The Influence of Different Base Materials on Marginal Adaptation of Direct Class II Composite Resin Restorations

2005 ◽  
Vol 288-289 ◽  
pp. 481-484
Author(s):  
Sung Ho Park ◽  
Yon Sang Cho ◽  
I.Y. Jung ◽  
Kwon Yong Lee ◽  
S.B. Jeon
Keyword(s):  
Mechanical Stress ◽  
Composite Resin ◽  
Base Material ◽  
Control Group ◽  
Marginal Adaptation ◽  
Base Materials ◽  
Before And After ◽  
Composite Resin Restorations ◽  
Entire Margin ◽  
Resin Restorations

The purpose of present study was to evaluate the influence of different base materials on the marginal integrity of posterior direct composite resin restorations. Conventional mesio-occluso-distal(MOD) cavity preparations, with margins in enamel and dentin, were prepared in 24 extracted human mandibular molars and randomly divided into four equal groups. One of three base materials (RMGI, compomer, flowable resin) was placed on the pulpal floors of the teeth of the groups. One group of teeth, which served as the control group, was not given any base material. Then, all teeth were restored with composite resin. The micromorphology of the tooth/restoration interfaces along the entire surfaces of the restorations was quantitatively analyzed using microscope at 150 magnifications immediately after finishing and after completion of thermo-mechanical stress. Marginal adaptation was assessed along the entire margin and % perfect margin (%PM) was calculated. The %PMs before and after thermo-mechanical stress in the groups were compared with Two- way ANOVA with Tukey test at the 95% confidence level. Before thermo-mechanical stress, there was no difference in marginal adaptation between groups. After the thermo-mechanical stress, the RMGI group showed the highest marginal adaptation rate among the tested groups. In compomer and flowable resin groups, the marginal adaptation was lower after thermomechanical stresses than before the stress (p<0.05).

scholarly journals BULKFILL TECHNIQUES WITH INTERMEDIATE LAYER TO MARGINAL ADAPTATION RESTORATION OF CLASS II COMPOSITE RESIN

2021 ◽  
Vol 11 (1) ◽  
pp. 32
Author(s):  
Mochammad Raidjffan Zulkarnaen Tabona ◽  
Adioro Soetojo ◽  
Ira Widjiastuti
Keyword(s):  
Dental Caries ◽  
Intermediate Layer ◽  
Composite Resin ◽  
Class Ii ◽  
Base Layer ◽  
Marginal Adaptation ◽  
Layer Technique ◽  
Natural Teeth ◽  
Composite Resin Restorations ◽  
Resin Restorations

Background: Dental caries is a hard tissue disease caused by bacterial metabolic activity that causes demineralization, teeth that have caries should be filled in order to function again. One of the restorative materials closer to natural teeth is composite resin because it is the same colour as natural teeth and is easy to shape. As for the placement technique, bulkfill is also used because it is more time-efficient, and irradiation is accompanied by applying the restoration material in one batch. However, the bulkfill technique often causes micro-leakage of dental caries deposition. The intermediate layer is an intermediate layer used to prevent micro-leakage at the edges of the restoration as a base layer for restoration to create a good adaptation before applying packable composite resin. Therefore, bulkfill coating technique with the intermediate layer can reduce the risk of microleakage. Purpose: To describe the bulkfill technique with an intermediate layer against marginal adaptation with class II composite resin restorations. Review: The literature sources used in the preparation of the articles through several databases with descriptions. More journals say that micro-leakage in class II cavity deposition with the intermediate layer technique is better than the bulkfill technique because the intermediate layer technique has better bond strength than the bulkfill technique. If the Bulkfill technique is modified with the Intermediate layer technique, it can show good correlation and internal adaptation. Conclusion: Bulkfill technique with an intermediate layer against marginal adaptation with class II composite resin restorations can reduce the microleakage rate by reducing the polymerization's shrinkage strain.

scholarly journals Step-by-step teaching method: improving learning outcomes of undergraduate dental students in layering techniques for direct composite resin restorations

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Jia-xue Yuan ◽  
Ke-yu Yang ◽  
Jing Ma ◽  
Zhen-zhen Wang ◽  
Qing-yu Guo ◽  
...  
Keyword(s):  
Composite Resin ◽  
Teaching Method ◽  
Dental Students ◽  
Control Group ◽  
Final Score ◽  
Composite Resin Restorations ◽  
Group Control Group ◽  
Experimental Group ◽  
Resin Restorations

Abstract Background Layering techniques for direct composite resin restorations might be complicated for inexperienced learners, as a number of materials and instruments are required at each step. The present study aimed to compare and assess the teaching effect of step-by-step and all-in-one teaching methods in layering techniques for direct composite resin restorations among undergraduate dental students. Methods A total of 68 junior dental students participated in this study, which was a prospective and single-blind trial. The students were randomly divided into a step-by-step group (experimental group, n = 34) and all-in-one group (control group, n = 34). The same teacher taught the two groups, ensuring a comparable teaching effect. The final score of each student was an average of scores by two experts who were blinded to the grouping. The scoring system was consisted by five parts. Each part was assigned scores of 3.0, 1.5, or 0. The total maximum score was 15 and minimum was 0. The total time taken by each group was also calculated. Results The values of the quality of tooth restorations evaluated by experts for step-by-step and all-in-one groups were 11.29 ± 2.13 from 15 and 9.00 ± 2.71 from 15 (t = 3.88, P < 0.001), respectively. In addition, the time spent by the experimental group was significantly lesser than that spent by the control group, which was 122.47 ± 2.82 and 137.18 ± 6.75 min, respectively (t = 11.72, p < 0.001). Conclusion With regard to the layering techniques for direct composite resin restorations, the outcomes were better in the step-by-step group than in the all-in-one group.

scholarly journals Comparison of shear bond strength of orthodontics brackets on composite resin restorations with different surface treatments

2013 ◽  
Vol 18 (4) ◽  
pp. 98-103 ◽  
Author(s):  
Alexandre Antonio Ribeiro ◽  
Ariane Vicente de Morais ◽  
Daniel Paludo Brunetto ◽  
Antonio Carlos de Oliveira Ruellas ◽  
Monica Tirre Souza de Araujo
Keyword(s):  
Bond Strength ◽  
Composite Resin ◽  
Testing Machine ◽  
Dental Enamel ◽  
Acrylic Resin ◽  
Orthodontic Brackets ◽  
Control Group ◽  
Post Test ◽  
Composite Resin Restorations ◽  
Resin Restorations

INTRODUCTION: Orthodontic patients frequently present composite resin restorations, however there are few studies that evaluate the best way for orthodontic bonding in this situation. OBJECTIVE: The objective of this work was to evaluate the bond strength of orthodontic brackets in resin restorations with surface treatment. METHODS: Fifty one bovine lower incisors were randomly divided into three groups. On the control group (CG) the brackets were bonded to dental enamel; on experimental groups, brackets were bonded to resin restoration with diamond drill treatment (EGT) and with no treatment (EGN). The teeth were placed in PVC tubes with autopolymerized acrylic resin. The shear test was performed in EMIC universal testing machine. The groups were submitted to ANOVA analysis of variance with Tukey post test to verify the statistical difference between groups (α = 0.05). RESULTS: CG (6.62 MPa) and EGT (6.82 MPa) groups presented similar results, while EGN (5.07 MPa) obtained statistically lower results (p < 0.05). CONCLUSION: Therefore, it is concluded that the best technique for bonding of orthodontic brackets on composite resin restorations is the performance of surface detritions.

Effect of Polishing Direction on the Marginal Adaptation of Composite Resin Restorations

2013 ◽  
Vol 25 (2) ◽  
pp. 125-138 ◽  
Author(s):  
Laurie St-Pierre ◽  
Cathia Bergeron ◽  
Fang Qian ◽  
Maria Marcela Hernández ◽  
Justine L. Kolker ◽  
...  
Keyword(s):  
Composite Resin ◽  
Marginal Adaptation ◽  
Composite Resin Restorations ◽  
Resin Restorations

The Use of Bur and Laser for Root Caries Treatment: A Comparative Study

2013 ◽  
Vol 38 (3) ◽  
pp. 290-298 ◽  
Author(s):  
V Geraldo-Martins ◽  
T Thome ◽  
M Mayer ◽  
M Marques
Keyword(s):  
Composite Resin ◽  
Significant Loss ◽  
Control Group ◽  
Strong Positive Correlation ◽  
Root Caries ◽  
Residual Caries ◽  
Caries Removal ◽  
Composite Resin Restorations ◽  
Resin Restorations

Summary This research analyzed the influence of bur and erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser caries removal on cavity characteristics and marginal seal of composite resin restorations. One hundred and forty human dental root samples were used. After in vitro root caries induction using Streptococcus mutans, the carious lesions were removed either by a conventional technique using burs (G1=control) or by using an Er,Cr:YSGG laser (λ=2.78 μm, 20 Hz, pulse duration≅140 μs, noncontact mode using a 600-μm tip) with the following power outputs: G2: 1.0 W; G3: 1.25 W; G4: 1.5 W; G5: 1.75 W; G6: 2.0 W; G7: 2.25 W; G8: 2.5 W; G9: 2.75 W; G10: 3.0 W; G11: 3.25 W; G12: 3.5 W; G13: 3.75 W; and G14: 4.0 W. Samples in the 14 groups (n=10) were conditioned with Clearfil SE Bond and restored with a flowable composite. They were then thermocycled (1000 cycles) and immersed into a 2% methylene blue solution for microleakage analysis. The data were statistically compared (analysis of variance or Spearman correlation tests; p≤0.05). The lased groups showed significantly greater microleakage indexes, cavity depths, and presence of residual caries than did those of the control group. There was a strong positive correlation between residual caries and microleakage. The results indicate that Er,Cr:YSGG laser irradiation is not a good alternative to the use of burs for root caries removal since it may cause a significant loss of marginal sealing in composite resin restorations.

scholarly journals Clinical evaluation of bulk-fill composite resin and layered composite resin restoration in class I cavity of permanent molar teeth

2018 ◽  
Vol 11 (1) ◽  
pp. 29
Author(s):  
Mohammad Fida Hasan Talukder ◽  
Mozammal Hossain ◽  
Mohammad Ali Asgor Moral
Keyword(s):  
Composite Resin ◽  
United States Public Health ◽  
Layered Composite ◽  
Class I ◽  
Marginal Adaptation ◽  
Color Match ◽  
Permanent Molar ◽  
Molar Teeth ◽  
Composite Resin Restorations ◽  
Resin Restorations

<p class="Abstract">The purpose of the present study was to compare the clinical performance of bulk-fill composite resin with that of layered composite resin restorations in occlusal class I cavity of permanent molar teeth. This study includes a total of 104 teeth having class I cavity of 3-4 mm depth in the occlusal surface. They were restored either with layered composite resin or bulk-fill composite resin of 52 teeth in each group. To observe the retention, marginal adaptation and color match, all restorations were assessed by using modified United States Public Health Services (USPHS) or Ryge’s criteria at baseline, 3, 6 and 12 months. The results of 12 months observation showed that retention of 38 layered composite and 48 bulk-fill composite resin restorations revealed alpha rating, which was statistically significant. The marginal adaptation of 37 layered composite resin and 47 bulk-fill composite resin restorations also demonstrated alpha rating and the differences between two groups were statistically significant. However, there were no significant differences between the layered composite resin and bulk-fill composite resin restorations in respect to color match. It can be concluded that bulk-fill composite resin showed better clinical outcome than that of layered composite resin in the restorations of occlusal class I cavity.</p>

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