Evaluation of the effect of different finish lines and luting agents on marginal fit and microleakage in direct metal laser sintered copings – an in vitro study

Background & Objectives:. The present study aimed to study the effect of finish line and luting cements on marginal gap and micro leakage in copings fabricated by Direct Metal Laser Sintering (DMLS) Method: 28 maxillary premolars were divided in two groups depending upon finish line design. Co-Cr copings were fabricated with DMLS technique. Ceramic layering was done followed by cementation with two luting agents. These samples were sectioned and marginal gap was measured by stereomicroscope and also calibrated for microleakage. Results: The mean marginal gap value for crowns fabricated by DMLS was 139.73 ± 66.06 µm. The mean marginal gap was least for samples in Group B(b) 105.35±67.25 µm followed by Group B(a) 135.71±19.66 µm; Group A(a) 142.85±71.39 µm and highest value was seen for Group A(b) 175±82.28 µm. 85.7% samples had microleakage. Highest microleakage was seen with samples in Group A(a) and least in Group B(a). None of the values were found to have statistical significance with significance value less than 0.05. Conclusion: There is no effect of finish line or luting cement on the marginal gap or microleakage on metal ceramic crown with copings fabricated by DMLS method.