Effect of acid etching time on the degradation of resin-dentin bonds in primary teeth.

Purpose: To investigate the influence of etching time on the degradation of resin-dentin bonds produced in primary teeth.

Methods: 40 primary molars were randomly divided into four groups according to the adhesive system, Single Bond (SB) and Clearfil SE Bond (CSEB), and acid etching time. SB was applied to dentin after phosphoric acid etching for 15 or 7 seconds, whereas CSEB was applied after the application of SE Primer for 20 or 10 seconds.