Microleakage patterns of porcelain and castable ceramic laminate veneers

This investigation evaluated the microleakage of conventional porcelain and Dicor castable ceramic laminate veneers bonded either entirely on acid-etched enamel or with the cervical margins on dentin. Three brands of light-activated composite resin cement systems were used and compared. Laminate veneers were bonded to extracted human maxillary central incisors and the extent of the marginal microleakage was measured. The findings indicated minimal marginal microleakage under both types of ceramic veneers bonded to all-enamel preparations. A markedly greater leakage at the dentin-composite resin interface was observed in veneers with cervical margins placed on dentin.