Selective masking for thin indirect restorations: Can the use of opaque resin affect the dentine bond strength of immediately sealed preparations?

Purpose te the dentine bond strength using different methods of application of opaque resins to mask dentine discoloration. als and methods e was exposed on 21 extracted molars which were assigned to 3 groups: G1: immediate dentine sealing (IDS). G2: IDS + opaque. G3: IDS with adhesive resin mixed with opaque. After 1 week, teeth were restored and beams were fabricated for microtensile testing. Optical microscopy was used to analyse the failure mode. s trength mean values were statistically different: G1 55.20 MPa > G2 45.79 MPa > G3 18.96 MPa. Failure modes were mostly adhesive for G1 and G3. G2 presented mostly mixed failures. sion e of opaque resin to mask discoloured dentine results in a decrease of bond strength.