Shear bond strength and ultrastructural interface analysis of different adhesive systems to bleached dentin.

Background: It remains unclear as to whether or not dental bleaching affects the bond strength of dentin/resin restoration.

Purpose: To evaluated the bond strength of adhesive systems to dentin submitted to bleaching with 38% hydrogen peroxide (HP) activated by LED-laser and to assess the adhesive/dentin interfaces by means of SEM.

Study Design: Sixty fragments of dentin (25 mm²) were included and divided into two groups: bleached and unbleached.