mohamed
A.
Elsadek
Demonstrator, Fixed prosthodontics department, Faculty of Oral and Dental Medicine, Cairo University, Egypt.
Hesham
A.
Katamesh
Professor of Fixed Prosthodontics, Faculty of Oral and Dental Medicine, Cairo University, Egypt
Hanaa
I.
Sallam
Assistant Professor of Fixed Prosthodontics, Faculty of Oral and Dental Medicine, Cairo University, Egypt
10.21608/edj.2016.92672
<strong>Statement of the problem. </strong>Implant placement in an ideal position where stresses are transmitted vertically along the long axis of the implant rarely if ever coincides with the most esthetically pleasing position dictated by prosthetic planning. This situation could be dealt with by placing the implant at an angle in the most favourable position surgically and using angled abutments to compensate for the deviation from the previously planned prosthetic site of the final restoration. This may lead to excessive stresses on the inclined side of the implant which could cause bone resorption.
<strong>Purpose. </strong>The aim of this study was to evaluate the effect of implant platform switching on strain developed around implants with straight and angled abutments.
<strong>Materials and Methods. </strong>Twenty root-form titanium implants were inserted in epoxy resin blocks. According to the direction of implant insertion in the epoxy resin block, the twenty implants were divided into two main groups: <strong>Group I: (n=10) </strong>Straight implants with straight abutments. <strong>Group II :( n=10) </strong>Inclined implants with angled abutments (15 degrees). Each group was sub-divided into two sub-groups according to the abutment diameter in relation to the implant diameter: <strong>Sub-group A :( n=5) </strong>4.5 mm diameter Implants received 4.5 mm diameter abutments. <strong>Sub-group B:(n=5) </strong>4.5 mm diameter Implants received smaller 3.75 mm diameter abutments (platform switching). The 20 implant abutments received Ni-Cr full metal crowns. The blocks were trimmed to 1mm thickness around the implant then each sample received four strain gauges to represent the mesial, distal, buccal and lingual surfaces around the implant. A computerized universal testing machine was used for loading the implants by 300N, at a rate of 1 N/Sec. The load was applied progressively starting from zero to 300 N during which readings from the strain meter were recorded on the computer.
<strong>Results. </strong>It was found that <strong>Group II </strong>(Angled abutments) with matching diameter <strong>Sub-group A </strong>showed statistically significantly (P ≤ 0.05) highest mean micro-strains (435.1± 215.7) followed by <strong>Group I </strong>(Straight abutment) with matching diameter <strong>Sub-group A </strong>(346.2 ± 175.3) followed
by <strong>Group II </strong>(Angled abutments) with platform switching <strong>Sub-group B </strong>(307.1 ± 135.0). <strong>Group I </strong>(Straight abutment) with platform switching <strong>Sub-group B </strong>showed statistically significantly lowest mean micro-strains (239.0± 165.4) .
<strong>Conclusions. </strong>Straight implants with straight platform-switched abutments were associated with the least micro-strain values.
Implants,platform-switching,angled abutments,Implant supported crowns,crestal bone resorption,Strain
https://edj.journals.ekb.eg/article_92672.html
https://edj.journals.ekb.eg/article_92672_6a2527686e8fea1e59122561e4f3b966.pdf
The Egyptian Dental Association (EDA)
Egyptian Dental Journal
0070-9484
2090-2360
62
Issue 1 - January (Part 1)
2016
01
01
EFFICACY OF INTRACORONAL BLEACHING USING NON THERMAL ATMOSPHERIC PRESSURE PLASMA AND ITS EFFECT ON PULP CHAMBER DENTIN. AN INVITRO STUDY
285
294
EN
Heba
Abdel Hamid
MSc. in Dental Materials Science, Faculty of Oral and Dental Medicine, Cairo University.
Gihan
Aly
Abdel Rahman
Professor of Dental Materials Science, Faculty of Oral and Dental Medicine, Cairo University
Taheya
Ahmed
Moussa
Professor of Dental Materials Science, Faculty of Oral and Dental Medicine, Cairo University
taheya.m@hotmail.com
Farouk
Fahmy
Elakshar
Professor of Physics, Faculty of science, Al-Azhar University
10.21608/edj.2016.92673
<strong>Aim: </strong>The aim of this study was to evaluate the efficacy of intracoronal bleaching using non thermal atmospheric pressure plasma and its effect on pulp chamber dentin structure.
<strong>Materials and methods: </strong>Two types of commercially available hydrogen peroxide bleaching systems were used in this study with a concentration of 32% (White smile GmbH). Thirty eight single rooted premolars were collected. The teeth were sectioned in half longitudinally in a mesio-distal direction and specimens were prepared according to the testing method used. Specimens were stained with a prepared standardized coffee solution. The sectioned teeth were divided into four groups according to the type of bleaching protocol used. Color measurements were done by a spectrophotometer before bleaching, one day and one week after bleaching for all the experimental groups. Universal Testing Machine with cross head speed of 1 mm/min was used for measuring microshear bond strength of the four investigated groups before and after bleaching. Data were analyzed statistically by: Duncan Multiple range test for means comparison and Paired t test for evaluating the effect of time and intervals on different parameters within each bleaching protocol. The significance level was set at P ≤ 0.05.
<strong>Results: </strong>The results showed different findings among the bleached groups when evaluated after 1 day and 7 days. It was found that non thermal atmospheric plasma has a stronger bleaching effect than LED light when used as an activating method. Furthermore, the light bleached group showed a significant decrease in the microshear bond strength values after bleaching. While, there was no statistically significant difference in microshear bond strength values of the other three groups.
<strong>Conclusion: </strong>The application of non thermal atmospheric pressure plasma is a promising method for intracoronal bleaching.
Intracoronal bleaching,non-thermal atmospheric pressure plasma,Hydrogen Peroxide
https://edj.journals.ekb.eg/article_92673.html
https://edj.journals.ekb.eg/article_92673_1cdb78b37f606b677df564ee2c06b832.pdf