Adhesion theory and its application I．接着の基本概念

Abstract

“Adhesion” is a phenomenon in which the surface of adherend and the adhesive material are united by chemical and/or physical force. The mechanisms of adhesion in the oral cavity are explained as resulting mainly from chemical bonds such as van der Waals forces and hydrogen bonds, and mechanical bonds. In order to obtain strong adhesive force, the adhesive materials are desired to have good wettability (i.e., lower contact angle) on the adherend surface and the surface tension at the interface between adherend surface and adhesive is required to be lowered. For the cases of adhesive bridge made of precious alloy, application of primer treatment with a sulfur-containing adhesive monomer to alloy surface is preferable. Besides, Rocatec treatment achieved by a tribochemical reaction to the zirconia surface is believed to be effective surface treatment to the adhesive bridge of zirconia. In addition, the adhesive resin cement, which has high mechanical strength and adhesive strength, is recommended to use in cementing the adhesive bridge.