Evaluation of microtensile bond strength of composite resin repair using different surface treatments
DOI:
https://doi.org/10.7308/aodontol/2012.48.4.05Keywords:
Composite resins, Dentin-bonding agents, Corrective maintenance, Tooth abrasion, Tensile strengthAbstract
Aim: The purpose of this study was to simulate the repair of composite resin restorations by evaluating the composite-to-composite microtensile bond strength test, after applying different combinations of surface treatments.
Materials and Methods: The present study analyzed 180 samples of Tetric Ceram® (Ivoclar/Vivadent) composite resin, distributed in 9 groups (n=20/grupo). At the time of repair, each group received specific surface treatment: 37% phosphoric acid (Ivoclar/Vivadent), 10% hydrofluoric acid (Dentsply), or microjet spraying with 50µm of aluminum oxide particles (Micro Jato VH®). Next, the Heliobond® (Ivoclar/Vivadent) adhesive system was applied, associated or not with the Monobond-S® (Ivoclar/Vivadent) silanizing agent. Specimens were also manufactured but did not undergo any form of repair (control group). These specimens were stored in deionized water for 18 months. After this time, each sample was submitted to microtensile bond strength testing using a universal testing machine (EMIC DL500BF) at a speed of 0.5 mm/minute. The data acquired in MPa was then submitted to a normality evaluation of the microtensile variable by applying the Kolmogorov-Smirnov test. Since the variable did not present normal distribution (p<0.001), the Kruskal-Wallis and Mann-Whitney tests were also performed. The p value was considered significant when less than 0.05, at which time the Bonferroni correction was applied (p<0.00138).
Results: The control group exhibited significantly higher tensile strength values. Group 2 exhibited significantly higher bond strength than groups 1, 3, 4, 5, 6, 7, and 8. Groups 3 and 4 showed the lowest bond strength.
Conclusions: The cohesive strength value of the composite resin was more effective than all the other tested repair techniques. The use of H PO and subsequent applications of the adhesive system proved to be the ideal repair treatment for composite resin restorations
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