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Comparative Evaluation of Marginal and Internal Gap of Co–Cr Copings Fabricated from Conventional Wax Pattern, 3D Printed Resin Pattern and DMLS Tech: An In Vitro Study

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The Journal of Indian Prosthodontic Society

Abstract

Accuracy of the fit of the restoration has always remained as one of the primary factors in determining success of the restoration. A well fitting restoration needs to be accurate both along its margins and internal surface. This study was conducted to comparatively evaluate the marginal gap and internal gap of cobalt–chromium (Co–Cr) copings fabricated by conventional casting procedures and with direct metal laser sintering (DMLS) technique. Among the total of 30 test samples 10 cast copings were made from inlay casting wax and 10 from 3D printed resin pattern. 10 copings were obtained from DMLS technique. All the 30 test samples were then cemented sequentially on stainless steel model using pressure indicating paste and evaluated for vertical marginal gap in 8 predetermined reference areas. All copings were then removed and partially sectioned and cemented sequentially on same master model for evaluation of internal gap at 4 predetermined reference areas. Both marginal gap and internal gap were measured in microns using video measuring system (VMS2010F). The results obtained for both marginal and internal gap were statistically analyzed and the values fall within the clinically acceptable range. The DMLS technique had an edge over the other two techniques used, as it exhibited minimal gap in the marginal region which is an area of chief concern.

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Acknowledgments

My sincere thanks to Professor Dr. Karthik Bhanushali, Imaginarium Dental Lab, MIDC, Andheri East, Mumbai, for helping me with 3 dimensional printing (3DP), Mr. Nirav Jain Director (Dental Ceramists India. Pvt. Ltd) Bandra West Mumbai, for providing Direct Metal Laser Sintering (DMLS) Machine. I would like to thank the Department of Mechanical Engineering, Anna University for helping me in measuring the values with the help of Video Measuring System (VMS2010F).

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Authors and Affiliations

  1. Thai Moogambigai Dental College and Hospitals, Chennai, Tamil Nadu, India

    Eswaran Bhaskaran, T. Ilango & G. Phani Krishna

  2. Ragas Dental College and Hospitals, Chennai, India

    N. S. Azhagarasan & Saket Miglani

  3. Karpaga Vinayaga Institute of Dental Sciences, Chennai, India

    B. Gajapathi

  4. No. 20, Amirtha Illam, Mohamed Hussain Colony, 3rd Street, Kolathur, Chennai, 600099, Tamil Nadu, India

    Eswaran Bhaskaran

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  1. Eswaran Bhaskaran
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  2. N. S. Azhagarasan
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  3. Saket Miglani
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Correspondence to Eswaran Bhaskaran.

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Bhaskaran, E., Azhagarasan, N.S., Miglani, S. et al. Comparative Evaluation of Marginal and Internal Gap of Co–Cr Copings Fabricated from Conventional Wax Pattern, 3D Printed Resin Pattern and DMLS Tech: An In Vitro Study. J Indian Prosthodont Soc 13, 189–195 (2013). https://doi.org/10.1007/s13191-013-0283-5

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  • DOI: https://doi.org/10.1007/s13191-013-0283-5

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