Laboratory evaluation of marginal porcelain extension on microleakage of base metal crowns

Document Type : original article

Authors

1 Assistant Professor, Dept of Prosthodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran

2 Associate Professor, Dept of Restorative Dentistry, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran

3 Professor, Dept of Prosthodontics, School of Dentistry and Dental Research Center of Mashhad University of Medical Sciences, Mashhad, Iran

Abstract

Introduction:
The purpose of this study was to evaluate the marginal porcelain extension on microleakage of base metal – porcelain crowns when four types of luting cements have been used for cementation.
Materials & Methods:
In this invitro experimental study, ninety six base metal-porcelain crowns with three types of finishing margins were made for premolars. Then they were luted with four different luting cements (zinc phosphate, zinc polycarboxylate, glass ionomer and  Panavia F). Next, they were thermocycled (1000 times). Finally, the microleakage was measured after dye penetration.
For data analysis, Non parametric Kruskal-Wallis and Mann-Whithney tests were used (µ=0.05).
Result:

The mean rank of microleakage in buccal margin was more than lingual one (P<0.05).
In all of  the finishing margins, zinc phosphate cement showed the highest microleakage in buccal and lingual walls (P<0.05).
In all of  the finishing margins, Panavia F showed the least microleakage compared to the other cements in two walls (P<0.05).

Conclusion:
For promotion of marginal seal in base metal – porcelain crowns, the use of Panavia F as a luting cement is suggested.

Keywords

Journal of Mashhad Dental School
Volume 29, Issue 1,2
Spring & Summer 2005
April 2005
Pages 75-80

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History

  • Receive Date: 12 September 2013
  • Accept Date: 12 September 2013

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