title: Zirconia-based dental crown to support a removable partial denture: a three-dimensional finite element analysis using contact elements and micro-CT data.
abstract: Veneer fracture is the most common complication in zirconia-based restorations. The aim of this study was to evaluate the mechanical behavior of a zirconia-based crown in a lower canine tooth supporting removable partial denture (RPD) prosthesis, varying the bond quality of the veneer/coping interface. Microtomography (μCT) data of an extracted left lower canine were used to build the finite element model (M) varying the core material (gold core - MAu; zirconia core - MZi) and the quality of the veneer/core interface (complete bonded - MZi; incomplete bonded - MZi-NL). The incomplete bonding condition was only applied for zirconia coping by using contact elements (Target/Contact) with 0.3 frictional coefficients. Stress fields were obtained using Ansys Workbench 10.0. The loading condition (L = 1 N) was vertically applied at the base of the RPD prosthesis metallic support towards the dental apex. Maximum principal (σmax) and von Mises equivalent (σvM) stresses were obtained. The σmax (MPa) for the bonded condition was similar between gold and zirconia cores (MAu, 0.42; MZi, 0.40). The incomplete bonded condition (MZi-NL) raised σmax in the veneer up to 800% (3.23 MPa) in contrast to the bonded condition. The peak of σvM increased up to 270% in the MZi-NL. The incomplete bond condition increasing the stress in the veneer/zirconia interface.
authors.affiliation: a Department of Dental Materials and Prosthodontics , Araçatuba Dental School, UNESP - Sao Paulo State University , Araçatuba , Brazil.
authors.forename: Eduardo Passos
authors.initials: EP
authors.lastname: Rocha
authors.forename: Rodolfo Bruniera
authors.initials: RB
authors.lastname: Anchieta
authors.forename: Erika Oliveira
authors.initials: EO
authors.lastname: de Almeida
authors.forename: Amilcar Chagas
authors.initials: AC
authors.lastname: Freitas
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Martini
authors.forename: Bruno Sales
authors.initials: BS
authors.lastname: Sotto-Maior
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Luersen
authors.forename: Ching Chang
authors.initials: CC
authors.lastname: Ko
mesh_terms: D000818:Animals; D003442:Crowns; D003799:Dental Stress Analysis / Q000379:methods; D003832:Denture, Partial, Removable; D004285:Dogs; D020342:Finite Element Analysis; D006046:Gold / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D013314:Stress, Mechanical; D055114:X-Ray Microtomography; D015040:Zirconium / Q000494:pharmacology*
chemical_list: D006046:Gold; D015040:Zirconium; C028541:zirconium oxide
keywords: finite element analysis; fixed partial denture; removable partial denture; zirconium oxide