Table of Contents
ISRN Dentistry
Volume 2011, Article ID 810565, 7 pages
http://dx.doi.org/10.5402/2011/810565
Research Article

Effect of Margin Design and Processing Steps on Marginal Adaptation of Captek Restorations

Department of Restorative Dentistry, New Jersey Dental School, UMDNJ 110 Bergen Street, Newark, NJ 07103, USA

Received 18 April 2011; Accepted 9 May 2011

Academic Editors: G. Sjogren and C. G. Widmer

Copyright © 2011 Amy Shih et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study examined the effect of four margin designs on marginal adaptation of Captek crowns during selected processing steps. Twenty-four Captek crowns were fabricated, six each of four margin designs: shoulder (Group A), chamfer (Group B), chamfer with bevel (Group C), and shoulder with bevel (Group D). Marginal discrepancies between crowns and matching dies were measured at selected points for each sample at the coping stage (Stage 1), following porcelain application (Stage 2) and cementation (Stage 3). Digital imaging methods were used to measure marginal gap. The results indicate decreasing trend of margin gap as a function of margin design in the order A>B>C>D. Between processing steps, the trend was in the order Stage 3 < Stage 1 < Stage 2. Porcelain firing had no significant effect on marginal adaptation, but cementation decreased the marginal gap. Generally, the margin gap in Captek restorations were in all cases less than the reported acceptable range of margin gaps for ceramometal restorations. These results are clinically favorable outcomes and may be associated with the ductility and burnishability of matrix phase in Captek metal coping margins.