2024-03-29T10:49:19Z
https://edj.journals.ekb.eg/?_action=export&rf=summon&issue=14386
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
CLINICAL AND RADIOGRAPHIC EVALUATION OF HEALING EFFECT OF LOW LEVEL LASER THERAPY ON CHRONIC APICAL LESIONS
Latifa
Abdelgawad
Laila
Kenawi
Objective: This study evaluated clinically and radiographically, the healing in chronic apical lesions using low level laser therapy (LLLT).
Methods: Twenty female patients between the ages of 20 and 30 years with chronic apical lesions in anterior maxillary teeth diagnosed on the basis of their clinical signs and symptoms and radiographic findings were included in the study. The patients were randomly divided into two main groups according to treatment plan: group I; received conventional endodontic treatment only, group II; received conventional endodontic treatment and then LLLT was used. The low level laser was applied for 120 seconds in the session for three sessions in week for four weeks and the selected parameters were (200 mw, 810 nm, CW). The healing was evaluated clinically, radiographically. Clinically to record pain, swelling, or any other adverse event that occur after treatment for one week. Radiographically to evaluate bone density and area of periapical lesions using cone beam computed tomography (CBCT) and image fusion. Images were obtained immediate after obturation and after the three follow up periods (1, 3 and 12 month) .
Results: clinical signs and symptoms decreased in the lased group faster than conventional group. Pain reduction in the laser group was more effective than the conventional group without significant difference. Bone density analysis showed that Laser had significantly higher bone density after 1 ,3 and 12 month evaluation periods compared to control group (P<0.05). Comparing the area values of control and laser groups, a significant difference was found throughout the three evaluation periods compared to the area immediate after obturation.
Conclusions: Based on the results of this study; LLLT favored the healing process of apical lesions especially when combined with nonsurgical endodontic treatment. Image fusion and CBCT can provide an accurate and reproducible method for assessment the healing of periapical lesions.
Low-level laser therapy
Bone healing, chronic apical lesions, cone beam computed tomography (CBCT)
2016
01
01
1039
1049
https://edj.journals.ekb.eg/article_95418_15bf2d90e96b009f2f90f2e95dc67053.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
IMMEDIATE VERSUS DELAYED LOADING FOR DENTAL IMPLANTS SUPPORTING MANDIBULAR OVER-DENTURES IN TYPE II DIABETIC PATIENTS
Mohamed
Hassanein
Emad
Agamy
The aim of this study is to evaluate the effect of immediate loading on dental implants supporting mandibular complete overdenture in controlled type II diabetic patients both clinically and radiographically. Fourteen completely edentulous males; controlled type II diabetic patients were selected for the study. Their HbA1c (Glycosylated Hemoglobin) level was around 7. All were examined with pre-operative CBCT (cone-beam computed tomography) to evaluate the future implant site, and for proper selection of implant size. First implant was installed in one side of the inter-foraminal region of the mandible, then after 4 months the second implant was installed in the other side. Two weeks later both implants were loaded by incorporation of O-ring attachments into the existing mandibular complete denture as a direct clinical procedure in the mouth. Both radiographic evaluation of crestal bone loss using CBCT, and clinical evaluation of implant stability using resonance frequency analysis (Osstell device) were made at time of loading, 3, 6, 12 and 24 months after loading. The results showed that after 24 months of loading no significant difference observed between the immediate and delayed loading protocols either clinically (Implant stability), or radiographically (Crestal bone loss). The only significant difference observed in the implant stability between both groups was at time of loading. In this study all clinical and radiographic results suggested that dental implants could be used as a successful and predictable treatment to retain mandibular complete overdentures in controlled type II diabetic patients with a very high success rate either immediately or delayed loaded.
immediate loading
delayed loading
overdenture
Diabetes mellitus
HbA1c
CBCT
resonance frequency analysis
2016
01
01
1051
1063
https://edj.journals.ekb.eg/article_95419_dfd1e85512d02b5f5b135d193752a4c3.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
IMPLANT STABILITY AND MARGINAL BONE LOSS IN MANDIBULAR IMPLANT RETAINED OVERDENTURE CASES: A COMPARATIVE STUDY USING TWO STUD ATTACHMENT SYSTEMS
Yasser
Araby
Emad
Agamy
The present study was designed to compare two stud attachment systems [Locator and Ball / O-Ring attachment] in mandibular overdenture cases retained by two implants in the inter-foraminal area. Twenty completely edentulous male patients received mandibular overdentures retained by two implants were randomly assigned into two groups; Group-I received Locator attachment while Group-II received Ball / O-Ring attachment. A comparison based on implant stability quotient [ISQ] was done using Resonance Frequency Analyzer [Osstell, ISQ] and another comparison was conducted based on the marginal bone loss using cone beam computed tomography [CBCT]. The patients were then scheduled for recall appointments up to two years follow up period starting from the loading time. The statistical analysis of the results reported no significant difference for the marginal bone loss & ISQ values between the two groups at all intervals except the third month implant stability results which showed a significant difference between the two groups with better stability results in the Locator attachment group (at p<0.05). Within the limits of the present study, it may be concluded that both studied attachment systems are successful and useful however the Locator attachment system shows superior initial stability results than the Ball attachments.
: Implant supported overdenture
Locator attachment
implant stability
resonance frequency analysis
marginal bone loss
Cone beam computed tomography
2016
01
01
1065
1073
https://edj.journals.ekb.eg/article_95420_6db5a6a0884b243ca7fc254a7fb4cef8.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
SHEAR BOND STRENGTH OF ORTHODONTIC BRACKETS BONDED WITH TOTAL ETCH ADHESIVE SYSTEMS CONTAINING SILVER NANOPARTICLES “AN IN VITRO STUDY”
Kareem
Hamdy
Mona
Riad
Amir
Hafez
Amany
Fekry
objective: This study was conducted to assess the shear bond strength of orthodontic brackets bonded with total etch adhesive systems containing silver nanoparticles (AgNPs) and interfacial analysis using Environmental Scanning Electron Microscope (ESEM).
materials and methods: The AgNPs was synthesized and characterized by (UV-Vis) spectroscopy and Transmission Electron Microscope (TEM). Adper Single Bond 2 was used as the total etch (TE) adhesive. 48 teeth were divided into 40 teeth for shear bond strength test and 8 teeth for ultra- morphologic examination. For shear bond strength test 40 teeth were randomly divided into two equal groups according to the addition of silver nanoparticles, (TE) teeth were bonded with adhesive not containing silver nanoparticles and (TES) teeth were bonded with adhesive containing silver nanoparticles. Each group was subdivided into 2 subgroups: C1 (10 specimens): 24 hours aging period. C2 (10 specimens): 3months aging period. Finally two representative samples of each group were analyzed using an (ESEM) for interfacial analysis.
result: After 24 hours aging, there was non-significant difference between mean shear bond strength values of the adhesive contain silver nanoparticles (5.09± 1.69) and the nanoparticles free adhesive (4.69± 1.42). Also after 3 months aging there was non-significant difference between both adhesives with (6.31±1.12) and without (5.14± 1.16) addition of silver nanoparticles.
conclusions: The addition silver nanoparticles to total-etch adhesive systems did not hinder bonding of resin composite to enamel. Silver nanoparticles didn’t antagonize penetration of resin tags into enamel. Bonding of brackets with resin composite using total etch adhesive system containing and non- containing Silver nanoparticles doesn’t deteriorate with time.
2016
01
01
1075
1080
https://edj.journals.ekb.eg/article_95421_516c161719646fef7cc4456502245d9b.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
A THREE – DIMENSIONAL EVALUATION OF THE ACCURACY OF “EXPRESS XT” VINYL POLYSILOXANE IMPRESSION MATERIAL USING SPRAY DISINFECTION TECHNIQUE WITH IMMEDIATE AND DELAYED POURING TIME (IN VITRO STUDY)
Norhan
Abd El Haliem
Maha
Taymour
Tamer
Nassef
Amina
Zaki
objectives: The aim of this study was to evaluate the dimensional accuracy of the recently introduced vinyl polysiloxane impression material “Express XT” when subjected to sprayed disinfection with Cavicide1 disinfectant solution at two different pouring times. Using three dimensional DicoMesher software version3.
methods: A total of twenty impressions of a standardized stainless steel mold were made using Express XT impression material in specially fabricated trays. The impressions were subjected to spray disinfection protocol using cavicide 1 disinfectant solution and then divided according to times of pouring into two groups immediate pour according to manufactures instructions and One-week delay pouring. Impressions were poured with a type IV extra hard dental stone. All measurements were performed on the photos of the produced cast by DicoMesher software a computer software program allowing three dimension recording. Results were statistically analyzed
results: Immediate pouring time showed the lowest mean overall dimensional changes while delayed pouring time showed higher mean shrinkage. However, there was no statistically significant difference between the overall dimensional changes of the two groups.
conclusion: Within the limitation of this study we concluded that different pouring times did not harm the dimensional stability of the die material.
2016
01
01
1081
1087
https://edj.journals.ekb.eg/article_95424_c650f881382948672eef40f3165afda6.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
THE EFFICACY OF LASER GLAZING ON SURFACE ROUGHNESS AND STRUCTURE OF ALL-CERAMIC VENEERS
Sara
Hegazy
Azza
Hashem
Shaymaa
Habib
aim of the study : This study was designed to set up proper laser parameters including laser type, power intensity and time of application for glazing of a particular glass-ceramic.
The effect of laser glazing of the glass-ceramics on structural and roughness was investigated, evaluated and compared with the recommended glazing technique.
material and methods :The materials used in this study were two commercially available lithium disilicate ceramics, fabricated by two different techniques: conventional lost wax (Injectable heat – pressed) and machinable Computer Aided Design / Computer Aided Manufacturing (CAD/ CAM) techniques. A total of 50 ceramic samples in the form of discs (5mm diameter and 2 mm thickness). For CAD/ CAM samples, a total of 50 discs were done sequentiallyin the Cerec 3 CPUacquisition unit. Two glazing techniques were adopted to the studied ceramic samples namely; conventional glazing and laser glazing. For each material subjected to the different glazing protocols structural Analysis, Surface Roughness was measured before and after glazing using white light Profilometry.
results: Results of surface roughness (Ra) of the two investigated materials; IPS E-max press and IPS E-max CAD using two different surface treatments; conventional glazing and laser glazing in comparison to the control group are presented. For of M1; IPS E-max press material ANOVA results showed that the control group had the significantly highest surface roughness followed by laser glazing, while the conventional glazing showed the significantly lowest mean surface roughness (p <0.001). Regarding M2; IPS E-max CAD material no significantly difference was found between conventional glazing and laser glazing.
conclusions:Within the limitations of the current study, the following conclusions were drawn:
1. Conventional glazing can be considered as the most reliable glazing technique as regard surface roughness. 2. Laser glazing with high power density increased the surface roughness of lithium silicate based ceramics.
2016
01
01
1089
1096
https://edj.journals.ekb.eg/article_95426_9de585d2335e7803923d613732aaa781.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
EVALUATION OF MONOCYTE CHEMOTACTIC PROTEIN (MCP-1) IN SALIVA AS AN EARLY SIGN OF METABOLIC DISORDERS IN PATIENTS WITH CHRONIC KIDNEY DISEASE
Soheir
Gaafar
Weam
Rashwan
Laila
Rashed
Eman
Ahmed
Chronic kidney disease incidence have been rising since the publication of the practical guide- lines by the Kidney Disease Outcomes Quality Initiation (KDOQI) of the National Kidney Founda- tion (NKF) in 2002 to reach 200 case per million in many countries around the world with survival rate 3 to 5 years. There are many mechanisms by which chronic kidney disease can affect the oral cavity; uremia, hyperparathyroid hormone, anemia, oxidative stress and and the dramatic rise in inflammatory mediators such as IL-1, IL-6, TNF-α, CRP and MCP-1. The oral mucosa, salivary glands, teeth and even periodontal tissues all are affected by the disease. Complications of chronic kidney disease could be prevented if the condition was early detected and controlled; metabolic complications and cardiovascular complication are the most serious complications of chronic kid- ney disease; both can be early detected and controlled. One successful approach to control the com- plications is to monitor the inflammatory mediators such as MCP-1a key chemokine; its increasing level translates the decline in renal function and predates the onset of its serious complications.
subjects and methods: The current study was conducted on 50 individuals divided into 4 groups Group 1(15 with a GFR 59-30 ml/min/1.73 m2 “Stage3 CKD”), Group 2 (15 with a GFR 29-15 ml/min/1.73 m2 “Stage 4 CKD”), Group3 (diseased control group, 10 individuals with chronic moderate to severe periodontitis), Group 4: control group, consists of 10 individuals, these patients were selected to be medically free. All groups were subjected to full history, detailed oral examination and salivary sampling.
results: The salivary MCP-1 values were higher in stage 4 CKD or the late stage (464± 84.7 pg/ ml), a relatively decreased salivary flow rate was found in stage 4 CKD which was (0.8± 0.06 ml/ min). Periodontal disease was higher in stage 4 CKD patients. The gingival index percentage; stage 4 CKD had the significantly higher percentage (95%), the plaque index results showed that the percentage of teeth surfaces with moderate to severe plaque accumulation was significantly higher in stage 4 CKD (94.9%), the clinical attachment level results showed that the percentage of surfaces with moderate to severe periodontitis was (87.6%), patients in stage 4 had the higher DMFT (24.4± 4.5).
2016
01
01
1097
1111
https://edj.journals.ekb.eg/article_95427_29e94f83005c3ea253036b798efb7f30.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
COMPARISON BETWEEN THE EFFECT OF CORTICOTOMY AND LOW LEVEL LASER THERAPY ON PERIODONTAL HEALTH
Noha
El Ashmawi
Essam
Selim
Mona
Fayed
Amr
El-Beialy
The aim of the present study is compare between the effect of surgical corticotomy and LLLT on the periodontal health.
methods: Orthodontic patients whom treatment necessitated maxillary 1st premolar extraction followed by canine retraction, were recruited. Pre-intervention periodontal assessment was performed. At the day of premolar extraction, both interventions (corticotomy and LLLT) were randomly allocated to both sides of maxillary arch followed by canine retraction. Post-retraction periodontal assessment was done 6 months after start of canine retraction.
Results: A statistical significant decrease by (0.29±0.57mm and 0.49± 0.75mm) was found in the gingival margin level of the maxillary lateral incisor on the corticotomy and Laser sides respectively. No statistical significant difference was found between both sides.
Conclusions: Both interventions showed the same minor changes in the level of the gingival margin of maxillary lateral incisor.
2016
01
01
1113
1119
https://edj.journals.ekb.eg/article_95429_803a2b05e9c9bc536bf4bee8db272317.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
DIAGNOSTIC SIGNIFICANCE OF S-100 PROTEIN, VIMENTIN AND HMB-45 MONOCLONAL ANTIBODIES IN SOME ORAL MELANOMAS
Abdelraheem
Elgendy
Khaled
Hussien
The current study was carried out to evaluate and confirm the sensitivity and specificity of S-100 protein, vimentin and HMB-45 immunohistochemical markers in diagnosis of some oral melanomas. Twelve formalin fixed paraffin- embedded specimen of some intra oral melanomas were collected from the archives of the Clinical Pathology Department of the National Cancer Institute, Cairo University, Egypt and the Oral Pathology Department, Faculty of Dental Medicine, Al- Azhar University, Cairo, Egypt between December 2005G and September 2015G. Immunohistochemical application was performed using strept-avidin-biotin peroxidase procedure. The obtained results showed a variable range of positivity of these markers in all studied cases without negative staining. These findings indicated the diagnostic significance of S-100 protein, vimentin and HMB-45 monoclonal antibodies in oral melanomas. Further studies are needed to investigate the role of these markers in metastasis and prognosis of oral melanomas.
2016
01
01
1121
1131
https://edj.journals.ekb.eg/article_95430_21679644e1f516f9be564062f6aca282.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
COMPARATIVE STUDY OF DENTIN BOND STRENGTH, SEALING ABILITY AND ADAPTATION OF TWO DIFFERENT ROOT CANAL SEALERS (AN IN VITRO STUDY)
Anwaar
Abd El-Fatah
Magdy
Ali
Yaser
Hussein
Reham
Hassan
aim of the study: to evaluate dentin bond strength, sealing ability, adaptation and penetration into dentinal tubules of epoxy resin based sealer (MM-Seal) and MTA based sealer (MTA Fillapex).
methodology: Forty extracted human central permanent incisors were selected and decoronated. The canals were instrumented using crown down technique by Revo-S rotary system and obturated using single cone technique. The teeth were divided into two groups (n=20) according to sealer that used in obturation (MM-Seal or MTA Fillapex). For all samples, the coronal three millimeters were used for bond strength test. The remaining apical portions of each group were further divided to be used for dye penetration and SEM evaluation. The obtained data was analyzed using the One Way ANOVA and failure modes were classified as adhesive, cohesive or mixed.
Results: Push-out bond strength test showed that, MM-Seal showed significantly higher values than that of MTA Fillapex while MTA Fillapex showed significantly higher values than MM seal regarding dye penetration test. There were no statistically significant differences between the two filling materials regarding the adaptation and the penetration into dentinal tubules.
Conclusion: MM-Seal root canal sealer performed better than MTA Fillapex in respect of bond strength to dentin of the canal wall, adaptation and penetration into dentinal tubules and lower dye penetration than MTA Fillapex root canal sealer
2016
01
01
1133
1139
https://edj.journals.ekb.eg/article_95431_f3d4196a2643432c77f1898f66621034.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
EFFECT OF DIFFERENT PATTERN CONSTRUCTION TECHNIQUES ON THE MARGINAL ADAPTATION, INTERNAL FIT AND FRACTURE RESISTANCE OF IPS-EMAX PRESS CROWNS
Osama
Saleh
Rania
Amin
Mostafa
Abdellatif
purpose: The purpose of this study was to evaluate the effect of pattern construction technique on the marginal accuracy, internal fitness and fracture resistance of E-max crowns.
materials and methods: Thirty caries-free human maxillary first premolars were selected, cleaned by scaling, and stored in 0.9% standardized saline solution at room temperature. Using an industrial lathe machine, the teeth were prepared to receive all ceramic crowns with standardized dimensions of 6 degrees angle of convergence. The preparation had 5mm occluso-cervical height, 6mm cervical diameter and 1 mm deep chamfer finish line. The prepared teeth were divided into three groups (n=10) according to the pattern fabrication techniques used: Group1: Conventional wax patterns. Group2: CAD/CAM wax patterns. Group3: 3D Printing of resin patterns. All patterns were invested to construct E-max crowns. The ceramic crowns were seated on their corresponding prepared teeth and the vertical marginal gap was measured with a binocular microscope (90X). Then internal gap of each ceramic crown was measured using the silicone replica technique. After cementation, each ceramic crown was statically, compressively and axially loaded until fracture at a cross head speed of 1 mm/min using a steel rod placed centrally at the occlusal surface of the crowns to evaluate the fracture resistance of the crowns.
results: Group 1 showed the largest marginal gap mean (85.74±2.58μm) followed by group 2; (74.06±3.27µm) and then group3 (69.35± 3.44µm). These differences were statistically significant among the groups. The results of internal gap distances in group 1 (112±7.66µm) followed by group 2 (100±5.76µm) and then group3 (82± 7.2µm), the differences between the groups were statistically significant. The mean fracture resistance values of groups 1, 2 and 3 were 850.67±25.30N, 1080.01±47.06N and 1412.18±28.92N respectively. Post hoc test revealed that the differences between groups 1 and 2 as well as between groups 2 and 3 were statistically insignificant; however, the difference between groups 1 and 3 was statistically significant. Spearman’s rank correlation coefficient showed value of - 0.781. The negative sign indicates that the fracture resistance of the samples decreased as the internal gaps increased
conclusions: The 3D printed pattern resulted in an E-max crown with better marginal adaptation and internal fitness. The fracture resistance of E-max crown was improved as its internal adaptation was enhanced.
2016
01
01
1141
1152
https://edj.journals.ekb.eg/article_95432_1b7d014a997c981fbd3a2ccad25aabb9.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
SURFACE ROUGHNESS OF ROOT CANAL DENTIN FOLLOWING MECHANICAL PREPARATION USING DIFFERENT ENDODONTIC FILE SYSTEMS
Ayman
Elkady
Elsayed
Gad
Introduction: This study was conducted to determine the surface topography of root canal dentin after mechanical preparation using different endodontic file systems.
Methodolgy: Twenty single rooted extracted premolars were used. After teeth decoronation, all roots were divided into four groups (five roots each). Group PNX was instrumented by ProTaper Next files, Group W was instrumented by Wave One. Group P was instrumented by Protaper files, and Group H (control) was instrumented by K type hand files. Radicular preparation for all groups was performed according to the each file system’s manufacturer instructions. Roots were split longitudinally in a bucco-lingual direction giving a total of 10 specimens for each group. Samples of each group were photographed at cervical, middle and apical regions of each prepared canal using USB Digital microscope.
Results: Group P showed the highest roughness mean value followed by group H then group PNX while group W recorded the lowest value. The difference between groups was statistically significant. There was no significant difference between group PNX and group W. Apical regions recorded the highest roughness mean value followed by middle regions while cervical region recorded the lowest roughness mean value.
Conclusions: The use of Protaper file system showed the highest root canal roughness while Wave One file system showed the lowest values. Root canal apical regions showed higher roughness mean values than middle or cervical regions in all groups.
Dentin Roughness
NiTi
Rotary
reciprocation
2016
01
01
1153
1160
https://edj.journals.ekb.eg/article_95433_d0bf1e6306bfa25e7f91ce8f6b8a539c.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
MICROLEAKAGE AND MICROSHEAR BOND STRENGTH OF DIFFERENT TYPES OF DENTAL COMPOSITE RESTORATIVE MATERIALS
Mohamed
Ebrahim
Adel
Shaaban
The present study was conducted to evaluate the microleakage and microshear bond strength of different types of dental composite. For microleakage test, 45 caries-free human permanent maxillary molars with no crack, decay, or structural deformities were collected. A standard Class V cavity was prepared on the buccal surface of each tooth. The cavity of each tooth was acid etched and the adhesive material was applied to the etched surface, gently dried and cured. The prepared teeth were divided randomly into three groups, (15 for each group) according to the types of composite. Group A: Tetric EvoCeram nanohybrid composite (Ivoclar vivadent Inc. USA and Canada), Group B: Tetric EvoCeram Bulk fill composite (Ivoclar vivadent Inc. USA and Canada) and Group C: Sonic Fill Bulk fill composite (Kerr Restoratives, USA). The specimens in each group were restored with the corresponding composite and cured according to manufacturer’s instructions. The specimens were submitted to thermo-cycling, covered with nail varnish, followed by immersion in dye solution. Each tooth was sectioned longitudinally using hard tissue microtome. The microleakage was measured using digital microscope at ×10 magnification. The dye penetration in the specimens was evaluated for both the occlusal and gingival surfaces based on a scoring system. Kruskal-Wallis test was used to determine the difference between microleakage scores in the three study groups at a 0.05 level of significance. For microshear bond strength test 30 caries-free human permanent mandibular molars with no crack, decay, or structural deformities were collected. The occlusal surface of the teeth were ground perpendicular to the long axis of each tooth to expose a flat dentin surface. A dentine slice with thickness 2 mm was sectioned perpendicular to the long axis of each tooth. The surfaces of dentin slides were acid etched and the adhesive material was applied to the etched surface, gently dried and cured. The specimens were divided into three main groups (10 for each group) according to the type of composite resins used as in microleakage test. Composite resins was placed, cured and the specimens were submitted to thermocycling before testing. The recorded values of bond strengths in (MPa) were collected, tabulated and statistically analyzed. One way analysis of variance (ANOVA) and Tukey’s tests were used for testing the significance between the means of tested groups. The results showed that Tetric EvoCeram nanohybrid composite had the highest scores of microleakage followed by Tetric EvoCeram Bulk fill and Sonic Fill Bulk fill which showed the lowest scores. The results also showed that Sonic Fill Bulk fill composite had the highest microshear bond strength value followed by Tetric EvoCeram Bulk fill and Tetric EvoCeram nanohybrid composite which showed the lowest value.
2016
01
01
1161
1168
https://edj.journals.ekb.eg/article_95434_31498baddd50031d5c122109d7eb8dc4.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
THE EFFECT OF TWO PACKING TECHNIQUES ON ADAPTATION OF RESIN DENTURE BASE MATERIALS
Ehab
Aboelroos
Amr
Rady
Background: Acrylic resin denture bases undergo dimensional changes during polymerization. Injection molding techniques are reported to reduce these changes and thereby improve physical properties and adaptation of denture bases. The aim of this study was to compare denture baseadaptation processed by conventional and injection-molding techniques.
Materials and Methods: Twenty one accurate denture bases with the same dimension were fabricated and divided into three groups. For the first group, sevenpolymethyl methacrylate denture bases were made using conventional compression moulding technique and for the other two groups, two different injection mouldingunits were used to produce seven polyamide bases (thermo-plasticized) and seven polymethyl-methacrylate (PMMA) bases (themo-polymerized). The adaptation accuracy was examined using universal measuring microscope. The gap between the resin base and stone cast was measured at posterior palatal area at five points, corresponding to the right and left residual ridge crests, the midline, and the right and left marginal limits of the flanges.
Results: Injection molded bases showed significant lower total gap scores at the crest and the palate compared to the conventional compression molded ones. However, there was no statistically significant difference between both groups at the vestibular gap. Injection molded poly-amide resin denture bases showed significant difference compared to PMMA injected molded ones.
Conclusion: Injection moulded polyamide resin has superior dimensional accuracy and adaptation compared to conventional pressure packed or injection moulded PMMA resin
2016
01
01
1169
1176
https://edj.journals.ekb.eg/article_95435_d7596e219065b59a039d065e2a565807.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
EFFECT OF DENTIN PRETREATMENT REGIMENS USING GRAPE SEED EXTRACT ON MICROSHEAR BOND STRENGTH AND COLOR STABILITY
Maha
Elkorashy
Dalia
Sherief
Objective: To investigate the effect of 10% and 15% Proanthocyanidin (PA) rich grape seed extract (GSE) applied for 60s and 120s and removed either by wiping or rinsing on microshear bond strength (µSBS) and color stability (ΔE).
methods: Sound bovine incisors were used in the study. The labial surfaces were ground to expose flat dentine surfaces. The specimens were divided into 9 groups; control group without any pretreatment and 8 groups pretreated with 10 % and 15% GSE, applied for 60s and 120s and then removed either by wiping with wet cotton or rinsing with water. Microshear bond strength (µSBS) was tested using a universal testing machine at a cross head speed of 0.5mm/min. A spectrophotometer was used for color measurement (ΔE) of the specimens using CIE (L*a*b*). Data were tabulated and statistically analyzed.
Results: All pretreatment groups showed significantly higher µSBS values than the control group which showed the lowest value (19.63±3.07). Group VIII showed the highest µSBS value (31.96±2.77) and the highest ΔE (3.14±0.38). All pretreatment groups showed a clinically accepted color change with a ΔE < 3.3.
Conclusion: The use of GSE in different regimens improved resin-dentin bond strength and demonstrated clinically accepted color change. The use of 15% GSE applied for 120s and wiped with wet cotton is the recommended regimen.
Grape seed extract
dentin pretreatment
bond strength
color stability
2016
01
01
1177
1188
https://edj.journals.ekb.eg/article_95436_ec49e57d213421b51d8cafb8d437e071.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
EFFECT OF INTRA-ARTICULAR CORTICOSTEROID INJECTIONS ON TEMPOROMANDIBULAR JOINT STRUCTURE (EXPERIMENTAL STUDY)
Asmaa
Ghazal
Amany
Nemat
aim of the study: to evaluate the short term effect of corticosteroid injection on temporomandibular joint structure.
materials and methods: Thirty six adult rats with weight ranged between 150-200 gm were included in the current study with normally functioning temporomandibular joint. The rats were divided into three groups: A, B, and C. every group is divided into (2) sub-groups. Each sub- group had (6) rats. All rats of the group A were injected one time, A1 sacrificed after one week, A2 sacrificed after 2 weeks form injection. all rats of the group B were injected 2 times at (0&6 weeks), B1 sacrificed after one week from last injection, B2 sacrificed after 2 weeks form last injection. . all rats of the group C were injected 3 times at (0,6&12 weeks), C1 sacrificed after one week from last injection, C2 sacrificed after 2 weeks form last injection.
Results: injection of corticosteroids for the 3rd time showed signs of inflammatory invasion and fatty degeneration showed in all cases.
Temporomandibular joint
corticosteroids effect
depo-Medrol injection
2016
01
01
1189
1193
https://edj.journals.ekb.eg/article_96967_c2bf6b1d9e3fc166dd8bde7af94844dd.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
THE EFFECT OF TWO PROTECTIVE OCCLUSAL SCHEMES OF IMMEDIATELY LOADED MINI-IMPLANT SUPPORTED MANDIBULAR OVERDENTURE ON MASSETER MUSCLE ACTIVITY AND RIDGE KERATINIZATION
Essam
Aziz
Nermine
Amin
background: Lingualized and monoplane occlusal (LO and MO) schemes are the most protective schemes regarding the prognosis of the immediately loaded mini-implants. The occlusal scheme in complete overdentures is a prime factor that affects masticatory efficiency that will subsequently determine the forces transmitted through the denture base to the denture foundation thus affecting ridge keratinization reaction as well as the degree of mini-implant osseo-integration .
material and methods: Twenty completely edentulous male patients were divided into two equal groups. Complete upper and lower dentures were constructed for all patients with their artificial teeth set following the LO scheme for group I patients and the MO scheme for group II patients. Four mini-implants were installed interforaminally and immediately loaded in each patient. Electromyographic (EMG) records, keratinization index (KI) values and periotest values (PTVs) were collected at the time of denture delivery, one month and four months after denture delivery.
results: Median EMG and KI values for LO and MO groups showed a significant increase after 1 and 4 months. Similarly, the median PTVs for LO group increased along the follow up periods showing a significant increase after 1 and 4 months. However, the median PTVs for MO group showed a perculating pattern showing a significant increase after 1 month followed by a significant decrease after 4 months of denture delivery. Changes in median KI values for MO group showed a significant difference than that for LO group after 1 and 4 months. Changes in median PTVs for LO group showed a significant difference than that for MO group after 4 months only. A significant inverse correlation was noticed between changes in EMG records and PTVs as well as between PTVs and KI values after 4 months of denture delivery
2016
01
01
1195
1209
https://edj.journals.ekb.eg/article_96968_b0e3815ece85dd465f74c5705f9094b6.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
QUALITY OF SINGLE CONE AND GUTTA CORE OBTURATION IN CURVED ROOT CANALS AFTER NEEDLE OR DIODE LASER IRRIGANT ACTIVATION USING CONE BEAM COMPUTED TOMOGRAPHY AND STEREOMICROSCOPE
Latifa
Abdelgawad
Objective: The purpose of this study was to assess the quality of single cone and gutta core obturation in curved root canals of the mandibular molars after needle and diode laser activation of both ethylenediaminetetraacidic acid (EDTA) and sodium hypochlorite (NaOCl) irrigation using cone beam computed tomography (CBCT) and stereomicroscope.
Methods: A total of twenty –four extracted human mandibular molars with root canal curvature more than 20 degrees and type IV anatomic configuration in the mesial roots were selected for this study. Canals in mesial roots were prepared with ProTaper next instruments up to x3 and equally divided into two experimental groups (n=12) according to final one minute activation for each of 5 ml 2.5% NaOCl and 5 ml 15% EDTA using; side-vented needle (group1) or 980 nm diode laser (group2). After preparation, the mesial canals were randomly obturated with either single-cone gutta-percha (sub group A) or gutta core Obturator (subgroup B). Obturated canals were scanned with cone beam computed tomography; images were used to assess the quality of obturation at different canals levels. The roots were subsequently sectioned at 2, 4, 6, 8 and 12 mm levels from the apex for analyses of the percentage of gutta percha filled area (PGFA) and percentage of sealer filled area (PSFA) using stereomicroscope to examine the root sections. The areas of gutta percha and sealer for each segment of the root were measured using Image J software. Kruskal-Wallis test was used to analyze data.
Results: Both cone beam and digital stereomicroscopic data indicated that canals obturated with gutta core after irrigant activation had the highest PGFA. The Gutta core and diode laser acti- vation group produced significantly higher PGFA and lower PSFA at different root canal levels 4,6 and 8 mm levels of the root canal (P < .05) than all other groups at the same levels (P < .05). Single cone and EDTA has the lowest PGFA and highest PSFA (P < .05).
Conclusions: The results reinforced that 980-nm Diode activated irrigation improved the qual- ity of obturation of the mesial root canals in mandibular molars by using gutta core or single cone. Variation in root canal obturation technique and irrigation activation influenced the percentage of gutta percha filled area and percentage of sealer filled area.
Diode laser
side-vented needle
gutta-percha filled area
sealer filled area
curved root canals mandibular Molars
CBCT and stereomicroscope
2016
01
01
1211
1220
https://edj.journals.ekb.eg/article_96969_18a422ef1ca912ebc773ad939b20c868.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
EROSIVE AND ABRASIVE POTENTIALS OF SOFT DRINKS AND AIR POLISHING ON NANO-FILLED COMPOSITE RESIN
Enas
Enan
introduction: Erosion is a common condition that is related to consumption of acidic food and drinks such as; carbonated drinks and fruit juices that might cause early deterioration of the dental restorations. Abrasion of dental restorations might result from physical factors such as tooth brushing or polishing.
objective: This study aimed to assess the combined erosive potential of cola soft drink and orange juice, and the abrasive potential of air-polishing, on the surface of nano-filled composite resin restorations via evaluation of microhardness and surface roughness.
materials and methods: A total of 60 specimens were prepared from nano-filled composite resin. Specimens were divided into 3 groups according to the immersion media (water, cola, orange juice), and each was further subdivided into 2 subgroups (unpolished or polished). Surface hard- ness was measured using a digital micro-hardness tester, and surface roughness was recorded using a profilometer. Data were analyzed by one-way analysis of variance (ANOVA) and Tukey’s post hoc test.
results: A significant decrease in surface hardness was observed on immersion of nano-filled composite in either cola or orange juice. Except for the control group, the air-polished specimens had significantly higher surface hardness when compared to the unpolished ones. Cola and orange juice had a significant roughening effect on composite resin surface. Further increase in Ra values was recorded after air-polishing of both groups.
Conclusion: Combining beverages immersion with air-polishing may have a profound effect on the surface deterioration of nano-filled composite resin
Nano-filled composite
Soft Drinks
surface hardness and roughness
2016
01
01
1221
1229
https://edj.journals.ekb.eg/article_96970_76abf227efbb2ec8443e91389643720a.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
THE ROLE OF THE PROPOLIS ON THE PREVALENCE OF DESTRUCTIVE PERIODONTAL PATHOGEN IN AGGRESSIVE PERIODONTITIS
Mohamed
El-Shennawi
Mansour
Asiri
The present study was carried out on eighteen patients having aggressive periodontitis
(exhibiting at least three single-rooted teeth with periodontal pocket depth ≥ 5mm) divided into
3 groups, each group was six patients. It was noticed that, surgical treatment of aggressive periodontitis was shown to be more effective than conventional scaling and root planing procedures alone. Additionally, the use of antibiotic agent as adjunctive to surgical treatment was proven to be beneficial in the reduction or elimination of bacterial load in the tissues invaded the periodontopathogens. Among the known natural antibacterial agent, is the Propolis (bee glue) which also has many other pharmacological properties such as anti-inflammatory, and immune- modulatory properties. Therefore, the purpose of this study was to clinically evaluate the effect of Propolis in the treatment of aggressive periodontitis, and microbiologically test its effect against Actinobacillus actinomycetemcomitans. Clinical evaluation was performed using plaque, bleeding indices and PPD and CAL at baseline, six weeks and three months after surgical treatment for both groups (II), (III). The results revealed that there was statistical significant improvement in all clinical parameters for all patients after different methods of treatment. Microbiological, positive culture results were revealed in all samples collected before treatment, on the other hand, negative culture results were revealed in all samples collected six weeks after surgical treatment for both groups (II) & (III), as well as in all samples of group (III) collected after three months after treatment. Through this study we can concluded that systemic administration of propolis with SRP and periodontal flap surgery showed clinical and microbiological improvement reduction results in patients with aggressive periodontitis.
2016
01
01
1231
1242
https://edj.journals.ekb.eg/article_96971_30e19c96d38cbb63e796ffac5ff6f18a.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
SHADE MATCH OF CAD/CAM LITHIUM SILICATE ALL-CERAMIC RESTORATIONS: EFFECT OF CERAMIC THICKNESS AND NON- TOOTH COLORED FOUNDATION
Samah
Saker
Statement of problem: Assessment of lithium silicate ceramics as regard to its thickness variances need evaluation with regard to color match to shade guide.
Purpose: This study aimed to investigate the effect of ceramic thickness and foundation restoration on color production of lithium silicate glass- ceramics.
Material and Methods: A total of 60 rectangular plate slices disks of shade A1 were prepared from CAD/ CAM generated all-ceramic materials IPS e.max CAD (EM) and Vita suprinity blocks(ZLS), with different thickness (1mm, 1.5 mm and 2mm). The color of ceramic specimens before and after bonding to foundation blocks were measured using a reflectance spectrophotometer and CIE L*a*b* (Commission Internationale de L’Eclairage) color system were used for calculation of color parameter. The collected data were statistically analyzed using two-way ANOVA and the Tukey HSD test (α=.05).
results: The 2-way ANOVA showed that the ceramic material composition (P<.05), ceramic
thickness (P<.05) and tooth foundation all significantly affected ΔE values (P<.05).
conclusions: Reinforcement of CAD/CAM lithia silicate glass-ceramics by zirconia decreases the color match. Acceptance level between the two tested ceramic materials and thickness varied. At all evaluated thicknesses before bonding to foundation blocks, EM presented higher shade matching compared to ZLS. The effect of non tooth colored foundation can be overcome by increasing the thickness of fabricated restoration to enhance color production.
Lithium silicate ceramic
Glass-Ceramics
Color
ceramic thickness
2016
01
01
1243
1250
https://edj.journals.ekb.eg/article_96972_ac9ba92123239bd72997322bedf0c352.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
DIGITAL SPECTROPHOTOMETER EVALUATION OF THE INFLUENCE OF SCREW COLOR AND ACCESS HOLE FILL ON THE COLOR OF SCREW- RETAINED IMPLANT CROWNS
Sahar
Abdel Wahab
Statement of problem: Although screw-retained implant crowns are commonly preferred by clinicians, there remain a limited number of studies on how color affected by screw color and access hole fill.
purpose: The purpose of this study was to determine the influence of screw color, opaque shade and composite thickness on the color of screw-retained implant crowns with use of digital spectrophotometer.
materials and methods: eighty specimens were divided into two groups ,gray group (pure titanium) and golden-colored group (anodized titanium) which used as two backgrounds. Composite discs with 1mm, 2mm,0.5mm opaque+0.5mm composite and 0.5mm opaque+1.5mm composite were fabricated. Titanium specimens and composite discs were placed into a collective mold in various tested groups for color measurements.
reSultS: Quantitative in concern to clinical color matching tolerance, It was found that, group 4A and 4B recorded the lowest ∆E as they could not detected by human eyes. Quantative color matching evaluation showed, no significant differences between gray and golden colored titanium(background), (P >0.05) while golden colored titanium gave higher ∆E than grey titanium group. For grey titanium; it was found that Group (4A) was the lowest ∆E value (1.20±0.4), followed by Group(2A) (4.00±1.3∆E), then Group (3A) (5.55±1.8 ∆E)while Group (1A) was the highest (7.6±2.53∆E) The difference in color change was significantly where (P= 0.001<0.05).\ For golden colored titanium; it was found that Group(4B) recorded the lowest ∆E value (1.15±0.38) followed by Group (2B)(3.65±1.26∆E) then Group (3B) (4.15±1.3∆E) while Group (1B) was the highest (5.55±01.8∆E). The difference in color change was significantly where (P= 0.0001<0.05).
conclusion: composite thickness and opaque shade composite affected ∆E values (p<0.05). while, the color of the background did not affect ∆E values (p>0.05) of the color of final restoration.
clinical implications: Screw color and access hole fill play an important role on the color of screw-retained implant crowns. In present study, regardless the implant color, the use of 0.5mm opaque composite covered by 1.5 mm composite resin affected the color of final restoration significantly.
2016
01
01
1251
1260
https://edj.journals.ekb.eg/article_96973_380e95d921d9203aab4969e58b43421c.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
THE SIGNIFICANCE OF THE POSITIONAL RELATIONSHIP BETWEEN THE SURFACE OF THE DENTIN SUBSTRATE AND THE BONDING AGENT ON THE BOND STRENGTH TO DENTIN
Hala
Fares
60 non carious, extracted human teeth were used in this study, for evaluating the shear bond strength of composite resin to dentin using the all in one adhesive system (prompt L-Pop). All teeth were divided into four groups to represent four different surface substrate inclinations. Analysis of variance (ANOVA) test was performed to assess the presence of significant differences in mean shear bond strengths at different surface substrate inclinations (whether the different inclinations of surface substrate produced significant effect on the mean shear bond strengths). Student-Newman-Keuls test and the least significant difference procedure were used for pair wise comparison between means to find out which means were significantly different. The above tests were separately performed for the groups of specimens that were immediately investigated; those that were stored for one week and those that were stored for one month. ANOVA test, also, was performed to study the effect of time on the shear bond strengths of all groups of specimens at each substrate inclination through all time periods.
results: Within each time period, the results revealed that different inclinations of surface substrate produced statistically significant changes in the mean shear bond strengths, (P < 0.001). The mean shear bond strengths of the group of specimens to which the application of the adhesive system was performed with the occlusal plane of the lower jaw of the phantom head parallel to the floor (group A4), were significantly higher than the other 3 groups (P < 0.05). Group A2 (the group of specimens to which the application of the adhesive system was performed with the occlusal plane of the upper jaw of the phantom head making a forty five degree angle with the floor), came next. The ranking of groups according to the mean shear bond strengths was : A4 > A2 > A1 > A3. Regarding the effect of storage time (one week and one month) on the mean shear bond strengths of the adhesive system used, it was found that there were no significant differences among the shear bond strengths of any of the tested groups, at any substrate inclination, through all time periods (T0, T1, T2) (P > 0.05).
2016
01
01
1261
1271
https://edj.journals.ekb.eg/article_96974_7f37cd8203485103532ebf1937d47082.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
THE PREVALENCE OF DENTAL CARIES AMONG YOUNG ADULTS IN CAIRO- EGYPT. A STATISTICAL STUDY
Hala
Fares
To date, it is inevitable; according to the available epidemiological data; that the prevalence of dental caries is rapidly increasing. In this cross- sectional study, a survey was conducted on 3778 secondary school students aged 15-18 years old. The overall prevalence of dental caries was determined (53.8%); and a comparison was set between male and female candidates regarding the prevalence of caries where no statistical significance was reported.
prevalence of dental caries
young adults
gender difference
2016
01
01
1273
1277
https://edj.journals.ekb.eg/article_96975_dbd9319780203e5685cf3cd6571de447.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
RANDOMIZED CONTROL TRIAL FOR RADIOGRAPHIC ASSESSMENT OF TWO DIFFERENT ATTACHMENT MATERIAL RETAINING BAR SUPPORTED OVERDENTURE
Rami
Ghali
Hesham
Alameldeen
Objectives: this research was carried out to evaluate two different attachment material retainers bar supported overdenture regarding the peri-implant crestal bone level changes.
materials and methods: Twenty edentulous female patients participated in this study For each patient 3 endosteal implants were inserted in the interforamenal region using computer guided surgical Stent. Four month later implants were uncovered, healing abutments were secured and then transfer coping with long heads were used to make open tray impression technique. Plastic abutments were secured to implant analogue then plastic bars was attached to plastic abutments using durallay with two semi precision attachments at the distal ends of the bar. Then the bar was casted. Patients were divided into two groups. Group one the CAD CAM wax pattern of housing and the female part of the attachments were casted using nickel chrome alloy. Group two patients the CAD CAM wax pattern of housing and the female part of the attachments were transferred into Acetal resin using the injection molded technique. Then per implant crestal bone level were assessed using long cone parallel technique after six, twelve and twenty four months and then statistically analyzed.
Results: This study showed that there was a statistically insignificant difference in between follow up periods for each group and between groups in between follow up period in interval 12-24 and significant difference between two groups after 24 months.
Conclusion: Based on the results obtained from this study it can be concluded that acetal resin is favorable long term solution for implant retained mandibular overdentures
2016
01
01
1279
1287
https://edj.journals.ekb.eg/article_96976_154c62923aafd000807e980ba5088ee4.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
EFFECTS OF FLEXIBLE ACRYLIC OBTURATOR VERSUS HEAT CURED ACRYLIC OBTURATOR ON SPEECH QUALITY OF CHILDREN WITH CONGENITAL CLEFT PALATE
Noha
Nawar
Mariem
Wassel
2016
01
01
1289
1298
https://edj.journals.ekb.eg/article_96977_779b8db14ca834bf25b7d6c65ad39a18.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
EFFECT OF DIFFERENT IRRIGATING SOLUTIONS AND MECHANICAL AIDS ON THE REMOVAL OF CALCIUM HYDROXIDE INTRA-CANAL MEDICATION FROM STRAIGHT AND CURVED CANALS
Soliman
Kamha
Emad
Khattab
aim: to study effect of different irrigating solutions and mechanical aids on Ca(OH)2 removal from straight and curved canals.
materials and methods: Forty five maxillary central incisors with straight roots (group I) were prepared with step back technique until apical size 55 and forty five mandibular first molars with curved mesio buccal canals (group II) prepared with Pro Taper universal system up to apical size F2. Calcium hydroxide was applied into all canals and the accesses were sealed with temporary dressing. All teeth were placed in wax mould and digital radiographs were taken to confirm canal filling with Ca(OH)2 to length. Every group was subdivided into 3 subgroups according to the irrigating solution used; subgroup A irrigated with 5.25% NaOCl only, subgroup B irrigated with 5.25% NaOCl and 10% H2O2, and subgroup C irrigated with 5.25% NaOCl and 17% EDTA. Every subgroup was further subdivided into 3 subgroups (1, 2, and 3) according to the mechanical aid for Ca(OH)2 removal; in subgroup 1 used master apical file, in subgroup 2 used master apical file and apical patency, in subgroup 3 used master apical file, apical patency and increase in canal size. Post removal digital radiographs were taken for all teeth in their wax mould. Any traces of Ca(OH)2 were traced by “Image J” software and estimated as a percentage to the total canal space and statistically analyzed.
results: There was no significant difference between the subgroups A, B, and C in anterior and posterior teeth either in subgroup 1, 2, or 3. In anterior teeth group, there were significant differences between subgroups 1, 2, and 3 in subgroup B and C but, in subgroup A, there was no significant difference. In posterior teeth group, there was a significant difference between subgroups 1, 2, and 3. in subgroup A but, in subgroup B and C, there was no significant difference. Anterior and posterior teeth were compared and the results were significant differences in subgroups A1 and A2 but, in subgroup A3 there was no significant difference. In subgroup B, there were significant differences in subgroups B1, B2 and B3. In subgroup C, there was no significant difference in subgroups C1, C2 and C3.
conclusions: Under the tested conditions of this study, the most successful method of Ca(OH)2 removal was the use of master apical file (hand or rotary), apical patency and increase one size filing with the combination of EDTA and NaOCl irrigation in both anterior & posterior teeth.
Removal of calcium hydroxide
calcium hydroxide intra-canal medicaments
2016
01
01
1299
1308
https://edj.journals.ekb.eg/article_96978_247c5aba640ab4e95ca949db7de295bd.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
CANAL TRANSPORTATION AND CENTRIC ABILITY OF FOUR DIFFERENT NITI ROTARY SYSTEMS IN CURVED CANALS
Soliman
Kamha
aim: to study canal transportation and centric ability of four different NiTi rotary systems in curved canals.
materials and methods: forty extracted mandibular first molars with similar length and root curvature were selected. All teeth were accessed and working length determined. Teeth were embedded in heavy body rubber base impression material after cutting of distal root to the cervical level. The teeth were randomly assigned to four groups, ten for each. Group I was prepared with ProTaper universal up to F2, group II was prepared with ProTaper Next up to X2, group III was prepared with WaveOne up to primary file, and group IV was prepared with Wave One Gold up to primary file. All teeth were submitted to Pre and post instrumentation scanning with multislice CT and root cross-sections were saved and compared at three levels; 3 mm from the apex (apical), 3mm from the canal orifice (coronal), and mid way between the two measurements (middle). Canal transportation and centric ability were estimated and statistically analyzed.
Results: there was no significant difference between the four groups in apical and coronal levels, but, in middle part, there was a significant difference between them regarding canal transportation and centric ability.
Conclusion: the WaveOne Gold NiTi primary reciprocating file maintained the original canal anatomy with less modification of the canal curvature compared with other file systems up to apical size 25.
Canal transportation
centric ability
WaveOne Gold
WaveOne
Protaper Next
ProTaper Universal
2016
01
01
1309
1319
https://edj.journals.ekb.eg/article_96979_7c5bf4dee446bef29b0c018432cf0d87.pdf
Egyptian Dental Journal
0070-9484
0070-9484
2016
62
Issue 1 - January (Part 5)
HISTOLOGICAL AND IMMUNOHISTOCHEMICAL STUDY OF CHROMIUM TOXICITY IN RAT SUBMANDIBULAR SALIVARY GLANDS
Koura
S
Saad
M.
24 male albino rats (200-220 mg body weight) were utilized in the current study. They were divided into three groups. The first group was control group (6 rats) received drinking tap water containing permissible correlation of hexavalent chromium Cr (VI) 50-100 Mg/L for 4 months. The drinking tap water with added 450 mg/L of hexavalent chromium as chromium trioxide (Cr2O3) for 4 months. Study group (II) (9 rats) received same drinking water as study group (I) with administrated
2.5 mg vitamin E oil daily along four months. Samples from submandibular salivary glands were prepared for histological examination with (H&E stains) and immunohistological investigation of ki-67 proliferation matrix. Group (I) animals revealed histopathological degenerative changes in submandibular salivary gland acini. The blood vessels were dilated and engorged. The connective tissue stroma revealed increase in thickness. The immunoexpression of Ki-67 in the nuclei of the cells was less than 5% of the same group, where the ducts of the acini showed increased percent of Ki-67 expression. Group (II) received vitamin E in addition to Cr (IV), showed some recovery to normal structure of the submandibular salivary glands. This might states the protective effect of Vitamin (E) as an antioxidant against cytotoxic effect of hexavalent chromium.
2016
01
01
1321
1328
https://edj.journals.ekb.eg/article_96980_c324fef81fec3f05da13b99bcb8b9cb3.pdf