The Effect of MTYA·G·H Treatment on the Adhesion between Pulpal Side Dentin and Composite Resin

In this study we investigate the adhesiveness of composite resin on pulpal side dentin treated with the primer MTYA·G·H as compared with that for labial side dentin. Fresh bovine dentin was used; the labial and pulpal surfaces were prepared as adherends. The etching agents were 40% phosphoric acid, 10% citric acid, or 0.5M EDTA (pH 7.4) solutions. Tensile bond strengths were measured after immersion for one day in 37°C water. There was no significant difference between the mean bond strength for labial side dentin and that for pulpal side dentin for each etchant. The highest mean bond strength, about 12MPa, was obtained when pulpal side dentin was etched with EDTA. It is concluded that MTYA·G·H treatment of the deep portions of the dentin is effective in obtaining good adhesion.