
doi: 10.4012/dmj.2016-298
pmid: 28190816
The objectives were to evaluate the fracture resistance and stress concentration in zirconia/composite veneered crowns in comparison to zirconia/porcelain crowns using occlusal fracture resistance and by stress analysis using finite element analysis method. Zirconia substructures were divided into two groups based on the veneering material. A static load was applied occlusally using a ball indenter and the load to fracture was recorded in Newtons (N). The same crown design was used to create 3D crown models and evaluated using FEA. The zirconia/composite crowns subjected to static occlusal load showed comparable results to the zirconia/porcelain crowns. Zirconia/composite crowns showed higher stress on the zirconia substructure at 63.6 and 50.9 MPa on the zirconia substructure veneered with porcelain. In conclusion, zirconia/composite crowns withstood high occlusal loads similar to zirconia/porcelain crowns with no significant difference. However, the zirconia/composite crowns showed higher stress values than the zirconia/porcelain crowns at the zirconia substructure.
Dental Stress Analysis, Dental Veneers, Crowns, Dental Prosthesis Design, Materials Testing, Humans, Dental Restoration Failure, Stress, Mechanical, Zirconium, Dental Porcelain
Dental Stress Analysis, Dental Veneers, Crowns, Dental Prosthesis Design, Materials Testing, Humans, Dental Restoration Failure, Stress, Mechanical, Zirconium, Dental Porcelain
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