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International Journal of Dentistry
Volume 2010, Article ID 521470, 5 pages
http://dx.doi.org/10.1155/2010/521470
Research Article

Marginal Strength of Collarless Metal Ceramic Crown

1Department of Maxillofacial Prosthodontics and Implantology, AIIMS Dental College and Hospital, New Delhi 110012, India
2Department of Maxillofacial Prosthodontics and Implantology, HKE’S S. Nijalingappa Institute of Dental Sciences & Research Centre, Gulbarga 585104, India

Received 12 August 2009; Revised 29 January 2010; Accepted 15 March 2010

Academic Editor: Alessandro Dourado Loguercio

Copyright © 2010 Sikka Swati 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

Metal ceramic restorations have been implicated for the discoloration in area of labiogingivalmargin. Attempts to rectify this, by altering the design of metal frameworkswill lead to decrease in fracture strength atmargin. This in vitro study compared the fracture strength at margins of metal ceramic crowns cemented to metal tooth analogs. Crowns evaluated with different marginal configurations, shoulder and shoulder bevel with 0 mm, 0.5 mm, 1 mm, and 1.5 mm, were selected. Methods. Maxillary right canine typhodont tooth was prepared to receive a metal ceramic crown with shoulder margin. This was duplicated to get 20 metal teeth analogs. Then the same tooth was reprepared to get shoulder bevel configuration. These crowns were then cemented onmetal teeth analogs and tested for fracture strength atmargin on an Instron testing machine. A progressive compressive load was applied using 6.3 mm diameter rod with crosshead speed of 2.5 mm per minute. Statisticaly analysis was performed with ANOVA, Student's “ ” test and “ ” test. Results. The fracture strength of collarless metal ceramic crowns under study exceeded the normal biting force. Therefore it can be suggested that collarless metal ceramic crowns with shoulder or shoulder bevel margins up to 1.5 mm framework reduction may be indicated for anteriormetal ceramic restorations. Significance. k Collarless metal ceramic crowns have proved to be successful for anterior fixed restorations. Hence, it may be subjected to more clinical trials.