Microleakage of CAD-CAM porcelain estorations

Purpose: To evaluate the microleakage of CAD-CAM porcelain inlay restorations cemented with four different dual cure resin cements. Materials and Methods: Thirty human extracted caries-free molar teeth were prepared with a Class II MOD cavity design. One proximal box ended on enamel and the other on root surface dentin. The teeth were divided into six groups of five samples each. Two groups were restored with a direct placement composite resin to serve as a control. The other four groups were restored with CAD/CAM-generated ceramic inlays that were cemented with four dual cure resin cements. All specimens were thermocycled. Microleakage of the restorations was assessed by dye penetration. Results: Compared to direct placement resin composite which demonstrated an excellent enamel marginal seal, CAD/CAM-generated porcelain inlays produced excellent marginal seals at both the enamel and dentin interfaces.