Monolithic crowns fracture analysis: The effect of material properties, cusp angle and crown thickness

Dental Materials : Official Publication of the Academy of Dental Materials
Mahdi ShahmoradiQing Li

Abstract

This study aimed to investigate the collective influence of material properties and design parameters on the fracture behavior of monolithic dental crowns. Three-dimensional (3D) models (N=90) with different combinations of design parameters (thickness, cusp angle and occlusal notch geometry) and material type (lithium disilicate, feldspar ceramic, zirconia, hybrid resin ceramic and hybrid polymer-infiltrated ceramic) were developed for the failure analysis using extended finite element method (XFEM) to identify the stress distribution, crack initiation load, fracture surface area and fracture pattern. Analytical formulation, in vitro fracture tests and fractographic analysis of dedicated models were also performed to validate the findings of the XFEM simulation. For all material types considered, crowns with a sharp occlusal notch design had a significantly lower fracture resistance against occlusal loading. In most of the models, greater crown thickness and cusp angle resulted in a higher crack initiation load. However, the effect of cusp angle was dominant when the angle was in the low range of 50° for which increasing thickness did not enhance the crack initiation load. Comparing the critical load of crack initiation for di...Continue Reading

Citations

Feb 26, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Carlo M SarattiSusanne S Scherrer
Jul 10, 2021·Clinical and Experimental Dental Research·Alexandre Luiz Souto BorgesMutlu Özcan
Dec 6, 2021·International Journal for Numerical Methods in Biomedical Engineering·Xianhui FengChun'an Tang

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