Effects of storage conditions and type of tooth on marginal leakage of composite resin restorations

Abstract

I investigated the effects of storage conditions and type of tooth (human or bovine) on marginal leakage in coronal and cervical composite restorations. Coronal and cervical cavities were prepared in each tooth, which was then treated with one of two dentin bonding systems, and restored with composite resin. All specimens were then immersed in distilled water at 37℃. After either a penetration test or thermal cycle test in a dye solution, marginal leakage of the specimens was evaluated and the cavity margin was observed by scanning electron microscopy. Differences in storage conditions and type of tooth markedly influenced the degree of marginal leakage.