2023 Volume 42 Issue 1 Pages 39-44
The performance of adhesive resin materials has been markedly improved and their clinical application is expanding. Even when excellent adhesive resin materials are used in clinics, gap formation in cavity floors and walls is caused by polymerization shrinkage of composite resin. To prevent gap formation in clinical situations, many kinds of research have been conducted. Dentin-bonding performance of recent adhesive resins has markedly improved；however, bonding to caries-affected dentin was known to be weaker compared with bonding to intact dentin. New bonding procedures to caries-affected dentin were developed, and its bonding was improved. Enamel bonding was re-evaluated, and a reliable method of bonding with less invasive surface treatment was also established. A clinical procedure to effectively prevent gap formation in a cavity restored with light-cured composite resin was established and clinically applied. A new application of adhesive resin materials to prevent coronal leakage, which is considered to affect the clinical longevity of restorations applied to non-vital teeth, was also developed. These studies were supported by the development of evaluation methods for bond strength and cavity sealing, such as the new bond test methods and optical coherent tomography.
