Nd : YAG laser influence on tensile bond strength of self-etching adhesivesystems

Objective: We evaluated the tensile bond strength of composite resin on ena mel and dentine, treated with Nd:YAG laser before and after bonding procedu res, Background Data: The use of laser radiation in dentistry is being deve loped day by day. One of the possible applications of dental lasers include s increasing the quality of self-etching bonding systems. Methods: Forty-ei ght human teeth were used and separated into six groups: Group 1 (enamel co ntrol), Clearfil Liner Bond 2V (CLB 2V); group 2 (enamel), Nd:YAG + CLB 2V; group 3 (enamel), CLB 2V + Nd:YAG; group 4 (dentine control), CLB 2V; grou p 5 (dentine), Nd:YAG + CLB 2V; group 6 (dentine), CLB 2V + Nd:YAG, Tensile bond strength was performed. Results: Enamel means (15,54) were lower than dentine means (20,38), Bond strength of laser before (15,73) was lower tha n laser after (20,65), Interaction results G1 x G3; G2 x G3; G4 x G1; G2 x G5 were statistically significant. Conclusions: Tensile bond strength of co mposites reached with self-etching adhesive systems were greater in dentine than in enamel. The best moment for application of Nd:YAG laser is after t he use of adhesive system. Self-etching adhesive systems tested in this stu dy can be used together with Nd:YAG laser without compromising to adhesion to dentine.