Comparison of microleakage and thickness of resin cement in ceramic inlays with various temperatures

microleakage is still one of the major problems of composite based restorations. This study compared the microleakage and thickness of resin cement in ceramic inlays with various temperatures. Class V cavities were prepared in the buccal and lingual side of thirty human molars with occlusal margin in enamel and gingival margin in dentin (3mm width, 5mm length and 2mm depth). laboratory-made inlays (LMI) used for buccal cavities, and CAD/CAM made inlays (CMI) used for lingual cavities. All cavities were divided into six groups (n=10): 1: LMI in -5.c 2: LMI in 50. c 3: LMI in room temperature (25.c) 4: CMI in -5.c 5: CMI in 50. c 6: CMI in room temperature (25.c) Inlays bonded to cavities in the pulp pressure and temperature simulator device. After thermocycling and dye penetration, teeth divided in two mesiodistally halves. Amount of dye penetration and film thickness was measured by stereomicroscope and analyzed with kruskal-wallis, wilcoxon and spearman correlation tests.(ɑ= 0.05) There was no statistically significant difference between leakages in the different inlay temperatures (P value˃0.05). The mean cement thickness in of laboratory made inlays(gingival margin (83.7±11),occlusal margin (84.7±19))was greater than the CAD/CAM inlays(gingival margin(69±16), occlusal margin (84.7±16)). No correlation was found between cement thickness and microleakage either in enamel or dentin for any of the ceramic systems. The different temperature of inlays had no effect on microleakage. CAD/CAM inlays had lesser cement thickness than laboratory made inlays, but this was not related to their microleakage.