Influence of Bulk-fill Restoration on Polymerization Shrinkage Stress and Marginal Gap Formation in Class V Restorations

2020 ◽  
Vol 45 (4) ◽  
pp. E207-E216 ◽  
Author(s):  
AMO Correia ◽  
MR Andrade ◽  
JPM Tribst ◽  
ALS Borges ◽  
TMF Caneppele
Keyword(s):  
Stress Distribution ◽  
Repeated Measures ◽  
Shrinkage Stress ◽  
Restorative Material ◽  
Gap Formation ◽  
Marginal Gap ◽  
Class V ◽  
Polymerization Shrinkage ◽  
Before And After ◽  
Filled Composite

Clinical Relevance Restoring Class V cavities with a regular bulk-fill composite presents a more favorable biomechanical behavior than restoring with a regular nano-filled composite. SUMMARY Purpose: This study evaluated the influence of Class V cavity extension and restorative material on the marginal gap formation, before and after aging, and the theoretical polymerization shrinkage stress distribution in a tooth restoration. Methods and Materials: Class V cavities with the depth of 2 mm, cervical/incisal distance of 4 mm, and margins located in the enamel 1 mm above the cementoenamel junction were prepared in 60 bovine incisors in two mesiodistal dimensions (n=30): 2.9-mm large extension cavities (LE) or 1.4-mm small extension cavities (SE). The cavities' depths were validated using a periodontal probe, while the mesiodistal and cervical/incisal distances were measured using a stereomicroscope. After adhesive application (Clearfil SE Bond), each group was randomly divided into two groups (n=15) according to the restorative material: Filtek Z350 XT (N) or Filtek Bulk Fill Posterior (BF). The marginal gap formation between the tooth structure and the restorative material was evaluated using a stereomicroscope before and after thermocycling for 15,000 cycles (5°C and 55°C). Data were analyzed using repeated-measures analysis of variance (ANOVA) and Tukey test for multiple comparisons (α=0.05). A three-dimensional geometric model with the same dimensions as the experimental test was created for each cavity, and the restorations were modeled for each restorative material. In the analysis software, the finite element mesh was created with tetrahedral quadratic elements, and the polymerization shrinkage was simulated by thermal analogy. The maximum principal stress was used to express the tensile stress in the adhesive interface through colorimetric graphs. Results: For the marginal gap, the repeated-measures ANOVA revealed a significant effect only for the factors composite resin (df=1, F=4.09, p=0.04) and thermal aging (df=1, F=44.35, p<0.001). For all numerical simulations, higher stress concentration occurred at the enamel margin, and the stress peak decreased in the following sequence: LE-N (17.0 MPa) > SE-N (15.0 MPa) > LE-BF (9.1 MPa) > SE-BF (8.2 MPa). Conclusion: Marginal gaps in the specimens fell between approximately 12 and 17 μm; however, the regular bulk-fill composite showed less gap formation and better stress distribution around the cavity margin than the regular nano-filled composite, regardless of the cavity extension.

scholarly journals THE COMPARISON OF RESIN-BASED COMPOSITES PHYSICAL PROPERTIES BETWEEN BULK-FILL TECHNIQUE AND INCREMENTAL TECHNIQUE

2021 ◽  
Vol 6 (1) ◽  
pp. 85
Author(s):  
Rahmi Khairani Aulia
Keyword(s):  
Physical Properties ◽  
Composite Resin ◽  
Color Stability ◽  
Composite Resins ◽  
Shrinkage Stress ◽  
Restorative Material ◽  
Polymerization Shrinkage ◽  
Advantages And Disadvantages ◽  
Restoration Technique ◽  
Restoration Failure

ABSTRACT:Composite resins are currently the most popular restorative material in dentistry. This is due to good aesthetics and maximum conservation ability. Behind these advantages, there are disbenefits of composite resin materials, such as polymerization shrinkage, which can lead to restoration failure. Various attempts have been investigated to reduce the shrinkage incidence of composite resins, one of which is the technique of placing the restorative material into the cavity. The restoration filling technique is recognized as a significant factor in shrinkage stress. By using a special filling technique, the polymerization shrinkage damage stress can be reduced. There are several techniques in performing composite resin fillings, including bulk and incremental techniques. These techniques have their respective advantages and disadvantages. The aim of this literature review was to compare the physical properties of composite resin restorations with bulk filling and incremental techniques. Physical properties that being studied include polymerization shrinkage, stress shrinkage, degree of conversion, bonding strength, water resorption, color stability, and temperature increase. Comparing the two techniques, composite resin with incremental filling technique has superior physical properties compared to bulk technique. From the comparison of the two techniques, the composite resin with incremental filling technique has superior physical properties compared to the bulk technique, especially in higher conversion which causes lower shrinkage stress. This situation makes the incremental technique provide better bond strength, water resorption, color stability, and lower temperature rise.Keywords: Bulk, Composite Resin, Incremental,  Physical Properties, Restoration, Restoration Technique

scholarly journals The Effect of Thermocycling on Interfacial Bonding Stability of Self-Etch Adhesives: OCT Study

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
T. A. Bakhsh ◽  
A. Turkistani
Keyword(s):  
Laser Scanning ◽  
Adhesive System ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Gap Formation ◽  
Swept Source ◽  
Before And After ◽  
One Step ◽  
Self Etch ◽  
Filled Composite

Objective. The aim of this study was to monitor the behavior of interfacial gaps formed under different bonded polymeric restorations before and after thermocycling (TC), using swept-source optical coherence tomography (SS-OCT) and confirming the obtained findings with confocal laser scanning microscopy (CLSM). Materials and Methods. Cylindrical class I cavities were prepared in twenty noncarious human premolar teeth ( 1.5   mm   depth × 3.5   mm   diameter ) and divided randomly into two groups: TS and SN, according to the adhesive system ( n = 10 ). In the TS group, one-step self-etch adhesive Clearfil Tri-S Bond Plus (Kuraray Noritake Dental, Japan) was used, followed by composite restoration using Estelite Sigma Quick (Tokuyama Dental, Japan). In the SN group, the cavities were restored with the two-step self-etch/composite silorane-based resin restoration system (3M ESPE, USA). All specimens were restored in bulk filling technique and cured in accordance with the manufacturers’ instructions. Both groups were imaged under SS-OCT after 24 h and recorded as controls. Then, each group was subjected to thermal challenge using the TC machine (5–55°C) and B-scans were recorded at different TC intervals (2600, 5200, and 10000). In order to confirm the SS-OCT findings, additional specimens were prepared, scanned, and sectioned for CLSM observation. Results. B-scans demonstrated white clusters at the tooth-resin interface that corresponded to the gap location on CLSM images. The TS group showed significantly less gap formation than the SN group before and after TC ( p < 0.001 ). Conclusions. An optimal composite adaptation can be achieved when the bonded restoration comprises a combination of an adhesive containing 10-MDP monomer and a considerable highly filled composite.

scholarly journals Evaluation of Newly Introduced Bioactive Materials in Terms of Cavity Floor Adaptation: OCT Study

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7668
Author(s):  
Heba B. Abdel-Maksoud ◽  
Aziza W. Bahanan ◽  
Lujain J. Alkattabi ◽  
Turki A. Bakhsh
Keyword(s):  
Restorative Material ◽  
Gap Formation ◽  
Class V ◽  
Bioactive Materials ◽  
Imaging Tool ◽  
Anterior Teeth ◽  
Significant Difference ◽  
Bioactive Composites ◽  
Vertise Flow ◽  
Cavity Floor

Objective. The aim of the present study was to evaluate the adaptation of newly introduced bioactive restorative materials to the cavity floor using cross-polarization optical coherence tomography (CP-OCT). Materials and Methods. Round class V cavities were prepared on the proximal surfaces of sixty non-carious human anterior teeth (0.5 mm depth × 4 mm diameter), which were divided into groups according to the restorative material (n = 15). In the VF group, Vertise flow composite (Kerr, Orange, CA, USA) was used, in the BF group, Beautifil II composite (Shofu, Koyoto, Japan) was used, and in the AB group, ACTIVA BioACTIVE composite (Pulpdent, Watertown, NY, USA) was used. Cavities were restored using the bulk filling technique and cured according to the manufacturers’ instructions. Then, the specimens were immersed in a contrasting agent, and image acquisitions were taken by CP-OCT to calculate the adaptation percentage by using an image analysis software. Results. B-scans showed a diffuse bright band of white pixels at the tooth-resin interface that was interpreted as a micro-gap present between the cavity floor and restorative material. The Kruskal-Wallis test showed a statistically significant difference between all tested groups with the AB group representing the least gap formation, followed by the BF group, and then the VF group, which demonstrated the highest gap formation. Conclusions. In class V cavities, better adaptation to the cavity floor can be obtained when using ACTIVA BioACTIVE more than Vertise flow and Beautifil II composites. In addition, CP-OCT is considered a non-destructive imaging tool that helps in evaluating the quality of the tooth-restoration interface when bioactive composites are used.

scholarly journals Implant Volume Loss, Misfit, Screw Loosening, and Stress In Custom Titanium and Zirconia Abutments

2020 ◽  
Vol 31 (4) ◽  
pp. 374-379
Author(s):  
Sales Antônio Barbosa Jr ◽  
Ataís Bacchi ◽  
Valentim Adelino Ricardo Barão ◽  
Yara Teresinha Corrêa Silva-Sousa ◽  
João Felipe Bruniera ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Repeated Measures ◽  
Titanium Implants ◽  
Volume Loss ◽  
Screw Loosening ◽  
Mechanical Cycling ◽  
Torque Wrench ◽  
Significant Difference ◽  
Before And After ◽  
Cad Cam

Abstract The aim of this study was to verify the effect of the implant volume loss, vertical misfit between abutment and prosthetic platform, prosthetic screw loosening torque, and screw stress distribution in titanium and zirconia abutments. Ten CAD/CAM system custom abutments of each material were milled and attached to the titanium implants. The implant volume loss was evaluated by microtomography, the vertical misfit with optical microscopy, and digital torque wrench measured the prosthetic screw loosening. All experimental analyses were performed before and after mechanical cycle (1,000,000 cycles, 100 N/2 Hz). Virtual models of the structures were created for finite element analysis, and the stress on the screw obtained with von Mises procedure. Data were analyzed using an independent t-test, two-way ANOVA for repeated measures, and Tukey’s HSD test (a=0.05). There was no significant difference in the implant volume loss for the two abutment materials (p=0.662). Titanium abutments provided higher loosening torque values after mechanical cycling (p<0.001). Lesser marginal misfit was obtained with titanium abutments before and after mechanical cycling (p<0.001). The stress distribution on the screw was similar between abutment materials. In conclusion, CAD/CAM custom titanium abutment reduced the marginal misfit and increased the torque maintenance of prosthetic screws when compared to CAD/CAM custom zirconia abutment.

Does overlay preparation design affect polymerization shrinkage stress distribution? A 3D FEA study

2021 ◽  
pp. 1-10
Author(s):  
Guilherme Schmitt de Andrade ◽  
Alana Barbosa Alves Pinto ◽  
João Paulo Mendes Tribst ◽  
Eliseo Pablo Chun ◽  
Alexandre Luiz Souto Borges ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Shrinkage Stress ◽  
Polymerization Shrinkage ◽  
3D Fea ◽  
Preparation Design

Marginal gap formation in the composite resin/glass ionomer cement Class V restoration

1988 ◽  
Vol 4 (3) ◽  
pp. 134-138 ◽  
Author(s):  
C.B. Phair ◽  
O. Zidan ◽  
O. Gomez-Marin ◽  
S. Han
Keyword(s):  
Composite Resin ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Gap Formation ◽  
Marginal Gap ◽  
Class V ◽  
Ionomer Cement

scholarly journals The Effect of Ultrasonic Scaling and Air-Powder Polishing on the Roughness of the Enamel, Three Different Nanocomposites, and Composite/Enamel and Composite/Cementum Interfaces

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3072
Author(s):  
Ksenia Babina ◽  
Maria Polyakova ◽  
Inna Sokhova ◽  
Vladlena Doroshina ◽  
Marianna Arakelyan ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Repeated Measures ◽  
Composite Resin ◽  
Surface Damage ◽  
Third Molars ◽  
Class V ◽  
Composite Surface ◽  
Repeated Measures Anova ◽  
Before And After ◽  
The Mean

We aimed to assess the effects of ultrasonic scaling and air-powder polishing on the roughness of enamel, three nanocomposites (Premise, Herculite Ultra, Harmonize), and composite/enamel and composite/cementum interfaces. Class V cavities were restored in 99 extracted third molars with one of the three nanocomposites and treated with ultrasonic scaler or air-powder polishing device (calcium carbonate or sodium bicarbonate powders). The roughness (Ra) of the investigated surfaces was measured with contact profilometer before and after treatment. The data were analyzed using repeated measures ANOVA. Specimens’ Ra values before instrumentation were near the clinically acceptable 0.2 μm threshold. All techniques increased the roughness of the tested surfaces; however, the enamel was slightly affected. The mean Ra values after prophylaxis for composite, composite/cementum and composite/enamel surfaces were 0.32–0.55, 1.33–1.73, and 1.25–1.36, respectively. The extent of composite surface damage was material dependent. Premise surface was not altered by ultrasonic scaling significantly. Air-powder polishing with both powders produced a greater increase in surface roughness of composite resin and restorations margins than ultrasonic scaling. The Ra values after both types of air polishing for Herculite Ultra and Harmonize were approximately 1.5 and 2 times higher, respectively, than those after ultrasonic scaling (p < 0.05).

Measurement of the Internal Adaptation of Resin Composites Using Micro-CT and Its Correlation With Polymerization Shrinkage

2014 ◽  
Vol 39 (2) ◽  
pp. e57-e70 ◽  
Author(s):  
HJ Kim ◽  
SH Park
Keyword(s):  
Silver Nitrate ◽  
Resin Composite ◽  
Shrinkage Strain ◽  
Shrinkage Stress ◽  
Micro Ct ◽  
Thermomechanical Loading ◽  
Polymerization Shrinkage ◽  
Before And After ◽  
Strain Stress ◽  
Internal Adaptation

SUMMARY In the present study, the internal adaptation of dentin-composite interfaces with various resin composite materials under conditions of thermomechanical loading was analyzed nondestructively using micro–computed tomography (micro-CT), and these results were compared with analyses of microgaps after sectioning. Additionally, the correlation of internal adaptation with polymerization shrinkage strain and stress was evaluated. Four nonflowable resins, Gradia Direct (GD), Filtek P90 (P9), Filtek Z350 (Z3), and Charisma (CH), and two flowable resins, SDR (SD) and Tetric N-Flow (TF) were used. First, the polymerization shrinkage strain and stress were measured. Then, Class I cavities were prepared in 48 premolars. They were divided randomly into six groups, and the cavities were filled with composites using XP bond. To evaluate the internal adaptation, tooth specimens were immersed in a 25% silver nitrate solution, and micro-CT analysis was performed before and after thermomechanical loading. The silver nitrate penetration (%SP) was measured. After buccolingual sectioning and rhodamine penetration of the specimen, the rhodamine penetration (%RP) was measured using a stereo-microscope. One-way analysis of variance was then used to compare the polymerization shrinkage strain, stress, %SP, and %RP among the groups at a 95% confidence level. A paired t-test was used to compare the %SP before and after thermomechanical loading. Pearson correlation analysis was used to compare the correlation between polymerization shrinkage strain/stress and %SP or %RP to a 95% confidence level. Evaluation of the polymerization shrinkage strain demonstrated that P9 &lt; Z3 ≤ GD &lt; CH ≤ SD &lt; TF (p&lt;0.05); similarly, evaluation of the polymerization shrinkage stress showed that P9 ≤ GD ≤ Z3 ≤ CH ≤ SD &lt; TF (p&lt;0.05). The %SP showed that P9 ≤ GD ≤ Z3 &lt; CH ≤ SD &lt; TF (p&lt;0.05) before loading and that P9 ≤ GD ≤ Z3 ≤ CH ≤ SD &lt; TF (p&lt;0.05) after loading. There was a significant difference between the before-loading and after-loading measurements in all groups (p&lt;0.05). Additionally, there was a positive correlation between the %SP and the %RP (r=0.810, p&lt;0.001). Conclusively, the polymerization shrinkage stress and strain were found to be closely related to the internal adaptation of the resin composite restorations. The newly proposed model for the evaluation of internal adaptation using micro-CT and silver nitrate may provide a new measurement for evaluating the internal adaptation of restorations in a nondestructive way.

PENINGKATAN PEMAHAMAN KONSEP PEMBAGIAN PECAHAN DENGAN PENDEKATAN REALISTIC MATHEMATIC EDUCATION DI KELAS V SDN 003 PULAU KOPUNG SINTAJO KECAMTAN SINTAJO RAYA KABUPATEN KUANTAN SINGINGI

2019 ◽  
Vol 3 (2) ◽  
Author(s):  
Sri Apnita Indra
Keyword(s):  
Primary School ◽  
Learning Outcomes ◽  
Mathematics Learning ◽  
Student Learning Outcomes ◽  
Fifth Grade ◽  
Class V ◽  
Fifth Grade Students ◽  
Before And After ◽  
Mathematic Education ◽  
Realistic Mathematic

This research is motivated by the low mathematical understanding ability of students who are still low. This research was conducted on fifth grade students of State Primary School 003 Pulau Kopung, Sintajo District, Kuantan Singingi Regency. This study aims to improve the results of understanding of students' mathematics learning outcomes through the Realistic Mathematic Education (RME) approach. From the data analysis of student learning outcomes before and after the Realistic Mathematic Education approach was applied, students who completed only 10 people or 43.47% with incomplete categories. After the first cycle, students who completed increased to 16 or 69.56% with incomplete categories. For the second cycle, the number of students who completed as many as 20 people or equal to 89.95% with complete categories. From the results of this study it can be concluded that the application of the Realistic Mathematic Education approach can improve the understanding of the concept of dividing students into mathematics subjects in class V of Public Primary School 003 Pulau Kopung, Sintajo Raya District, Kuantan Singingi Regency.

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