Evaluation of the tensile bond strength of an adhesive system self-etching in dentin irradiated with Er:YAG laser

摘要

Since Buonocore (1955), several researchers have been seeking for the best adhesive system and treatment for the enamel and dentin surfaces. The use of the acid has been pres ented as one of the best techniques of dentin conditioning , because this promotes the removal of the " smear layer " and exhibition of dentinal structure, for a best penetration and micro- retention of the adhesive system. However, some conditioning methods have been appearing in the literature, for the substitution or interaction with the acid substances, as the laser. The objective of this work is to evaluate the tensile bond strength of the adhesive system " self-etching " associated to a composed resin, in dentin surfaces conditioned with the Er: YAG laser. For this study, freshly extracted human teeth were used and in each one the dentinal surfaces , which were treated with three sandpapers of different granulations (120, 400, 600), to obtain a standard of the smear layer, before the irradiation of the laser and of the restoring procedure. After these procedures the specimens were storage in distilled water at 37 deg C for 24 hours. Soon after, they were submitted to the tensile strength test .After analyzing the results, we can concluded that the use of the Er:YAG laser can substitute the drill without the need of conditioning, when using the adhesive system " self-etching " in the dentinal surfaces because there was a decline in the strength of adhesion in the groups conditioned with the laser.