Effect of surface moisture on dentin bond strength of resin cements

Abstract

The purpose of this study was to investigate the influence of surface moisture on dentin bond strength of resin cements that employ self-etching primers. Four resin cements, Bistite II (Tokuyama Dental), Link Max (GC), Multi Bond (Tokuyama Dental), and Panavia Fluoro Cement (Kuraray Medical) were used. Bovine mandibular incisors were used as a substitute for human teeth. After rinsing with three-way syringe, labial surfaces of incisors were divided into three groups; 1) dry with three-way syringe for10sec, 2) dry with three-way syringe for 2 sec, and 3) blot dry. A stainless mold was bonded with resin cements. After storage in 37°C distilled water for 24 h, ten specimens per group were tested in a shear mode at a crosshead speed of 1.0 mm/min. The wet condition of the dentin surface tended to decrease the bond strength compared with those of the dry condition except for Multi Bond. There was no significant difference among three conditions for Multi Bond. The etching effect of self-etching primers might be weakened by the moisture condition of dentin surface. Care should be taken on the moisture conditions of dentin surface when using these resin cements utilizing self-etching primers.