survey on the effect of etching time on shear bond strength of single bond in the dentin of primary teeth

This study was carried out to assess the effect of etching time on the shear bond strength of single bond to primary teeth. Methods & Materials: Two groups, in each group diamond disc to 1.5 mm depth. Group 1 was etched for 7 seconds and group 2 was etched for 15 seconds with 37% phosphoric acid gel. After etching the teeth were rinsed and dried. Single bond was used in two layers and extend along the tooth surface by air and then light cured for 10 seconds. The Z100 (3M) composite was used in same sylanders with 3.2 mm diameter and 5 mm height and cure for 40 seconds. The mean of shear bond strength of groups were: M1: 15.58, M2:13.5 = t test S1:1.12, S2:1.21 T test analysis was shown that the difference between two groups is significant (P<0.0001). Reducing etching time for 15s to 7s leads to increasing shear bond strength of single bond to dentin of primary teeth.