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Stress analysis of cantilever-fixed partial denture connector design using the finite element method.

Title
Stress analysis of cantilever-fixed partial denture connector design using the finite element method.
Type
Article in International Scientific Journal
Year
2009
Authors
Campos,J.Reis
(Author)
FMDUP
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Mário Augusto Pires Vaz
(Author)
Other
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Nuno Viriato Marques Ramos
(Author)
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Scientific classification
FOS: Medical and Health sciences > Health sciences
CORDIS: Technological sciences > Engineering > Mechanical engineering ; Health sciences > Medical sciences > Medicine > Stomatology
Other information
Resumo (PT): Objetivo: Analisar a distribuição de tensões em próteses parciais fixas em cantilever após aplicação de cargas simuladoras da mastigação, de forma a otimizar o seu desenho. Metodologia: Obteve-se a infra-estrutura de uma prótese parcial fixa em cantilever no sistema CAD-CAM Everest®Kavo v2.0, considerando dois materiais: titânio e zircônia, com conectores de 5,28 mm2 e 9,05 mm2, respectivamente. Gerou-se um modelo de elementos finitos, onde foram efetuadas análises de tensões com cargas simuladoras da mastigação. Resultados: Para zircônia, apenas o cantilever molar com área de conector mais reduzida, e concordância de 0,5 mm, excedeu o valor de resistência 575 MPa. Para o titânio, apenas o cantilever de 9,05mm2, com concordâncias de 1 e 1,4mm, apresentou valores inferiores à tensão do titânio. Conclusão: Dentro das limitações deste estudo pode-se concluir que as infra-estruturas de titânio em cantilever não suportam cargas mastigatórias máximas com uma área de conector de 5,28mm2 e requerem conectores de áreas superiores, com concordâncias introduzidas na embrasura gengival. A zircônia geralmente suporta forças mastigatórias máximas com cantilever molar ou pré-molar. Deve-se ter precaução quando a área dos conectores é reduzida para 5,28mm2. Palavras-chave: Prótese parcial fixa; cerâmica de policristais de zircônia tetragonal parcialmente estabilizada pelo ítrio; titânio; análise de tensões
Abstract (EN): Purpose: To analyze the stress distribution on a cantilever-fixed partial denture after simulation of maximum mastication loads in order to optimize its design. Methods: A cantilever-fixed partial denture framework was designed in the CAD-CAM system Everest®Kavo v2.0 using two materials, titanium and zirconium, with connectors of 5.28mm2 and 9.05 mm2, respectively. A finite element model was built for stress analysis using simulations of mastication load. Results: For zirconia, only the molar cantilever with the smaller connector area and a 0.5-mm fillet exceeded the considered threshold resistance value of 575 MPa. All the other designs yielded resistances below this value. For titanium, only cantilevers with 9.05mm2 connector area and fillets of 1 or 1.4 mm presented stress values inferior to titanium yield strengh. Conclusion: Within the limitations of this study, it can be concluded that titanium cantilever- fixed partial denture frameworks with a 5.28mm2 connector area cannot support maximum mastication loads; frameworks of this material require larger connectors with fillets introduced in the gingival embrasure. Zirconia, however, supports maximum bite forces in most situations with both molar and premolar design cantilevers. Precaution should be taken when dealing with smaller connectors of 5.28mm2. Key words: Fixed partial denture; Yttria-stabilized tetragonal zirconia polycrystals; ceramic; titanium; dental stress analysis
Language: English
Type (Professor's evaluation): Scientific
Contact: acorreia@fmd.up.pt
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