In vitro evaluation of fit of adhesively luted ceramic inlays

Purpose: The purpose of this study was to evaluate both marginal and overal l adaptation of 4 adhesively luted ceramic inlay systems. Materials and Met hods: A total of 40 extracted teeth were restored with mesio-occlusodistal ceramic inlays using 4 different techniques: Colorlogic, IPS Empress, Celay direct, and Celay indirect. After cementation with a resin luting agent, t he samples were sectioned along a mesiodistal line passing through the cent er of the restoration. The thickness of the cement was measured at the marg ins and at several points along the inside of the restorations by means of a stereomicroscope fitted with a measuring grid. Results: The results were analyzed by one-way analysis of variance. The marginal precision of IPS Emp ress and Colorlogic inlays averaged below 50 mu m. Marginal precision of Ce lay inlays averaged between 110 and 130 mu m. IPS Empress and Celay inlays showed a uniform distribution of the cement along the entire prepared surfa ce. Colorlogic inlays showed an uneven distribution of the cement film. Con clusion: IPS Empress inlays showed the best clinical features compared to C olorlogic and Celay inlays.