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10 Mar 2024 (Vol 47 , Iss 03 )

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31 Mar 2024 (Vol 47 , Iss 03 )

Journal ID : TMJ-19-03-2023-11520
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Title : Evaluation of Marginal Fit of Metal Core Fabricated by 3D Printing technique, milled wax/lost wax technique and Conventional lost wax technique.

Abstract :

The high strength metal ceramic crowns have been extensively used in dentistry However, the fit is the most encountered problems in porcelain fused metal crowns. This mainly depends on the fabrication technique. The purpose was to compare the marginal fit of three techniques: direct laser metal sintering (DLMS) and milled wax with lost wax method (MWLW) and Conventional lost wax method. Thirty Cobalt-Chromium dies of dimension 5-mm height and a 0.5-mm chamfer finish line with a 12-degree angle of occlosal convergence. thirty dies were divided into three groups containing 10 samples each. All 30 dies were scanned using (Medit) scanner and data were used to fabricate metal copings using Laser sintering technique (Group-1), milled wax with lost wax method (Group-2) and Conventional lost wax method (Group-3). The study was done directly scanned under stereomicroscope at 50 x magnification for marginal fit evaluation. Differences in marginal gap were noted. Laser-sintered showed significantly smaller spaces between coping and abutment than milled wax/lost wax copings While the spaces was greater in the Conventional lost wax method. Laser-sintered Co-Cr crown copings showed better marginal fit than copings produced by milled wax/lost wax technique and Conventional lost wax technique.

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