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ISSN: 2376-032X

JBR Journal of Interdisciplinary Medicine and Dental Science
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Research Article

Effect of Shoulder and Deep Chamfer Finish Lines on Marginal Fitness of Electroformed P.F.M. Restorations

Nina Rahshenas1, Mohammad Hosein Kalantar Motamedi2*, Mohammad Sadegh Nazari3, Mohammad Hasan Salari4 and Bita Modaber4

1Department of Prosthodontics, Faculty of Dentistry, Tehran Azad University of Medical Sciences, Tehran, Iran

2Department of Oral and Maxillofacial Surgery, Trauma Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran

3Tehran Azad University of Dentistry, Tehran, Iran

4Department of Prosthodontics, Faculty of Dentistry, Tehran Azad University of Medical Sciences, Tehran, Iran

Corresponding Author:
Mohammad Hosein Kalantar Motamedi
Professor of Oral and Maxillofacial Surgery
Trauma Research Center
Baqiyatallah University of Medical Sciences, Tehran, Iran
Tel: 09121937154

Received date: June 11, 2014; Accepted date: August 04, 2014; Published date: August 11, 2014

Citation: Rahshenas N, Motamedi MHK, Nazari MS, Salari MH (2014) Effect of Shoulder and Deep Chamfer Finish Lines on Marginal Fitness of Electroformed P.F.M. Restorations. J Interdiscipl Med Dent Sci 2:145. doi: 10.4172/2376-032X.1000145

Copyright: © 2014 Rahshenas N, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.



Objective: Comparison of the effect of shoulder with deep chamfer finish lines in P.F.M restorations using electroforming.

Method: This experimental study was performed on 20 samples that were randomly selected. Two cutting designs shoulder and deep chamfer were created on dies via a standard turning machine. The diameter rim was 8mm and the height was 6 mm and the depth of cutting edge in cervical area, was 1mm. Impressions were made from dies and 10 acetone dies were prepared for each group. Silver was used on the dies to the finish line and a copper wire was connected to the die by making a foramen 1 mm away from finish line. The collection of die and wire were attached to the head of electroforming machine and gold cooping was created with electroforming. The gap between the die and the crown was measured by electron microscope; data was recorded and evaluated by the t-test.

Results: According to statistical data, the average gap in shoulder lathe was 24.42 microns and in deep chamfer was 20.66 microns.

Conclusions: The deep chamfer design in electroforming method had a better marginal fitness in comparison to the shoulder design.


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