scholarly journals Effect Of Accelerating Aging On Retention And The Release Period Of Clips In A Bar Retained Maxillary Implant Overdenture

2021 ◽  
Vol 8 ◽  
Author(s):  
Dalia El naggar ◽  
Ahmed Mohamed Alam-Eldein ◽  
Maha Mostafa Halim ◽  
Hoda Mohammed Amin Rashad
Keyword(s):  
Testing Machine ◽  
Accelerated Aging ◽  
The Other ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Retention Loss ◽  
Significant Difference ◽  
Implant Overdenture

Objectives: This study was made to detect the effect of accelerating aging on retention and measuring the release period of clips in a 2 and 3 bar retained maxillary implant overdenture. Materials and Methods: Four implants were placed in two maxillary edentulous epoxy models. One model had two bar attachments with two clips overdenture while the other model had three bar attachments with three clips in the overdenture. Retention and release period of the clips were checked before applying insertion removal cycles. Retention was measured using universal testing machine after 540 cycles (6 months) and 1080 cycles (1 year) of insertion removal on a chewing simulator.Results and Conclusions: There was a significant difference in retention and release period between two bars and three bars implant retained maxillary overdentures. A significant difference was also seen in each group after accelerated aging. Therefore, the three bar implant retained overdenture had higher retention values than two bar. Retention loss occurred in both groups after the insertion removal cycles. Release period value was lower in two bar overdenture than three bar overdenture.

scholarly journals Retention of provisional crowns cemented with eight temporary cements: comparative study

2004 ◽  
Vol 12 (3) ◽  
pp. 209-212 ◽  
Author(s):  
Mariana Ribeiro de Moraes Rego ◽  
Luiz Carlos Santiago
Keyword(s):  
Tensile Strength ◽  
Comparative Study ◽  
Testing Machine ◽  
Strength Test ◽  
The Other ◽  
Universal Testing Machine ◽  
Tensile Strength Test ◽  
Universal Testing ◽  
Significant Difference ◽  
Crown Preparation

Many temporary cements are commercially available; therefore, it is necessary to indicate them for each clinical requirement with regard to the tensile strength of prosthetic retainers. Thus, the purpose of this study was to compare the retention of provisional crowns cemented with eight temporary cements, over full crown preparations with standardized mechanical principles as height, taper, and length. For that purpose, eighty human first premolars received full crown preparation with standardized height and taper. Provisional crowns were fabricated and luted with eight brands of temporary cements. Twenty four hours after cementation, the restorations were submitted to tensile strength test in a universal testing machine and the data submitted to ANOVA and Bonferroni tests. Mean tensile strength values ranged from 20.1N for Nogenol cement to 67.5N for Hydro C cement. Statistically significant difference (p<0.05) was found between Hydro C and the other groups, except for Temp Bond and Rely X Temp, which presented statistically significant difference when compared to Freegenol and Nogenol temporary cements. The crowns cemented with Hydro C cement were more retentive that than those cemented with the other cements, except for Rely X Temp and Temp Bond. The less retentive crowns were those cemented with Nogenol and Freegenol temporary cements.

scholarly journals Pengaruh Jenis dan Volumetrik Fiber terhadap Kekuatan Transversal Reparasi Plat Resin Akrilik

2015 ◽  
Vol 1 (1) ◽  
pp. 102
Author(s):  
Pramudya Aditama ◽  
Siti Sunarintyas ◽  
Widjijono Widjijono
Keyword(s):  
Glass Fiber ◽  
Glass Fibers ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Universal Testing Machine ◽  
Transverse Strength ◽  
Universal Testing ◽  
Group I ◽  
Significant Difference ◽  
Post Hoc

Resin akrilik merupakan bahan yang sering digunakan dalam pembuatan basis gigi tiruan. Kelemahan resin akrilik adalah mudah patah. Salah satu cara untuk mengatasi masalah tersebut adalah dengan menambahkan polyethylene (PE) atau glass fiber. Tujuan dari penelitian ini untuk mengetahui pengaruh jenis dan volumetrik fiber terhadap kekuatan transversal reparasi plat resin akrilik. Penelitian ini menggunakan dua puluh lima plat resin akrilik kuring panas berukuran 65 x 10 x 2,5 mm. Subjek dipreparasi untuk membuat jarak 3 mm dan sudut bevel 45o. Subjek dibagi menjadi 5 kelompok, masingmasing kelompok terdiri dari 5 subjek. Kelompok 1 (kontrol) tanpa penambahan fiber, kelompok II dengan penambahan 3,7% v/v PE fiber, kelompok III dengan penambahan 7,4% v/v PE fiber, kelompok IV dengan penambahan 3,7% v/v E-glass fiber, dan kelompok V dengan penambahan 7,4% v/v E-glass fiber. Seluruh plat direndam dalam air destilasi selama satu hari pada suhu 37oC. Pengujian kekuatan transversal plat resin akrilik dengan menggunakan Universal Testing Machine dan data yang didapat dianalisis menggunakan ANAVA dua jalur dengan tingkat kepercayaan 95%. Rerata kekuatan transversal (MPa) reparasi plat resin akrilik yang diperkuat fiber: 3,7% v/v PE fiber (67,77±3,34); 7,4% v/v PE fiber (80,37±8,42); 3,7% v/v E-glass fiber (96,72±5,43); 7,4% v/v E-glass fiber (109,44±4,98); sedangkan reparasi plat resin yang tidak diperkuat fiber menghasilkan kekuatan transversal 56,27±4,7 MPa. Hasil analisis menggunakanANAVA dua jalur menunjukkan variabel jenis dan volumetrik fiber memberikan pengaruh signifikan (p<0,05), sedangkan interaksi antara jenis dan volumetrik fiber tidak berpengaruh signifikan (p>0,05). Uji post hoc Tukey menunjukkan perbedaan signifikan (p<0,05) untuk seluruh kelompok perlakuan. Penambahan E-glass fiber dalam reparasi plat resinakrilik mampu meningkatkan kekuatan transversal lebih tinggi dibandingkan dengan menggunakan PE fiber. Peningkatan volumetrik fiber dapat meningkatkan kekuatan transversal reparasi plat resin akrilik. Effect Of Type And Volumetric Fiber On Transverse Strength Of Acrylic Resin Plate Repair. Acrylic resin is the most common denture base material. A disadvantage of acrylic resin is that it is easily fractured. One way to resolve this problem is by adding polyethylene (PE) or glass fibers. The purpose of this research is to find out about the effect of type and volumetric fiber on transverse strength of acrylic resin plate repaired. The experiment involved twenty five plates of heat cured acrylic with the dimensions of 65 x 10 x 2.5 mm. The speciments were prepared to create a 3 mm gap and 45° bevel. The subjects were divided into 5 groups; each group consisted of 5. Group I (control) was without fiber reinforcement, group II reinforced with 3.7% v/v PE fiber, group III reinforced with 7.4% v/v PE fiber, group IV reinforced with 3.7% v/v E-glass fiber, and group V reinforced with 7.4% v/v E-glass fiber. All plates were soaked in distilled water for one day at 37° C temperature. The plates were tested for transverse strength with Universal Testing Machine and all data obtained were analyzed with two way ANOVA at 95% confidence level. The mean of transverse strength (MPa) of the acrylic resin plate repair reinforced with fiber: 3.7% v/v PE fiber was (67.77±3.34); 7.4% v/v PE fiber (80.37±8.42); 3.7% v/v E-glass fiber (96.72±5.43); 7.4% v/v E-glass fiber (109.44±4.98); while the transverse strength of the acrylic resin plate with no fiber reinforced was 56.27±4.7 MPa. Two way ANOVA analysis shows that type and volumetric fiber had significant effect (p<0.05), while the interaction between type and volumetric fiber had no significant effect (p>0.05). Tukey post hoc test shows significant difference (p<0.05) for all groups. The addition of E-glass fibers in the acrylic resin plate repaired increased the transverse strength higher than that with PE fibers. The increase in volumetric fibers might improve the transverse strength of the acrylic resin plate repaired.

Effect of Adhesive Boosters on Bond Strength of Bleached Teeth in Orthodontic Bonding

2021 ◽  
pp. 030157422110044
Author(s):  
I Ranganayakulu ◽  
D Praveen Kumar Varma ◽  
Padma Priya CV ◽  
RSVM Raghu Ram ◽  
K Anand Viswanadh ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Orthodontic Brackets ◽  
Carbamide Peroxide ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Significant Difference ◽  
Maxillary Premolars ◽  
And Control

Objectives: To evaluate and compare the effect of adhesion boosters on shear bond strength (SBS) of orthodontic brackets on bleached teeth. Materials and Methods: A sample of 90 extracted maxillary premolars was equally divided into 2 groups of bleached and non-bleached teeth. Twenty-two percent carbamide peroxide gel was used as an agent for bleaching. Each group was further divided equally into 3 subgroups depending on the type of adhesive booster used (Enhance LC, All-bond 2, and no adhesive booster [control]) and maxillary premolars brackets were bonded. Debonding was done with a universal testing machine, and the SBS was recorded. Results: The SBS of non-bleached teeth was highest for All-bond 2 (14.78 ± 2.47 MPa) followed by Enhance LC (13.15 ± 3.49 MPa) and control (10.30 ± 1.06 MPa). The SBS of bleached teeth was highest for All bond 2 (12.23 ± 1.41 MPa) followed by Enhance LC (11.76 ± 1.71 MPa) and control (9.63 ± 1.06 MPa). All subgroups showed a significant difference in SBS (P = .000) on bleached and non-bleached teeth. The SBS showed a significant difference between the bleached and non-bleached teeth in All-bond 2 group (P = .019). Conclusion: Adhesive boosters increased the SBS of both bleached and non-bleached teeth significantly. Among the two adhesive boosters used, All-bond 2 showed more SBS values.

scholarly journals The Effect of Mouthwash Containing Alcohol on Flexural Strength of Polymethylmethacrylate and Thermoplastic Nylon

2020 ◽  
Vol 3 (1) ◽  
pp. 17
Author(s):  
Eva Riani ◽  
Octarina Octarina
Keyword(s):  
Flexural Strength ◽  
Testing Machine ◽  
Research Groups ◽  
Anova Test ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Significant Difference ◽  
The Mean ◽  
Materials Used ◽  
Test Result

Introduction: Polymethylmethacrylate (PMMA) and thermoplastic nylon are materials used for making denture bases. Denture users use various methods in order to keep clean their denture. Mouthwash can be an option for cleaning dentures because it is easier to find. Objective: The objective of this research was to investigate the effect of mouthwash containing alcohol as a denture cleanser on flexural strength of polymethylmethacrylate and thermoplastic nylon. Methods: Eighteen samples of polymethylmethacrylate and eighteen samples of thermoplastic nylon with a bar shape (65x10x3 mm) are being used in this research. Each materials are randomly divided into 3 groups (n=6) so there will be six research groups incuded : (A1) PMMA immersed aquades, (A2) PMMA immersed in mouthwash containing alcohol 21.6%, (A3) PMMA immersed in mouthwash containing alcohol 9%, (B1) thermoplastic nylon immersed in aquades, (B2) thermoplastic nylon immersed in mouthwash containing alcohol 21.6%, (B3) thermoplastic nylon immersed in mouthwash containing alcohol 9%. Flexural strength of two materials was tested using universal testing machine (Shimadzu AGS - 5KNX, Japan). All of the data obtained were analyzed using two way Anova test. Result: The mean of flexural strength for group A1 (104.275 ± 15.469 MPa), A2 (103.298 ± 10.387 MPa), A3 (111.626 ± 14.957 MPa), B1 (42.707 ± 4.857 MPa), B2 (38.258 ± 3.246 MPa), and B3 (40.218 ± 1.542 MPa). Result of analysis showed that there was a significant differences between flexural strength of polymethylmethacrylate and thermoplastic nylon (p<0,05), but immersion in mouthwash containing  alcohol showed no significant difference (p>0,05). Conclusion: This research found that flexural strength of polymethylmethacrylate higher than flexural strength of thermoplastic nylon and mouthwash containing alcohol can be an alternative for cleaning a denture because it does not affect the flexural strength of both material significantly.

scholarly journals Pengaruh Etsa Kimia dengan Akua Regia terhadap Kekuatan Tarik Perlekatan Bahan Resin Akrilik pada Gigi Tiruan Kerangka Logam

2012 ◽  
Vol 19 (1) ◽  
pp. 13
Author(s):  
M Th Esti Tjahjanti ◽  
Heriyanti Amalia Kusuma ◽  
Titik Ismiyati ◽  
Erwan Sugiatno
Keyword(s):  
Bond Strength ◽  
Testing Machine ◽  
Metal Plate ◽  
T Test ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
Universal Testing Machine ◽  
Acrylic Resins ◽  
Universal Testing ◽  
Significant Difference

Latar belakang. Bahan yang dipakai untuk pembuatan Gigi Tiruan Sebagian (GTS), antara lain: resin akrilik, kerangka logam, kombinasi kerangka logam dengan resin akrilik. Resin akrilik adalah bahan plat gigi tiruan yang memliki warna dan translusensi baik tetapi sifat mekanismenya tidak ideal, tidak tahan terhadap abrasi, dan dapat terjadi perubahan dimensi. GTS kerangka logam cukup kuat, tetapi estetis kurang memuaskan sehingga perlu kombinasi kerangka logam dan resin akrilik. Peningkatan daya lekat antara kedua bahan tersebut memerlukan retensi, teknik etsa kimia dengan akua regia dapat membuat retensi mikro pada logam. Tujuan penelitian untuk mengetahui etsa kimia dengan akua regia terhadap kekuatan tarik perlekatan bahan resin akrilik pada gigi tiruan kerangka logam. Metode penelitian. Penelitian dilakukan pada 20 subyek penelitian berupa plat kobalt kromium dengan mesh dilekati resin akrilik (10x10x2) mm yeng dilekati mesh ukuran (10x8x1) mm. Subyek penelitian dibagi 2 kelompok: 10 subyek plat kobalt kromium dengan mesh dilekati resin akrilik (20x10x2) mm dan 10 subyek penelitian plat kobalt kromium dengan mesh dietsa dengan akua regia 65% selama 5 menit, kemudian dilekati dengan resin akrilik (20x10x2) mm. dilakukan uji kekuatan tarik menggunakan Torsee’s universal testing Machine dengan ukuran kg/mm2, kemudian hasil analisa dengan t-test. Hasil Penelitian menunjukkan rata-rata kekuatan tarik perlekatan bahan resin akrilik dengan kerangka logam yang tidak dietsa lebih kecil daripada yang dietsa kimia dengan akua regia. Terdapat perbedaan yang bermakna kekuatan tarik perlekatan resin akrilik dengan kerangka logam yang tidak dietsa dengan yang dietsa secara kimia dengan akua regia (p<0,05). Kesimpulan. Etsa kimia dengan akua regia pada kerangka logam, meningkatan perlekatan bahan resin akrilik pada gigi tiruan kerangka logam. Background. Materials used in making removable partial denture (RPD) can be acrylic resins, metal plate, combination between metal plate and acrylic resins. Acrylic resins is plate denture material have good colour and translucent but the mechanical characteristic is not ideal, unstable to the abrasion, and can be occurred change in dimension. The frame removable partial denture is strong enough but estethically unsatisfaying, therefore need the acrylic resins and metal plate combination RPD. The purpose of this study was to know the influence of chemical etching with akua regia towardbond strength of acrylic resins in frame denture. Methods. The study was conducted in 20 subject of chromium cobalt plate (10x10x2) mm that was attached with a mesh measurement (10x8x1) mm. The sample were devided into two groups. The first group consisted of 10 samples of chromium cobalt plate (10x8x2) mm with a mesh was attached with acrylic resins (20x10x2) mm. The second group consisted of 10 samples of chromium cobalt plate (10x10x2) mm with a mesh etched with 65% akua regia for 5 minutes, than attached with acrylic resins (20x10x2) mm. the bond strength test was carried out using Torsee’s Universal Testing Machine in kg/mm2, than was statistically analyzed using t-test. The result of this study demonstrated that mean of bond strength of acrylic resins combined with nonetched metal plate was smaller than that with etched metal plate. There was a significant difference of the bond strength of acrylic resins combined with metal plate etched and that with metal plate non-etched (p<0,05). Conclusion. The chemical with akua regia in the metal frame increases the attachment of the acrylic resin in the frame denture.

scholarly journals Can Fiber Application Affect the Fracture Strength of Endodontically Treated Teeth Restored with a Low Viscosity Bulk-Fill Composite?

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Evrim Eliguzeloglu Dalkılıç ◽  
Magrur Kazak ◽  
Duygu Hisarbeyli ◽  
Mehmet Ali Fildisi ◽  
Nazmiye Donmez ◽  
...  
Keyword(s):  
Fracture Strength ◽  
Fracture Resistance ◽  
Testing Machine ◽  
The Other ◽  
Control Groups ◽  
Endodontically Treated Teeth ◽  
Low Viscosity ◽  
Universal Testing ◽  
Significant Difference ◽  
Insertion Techniques

Objective. The aim of this study is to evaluate the effects of different fiber insertion techniques and thermomechanical aging on the fracture resistance of endodontically treated mandibular premolar teeth restored using bulk-fill composites. Materials and Methods. Eighty human mandibular premolar teeth were randomly divided into eight groups: Group IN, Group BF, Group PRF1, Group PRF2, Group IN-TMA, Group BF-TMA, Group PRF1-TMA ,and Group PRF2-TMA. Group IN (intact) and Group IN-TMA (intact but subjected to thermomechanical aging) served as control groups. In the other six groups, endodontic treatment was performed and standardized mesio-occluso-distal (MOD) cavities were prepared. In BF, PRF1, and PRF2, the cavities were restored with bulk-fill composite only, bulk-fill/Ribbond, and bulk-fill/additional Ribbond, respectively. In BF-TMA, PRF1-TMA, and PRF2-TMA, the teeth were subjected to thermomechanical aging after the restorations. All of the teeth were fractured on the universal testing machine. Fracture surfaces were analyzed with a stereomicroscope. Results. Control groups showed significantly higher fracture strengths than tested groups (P<0.05). No statistically significant difference was observed among the tested groups (P>0.05). Most of the favorable fractures were seen in PRF1, PRF2, and PRF2-TMA. Most of the unfavorable fractures were seen in BF-TMA. Conclusions. Although fiber insertion with different techniques did not increase the fracture strength of teeth restored with bulk-fill composites, it increased the favorable fracture modes. Thermomechanical aging did not change the fracture strength of the groups.

scholarly journals Pengaruh bahan desensitasi pasca bleaching ekstrakoronal terhadap kekuatan geser pelekatan restorasi resin komposit

2017 ◽  
Vol 2 (1) ◽  
pp. 35
Author(s):  
Ema Mulyawati
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Artificial Saliva ◽  
Testing Machine ◽  
Group Iii ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Group I ◽  
Significant Difference

The Effect of desensitizing agent in post-extracoronal bleaching on shear bond strength of composite resin. The dentinal hypersensitivity is a common condition among patients after extracoronal bleaching treatment that usually needs the application of desensitizing agent. The purpose of this study was to evaluate the composite resin restoration shear bond strength with and without desensitizing application after extracoronal bleaching using 40% of H2O2. Twenty one extracted permanent human incisor teeth were randomly divided into 3 groups of 7 each. Group I was with the application of 40% H2O2 without any desensitizing agent. Group II was with the application of 40% of H2O2 with desensitizing agent and group III served as the control. The teeth were immersed in artificial saliva and stored in 37 °C incubator for 7 days. The teeth were restored using composite resin. After restoring the shear bond strength of composite resin was tested using a universal testing machine. Result and conclusion. there is no significant difference between bleaching group with and without desensitizing agent. The application of desensitizing agent after extracoronal bleaching did not impact the composite resin shear bond strength.ABSTRAKDentin hipersensitif merupakan kondisi yang biasa dialami pasien setelah perawatan bleaching ekstrakoronal yang biasanya memerlukan aplikasi bahan desensitasi. Penelitian ini bertujuan untuk mengetahui pengaruh bahan desensitasi pasca bleaching ekstrakoronal menggunakan H2O2 40% terhadap kekutan geser pelekatan restorasi resin komposit. Dua puluh satu gigi permanen insisivus yang telah dicabut dibagi dalam tiga kelompok masing-masing 7 gigi. Kelompok I dilakukan bleaching ekstrakoronal dengan H2O2 tanpa bahan desensitasi. Kelompok II dilakukan bleaching setelah itu diaplikasikan bahan desensitasi dan kelompok III sebagai kelompok kontrol. Semua gigi-gigi tersebut di rendam dalam saliva buatan dan dimasukkan inkubator selama 7 hari pada suhu 37 °C. Selanjutnya seluruh gigi dilakukan restorasi resin komposit menggunakan light cure halogen. Setelah itu dilakukan pengujian kekuatan geser pelekatan menggunakan universal testing machine. Data dianalisis menggunakan uji Kruskal - Wallis. Hasil penelitian menunjukkan bahwa tidak ada perbedaan kekuatan geser pelekatan pada semua kelompok perlakuan (p > 0,05). Dari penelitian ini disimpulkan bahwa tidak terdapat pengaruh aplikasi bahan desensitasi pasca bleaching ekstrakoronal terhadap kekuatan geser pelekatan restorasi resin komposit.

scholarly journals Retention of Cast Posts Cemented with Two Commonly Used Conventional and Two Resin Cements and the Mode of Root Fracture Following Their Removal

2021 ◽  
Author(s):  
Azadeh Hesarkhani ◽  
Farnoush Fotovat ◽  
Fatemeh Saneian ◽  
Hosein Akbari ◽  
Hanif Allahbakhshi
Keyword(s):  
Zinc Phosphate ◽  
Testing Machine ◽  
Resin Cement ◽  
Endodontically Treated Teeth ◽  
Root Fracture ◽  
Universal Testing Machine ◽  
Pull Out ◽  
Universal Testing ◽  
Significant Difference

Objectives: This study aimed to compare the retention of cast posts cemented with four types of cements and assess the mode of root fracture following their removal. Materials and Methods: In this in vitro, experimental study, 48 upper central incisors were randomly divided into 4 groups of 12, and were endodontically treated. The fabricated cast posts in each group were cemented with zinc phosphate (Masterdent), glass ionomer (GI; Meron), Meta resin cement, and Panavia SA resin cement. A device was customized for post removal by a universal testing machine similar to WAM X pliers. The retention of cemented posts was measured by the pull-out test in a universal testing machine. Next, the teeth were macroscopically and microscopically inspected regarding the occurrence and sites of catastrophic fracture, cracks, or craze lines. Quantitative and qualitative data were analyzed by ANOVA, and Chi-square test, respectively (P<0.05). Results: ANOVA showed a significant difference in the mean retention of cements (P<0.001). Panavia provided the highest retention (278.6±34.9 N) followed by zinc phosphate (221.9±28.88 N), GI (161.3±60.7 N), and Meta (140.4±66.54 N). There was no significant difference between the groups regarding the pattern of root fracture (P=0.39). However, site and extent of fractures were significantly different among the groups (P<0.05). Conclusion: The conventional cements provided optimal retention and caused less root damage after post removal. Thus, cements providing adequate retention and allowing easier post removal are recommended for use in endodontically treated teeth with a possibility of requiring retreatment.

scholarly journals Fracture strength of teeth restored with milled ultrathin occlusal veneers made of polymer-infiltrated ceramic

2021 ◽  
Vol 32 (5) ◽  
pp. 105-113
Author(s):  
Laerte Ohse ◽  
Deborah Stona ◽  
Marília M. Sly ◽  
Luiz Henrique Burnett Júnior ◽  
Ana Maria Spohr
Keyword(s):  
Fracture Strength ◽  
Testing Machine ◽  
Strength Test ◽  
The Other ◽  
Single Bond ◽  
Third Molars ◽  
Universal Testing Machine ◽  
Universal Testing

Abstract The purpose was to evaluate, in vitro, the fracture strength of teeth restored with 0.3- or 0.6-mm-thick occlusal veneers made of Vita Enamic® bonded to enamel or dentin. Fifty third molars were allocated into five groups (n=10): Group C - control (sound teeth); Group 0.3E - 0.3-mm-thick occlusal veneers bonded to enamel; Group 0.6E - 0.6-mm-thick occlusal veneers bonded to enamel; Group 0.3D - 0.3-mm-thick occlusal veneers bonded to dentin; Group 0.6D - 0.6-mm-thick occlusal veneers bonded to dentin. After luting with Single Bond Universal and Filtek Z-100, the samples were subjected to fracture strength test in a universal testing machine. The fractures were classified as irreparable and reparable. Data were analyzed with 2-way and 1-way ANOVA (α=.05) followed by Tukey’s test. The teeth restored with 0.3-mm-thick occlusal veneers (2658 N) achieved significantly higher fracture strength compared to the teeth restored with 0.6-mm-thick occlusal veneers (2070 N) (p=0.017). The teeth restored with occlusal veneers bonded to enamel (2648 N) had significantly higher fracture strength compared to the teeth restored with occlusal veneers bonded to dentin (2049 N) (p=0.015). Group C (3355 N) and Group 0.3E (2965 N) did not differ significantly from each other, being the fracture strength significantly higher than the other groups (p<0.05). The fractures were predominantly reparable. The teeth restored with 0.3-mm-thick occlusal veneers achieved higher fracture strength compared to the teeth restored with 0.6-mm-thick occlusal veneers. The supporting substrate influenced the fracture strength, which was higher for the teeth restored with occlusal veneers bonded to enamel.

scholarly journals Stress analysis of over-denture abutments treated with two obturation techniques

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Ahmed N. Elsherbini ◽  
Mohamed M Nagy ◽  
Nancy N Elsherbini
Keyword(s):  
Stress Analysis ◽  
Testing Machine ◽  
The Other ◽  
Strain Gauges ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Supporting Structures

Aim: Evaluation of stresses induced on over-denture abutments endodonticaly treated with two different obturation techniques.Materials and methods: eight mandibular permanent canines were inserted in four pesudo-realistic models.  In each model two canines were placed in it. One canine was treated with lateral obturation technique and the other canine with vertical obturation technique. Four over-denture prostheses were fabricated on the four models. Then strain gauges were attached on the coronal one third of the root buccally and lingually for all eight canines. A metal rod was placed occlusally on the premolar –molar area, and a 50 N load was applied on the middle of the rod using the universal testing machine. Readings were collected. Results: from the collected data the lateral obturation showed 85.25±104.901 µε and the vertical obturation showed 4.875±3.555 µε with significance difference of P<0.05 between the groups.Conclusion: it can be concluded that the abutments treated with vertical obturation techniques reduced the stresses induced to the supporting structures when compared with the lateral condensation technique.

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