This study evaluated the effect of an MDP-containing cleaner on the bond strength of a self-adhesive resin composite (SAR) to saliva-contaminated bovine root dentin. Dentin surfaces were ground with #600 SiC and contaminated with artificial saliva for 20 s. Specimens were divided into four groups: water rinse (WA), 10% citric acid-3% ferric chloride solution (10-3), MDP-containing cleaner (KC), and non-contaminated (NC). SAR was applied according to the manufacturer’s instructions. After 24 h of water storage at 37°C, μTBS was measured (n=10). KC showed no significant difference in μTBS compared with the NC (p>0.05), while no measurable bond strength was obtained for the WA and 10-3. Mixed failures comprising cohesive failure within dentin, cohesive failure within resin, and adhesive failure at the dentin–resin interface were more frequent in the NC. KC effectively removed contaminants and restored bonding performance. This method offers a promising restorative protocol for challenging clinical settings.
SHIMIZU et al. (Thu,) studied this question.