Abstract
New dentin etchants AC (ammonium citrate) were examined. The pH of the AC solution was 7.3∼7.4, and the concentration of the solutions varied from 5% to 30%. The etching of a 10% AC solution was the most effective in improving the adhesion between the composite resin and dentin among the AC solutions employed when MTYA·G·H was used as a dentin primer. The smear layer was removed and the tubules were not generally opened with AC etching. The bond strengths to dentin etched with 10% AC were comparable with those to dentin etched with neutralized 0.5M EDTA or EDTA 3-2. The bond strengths increased with primers MTYA·H and MTYA·G·H, in that order.
