Effect of Storage Time, Thermocycling And Resin Coatingon Durability of Dentin Bonding Systems

Background: Along with development of different dental adhesives, concerns about hydrolytic degradationof the adhesive components have arisen. The purpose of this study was to evaluate the invitroinfluence of thermocycling, water storage and resin coating on the microshear bond strength oftotal etch and self etch adhesive systems to dentin.Methods: The superficial coronal dentin of eighty intact third molars were exposed and divided into5 equal groups. Dental adhesives including Scotch Bond Multi Purpose (SBMP), Single Bond (SB),Clearfil SE Bond (CSE), Prompt L-Pop (PLP), and Prompt L-Pop plus Margin bond (PLPM) wereapplied according to the manufacturers’ instructions on prepared surfaces in the study groups, respectively.Then composite cylinders were bonded and specimens were divided into two subgroups. Onesub group was stored in water for 24 hours. The second subgroup was subjected to 3000 thermocycleshocks and then was stored in 37°C water for 3 months. Finally, all teeth were subjected to the microshearbond strength test. Data were analyzed using two-way ANOVA and Tukey HSD tests. Onespecimen similar to each subgroup was also prepared for SEM evaluation.Results: After one-day storage, the SBMP showed the highest bond strength followed by CSE,PLPM, SB and PLP. After three months storage, the highest bond strength was observed in SBMPfollowed by PLPM, CSE, SB, and PLP.Conclusion: SBMP showed the best bond strength while CSE represented acceptable bond durability.Resin coating on PLP improved bond strength and durability.