Effects of Pretreatment Procedures on Shear Bond Strength in Repair of Composite Resin Restorations

Abstract

 Purpose: We examined the effects on composite resin filling repair of differences in pretreatment conditions (e. g., primer treatment) and the surface roughness of the adhesive surface.
 Methods: Two types of resin, namely, Clearfil AP-X (AP) and Beautifil Flow F02 (BE), which differed in composition and fluidity, were compared under various pretreatment conditions (no treatment, bonding treatment (Clearfil Photo Bond), silane coupling treatment (Clearfil Photo Bond and Clearfil Porcelain Bond mixture)) for different adhesive surfaces (pressure-contact surface or diamond-point ground surface). Filling was performed with the same resin material as the adhesive surface, and the shear bond strength was compared after the resins were stored for 1 week in water.
 Results: When comparing between the adhesive surface types, a significant difference in shear bond strength was observed for only BE with bonding treatment, and no significant differences were observed for the other BE cases or any of the AP cases. When comparing between the adhesion treatments, the bonding treatment group and the silane coupling group for AP with the pressure-contact surface exhibited a significant difference in shear bond strength compared with the no-treatment group. In the case of BE, significant differences were observed in the case of the diamond-point ground surface and silane coupling processing. On the pressure-contact surface, a significant difference was observed only between no treatment and silane coupling treatment.
 Conclusion: The effective method for treating the adhesive surface differs depending on the composite resin, and it is necessary to perform the surface treatment that is optimal for the composite resin to be applied. Good fluidity of the component resin is effective for ensuring good adhesive properties.