Effect of margin design changes on stress distribution in zirconia-based full-crown restorations: A three-dimensional finite element analysis
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Finite element analysis, zirconia, stress distribution, porcelain
Abstract
Aim: The aim of this study was to evaluate the effect of margin design changes on the stress distribution in zirconia-based full-crown restorations using three-dimensional finite element analysis.
Methodology: For use in the design of full-crown restorations, tooth number 16 was prepared in chamfer step type on a maxillary tooth jaw model (AG-3: Tipodont, Frasaco, Germany). The prepared tooth was scanned using a desktop scanner, and a three-dimensional finite element analysis model was obtained. Zirconia frameworks are divided into three groups according to the margin design: uniform thickness hood type (Model A), ¾ partial crown form (Model B), and a lingual-band type (Model C). The crown form was completed using feldspathic porcelain as the superstructure material. To determine the stress distribution of the margin design on the restoration, the maximum principal stress (MPa) values under a 600 N vertical load were investigated.
Results: The maximum stress on the zirconia framework was observed in Model A (82.90 MPa), and the maximum stress on the tooth was observed in Model B (49.34 MPa). The maximum stress on the feldspathic porcelain was highest in Model A (21.860 MPa), and the minimum stress on the tooth occurred in Model B (13.33 MPa). In the zirconia framework, the lowest stress was 11.54 MPa (Model B).
Conclusion: The framework design was shown to affect the force generated on the restoration and transmitted to the tooth. The results of the present study will help dentists determine the ideal infrastructure design for zirconia-based restorations. Lingual band designs were found to be successful.
How to cite this article:
Güntekin N, Mohammadi R, Tunçdemir AR. Effect of margin design changes on stress distribution in zirconia-based full-crown restorations: A three-dimensional finite element analysis. Int Dent Res 2022;12(Suppl.1):10-5. https://doi.org/10.5577/intdentres.439
Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.
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