Surface roughness and bond strength of enamel to composite

摘要

Objectives: The aim of the study was to assess the influence of pretreating enamel by different rotary instruments on shear-bond strength of composite to enamel after the acid etch technique. Methods: Ninety human enamel specimens with transversely and longitudinally sectioned prisms were ground flat, and half of the enamel Area of each specimen was prepared with one of the eight different rotary instruments; a 120 μm diamond bur, three finishing diamonds (30, 15 and 8 μm), two tungsten carbide finishing instruments (8-and 30-fluted) and two stones (Dura green and Dura white).