Evaluation of cavity adaptation of low-shrinkage composite resin

Abstract

Purpose: The purpose of this in vitro study was to evaluate cavity adaptation of a low-shrinkage composite resin lining with or without a flowable composite resin.

Materials and Methods: One-mm-deep dentin and 2-mm-deep enamel-dentin cylindrical class I cavities were prepared and restored with a self-etch adhesive and either of a low-shrinkage composite or a conventional composite resin (1-mm-deep and 2-mm-deep cavities) and with or without a flowable composite (2-mm-deep cavity). Samples were crosscut and evaluated for gap formation using a digital microscope.

Results: Slight gap formations were observed at resin-cavity interface in all groups. There was no statistical difference of the gap formation among experimental groups.

Conclusion: Cavity adaptation of a low-shrinkage composite resin was comparable to that of a conventional composite resin. Intermediate layer of a flowable composite did not improve the adaptation at resin-cavity interface.