World Journal of Dentistry

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VOLUME 3 , ISSUE 1 ( January-March, 2012 ) > List of Articles

RESEARCH ARTICLE

Evaluation of Electric Discharge Machining to achieve Passive Fit of Implant Superstructure: An in vitro Study

Siddharth Shah

Citation Information : Shah S. Evaluation of Electric Discharge Machining to achieve Passive Fit of Implant Superstructure: An in vitro Study. World J Dent 2012; 3 (1):32-36.

DOI: 10.5005/jp-journals-10015-1124

Published Online: 00-03-2012

Copyright Statement:  Copyright © 2012; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Objective

To evaluate marginal discrepancies between cast implant superstructure and EDM processed implant structure.

Materials and methods

For the purpose of this study, an experimental model was prepared on which nine cast implant superstructure in nickel-chromium were fabricated which was then subjected to EDM processing. One-screw test was used to verify fit of superstructure both pre- and post-EDM processing. Photo/Image analyzer was used to evaluate the marginal discrepancy. To reduce the error of measurement, nine readings were taken of each implant abutment junction, i.e. overall 324 readings pre- and post-EDM processing was made.

Results

All implant superstructure fabricated by investment casting procedure in nickel-chromium alloy showed negative one-screw test, i.e. they were fitting actively on abutment head and were sitting passively after EDM processing. Mean marginal opening of cast implant superstructure before EDM processing was 95.93 microns and 22.76 microns after EDM processing.

Conclusion

Nickel-chromium alloy can be used for fabrication of implant superstructure with EDM as programmed refining procedure to achieve passive fit.

How to cite this article

Shah S. Evaluation of Electric Discharge Machining to achieve Passive Fit of Implant Superstructure: An in vitro Study. World J Dent 2012;3(1): 32-36.


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