Effect of two cavity designs on root surface marginal microleakage.

Current methods for bonding composite resins rely upon the etching of enamel to attain a bond that is strong enough to resist polymerization shrinkage and decrease the amount of marginal microleakage. Previously, modification of cavity designs have been evaluated that have enhanced retention. However, all these cavity designs have utilized methods to increase the surface area of enamel to bond thus resulting in a stronger enamel bond. This in vitro study evaluated the effect of one cavity design modification when the restoration is placed entirely on cemental surfaces and relied on only cementum and dentin.