Influence of different photoinitiators on the resistance of union in bovine dentin: Experimental and microscopic study.

Background: To evaluate the influence of photoinitiators on the microtensile strength of adhesive systems and composite resins in bovine dentin.

Material And Methods: Forty dentin obtained from bovine teeth were randomly distributed in four groups (n = 10) according to the different adhesive systems and composite resins used: G1 - AAPS + VAPS (Ambar APS + Vittra APS); G2- AAPS + O (Ambar APS + Opallis); G3 - A + VAPS (Ambar + Vittra APS) and G4 - A + O (Ambar + Opallis). After restoration with the composite, the samples were sectioned to obtain toothpicks that were subjected to the microtensile and nanofiltration test (1.