MECHANICAL BEHAVIOR OF CERAMIC VENEER IN ZIRCONIA-BASED RESTORATIONS: A 3-DIMENSIONAL FINITE ELEMENT ANALYSIS USING MICROCOMPUTED TOMOGRAPHY DATA

Autor(es)

Rocha, Eduardo Passos ^[1] ; Anchieta, Rodolfo Bruniera ^[1] ; Freitas Junior, Amilcar Chagas ^[1] ; de Almeida, Erika Oliveira ^[1] ; Cattaneo, Paolo M. ^[2] ; Ko, Ching Chang ^[3]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Fac Dent, Dept Dent Mat & Prosthodont, Aracatuba, SP - Brazil

^[2] Univ Aarhus, Dept Orthodont, DK-8000 Aarhus C - Denmark

^[3] Univ N Carolina, Dept Orthodont, Chapel Hill, NC - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PROSTHETIC DENTISTRY; v. 105, n. 1, p. 14-20, JAN 2011.
• Citações Web of Science: 30

Resumo

Statement of problem. The fracture or chipping of ceramic veneers is a common problem for zirconia-based restorations. Purpose. This study evaluated the stress distribution in the veneer of a maxillary central incisor restored with a complete crown using a zirconia core with a feldspathic ceramic veneer, simulating an incomplete bond between the veneer and zirconia substructure. Material and methods. Based on a microcomputed tomography of a maxillary central incisor, 3 finite element models (M) for a complete crown were developed: Mf, a complete crown based on feldspathic ceramic; Mlz, a zirconia-based complete crown with a complete bond at the zirconia/veneer interface; and Mnzl, similar to Mlz, but with an incomplete bond at the zirconia/veneer interface created by using a contact element with a frictional coefficient of 0.3. A distributed load of 1 N was applied to the lingual surface at 45 degrees to the long axis of the tooth. Results. The zirconia core in the Mnzl model showed peak stresses for maximum principal stress (sigma(max)) and shear stress of 9.02 and 8.81 MPa, respectively. The ceramic veneer in the Mnlz model showed peak stresses for sigma(max), minimum principal stress (compressive), and von Mises stresses of 5.4 MPa, 61.23 MPa, and 35.19 MPa, respectively. Conclusions. The incomplete bond increased the sigma(max) in the ceramic veneer in comparison to the perfect bond condition. (J Prosthet Dent 2010;105: 14-20) (AU)

• Processo FAPESP: 08/00209-9 - Comportamento biomecânico de uma prótese parcial removível classe I mandibular suportada distalmente por um implante osseointegrado: análise tridimensional de elementos finitos
• Beneficiário: Eduardo Passos Rocha
• Modalidade de apoio: Auxílio à Pesquisa - Regular