Comparative study of bone height changes around immediately loaded porous tantalum parallel sided Trabecular & Screw shaped implants retaining mandibular implant- overdentures using CBCT (RCT)
Azza
Farahat
Associate Professor in Removable Prosthodontics, Department, Faculty of Dentistry, Cairo University
author
Noha
Nawar
Associate Professor in Removable Prosthodontics, Department, Faculty of Dentistry, Ain Shams University
author
text
article
2019
eng
Objective: This study was conducted to evaluate the crestal bone height changes of immediately loaded Porous trabecular tantalum dental implants (PTTM ) and screw shaped titanium implants in mandibular two implant overdenture with CBCT scan. Subjects & Methods: Fourteen completely edentulous patients were rehabilitated with maxillary complete dentures & immediately loaded mandibular two implant overdentures. Patients were selected according to certain inclusion & exclusion criteria. Conventional maxillary & mandibular complete dentures were constructed for all patients. Patients were then randomly divided into two equal groups according to the implant type. Group (I-Intervention Group): TM implants & Group (II- control Group): Conventional titanium Screw implants were utilized. Implants were installed in the mandibular interforaminal region. Implants were immediately loaded with ball retained overdentures. Radiographic Evaluation of crestal bone height changes around the implants was made with CBCT scan; at the denture insertion visit, 6, 12 , & 24 months after denture insertion. Data were collected, tabulated & statistically analyzed. Results: All patients were satisfied with their implant overdentures, No implant loss were recorded during the follow-up Period. The results of this study had revealed that the crestal bone height gradually decreased throughout the study period in the two studied groups. The mean values of crestal bone loss were (0.497mm± 0.161, 0.362mm ±0.045, 0.120mm.±0.13, 0.9 mm±0.67) and (0.65mm± 0.076 , 0.338mm±0. 047, 0.75 ±0.407, 1.20 ±0.108) in group I & Group II respectively at 0-6 month, 6- 12 month, 12- 18 month and from 0-24 month intervals. On comparing the studied Groups: The crestal bone loss was greater in Group (II) than Group (I) along the whole follow-up intervals. In the 1st & 2nd follow -up intervals; (0-6month & 6-12 Months) bone loss was greater in Group (II) than Group- I with statistically insignificant difference (P-values 0.069 ns &0.400 ns respectively). However, in the 3rd interval (6-12months) & (12-18 months) and( 0-24months), bone loss was significantly higher in Group-II than Group-I; with (P=0.000*). Conclusions: Within the limitation of the current study: Trabecular Tantalum Dental Implants (PTTM) may induce less crestal bone loss than conventional screw-shaped titanium implants in immediately loaded mandibular implant overdentures.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3571
3580
https://edj.journals.ekb.eg/article_75975_5d531dd9c48c5880dcaf0072f4e77438.pdf
dx.doi.org/10.21608/edj.2019.75975
Remineralization Potential of Chicken Eggshell Powder in The Treatment of Artificially Induced Enamel Carious lesion in Permanent Teeth
Eman
Elbahrawy
Lecturer of Dental Biomaterials, Department of Dental Biomaterials, Faculty of Dentistry, Tanta University, Tanta, Egypt
author
Ahmed
El -Dosoky
Lecturer of Oral health & Preventive Dentistry, Faculty of Dentistry, Tanta university, Egypt
author
text
article
2019
eng
Objectives: This study aimed to assess and compare the enamel remineralization potential of chicken eggshell powder (CESP) solution or slurry on initial enamel caries in permanent teeth. Materials and methods: 20 caries-free human premolars were used in this study. The mineral content and surface microhardness of all specimens were initially assessed using EDX and Vickers microhardness tester respectively (positive control group). The specimens were artificially demineralized for 96 hours and then reassessed directly after demineralization (negative control group). All demineralized specimens were randomly divided into two equal groups according to the remineralization regimen used : group(I) 10 specimens were immersed in CESP solution for 12 mins, while group (II) : 10 specimens were finger rubbed with CESP slurry for 2 mins. The remineralizing agent was applied twice daily for 7 successive days. After that, the specimens were reassessed for mineral content (Ca and PO4 weight %) and surface microhardness. Finally, the pH-cycling models were used for each group followed by reassessment. The data was statistically analyzed using repeated measures analysis of variance (ANOVA). All analysis was performed with a significance level set at 5% (P≤ 0.05)..Results: There was significant decrease in both Ca and PO4 weight % after demineralization in all specimens and then it was significantly increased after treatment with remineralizing agents as detected by EDX (p <0.001). Vickers microhardness results confirmed elemental analysis results. However, there was no statistical significant difference between the two remineralized groups. In addition, there was no statistically significantly difference in the mean Ca/P wt% between (after pH cycling models ) and that of sound enamel in both groups. Also, there was no statistically significant difference in the mean Ca/P wt% between the two remineralization regimen (Gp I and Gp II) when comparing each step separately. Comparing the microhardness of enamel specimens between the four steps of the study (Sound enamel, demineralized enamel, treatment with CESP and pH cycling after treatment) revealing a statistically significant difference between 4 steps in both group I& II except for the comparison between treatment with CESP and pH cycling after treatment Conclusions: CESP has a promising future in treating initial enamel surfaces lesion due to its natural source and easy bioavailability. Remineralization using CESP solution has a similar efficacy to that of topical application of CESP slurry using finger rubbing.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3581
3593
https://edj.journals.ekb.eg/article_75976_0ac81352627969bd99f3ab9877462b42.pdf
dx.doi.org/10.21608/edj.2019.75976
Effect of non surgical periodontal therapy combined with doxycycline on the levels of gingival crevicular fluid of nitric oxide
Moshira
Mohamed
Demostrator at Oral Medicine, Diagnosis and Periodontology Department, Faculty of Oral and Dental Medicine-
Nahda University
author
Mohamed
Ibrahim
Prof. of Oral Medicine, Diagnosis and Periodontology Department, Faculty of Dentistry, Minia University
author
Osama
Sayed
Ass. Prof. of Oral Medicine, Diagnosis and Periodontology Department, Faculty of Dentistry, Suez Canal University
author
Ahmed
Khalil
Lecturer of Oral Medicine, Oral Diagnosis and Periodontology Departmement Faculty of Dentistry, Minia University
author
text
article
2019
eng
Reactive oxygen species (ROS) and antioxidant activity have been involved in pathogenesis of periodontitis and investigated by many studies. Nitric oxide (No) one of ROS plays important role in increase pathogenesis of periodontal disease. Tetracycline derivatives like doxycycline is considered a ROS scavenger. It works as antioxidant, lessen oxidative stress and improve NO bioavailability.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3595
3600
https://edj.journals.ekb.eg/article_75977_831d3d45841689dfef8c9cb9539471c9.pdf
dx.doi.org/10.21608/edj.2019.75977
Comparative analysis of the cleaning ability of single file versus multiple file system (An in vitro study)
Shady
Ibrahim
B.D.S (Misr International University)
author
Amr
Bayoumi
Lecturer of Endodontics (Misr International University)
author
Ehab
Hassanein
Professor of Endodontics, Chairman of Endodontic department (Ain-Shams University)
author
text
article
2019
eng
Aim: The purpose of this study was to assess smear layer removal following canal preparation with single file (One Shape file) and multiple file system (Protaper Universal files).Methodology: Sixteen freshly extracted mandibular molars were tested and divided into two experimental groups (n=8): group 1, cleaning and shaping was done using One Shape file (8 canals); and group 2, cleaning and shaping was done using a kit of Protaper Universal Files till file F2 (8 canals). Two grooves were prepared on the lingual and buccal surfaces of the instrumented roots by disc to facilitate vertical splitting with a chisel after canal instrumentation. The presence of smear layer was evaluated under SEM in the apical, middle and coronal thirds of the canals. Blind evaluation was done by two trained evaluators and scores were complied separately. Data were then collected, tabulated and statistically analyzed.Results: Smear layer scores showed no statistically significant difference either in comparison between the two systems or between different root levels in each group.Conclusions: Under the condition of the current study, both rotary systems failed to remove smear layer at different root canal levels using saline only as an irrigant.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3601
3606
https://edj.journals.ekb.eg/article_75978_149778953908c0a631a9c60fcad61df1.pdf
dx.doi.org/10.21608/edj.2019.75978
Influence of the background color and thickness of zirconia reinforced glass ceramics on the optical properties compared to lithium disilicate glass ceramics
Yasser Lotfy
Abdelnaby
Professor, Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
.
author
Maha
Taymor
Assistant Professor of Fixed Prosthodontics, Faculty of Dentistry, Cairo University
author
Zyad
Rabie
Lecturer of Fixed Prosthodontics, Faculty of Dentistry, October 6 University
author
text
article
2019
eng
Statement of problem. Optical properties of contemporary all ceramic restorations are influenced by background color and thickness has dearth of information.Purpose. The purpose of this study was to evaluate the influence of the background color and thickness of zirconia reinforced glass ceramics on the optical properties compared to lithium disilicate glass ceramic.Materials and methods. Fifty six ceramics rectangular plates were made from zirconia reinforced glass ceramic and lithium disilicate glass ceramic plates (n=28). The dimensions of the plates were (14 x 12 mm). The plates of each group were divided into two subgroups of two different thicknesses 1.0, 1.5 mm (n=14). Again, specimens were divided into two divisions according to composite background shade into division (A2 and C3). The ceramic plates of each materials and thicknesses were optically connected with drop of distilled water to either two composite background shades. The color change ΔE between ceramic-composite assembly and ceramic plates was measured for all tested group. The data were analyzed with 3-way ANOVA followed by Bonferroni’s post-hoc test (α= 0.05). Results. ANOVA revealed that background color, ceramic type and thickness had a statistically significant effect on mean ΔL (p<0.05). The interaction between the three variables was not statistically significant (p=0.968). Conclusion. Zirconia reinforced lithium silicate ceramics could decrease the effect of color change of dark background more significantly than lithium disilicate glass ceramic.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3607
3615
https://edj.journals.ekb.eg/article_75982_96ef6da389fe735d6d1b50382c05a19b.pdf
dx.doi.org/10.21608/edj.2019.75982
Effect of CAD/CAM Technology System and Timing of Dentin Sealing Application on Hybrid Ceramic Endo-crowns Marginal Fit
Amany
Korsel
Ass. Prof in Fixed Prosthodontic Depart. Faculty of Dentistry. Tanta University
author
text
article
2019
eng
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3617
3625
https://edj.journals.ekb.eg/article_75983_8cd60b49cd2e9ce5d3ec67987bd75d18.pdf
dx.doi.org/10.21608/edj.2019.75983
Translucency of Ceramic Laminate veneers Fabricated with Different Ceramic Materials and Techniques
Amany
Korsel
Ass. Prof. Fixed Prosthodontic Faculty of Dentistry. Tanta University
author
text
article
2019
eng
Purpose: Comparing the translucency of various recent ceramic laminate veneers, with different fabricating techniques and luted with two types of adhesive systems. Materials and Methods: Total of 60 discs of 10 mm diameter and 0.7 mm thickness were fabricated, and divided into 4 main groups according to the ceramic materials (Vitablocs Triluxe Forte, VITA Enamic, Ceramill® Zolid and VITA VM®9) 15 specimens for each, that divided into 3 subgroups, with 5 specimens (control and two cement systems groups). All specimens were suspected to Translucency measuring procedures, using a spectrophotometer, to calculate its Translucency Parameter, and Contrast Ratio values before and after adding the cement systems. Result: F-test ANOVA revealed a significant difference in Translucency Parameter (TP) mean value when comparing the four materials in this study. The TP means were arranged in a descending way and showed that; Triluxe (No Adhesive) came in the 1st rank, and recorded the highest TP (3.5225±0.02217), followed by (RelyX Veneer) and the lower mean recorded by (RelyX Ultimate) for the same material where TP (3.44±0.01414). However Ceramill®Zolid (No Adhesive) recorded the 10th rank TP (2.84±0.0001), then (RelyX Veneer) followed by (RelyX Ultimate) came in the last rank as the least TP (2.78±0.00816). Conclusion: It was noticed that, within each ceramic material, the no adhesive application, showed the highest TP, then with RelyX Ultimate adhesive showed the least TP. The first rank of TP appeared in Trilux material.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3627
3635
https://edj.journals.ekb.eg/article_75986_53ed60bc049abb2a84eb35f64deadca1.pdf
dx.doi.org/10.21608/edj.2019.75986
Evaluation of Flexural and Compressive Strength for A Bioactive Restorative Material, Nanocomposite and Resin Modified Glass Ionomer: A Comparative Study
Tayseer
Maaly
Lecturer of Dental Biomaterials, Faculty of Dentistry, Zagazig University
author
Salwa
El Sayed
Lecturer of Operative Dentistry, Faculty of Dentistry, Zagazig University
author
text
article
2019
eng
Objectives: To perform a comparison between ACTIVA BioACTIVE restorative, Nano-filled dental composite and RMGIC for compressive and flexural strength. Materials and methods: A total of 60 specimens were made of (ACTIVA Bioactive-, Filtek Z350XT and Ketac Nano-100 RMGI), thirty specimens were prepared for compressive strength testing and the other 30 specimens were prepared for flexural strength testing using two split Teflon molds with different dimensions. All specimens were kept in distilled water for 24 h, then they were tested by universal testing machine. Results: The Filtek Z350XT recorded the highest values for compressive and flexural strength, while the lowest values were for Ketac Nano-100. There was no statistically significant difference between compressive strength values of Filtek Z350XT and ACTIVA. While there were significant difference among flexural strength values for all the materials. Conclusion: ACTIVA demonstrates mechanical properties comparable to dental composite and superior to traditional RMGIC.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3637
3641
https://edj.journals.ekb.eg/article_75987_0e0d6a4f5dc028a4b8777e94d94ab804.pdf
dx.doi.org/10.21608/edj.2019.75987
Effect Of Polyetheretherketone (PEEK) As Denture Base Material On Peri-Implant Bone Level Changes In Implant Bar Retained Overdenture Using CAD/CAM Technology
Hesham
Alameldeen
Associate Professor of Prosthodntics, Faculty of Dentistry, Future University
author
Sahar
Abdelbary
Associate Professor of Prosthodntics, Faculty of Dentistry, Misr University for Science and Technology
author
text
article
2019
eng
Objectives: This research was carried out to evaluate the effect of Polyetheretherketone (PEEK) as denture base material on peri-implant crestal bone level changes in edentulous patients rehabilitated with implant-supported primary-secondary bar overdenture and retained attachments attached the body of the bar constructed by CAD / CAM technology. Materials and Methods: Twenty completely edentulous patients complaining from insufficient retention of their mandibular denture were selected to participate in this study. All the patients were rehabilitated with an implant-supported bar overdenture. For All patients three implants (3.7mm) in diameter (11mm) in length were inserted in the interforamenal region using computer guided surgical template. Four months later, Cast bar with two semi precession attachment at the distal ends of the bar was constructed, The cast bar was scanned using bench laser scanner to obtain virtual model with the bar, the housing on the top of the bar and the female part of the attachment was designed using computer aided designing (CAD) the meld into wax by computer aided manufacturing (CAM). The CAD/ CAM wax pattern of housing and the female part of the attachments were transferred into acetal resin using the injection molded technique. Overdentures were constructed for all patients following the conventional technique. According to the denture base material, a toss coin was made to randomly divided the patients into two equal groups; group I received mandibular implant-retained overdenture were processed using heat cured acrylic resin, following the long curing cycle (heated at 78C° for eight hours), while for group II Polyetheretherketone (PEEK) lower overdenture was constructed, using the injection-molding technique. Radiographic evaluation of peri-implant bony changes was made using standardized long cone paralleling technique with custom made acrylic template and the Rinn-xcp at insertion, six, twelve and twenty four months were measured and statistically analyzed. The significant level was set at P ≤ 0.05P . ANOVA for repeated measures test was used to compare between follow up periods within groups and when statistically significant it was followed by simple main effect analysis with Bonferioni correction. One way ANOVA test was used to compare between groups at different follow up periods. Results. Both groups showed a statistically insignificant increase loss in crestal bone height around the implants. Although the data obtained from table1 revealed increase in the amount of bone changes for group I and Group II compared to group I during the follow up period statistical analysis of the data using ANOVA test for repeated measures revealed no significance difference(P ≥ 0.05) .Conclusion: CAD/ CAM technology and use of Polyetheretherketone (PEEK) as denture base material should be considered whenever possible to preserve the implant supporting structures in implant bar retained overdenture.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3643
3652
https://edj.journals.ekb.eg/article_75991_4144ea9ac39af78777bad7e7525b0f06.pdf
dx.doi.org/10.21608/edj.2019.75991
Three Dimensional Finite Element Analysis Of The Stresses Induced In Bone Surrounding Splinted & Un-Splinted Implants In Implant Retained Maxillary Obturators For Completely Edentulous Maxillectomy Patients
Mohamed
Abdel Aal
Lecturer of Removable Prosthodontics, Faculty of Oral and Dental Medicine, Beni-Suef University
author
text
article
2019
eng
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3653
3662
https://edj.journals.ekb.eg/article_75995_bb28745289822c2001119cedba54c9bf.pdf
dx.doi.org/10.21608/edj.2019.75995
Comparative Evaluation Of Physical Properties Of Conventionally Constructed Versus CAD/CAM Milled Frameworks For Kennedy Class I Partial Dentures
Maha
Mohamed
Lecturer in Removable Prosthodontics Department Faculty of Dentistry British University In Egypt
author
Gihan
Mohamed
Professor of Removable Prosthodontics Faculty of Dentistry Minia University
author
Nesma
Hassan
Teaching Assistant in Removable Prosthodontics Department Faculty of Dentisty British University In Egypt
author
text
article
2019
eng
Aim: The objective of this study was to compare the physical properties (retention, surface roughness, and wear) of conventionally constructed (pressed) bioHPP removable partial denture (RPD) frameworks versus computer aided designed - computer manufactured (CAD/CAM) RPD frameworks. Materials and Methods: Over standardized epoxy resin cast models, twenty frameworks were fabricated and divided equally into two groups, group A received ten conventionally fabricated (pressed) bioHPP frameworks and group B received ten CAD/CAM milled frameworks. Each framework was subjected to insertion/ removal cycles by using universal testing machine, (360, 720, 1080, 1440, 2116 cycles) representing time intervals baseline, three, six, nine- and twelve-months respectively, where retention, wear and surface roughness were measured before and after each time interval.Results: Group B(CAD/CAM) milled RPD frameworks results showed statistically significant difference with higher mean values than group A (pressed) RPD frameworks results in all measured parameters throughout all time intervals.Conclusion: Within the limitations of this study, it could be concluded that either with milled or pressed way of construction BioHPP remains a reliable material that could be used to construct a highly accurate RPD framework with acceptable physical properties.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3663
3670
https://edj.journals.ekb.eg/article_75998_d59cc095d357822e3ae0f999382ff8ad.pdf
dx.doi.org/10.21608/edj.2019.75998
Mini-Poll Coping As An Alternative Attachment In Tooth Supported Over-Denture Prosthesis
Ahmed
Elsherbini
Lecturer at Modern Sciences and Arts University, Egypt
author
text
article
2019
eng
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3671
3675
https://edj.journals.ekb.eg/article_76000_19d4fb51a9e7aa57b35e78bfea2d61e8.pdf
dx.doi.org/10.21608/edj.2019.76000
The effect of type of material and method of construction on the fracture toughness of different commercially available provisional restoration resins
Amr
El-Beialy
Lecturer Department of Orthodontics, Faculty of Dentistry, Cairo university
author
text
article
2019
eng
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3677
3685
https://edj.journals.ekb.eg/article_76003_be79baf6c65bdca8307088d60927595f.pdf
dx.doi.org/10.21608/edj.2019.76003
Biologic and prosthetic complications with acrylic and porcelain fixed hybrid prosthesis used for rehabilitation of edentulous mandible according to the “All on four” implant concept. A 3 year prospective study
Nasser
Shaheen
Associate Professor, Department of Removable Prosthodontics, College of Oral and Dental Surgery, Misr
University for Science and Technology, Egypt
author
Samer
Ali
Associate Professor, Department of Removable Prosthodontics, Faculty of Dentistry, Modern Science and Arts
University (MSA), Egypt
author
text
article
2019
eng
Purpose: The aim of this study was to evaluate biologic and prosthetic complications with acrylic and porcelain fixed hybrid prosthesis used for rehabilitation of edentulous mandible according to the “All on four” concept.Materials and methods: Ten edentulous patients received new maxillary and mandibular dentures. Four implants were inserted in the inter-foraminal area of the mandibular jaw according to the “All on four concept” and the implants were immediately loaded with lower denture. After 3 months, the patients were randomly assigned into two equal groups: Group I: received fixed ceramometal prosthesis (PFM), Group II; received metal acrylic hybrid prosthesis (MAP). Biological and prosthetic complications were measured for provisional dentures after 3 months of loading and for definitive prosthesis after 3 year. Results: The most common biological complication was increased pocket depth and bone loss which was significantly higher for PFM compared to MAP. Regarding provisional denture, the most common complication was denture fracture and prosthetic screw loosening. The most common complication for definitive prosthesis was crown fracture, teeth wear and prosthetic screw loosening. Crown fracture and teeth wear were higher in MAP and abutment screw loosening was higher in PFM.Conclusion: Within the limitation of the current study PFM and MAP could be used successfully for All on four implant rehabilitation of edentulous mandible. However, MAP may be advantageous than PFM regarding biologic complications (increased pocket depth and marginal bon loss) and abutment screw loosening. On the other hand, PFM may be preferred than MAP in terms of crown fracture and teeth wear/replacement.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3687
3698
https://edj.journals.ekb.eg/article_76006_add257167158ff60b12e8ef936e082da.pdf
dx.doi.org/10.21608/edj.2019.76006
Clinical and radiographic outcomes of polyetheretherketone (PEEK) hybrid prosthesis used for “All on four” rehabilitation of edentulous maxilla. A short-term case series study
Samer
Ali
Associate Professor, Department of Removable Prosthodontics, Faculty of Dentistry, Modern Science and Arts
University (MSA), Egypt
author
Dina
El Talawy
Associate Professor, Department of Removable Prosthodontics, College of Oral and Dental Surgery, Misr
University For Science and Technology, Egypt
author
text
article
2019
eng
Purpose: The aim of this study was to evaluate clinical and radiographic outcomes of polyetheretherketone (PEEK) hybrid prosthesis used for “All on four” rehabilitation of edentulous maxilla.Materials and methods: Six patients with atrophied edentulous maxillary ridges were managed by 4 implants according to the “All on four” protocol using computer guided surgery and flapless surgical approach. The existing maxillary dentures were placed immediately after modifications on the same day. After 6 months, the definite prosthesis consisted of screw retained milled BioHPP framework bonded to acrylic resin teeth and denture base. The prosthesis restored lost teeth, hard and soft tissues (hybrid fixed prosthesis). Plaque and gingival index, probing depth, implant mobility and bone loss (measured by standardized periapical radiographs) were evaluated after prosthesis delivery (T0), six months (T6) and 12 months (T12) after delivery.Results: Two implants failed in one patient resulting in 91.7% survival rate. Plaque index increased with time. No difference in gingival index, pocket depth, implant stability, and vertical bone loss between observation times was noted. Posterior implant showed higher plaque scores and pocket depth than anterior implants after 6 and 12 months and no significant difference in all other parameters between anterior and posterior implants was noted. Conclusion: Within the limitation of this study, PEEK hybrid prosthesis bonded to acrylic resin teeth and denture base can be used successfully to rehabilitate patients with atrophic maxilla according to “All on four” concept as it was associated with favourable clinical and radiographic outcomes after one year.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3699
3712
https://edj.journals.ekb.eg/article_76008_8095e6e6efc46c92675e116a3942b5d0.pdf
dx.doi.org/10.21608/edj.2019.76008
Evaluation of re-mineralization of initial enamel lesions using Nanohydroxyapatite and Coral Calcium with different concentrations
Ali
Abdelnabi
Researcher at the National Research Center, Egypt.
author
Nermeen
Hamza
Lecturer at MSA University
author
Maha
Othman
Lecturer of Operative Dentistry, Faculty of Dentistry, Cairo University, Egypt
author
text
article
2019
eng
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3713
3718
https://edj.journals.ekb.eg/article_76011_40d2efaa61ebe3ccc2aa92e5c167fd0d.pdf
dx.doi.org/10.21608/edj.2019.76011
Evaluation of antimicrobial Effectiveness of EndoVac and Laser for treatment of infected permanent root Canals
Amira
Alghazaly
Endodontics, Faculty of Dentistry, October 6 University, Giza, Egypt
author
Walaa
Alshareef
Microbiology and Immunity, Faculty of Pharmacy, October 6 University, Giza, Egypt
author
text
article
2019
eng
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3719
3726
https://edj.journals.ekb.eg/article_76012_694ad1097d5a4308a4062cd39b0d5d87.pdf
dx.doi.org/10.21608/edj.2019.76012
Efficacy of R-Endo and E3-ReRoot Retreatment Rotary NiTi Systems in Intracanal Filling Material Removal
Tarek
Elsewify
Endodontic Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
author
H.
Elhalaby
Endodontic Department, Faculty of Dentistry, Assuit University, Assuit, Egypt
author
text
article
2019
eng
Aim: To compare the effectiveness of R-Endo and E3-ReRoot retreatment rotary files in filling material removal and operating time.Materials and Methods: Twenty extracted distobuccal roots of maxillary first molars were decoronated to a standard length of 12 mm. Root canal preparations were done using Fanta Blue (Fanta; ShangHai, China) till 0.04/25. Matching gutta percha cones of 0.04/25 were used with Adseal resin sealer (Meta Biomed, Chungcheongbuk-do, Republic of Korea) in warm vertical compaction technique. Teeth were left in an incubator at 37 °C and 100% humidity for 30 days. Cone beam computed tomographic images of all roots were obtained to confirm three-dimensional filling of the root canal space. Roots were divided into two groups according to the file used in retreatment; group A using R-Endo (Micro-Mega, Besancon, France) and group B using E3-ReRoot (IMD; ShangHai, China). Time required to remove the filling material was recorded in seconds. Teeth were then split into two halves using hammer and chisel and remaining filling material was calculated using stereomicroscope at 4X original magnification. Statistical analysis was performed using One-Way ANOVA and significance level was set at 0.05.Results: E3-ReRoot was shown to be significantly more effective than R-Endo in intracanal filling removal. No significant difference was shown between both systems in the time needed to reach the working length. Conclusion: E3-ReRoot was more effective in intracanal filling removal although both systems failed to totally remove gutta percha and sealer remnants from the root canals.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3727
3733
https://edj.journals.ekb.eg/article_76016_899089af43062d802bf15b4735187156.pdf
dx.doi.org/10.21608/edj.2019.76016
Assessment of the Fracture Resistance of Novel Zirconia Reinforced Glass Ionomer in Comparison to Nano Hybrid Resin Composite Restorations
Rehab
Safy
Lecturer of Operative Dentistry, Faculty of Dentistry, Suez Canal University, Egypt
author
Heba
Abd Elmohsen
Lecturer of Operative Dentistry, Faculty of Dentistry, Suez Canal University, Egypt
author
text
article
2019
eng
Objective: Evaluation of the influence of newly introduced Zirconia reinforced glass ionomer when used as a base or as a restorative material on fracture resistance and fracture pattern of class II restorations.Methodology: Forty extracted, intact mandibular third molars with standardized MO cavities were randomly assigned into four groups according to the type restorative material: The control group was restored using nano hybrid resin composite (RC), Zirconia reinforced restorative glass ionomer group was used for restoring Zr group, resin modified glass ionomer cement as a base material below the resin composite restorations in RC/RMGI group and Zirconia reinforced restorative glass ionomer as a base material below the resin composite restorations in group RC/Zr group. After thermal cycling fracture resistance of the specimens was tested by the application of load in a universal testing machine. Fracture pattern of each specimen was also evaluated. Mean fracture resistance values for each group were calculated and compared using one way ANOVA (P = 0.05). Results: The highest mean load necessary to fracture the specimens was found in RC/RMGI followed by RC/Zr and RC groups respectively. While the lowest mean value was found in Zr group. The highest frequency of specimens’ reparability was found in Zr group followed by RC/Zr and RC groups respectively. While the least frequency of reparability was found in RC/RMGI group.Conclusions: Within the limitations of the current study, it could be concluded that despite higher fracture strength values of RMGIC as a base material below the resin composite restorations, clinicians might prefer using of Zirconomer Improved® as either a restoration or a base material as its fracture patterns are repairable.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3735
3744
https://edj.journals.ekb.eg/article_76018_40c35687664dbb7b7236ca694a8b05d9.pdf
dx.doi.org/10.21608/edj.2019.76018
Fracture Resistance of Endodontically Treated Mandibular Molars Restored With Two Endocrown Designs (An In-Vitro Study)
A.
Abo El Fadl
Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt; Guest Researcher,
Oral Technology Department, Bonn, Germany
author
T.
Elsewify
Department of Endodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
author
text
article
2019
eng
Aim: To evaluate the effect of two endocrown designs on the fracture resistance of endodontically treated mandibular molars.Materials and methods: Fourteen mandibular molars were endodontically treated and randomly divided into two groups according to the endocrown design; group (A) Axial extension (n=7) and group (B) Circumferential extension (n=7). Endocrown preparation was done followed by CAD/CAM endocowns design and fabrication using lithium disilicate glass ceramics. Endocrowns were cemented using a standardized protocol. All samples were subjected to fracture resistance test using a universal testing machine and the maximum loaded was recorded. Statistical analysis was performed using One-Way ANOVA and significance level was set at 0.05.Results: Endodontically treated mandibular molars with axial extension endocrowns showed significantly higher fracture resistance than those with circumferential extension. Conclusions: Axial extension endocrown design is recommended to restore endodontically treated mandibular molars.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3745
3750
https://edj.journals.ekb.eg/article_76020_6955741ef20ecd70212b4a162036c271.pdf
dx.doi.org/10.21608/edj.2019.76020
ELECTROMYOGRAPHIC EVALUATION OF IMPLANT OVERDENTURE RETAINED BY TWO DIFFERENT TYPES OF ATTACHMENTS (RANDOMIZED CONTROL TRIAL)
Sahar
Abdel-Bary
Associate Professor of Prosthodntics, Faculty of Dentistry, Misr University for Science and Technology
author
Hesham
Alameldeen
Associate Professor of Prosthodntics, Faculty of Dentistry, Future University
author
text
article
2019
eng
The objective of the present study was to evaluate and compare the influence of two different types of attachments on the masticatory function of complete denture wearers through studying the electromyographic (EMG) activity of the masseter and anterior fibers of temporalis muscles.Material and methods: Fourteen completely edentulous patients with problematic existing mandibular dentures received new conventional complete dentures. Two implants were installed in the mandibular canine regions. After verification of Osseointegration. Patients were randomly divided into two groups by using closed envelope according to the type of attachments used (ball and locator) were installed onto each implant. Electromyographic (EMG) activity of masseter and anterior fibers of temporalis muscles was measured during chewing hard and soft food with conventional dentures before implant placement, one month and three months after implant retained overdentures with the two types of attachments. Data was collected and statistically analyzed.Results: The results obtained from thisstudy revealed a statistically significant increase in the muscles activity after attachment of mandibular dentures onto the implants in the studied groups. The highest activity values were reported for the locator attachment group followed by ball attachment however, the least values were recorded for the conventional complete denture. Nevertheless, the comparison between the two groups at the end of follow up period revealed a statistically insignificant difference .Conclusion: Muscles activity significantly increased after implant treatment. Thus, implant treatment greatly improves oral function. The design of implant attachments did not affect significantly the muscle activity; as no significant differences were observed among the studied attachments (Ball and locator).
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3751
3761
https://edj.journals.ekb.eg/article_76021_97e5acc67916f937a2a232c009c352f6.pdf
dx.doi.org/10.21608/edj.2019.76021
Microtensile bond strength of a self-etch adhesive used as a carrier for a remineralizing agent
Mona
Ghoneim
Associate Professor of Restorative Dentistry, Faculty of Dentistry, Alexandria University, Egypt
author
Moustafa
Aboushelib
Professor of Biomaterials, Faculty of Dentistry, Alexandria University, Egypt
author
text
article
2019
eng
Objectives: resin adhesive could be used as a carrier of nano-hyrdoxy apatite particles added to treat early enamel caries. The aim of this study was to evaluate microtensile bond strength of a remineralizing adhesive to early carious enamel lesionMethods: an artificial caries model was used to induce early non cavitated enamel caries-like lesion in maxillay centrals. Nano hydroxyapatite particles (nHA) were applied in two forms to a self-etch resin adhesive: particles were directly added to resin adhesive or silanated before addition. Unmodified adhesive was used as control. Micro-tensile bond strength (MTBS) was performed to evaluate bond strength to demineralized enamel after application remineralizing resin adhesive (n=20, α=0.05). Scanning electron microscopy (SEM) was performed to assess mode of failure and to study adhesive enamel interface. Results: Direct addition of nano-particles resulted in significant reduction (F=32, P<0.001) in MTBS (12 MPa±3.8) compared to addition of silanated particles (24 MPa ± 3.2) which presented comparable values to the control group (26 MPa ± 4.1). SEM image analysis revealed adhesive failure observed for directly added particles while the other two groups demonstrated cohesive failure observed in the resin adhesive. Direct addition of nHA resulted in partial remineralization of enamel (42% recovery in calcium content. Conclusions: Self-etch resin adhesive could be used as a carrier for nano hydroxyapatite particles without compromising bond strength to early caries-like enamel lesions.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3763
3768
https://edj.journals.ekb.eg/article_76022_6b52b1a47e9a8dcbdd9d8d9b02833224.pdf
dx.doi.org/10.21608/edj.2019.76022
Influence of the thickness of enamel layer on overall color of composite restoration using different polychromatic composite resins
Layal
Jbara
MSc student, Operative and Esthetic dentistry, Faculty of Dentistry, Beirut Arab University, Lebanon
author
Mona
Ghoneim
Associate Professor of restorative dentistry, faculty of dentistry, Alexandria university, Egypt
author
Hala
Ragab
Professor of Operative and Esthetic dentistry, Division Director, Department of Restorative Sciences, Faculty of
Dentistry, Beirut Arab University, Lebanon
author
text
article
2019
eng
The purpose of this study was to calculate and study the color components (Chroma and Value) and translucency of resin composites at different thicknesses. Method: resin composites shade A1 were used in this study; Filtek Z350 XT 3M (FT), Harmonize Kerr (HK), and Empress Direct Ivoclar Vivadent (ED). All samples were fabricated with same dentin thickness of 2mm, while the enamel samples were prepared in two thickness; 0.5mm and 1mm. Transparency parameter evaluation was done by measuring the CIELAB parameters of each sample once against white background and once against black. ∆E was used to evaluate the change in color of composite resin at different thicknesses. One-way ANOVA and Tukey HSD test were used to analyze the descriptive statistics. Pearson correlation coefficient was used to conclude a relation between thickness and chroma; and thickness and value. Results: There was a significant difference in translucency in all composite groups at enamel thickness 0.5 and 1mm. ∆E showed significant difference when comparing group FT with ED and HK, but no significant difference when comparing groups ED and HK. As for chroma, groups ED and FT showed a decrease in chroma as thickness increased and the results were significant at (p<0.05), while groups HK showed increase in chroma but the results were insignificant. Conclusion: As thickness increases the translucency and chroma of the composite resin decreases.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3769
3775
https://edj.journals.ekb.eg/article_76023_f4f4e10136c88f076ff76431191364f0.pdf
dx.doi.org/10.21608/edj.2019.76023
A study to compare adhered oral flora to soft liner and conventional denture base surface in complete denture patients
Ayman
Elawady
Researcher in Removable and Fixed Prosthodontics Department, National Research Center
author
Seham
Mohamed
Lecturer in Removable Prosthodontics Department, Ahram Canadian University
author
Nassif
R.
author
text
article
2019
eng
Background: Denture base materials are subjected to sorption, a process of absorption and adsorption of liquids depending on the environmental conditions, also their fitting surface is subjected to microbial adhesion due to surface irregularities. Soft silicon liners are usually used with removable appliances to decrease load concentration on the hard and soft tissues. Silicon liners also undergo fluid sorption and microbial adhesion.Aim: This study was carried out to assess the effect of standardizing the oral hygiene conditions on the microbial load difference between conventional acrylic denture bases and silicon soft relining material (Mucopren soft) used to reline mandibular complete dentures in atrophied mandibles. Methods: Conventional complete dentures were constructed for 25 patients with flat atrophic mandibular ridges to be used for two weeks, salivary swabs were collected to evaluate oral flora attached on the fitting surface of the denture base and the buccal vestibule, soft liner was applied for all patients mandibular denture surfaces and the same approach was repeated after two weeks of the liner use. Results: Microbial load was found to be significantly higher in the fitting surfaces of the silicon soft liner, than in the conventional acrylic base fitting surfaces.Conclusion: Even under controlled oral conditions, Mucopren soft silicon liner incorporates greater microbial load than acrylic material thus, subjecting patients to numerous infections.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3777
3786
https://edj.journals.ekb.eg/article_76025_94a0dafc8dfe2c5fd723be26a5afa5ac.pdf
dx.doi.org/10.21608/edj.2019.76025
Digital PEEK framework and patient satisfaction compared to conventional metal framework in removable partial dentures. A clinical trial
Seham
Mohamed
Lecturer in Removable Prosthodontics Department, Ahram Canadian University
author
Hashem
Rasha
PhD. of Removable Prosthodontics
author
text
article
2019
eng
Introduction: Utilization of removable partial dentures (RPD) is inevitable in some patients that are not indicated for any other treatment option, thus patient satisfaction with this line of treatment is of great importance. However, a notable need exists to advance materials and fabrication technologies due to the undesirable health outcomes linked with current RPDs. Aim: In this study patient satisfaction with conventionally manufactured metal RPD framework, was compared with their satisfaction using digitally milled PEEK (Juvora) framework. Methods: Ten patients were selected having class I partially edentulous mandibles. A conventional metal framework RPD was constructed for each patient, then another RPD with milled PEEK framework was digitally fabricated for each one of them. Each patient had the chance to use each denture for three months, then questionnaires were filled to assess their satisfaction. Results: The questionnaires were statistically analyzed and resulted in more patients’ satisfaction with the digital PEEK framework RPD, than with conventional metallic RPD framework.Conclusion: PEEK material increases patients’ satisfaction with RPDs than the conventional metal framework material, thus decreasing patients’ complaints from removable appliances.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3787
3794
https://edj.journals.ekb.eg/article_76027_dfff63c26f177f75a263a93a1e2e2fdb.pdf
dx.doi.org/10.21608/edj.2019.76027
Evaluation of the thickness and depth of penetration of icon into the artificial enamel white spot lesion
Abdallah.
Abd Alhady
Lecture in Operative Department, Faculty of Dental Medicine, Al-Azhar University (Cairo).
author
Hamed
Mohamed
Lecture in Operative Department, Faculty of Dental Medicine, Al-Azhar University (Cairo).
author
text
article
2019
eng
This research was designed to compare the thickness and the depth of penetration of two resin-based materials (Icon and one-step self-etch adhesive (Single Bond Universal)) in artificial white spot lesion (WSL) created on caries-free molar teeth, without and with surface treatment prior application of the resin-based materials at different storage time (one day, one week and one month). The 126 samples were randomly divided into three equal main groups (n=42) according to the resinous material (M); Group 1 (M1) was considerate to be control group. Group 2 (M2) was restored with Icon. Group 3 (M3) was restored with Single Bond Universal. Each group was divided into two equal subgroups (n=21) according to the surface treatment (W); Where the first subgroup (W1) was subjected to surface treatment while the second subgroup (W2) was without surface treatment. The samples were further divided into three divisions (n=7) according to the storage time (S). Division 1 (S1) was stored for one day. Division 2 (S2) was stored for one week. Division 3 (S3) was stored for one month. Each resin-based material was applied after creation of white spot lesion, according to the manufacture instruction. Buccal and lingual surface of each sample was used to measure the thickness of the resin-based materials using Optical profilometer while confocal laser scanning microscopy (CLSM) was used to measure the depth of penetration. The result of this study reveals that: the surface treatment prior application of Icon group improve the degree of penetration depth to get the highest value compared with the other groups while the thickness of the untreated surface prior application of Icon groups gives the thickest value compared with the thickness of the other groups. Conclusion; Icon is the best choice for treatment of (WSLs).
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3795
3803
https://edj.journals.ekb.eg/article_76028_6a5a07beba5acdc8c5edc808a579b418.pdf
dx.doi.org/10.21608/edj.2019.76028
Effect Of Different Base Materials On The Micro Leakage And Fracture Resistance Of Recent Ceramic Inlay Restorations
Ola
Barakat
Associate Professor, Department of Operative Dentistry, Faculty of Oral and Dental Surgery, Misr University for
Science and Technology. Egypt
author
Noha
Mohammed
Lecture, Department of Fixed Prothodontic, Faculty of Oral and Dental Surgery, Misr University for Science and
Technology. Egypt
author
text
article
2019
eng
Purpose: The purpose of this study was to evaluate the effect of three different base materials (GIC, Chemfill rock, and SDR,) on microleakage, fracture resistance, and color stability of two ceramic inlays (E max and Vita suprinity).Materials and methods: Sixty extracted premolars were prepared for Class II inlay MOD. For microleakage test thirty teeth divided into three groups (n=10); group (A): restored with (GIC). Group (B): restored with Chemfill rock. Group (C): restored with SDR. After thermocycling the microleakage was evaluated by scores. For evaluation of fracture resistance and color stability, the remaining thirty teeth were divided into two groups(n=15) Group (1): The teeth restored with Emax inlay. Group (2): restored with Vita Suprinity inlay. Each group was subdivided into three subgroups(n=5); Subgroup (I): based with (GIC). Subgroup (II): based with Chemfill Rock. Subgroup (III): based with SDR. Results: For microleakage test; SDR base had stage zero leakage, leakage was higher in GIC base. For fracture resistance test; there is statistically significant high mean of fracture resistance in SDR base. On the other hand there is no statistically significant difference as fracture resistance between E-max, and Vita Suprinity restoration. For color stability test; there is statistically significant difference high mean of color difference in SDR base with p-value <0.05. On the other hand there is no statistically significant difference between E-max, and Vita Suprinity restoration. Conclusion: SDR is the best base regarding microleakage, color stability and fracture resistance. While there is no significant difference between Emax and Vita Suprinity restorations.in color stability and fracture resistance.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3805
3816
https://edj.journals.ekb.eg/article_76029_18113b6c5648a97f0996b8bf1c509e51.pdf
dx.doi.org/10.21608/edj.2019.76029
The effect of setting-up of artificial teeth in the neutral zone on EMG and Occlusal force equilibration in mandibular two implant overdentures
Mohamed
Abdel Aal
Lecturer of Removable Prosthodontics, Faculty of Oral and Dental Medicine, Beni-Suef University
author
text
article
2019
eng
Purpose: This study was conducted to evaluate the effect of neutral zone concept on EMG & % occlusal force distribution in mandibular implant overdentures.Methodology: Twelve completely edentulous patients were selected from the out-patient clinic, Faculty of Dentistry, Beni-suef University. Patients were randomly divided into Group (I) & (II) according to the way of artificial teeth set-up in the complete dentures. Group (I): Patients had received mandibular two implant overdenture constructed with the artificial teeth set-up over the crest of ridge. Group (II): Patients had received mandibular two implant overdenture constructed according to the neutral zone concept.Two implants were installed in areas of mandibular canines according to the two stage surgical protocol. Ball attachments were inserted onto the implants after osseointegration. The previously constructed dentures were used for direct pick up procedures. Dentures of both groups were inserted into the patients’ mouth.Evaluation of EMG: Evaluation of EMG activity of the Masseter and Temporalis muscles was evaluated during clenching, chewing of soft food, chewing of hard food at denture insertion and one month after.Evaluation of Occlusal force Equilibration: The % of occlusal force distribution was evaluated for the dentures in the two studied groups with the aid of T-Scan device at insertion after occlusal adjustment by the articulating paper; two weeks after denture insertion and one month after T- scan analysis.Conclusions: Within the limitation of the present study the following was concludedImplant overdentures constructed with Neutral Zone concept may have better occlusal force distribution on the denture surfaces and better EMG records than dentures with the conventional set-up of teeth.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3817
3827
https://edj.journals.ekb.eg/article_76030_76b15a3c17df8547e3b32ea8e94be160.pdf
dx.doi.org/10.21608/edj.2019.76030
Comparative evaluation of the masticatory muscleS activity with CAD/CAM versus conventional complete denture using electromyography
Mahmoud
Mohamed
Lecturer of Removable Prosthodontics, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt
author
Nasser
Shaheen
Associate Professor, Department of Removable Prosthodontics, College of Oral and Dental Surgery, Misr University
for Science and Technology, Egypt
author
text
article
2019
eng
Purpose: To evaluate in-vivo the effect of CAD/CAM constructed dentures on the masticatory muscles activity using electromyography in comparison to conventionally constructed dentures.Materials and Methods: Fourteen completely edentulous patients were randomly allocated to two equal groups. Patients in the first group received conventionally constructed complete dentures and patients in the second group received complete dentures constructed using CAD/CAM technology. After 30 days of denture use the anterior temporalis and superficial masseter muscles activity were measured by EMG. A cross over was performed for patients with conventional denture to CAD/CAM and vice versa and the dentures were used for further 30 days, after which measurements of anterior temporalis and superficial masseter muscles activity were taken using EMG. Electromyographic data was recorded and analyzed, mean values were compared by independent t-test to compare between the two groups as regard to muscle activity. Results: There was a significant difference in the activity of the masseter muscles and the anterior temporalis muscles for the patients received CAD/CAM denture in comparison to those received the conventional denture, after 30 days of denture use (p < 0.05). Conclusion: CAD/CAM constructed complete dentures produced higher muscle activity if compared to conventionally constructed complete dentures.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3829
3836
https://edj.journals.ekb.eg/article_76031_5b8dc8702100e1f74a8a3db2da8ddf25.pdf
dx.doi.org/10.21608/edj.2019.76031
Efficacy of Combined Use of XP-endo shaper and XP-endo Finisher in Cleaning Simulated Internal Root Resorption Defects: An In-Vitro Comparative Study
Dalia
Moukarab
Lecturer of Endodontics, Department of Endodontics, Faculty of Dentistry, Minia University
author
text
article
2019
eng
Aim: Evaluate the efficacy of the combined use of XP shaper and finisher in cleaning simulated internal root resorption defects in comparison to the conventional passive ultrasonic irrigation using stereomicroscope.Materials and methods: The root canals of 90 freshly extracted human mandibular premolars were prepared using Protaper up to F4 and the teeth were split longitudinally and semicircular cavities (simulated internal root resorption cavities) were prepared in the canal wall on each half of the roots, then randomly assigned into two experimental groups (n=40) according to the cleaning technique groups (A) cleaned using passive ultrasonic irrigation , group (B) cleaned using XP-endo shaper followed by XP-endo finisher , five specimens were assigned to serve as negative control and five more were assigned to serve as positive control. Colored gelatin material (CGM) was prepared and applied into the semicircular cavities except for the negative control which did not receive (CGM). The root halves were reassembled creating a circular simulated resorption cavity within the root canal. Specimens were cleaned according to the group they were assigned to except for the positive control which did not receive any further treatment. All the specimens were disassembled and the residual CGM was examined under a stereomicroscope at 10x magnification and calculated as percentage of residual CGM to total area of the IRR cavity by using image analysis software and the data were statistically analyzed with one- way ANOVA test and significance level was set at P> 0.05.Results: None of the tested methods could completely remove the CGM from the simulated IRR cavities. Group B showed lower mean percentage of residual CGM than did group A (P> 0.041).Concussion: within the limitations of this study XP-endo shaper followed by XP-endo finisher was more effective in cleaning inaccessible internal root resorption defects than PUI.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3837
3845
https://edj.journals.ekb.eg/article_76032_e3806f9a2e7c46ea672769484634f0c0.pdf
dx.doi.org/10.21608/edj.2019.76032
A comparative analysis of cyclic fatigue of a new preheated machined CM wire endodontic files after exposure to different irrigants
Hala
Khalil
Lecturer of Endodontics Faculty of Dentistry The British University in Egypt
author
Sara
El Mallah
Lecturer of Endodontics Faculty of Dentistry Fayoum University
author
text
article
2019
eng
AIM: Analysis of cyclic fatigue of a new preheated machined CM wire MPro endodontic files after exposure to lycopene, curcumin and Soduim hypochlorite for two different immersion observation periods; 5 minutes and 10 minutesMethodology: Eighteen size 20 MPro files were used in this study, divided into three groups of 6 files each according to irrigant used: Group I lycopene, Group II curcumin and Group III Soduim hypochlorite. All files were immersed in irrigants for either 5 or 10 minutes. The cyclic fatigue tess were performed on all files of both immersion periods using a static cyclic fatigue testing device, which have an artificial stainless steel canal and tested using a custom-made static cyclic fatigue testing apparatus. Parameters recorded were time to fracture, number of cycles to failure (NCF) and mean length of fractured segments.Results: Results showed no statistically significant difference between the different irrigants at the two observation periods and within the same group regarding time to fracture, number of cycles to failure (NCF) and mean length of fractured segments.Conclusion: All tested irrigants lycopene, curcumin and Soduim hypochlorite had same effect on cyclic fatigue of the preheated machined CM wire Mpro endodontic files when used for 5 or 10minutes.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3847
3853
https://edj.journals.ekb.eg/article_76033_c0c3a59095ded1c4d6dfcb0d7b00edf8.pdf
dx.doi.org/10.21608/edj.2019.76033
Assessment of Push Out Bond Strength and Cement Thickness for Oval Root Canals Restored with Different Post Techniques
Khaled
Elbanna
Assistant Professor, Fixed Prosthodontics Division, Oral and Maxillofacial Department, Faculty of Dentistry,
Umm Al-Qura University
author
Zeinab
Emam
Associate Professor, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University, Egypt, Associate
Professor, Fixed Prosthodontics Division, Oral and Maxillofacial Department, Faculty of Dentistry, Umm Al-Qura
University
author
Shereen
El Sayed
Associate Professor, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University, Egypt, Associate
Professor, Fixed Prosthodontics Division, Oral and Maxillofacial Department, Faculty of Dentistry, Umm Al-Qura
University
author
text
article
2019
eng
Objectives: The aim of the present study was to evaluate the push out bond strength of fiber posts to oval shaped root canals using different post techniques and correlation of bond strength values to different cement thicknesses at different post level in different post techniques.Methods: A total of thirty-two recently extracted human mandibular first premolars with oval root canals were selected and stored in normal saline solution. The teeth were horizontally sectioned 2 mm coronal to the cementoenamel junction with a double-faced diamond disk in a slow-speed handpiece with copious coolant. Root canal treatment was done for all teeth using a standardized technique. The teeth were then randomly divided into four equal groups (n=8) according to the post and core system used: Group I: Single circular post technique, Group II: Relined post technique, Group III: Double circular post technique, Group IV: Oval post technique. For each sample, the roots were cut horizontally, perpendicular to the long axis of the root using low speed diamond saw under water coolant to obtain three 2 mm ± 0.1 thick root specimens representing cervical, middle and apical third of the root. The resin cement thickness around each specimen obtained after slicing were measured using scanning electron microscope (SEM) at eight standardized points around the circumference of the slice; between the canal wall and the fiber post perimeter. Each root slice was subjected to compressive loading at a crosshead speed of 1 mm/min via a computer controlled Universal testing machine to record the maximum failure load in Newton. The push out bond strength was calculated by dividing the recorded peak load by the surface area of each slice. Results: As regards to the mean push out bond strength values for the post techniques, there was a statistically significant difference between mean push out bond strength of different post techniques where oval post technique showed the statistically significant highest mean push out bond strength. Relined technique showed statistically significant lower mean value followed by double circular technique. Single circular technique showed the statistically significantly lowest
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3855
3870
https://edj.journals.ekb.eg/article_76034_612d142b739294e3cb82c33ac6c4cccb.pdf
dx.doi.org/10.21608/edj.2019.76034
Marginal Gap Distance and Fracture Resistance of Lithium Disilicate and Zirconia-Reinforced Lithium Disilicate All-Ceramic Crowns Constructed With Two Different Processing TechniquesWith Two Different Processing Techniques
Shereen
El Sayed
Associate Professor, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University, Egypt, Associate
Professor, Fixed Prosthodontics Division, Oral and Maxillofacial Department, Faculty of Dentistry, Umm Al-Qura
University
author
Zeinab
Emam
Associate Professor, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University, Egypt, Associate
Professor, Fixed Prosthodontics Division, Oral and Maxillofacial Department, Faculty of Dentistry, Umm Al-Qura
University
author
text
article
2019
eng
Statement of problem: The microstructure and processing methods used to produce any dental restoration might affect the final mechanical outcomes as well as the clinical success. Objectives: The purpose of this study was to evaluate the fracture resistance of lithium disilicate and zirconia reinforced lithium disilicate ceramic crowns constructed using two processing techniques after fatigue loading namely, CAD/CAM technique and pressing technique. The marginal integrity of the crowns was examined before and after fatigue loading. Methods: A total number of thirty-two freshly extracted maxillary first molars were collected. The teeth were chosen to be of similar bucco-lingual and mesiodistal dimensions. The teeth were mounted vertically into epoxy resin templates. Full coverage all-ceramic preparation was performed for all samples using a standardized technique. The prepared teeth were randomly divided into four equal groups (n=8) according to the all-ceramic materials and technique used for crown fabrication as follows: Group I: IPS e-max CAD(EC): eight prepared teeth were restored with machinable lithium disilicate glass ceramics. Group II: Celtra Duo(CD): eight prepared teeth were restored with machinable zirconia-reinforced lithium disilicate glass ceramics. Group III: IPS e-max Press (EP): eight prepared teeth were restored with pressable lithium disilicate glass ceramics. Group IV: Celtra Press (CP): eight prepared teeth were restored with pressable zirconia-reinforced lithium disilicate glass ceramics. The crowns were cemented using self-adhesive resin cement (Rely X Unicem). Vertical margin gap distance of all the crowns was measured using a stereomicroscope. Following vertical marginal gap distance measurements, the samples were subjected to fatigue cyclic loading for 60000 cycles which is equivalent to six months clinical service. The vertical marginal gap distance for all samples were subsequently remeasured after the fatigue loading testing. Fracture resistance test was done using universal testing machine. The fracture load was recorded in Newton. Data was collected, tabulated and statistically analyzed. Results: One-way ANOVA test for comparison between the fracture resistance of the four types of all-ceramic crowns revealed that there was a statistically significant difference between mean fracture resistance of different all ceramic materials and techniques used in this study (P-value <0.001). For the marginal gap distance either before or after fatigue cyclic loading; there was a statistically significant difference between the four all ceramic crowns used in this study.Conclusions: CAD/CAM techniques showed better fracture resistance values than pressable techniques, even if the same material was used. The addition of zirconia to lithium disilicate ceramics did not improve the fracture resistance of all ceramic crowns. Pressable processing techniques showed better vertical marginal gap distance than CAD/CAM techniques for both ceramic materials used. Cyclic loading resulted in significant increase in the vertical marginal gap distance for all ceramic crowns using different processing techniques.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3871
3881
https://edj.journals.ekb.eg/article_76035_b4cd129dcbb74523816e890ae55e2ad2.pdf
dx.doi.org/10.21608/edj.2019.76035
Effect of Synthesized Bis-GMA and UDMA Nanofibers on Cuspal Flexure, Microhardness, Wear, Surface Roughness and Color Stability of Experimental Resin-Composites
Samy
El-Safty
Lecturer, Department of Dental Biomaterials, Faculty of Dentistry, Tanta University, Tanta, Egypt
author
El-Refaie
Kenawy
Professor, Department of Chemistry, Director of Technology Transfer office, Faculty of Science, Tanta University,
Tanta, Egypt
author
text
article
2019
eng
Objective: To study the cuspal flexure (CF), Vickers microhardness (HV), three-body wear (W), surface roughness (SR) and color stability (CS) of experimental resin-composites reinforced with Bis-GMA and UDMA nanofibers synthesized by electrospinning technique.Materials and methods: Bis-GMA (Bis-GMA+TEGDMA+PEGDMA) and UDMA (UDMA+PEGDMA) nanofibers were synthesized by wet electrospinning technique and characterized by Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). After being ball-milled to a nanoscale size (< 100 nm) in a ball-milling machine (Retsch – PM 400, Haan, Germany), these nanofibers were added to a prepared experimental resin-composite. This study was divided, according to the percent and type of added nanofibers, into eight groups (n=10/group except for color stability n=11): one control group, three groups reinforced with 7, 11 and 15 wt% Bis-GMA nanofibers and four groups reinforced with 7, 11, 15 and 20 wt% UDMA nanofibers. For each of these groups, CF, HV, W, SR and CS were studied. CF was studied by the digital image correlation method which analyzes the displacement of an object using a USB digital microscope with a built-in camera (COMET xS, Steinbichler Optotechnik GmbH, Neubeuern, Germany). HV was measured according to the ASTM E-384:1999 using a Digital Display Vickers Microhardness Tester (ZHVµ Micro Vickers Hardness Tester, Indentec Hardness Testing, Zwick Roell Co., Ltd. Atlanta, USA). W testing was carried out according to ISO/TS 14569:2001 using a custom-made cusp-on-disc sliding machine. Measurement of SR was performed according to ISO 25178-2:2012 and CS testing was carried out according to the regulations of ISO 4049; 2009 using a portable reflective spectrophotometer (X-Rite, model RM200QC, Neu-Isenburg, Germany). Data were collected and submitted to One-way ANOVA and post-hoc Tukey and Dunnett’s T3 tests with the significance level set at (p ≤ 0.05). Results: Pure forms of Bis-GMA (70-100 nm) and UDMA (50-100 nm) nanofibers were confirmed by SEM and FTIR. One-way ANOVA revealed significant differences between studied groups for CF, HV, W and SR (p = 0.001) but not for CS (p = 0.068). For both types of nanofibers, compared to the control group, reinforced groups showed lower CF, HV and SR and greater W results. For CS, there was no consistent trend of results of experimental groups that were comparable to that of control group. Within the range of added nanofibers (7-20 wt%), Bis-GMA nanofibers exhibited more favourable HV and W results than UDMA nanofibers, while the reverse was the case for CF and SR. Both nanofibers exhibited comparable CS results.Clinical Significance: A resin-composite reinforced with such nanofibers showing improved CF and unfavorably lower HV and more W should be used as a base layer and covered with a layer of another resin-composite with enhanced surface properties.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3883
3898
https://edj.journals.ekb.eg/article_76036_86a188db9737b4a616babf0f5a8ea660.pdf
dx.doi.org/10.21608/edj.2019.76036
A Comparative Study to Assess the Post Operative Pain Intensity Following Non-Surgical Root Canal Treatment and Pulp Revascularization in Mature Necrotic teeth
Mohamed
Tawfik
Lecturer of Endodontics, Faculty of Dentistry, Fayoum University
author
Dina
Morsi
Lecturer of Endodontics, Faculty of Dentistry, Cairo University
author
Lamiaa
Ibrahim
Associate Professor of Endodontics, Faculty of Dentistry, Fayoum University
author
text
article
2019
eng
Introduction: Traditionally necrotic permanent teeth are managed through the conventional procedures of root canal treatment which is known to weaken the remaining tooth structure. Regenerative Endodontic Procedures so have emerged as an alternative to the conventional techniqueAim of the study: The aim of the present study was to compare the post-operative pain intensity following non-surgical root canal treatment and revascularization procedures in mature necrotic teeth.Materials and methods: Twenty-four adult participants with 30 necrotic mature maxillary anterior teeth were randomly divided into two groups according to the treatment modality; control group: non-surgical root canal treatment; Intervention group: Blood clot revascularization technique. At the first visit in the two groups, all patients recorded their pain level preoperatively using a numerical rating scale (NRS). Mechanical preparation was performed with the ProTaper Universal Ni Ti system up to #F4 file. Double antibiotic paste (DAP) was prepared and injected and the cavity was temporarily sealed. At the second visit, three weeks later, the patients were assigned according to the randomization. The degree of spontaneous postoperative pain was measured using NRS after 6, 12, 24, and 48 hours.Results: Independent t -test between both groups; showed a highly significance difference, p value<0.05 at 6, 12, and 24 hours postoperatively while in the 48 hours there was no significant difference between both groups, p value >0.05.
Egyptian Dental Journal
The Egyptian Dental Association (EDA)
0070-9484
65
v.
Issue 4 - October (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)
no.
2019
3899
3905
https://edj.journals.ekb.eg/article_76037_59de09f6f759cf6a2f8460841950ea5d.pdf
dx.doi.org/10.21608/edj.2019.76037