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Purpose: The purpose of this in vitro study was to evaluate marginal fit of cobalt- chromium (Co-Cr) copings fabricated by direct metal laser sintering system (DMLS) and conventional lost-wax technique (LW). Materials and method: Forty tooth preparations were carried out over extracted mandibular molars. They were divided into two groups A and B of 20 each. For group A Co-Cr copings were fabricated by direct metal laser sintering (DMLS) and for group B by lost wax technique (LW). Glass –ionomer cement (GIC) was used to tack the copings over their preparations. Marginal fit was then evaluated directly under the stereomicroscope. Results: The mean marginal gap of group A was 27.9 ± 2.4 μm and group B was 40.4 ±6 μm. Statistical analysis using t - test showed highly significant difference (P>.05) between the marginal mean of the DMLS (group A) compared to LW (group B). Conclusion: The DMLS copings demonstrated superior marginal fit compared to that of conventional Co-Cr casted copings.

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Lip has an important role in esthetics and phonetics of an individual. Damage to marginal mandibular nerve leads to loss of motor function and muscle tone of the affected side of lip. Eventually, it leads to loss of both primary functions of lip. Various surgical approaches of treatment do exist, but the treatment time is long and results are often not satisfactory. Prosthetically, these patients can be managed with the help of lip plumber prosthesis. This case report presents simple and accurate method to restore the harmonious relation of the lip.