Year : 2020

Volume : Volume 11

Issue : Issue 3

Address for correspondence :
Dr. Bhumika Sharma.
bhumika.sardana@gmail.com

Abstract

Background: The purpose of the study is to assess the marginal accuracy of the copings fabricated by computeraided milling and direct metal laser sintering (DMLS) systems in comparison to casting method and to evaluate if the fabrication technique can produce prosthesis that is within the standards of clinical acceptance of marginal discrepancy.  Materials and Methods: 20 metal copings each (n=40) were fabricated by laser sintering & traditional casting method. Marginal gap at the buccal, lingual, mesial, and distal areas was measured. Evaluation was done using silicone replica technique. To measure the marginal discrepancy between the working die and the copings, stereomicroscope microscope were used. Statistical analysis was done using t-test using Open-epi calculator software.  Results: The results showed significant difference in the marginal accuracy of Co-Cr metal copings fabricated using the two different techniques. The values indicated that the marginal gap was less for the copings fabricated using Co-Cr alloy crowns fabricated with direct metal laser sintered technique than Co-Cr alloy crowns fabricated with conventional casting technique.

Keywords: Direct metal laser sintering, Conventional casting, Marginal fit, Marginal accuracy.