Influência de diferentes métodos para a realização de preparos cavitários - alta rotação, laser de Er:YAG e abrasão a ar - sobre a resistência de união de um sistema adesivo à dentina

The aim of this study was evaluated, in vitro, the tensile bond strength to dentin Single Bond (3M) adhesive system applied over surfaces treated with hith-speed handpiece, Er.YAG laser or air abrasion. Thity four enclosed molars extracted due therapeutic indication had been used. teeth sectioned on mesial-distal sense. dental portions included a selfcured acrilic resin and so fourty five samples randomly divided three groups. first group diamond bur plus high-speed handpiece (Kavo) for seconds under water cooling. On used Er:YAG KavoKey enerv 450 mJ/pulse 2 Hz In abrasion Mach 5 (Kreativ) device 27 mm alumina oxide particles powder. After treatments applicd Z 100 composite. test realized universal testing machine EMIC DL-2000 at cross-head speed / minute. average results was: (17,52 MPa), ( 16,65 MPa) 15,83). submitted statistical treatment by ANOVA Tukey's (p ) that showed diffemcc between tested groups not significant.