Abstract
The purpose of this study was to investigate the influence of the ground depths of the enamel and etching times on the adhesion of the resin on the ground enamel.
Seventy-five extracted and frozen bovine mandibuler young permanent incisors were used. The etchant used in this study was 40% phospholic acid gel and the etching times were 0,10,20,30 and 60 seconds. All of the specimens were washed with an air water spray for 30 seconds after etching. The bonding agent and composite resin used in this study were Photo Bond and Photo Clearfil A (Kuraray Co. ). Shear bond strengths to the outer enamel layers and inner enamel layers of the same teeth were measured. After the shear bond strength test, all the test surfaces of the enamel and resin specimens were observed using the SEM.
