Resistência de união de compósitos ao cimento submetido a diferentes tratamentos mecânicos.

Abstract

Tooth Coronary destruction could lead an indirect reahbilitabtion. The composite resin modify the surface of dentine to prepare tooth, creating different surface. Mechanical treatments can be used priviously to chemical treatments. That treatment change the surface roughness and clean of temporary cement. The objective of this article is to evaluate the adhesion and the roughness generated by the mechanical treatments on the aged resin. The composite resin samples were treated following mechanical treatments: diamond burs (BD), aluminum oxide jet (JOAl), ultrasonic (Ul), except for the control group. Forty-eigth specimens were divided for the microtensile test and 12 for the roughness and MEV (VEGA 3 LMU, Tescan, Czech Republic). After the chemical treatment with universal adhesive the sample were fixed with resin cement. The bond strength test was the microtensile test. The roughness of UI (1.45±0.51) and JOAI (1.38 ±0.48) groups were statistically similar and presented the highest surface values. Theses groups were statistically different from the BD group (1.1±0.47) and the control group (0.061 ± 0.03) in the microtensile test. GC and UI groups have no statistically difference. However, presented diference to the JOAI and BD groups, which were similar among themselves. In addition, the MEV showed differnece in the treatments topography. It concludes that the use of ultrasonic tips is a surface cleaning method that presented the best results of surface roughness and bond strength.