Journal of AdvancedMedical and Dental Sciences Research

Background: Marginal adaptation of coping over an implant abutment gauges the overall cast restoration acceptability for favorable clinical outcome. Fabrication of metal copings over implant abutments is technique sensitive. Paucity of comparative studies evaluating vertical marginal fit of metal copings made-up by CAD/CAM with conventional technique exist. This invitro study evaluate and compare between vertical marginal fit   of  Metal copings fabricated by  three different techniques  over Implant abutments through    Milled  CAD/CAM technique, Milled wax, and  Free Hand Wax method by Conventional Casting Technique.  Methods: To conduct this invitro comparative study a total of 45 metal coping samples 15 in each of three groups were prepared under standard laboratory conditions. Group I, copings were fabricated from Milled Co-Cr (MC) blocks by the CAD/CAM technique, Group II copings were fabricated from Milled wax with Conventional Casting technique. Group III, copings were fabricated from Free Hand Wax pattern (FW) and Conventional Casting technique. The Vertical marginal fit of samples was evaluated by Stereomicroscope (50x). Data entry & scrutiny was done by SPSS Version 15.0. ANOVA &Tuckey test showed Intragroup and intergroup variation set at P<0.05 (95% CI) as significant.Results: CAD/CAM milled copings showed better marginal fit when compared with copings fabricated by conventional casting technique.   Conclusions:Milled CAD/CAM technique for coping over implant abutment having least vertical marginal discrepancy is substantiated in this invitro study directing further studies on this perspective.
Keywords: Implant abutment, Metal coping, CAD/CAM milled coping, Vertical marginal fit, Stereomicroscope.

Received: 13 March, 2019                                         Revised:  22 April 2019                             Accepted: 25 April 2019

Corresponding Author: Dr. Mahesh Suganna, B.D.S, M.D.S., Professor, Department of Prosthodontics and Oral Implantology, I.T.S Centre for Dental Studies and Research, Muradnagar, Ghaziabad – 201206 (New Delhi NCR), India

This article may be cited as: Bhasin R, Suganna M, Kumar M, Gupta S, Bhargava A, Kaul S. To evaluate and compare the vertical marginal fit of metal copings fabricated from free hand wax patterns and milled wax patterns using conventional casting technique with CAD milled copings - An in vitro study. J Adv Med Dent Scie Res 2019;7(7): 178-182.