Effects of Er:YAG Laser and 2% Chlorhexidine on Microleakage of a Self-Adhesive Agent (Bond Force) in Class V Composite Restorations
Author(s): Shahin Kasraei, Ahmad Najafi-Abrandabadi, Hadi Kokabi-Arasteh, Mohadese Azarsina*
Introduction: Investigating methods to decrease microleakage can improve the durability of composite resin restorations. Aims: Evaluating the effect of surface treatments with Er:YAG (Erbium:Yttrium-Aluminum-Garnet) laser and chlorhexidine (CHX) prior to a self-etching adhesive on microleakage of class V composite restorations after a 6-months water storage.
Materials and Methods: Class-V cavities were prepared at the cement-enamel-junction of sound premolars (n=16). The study groups were as follows: control (C), 2% CHX application, Er:YAG laser treatment (2940 nm wavelength, 10 Hz pulse repetition rate, 0.5 W power) prior to bonding (Er), and after six months of water storage as follows: CW, CHXW, ErW. After application of Bond Force adhesive (Tokoyama Corp.), the cavities were restored with light-cured composite. The samples were stored in fuschin and marginal microleakage was assessed immediately and after six months of water storage. Data were analyzed by Kruskal-Wallis and Mann-Whitney-U tests (p<0.05).
Results and Discussion: CHX or laser had no significant effect on dentin and enamel marginal microleakage of restorations (P>0.05). Six months of water storage had no significant effect on microleakage at dentin and enamel margins (P>0.05). Microleakage at the enamel margins was lower than dentin margins before and after water storage (P=0.001).
Conclusion: Er:YAG laser or 2% CHX prior to the adhesive application had no effect on microleakage of class-V composite restorations.