Microleakage of Cerec Inlays Cemented with Two Different Cements

Objective:The aim of this in vitro study was to evaluate the microleakage of Cerec inlays at enamel and dentine margins, after cementation with RelyX Unicem (RXU)(3M ESPE) and Excite DSC /Variolink II (EDSCV) (Ivoclar Vivadent). Methods: Standardized class I cavities were prepared on extracted teeth (n=30), sprayed with titanium dioxide powder before taking optical impressions. Cerec 3D class I inlays were fabricated from ProCAD Blocks. Inlays were etched, silanated and cemented with RelyX Unicem or DSC Excite/Variolink II. All samples were thermocycled for 500 (60 sec) cycles, sealed, and immersed in dye for 24 hours and then embedded in clear acrylic resin. Samples were sectioned and examined under light- microscope. Data was collected and analyzed statistically using the Mann Whitney –test.Results: Mean dye penetration scores at the tooth-cement interfaces (n=15) for the different groups were as follows: Enamel margins: RXU = 43, EDSCV = 43; Dentine margins: RXU = 56, EDSCV = 22. There was a statistically significant difference (p<0.05) between the mean dye penetration scores of RelyX Unicem and Excite DSC /Variolink II at the dentine margins. Conclusions: Both cements showed a similar leakage pattern at the enamel margins. RelyX Unicem demonstrated a statistically significant higher degree of microleakage at the dentine margins compared to the Excite DSC /Variolink II combination.