Immediately after development of composite resin, it was used not only as filling material but also as the core material. Clearfil core, which came on market in 1980, was widely accepted in dental practice, resulting in many failures because of insufficient bond strength to dentin.
Since then, high polymer science has made rapid progress, and now a lot of adhesive resin core materials are available with high bond strength to dentin. It is time to check the efficiency of these materials in practice.
In this study, each component and its mutual relationship of the composite resin core with prefabricated metal posts were examined. As a result, the resin core with prefabricated posts indicated the same bonding strength as the cast post and core. In addition, core resin could be used as luting materials with better bond strength than conventional adhesive resin cements.
