Effect of different surface pretreatment methods on repair bond strength of resin composite subjected to pH-cycling

Authors : Fetiye AKIN, Gül DİNÇ ATA

Pages : 1491-1498

Doi:10.32322/jhsm.1133747

View : 20 | Download : 15

Publication Date : 2022-09-25

Article Type : Research Paper

Abstract :Objectives: The aim of this study was to evaluate the effect of two different repair methods insert ignore into journalissuearticles values(Er:YAG laser and bur); with or without silane application on the microtensile bond strength of a nanohybrid resin composite aged with two different aging methods insert ignore into journalissuearticles values(pH cycling and thermocycling);. Material and Method: Resin composite blocks insert ignore into journalissuearticles values(Clearfil Majesty Esthetic, Kuraray, Japan); were randomly assigned into two groups for aging process: insert ignore into journalissuearticles values(a); pH cycling insert ignore into journalissuearticles values(b); thermocycling insert ignore into journalissuearticles values(5,000 cycles);. After aging, the blocks were assigned to one of the following repair procedures: insert ignore into journalissuearticles values(1); Er:YAG laser insert ignore into journalissuearticles values(LightWalker STE-E, Fotona Medical Lasers, Ljubljana, Slovenia); insert ignore into journalissuearticles values(2); Er:YAG laser+silane insert ignore into journalissuearticles values(3); bur insert ignore into journalissuearticles values(4); bur+silane and insert ignore into journalissuearticles values(5); no-pretreatment group and insert ignore into journalissuearticles values(6); Cohesive control insert ignore into journalissuearticles values(cohesive strength of the resin);. Resin composite insert ignore into journalissuearticles values(Clearfil Majesty Esthetic); was bonded to the conditioned substrates incrementally and light polymerized. Repaired samples were thermocycled insert ignore into journalissuearticles values(5.000 cycles);. The microtensile bonding test was performed. The data were analyzed using Scheirer-Ray-Hare, Kruskal-Wallis Mann-Whitney U tests, Chi-square and Z tests with Bonferroni correction insert ignore into journalissuearticles values(p=0.05);. Results: No statistically significant difference was found between the aging methods applied to filling material insert ignore into journalissuearticles values(p=0.821); and the interaction of applied surface treatments and aging insert ignore into journalissuearticles values(p=0.289);. All repair procedures achieved bond strength values higher than the no-pretreatment group but they did not reach the resin composite’s cohesive bond strength. Failure modes distribution was found statistically different according to repair procedure and also aging methods insert ignore into journalissuearticles values(p<0.05);. Conclusion: The bond strengths of the resin composites were similar to those of applied thermal cycling and the pH cycling model with no difference between the different repair methods.
Keywords : Aging, dental restoration repair, lasers, pH, silanes