Bond strength and marginal closure of newly developed adhesive cements.

Since luting cement is used for fixing cast restorations to their abutments, the cement surface at the junction between cast and tooth is exposed to oral environment. The conventional cement so far used does not adhere to the tooth and is slightly soluble into saliva and gingival fluid1,2). Consequently, the microleakage and subsequent recurrent caries seem to develop at this junction. Recently, adhesive cements (compoiste resin type and 4-META type) which possess chemical adhesive property not only to tooth but also to various dental alloys were explored3). We evaluated the bonding ability and the extent of microleakage of two types of adhesive cement and compared them to those of conventional cements (zinc phosphate, glass ionomer) by dye-penetration in thermal cycle test.