Microshear bond strength of two types of universal adhesives to primary dentin using self-etch and total-etch techniques

This study aimed to compare the microshear bond strength (µSBS) of two types of universal adhesives to primary dentin following self-etch (SE) and total-etch (TE) techniques.

In this in vitro experimental study, 50 extracted sound primary first and second molars were randomly assigned into five groups (n=10). The groups were treated as follows: All Bond Universal (ABU) using the self-etch (SE) technique, Scotchbond Universal (SBU) using the SE technique, ABU using the total-etch (TE) technique, SBU using the TE technique, and Adper Single Bond 2 (ASB2) as the control group, after exposing the occlusal dentinComposite cylinders were bonded to dentin and underwent µSBS test. Data were analyzed by two-way ANOVA and Tukey’s test (alpha=0.05).

All experimental groups showed significantly lower µSBS than the control group (P<0.05). However, the difference in µSBS was not significant among the experimental groups (P>0.05).

The results showed higher µSBS of ASB2 (fifth-generation adhesive) than both universal adhesives (SBU and ABU) in SE and TE techniques. The µSBS to primary dentin depended on both adhesive type and technique.