title: Fracture resistance of zirconia-composite veneered crowns in comparison with zirconia-porcelain crowns.
abstract: 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.
authors.affiliation: Academic Unit of Restorative Dentistry, The School of Clinical Dentistry, The University of Sheffield.|Department of Dental Health, College of Applied Medical Sciences, King Saud University.
authors.forename: Omar
authors.initials: O
authors.lastname: Alsadon
authors.affiliation: Academic Unit of Restorative Dentistry, The School of Clinical Dentistry, The University of Sheffield.
authors.forename: David
authors.initials: D
authors.lastname: Patrick
authors.affiliation: Academic Unit of Restorative Dentistry, The School of Clinical Dentistry, The University of Sheffield.
authors.forename: Anthony
authors.initials: A
authors.lastname: Johnson
authors.affiliation: Academic Unit of Restorative Dentistry, The School of Clinical Dentistry, The University of Sheffield.
authors.forename: Sarah
authors.initials: S
authors.lastname: Pollington
authors.affiliation: Academic Unit of Restorative Dentistry, The School of Clinical Dentistry, The University of Sheffield.
authors.forename: Duncan
authors.initials: D
authors.lastname: Wood
mesh_terms: D003442:Crowns; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D003801:Dental Veneers; D006801:Humans; D008422:Materials Testing; D013314:Stress, Mechanical; D015040:Zirconium
chemical_list: D003776:Dental Porcelain; D015040:Zirconium
keywords: Bi-layered crowns; Composite veneer; Fracture resistance; Porcelain veneer; Zirconia