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Cyclic fatigue of Vita mark II machinable ceramics under Hertzian's contact / 华西口腔医学杂志
West China Journal of Stomatology ; (6): 306-308, 2006.
Artigo em Chinês | WPRIM | ID: wpr-288943
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the cyclic fatigue modes of Vita mark II machinable ceramics under Hertzian's contact.</p><p><b>METHODS</b>Hertzian's contact technique (WC spheres r = 3.18 mm) was used to investigate the cyclic fatigue of Vita mark II machinable ceramic. All specimens were fatigued by cyclic loading in moist environment, furthermore, surviving strength was examined by three point test and morphology damage observation.</p><p><b>RESULTS</b>In homogeneous Vita mark II machinable ceramics, two fatigue damage modes existed after cyclic loading with spheres under moist environment, including conventional tensile-driven cone cracking (brittle mode) and shear-driven microdamage accumulation (quasi-plastic mode). The latter generated radial cracks and deeply penetrating secondary cone crack. Initial strength degradation were caused by the cone cracks, subsequent and much more deleterious loss was caused by radial cracks.</p><p><b>CONCLUSION</b>Cyclic fatigue modes of Vita mark II machinable ceramics includes brittle and quasi-plastic mode.</p>
Assuntos
Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Propriedades de Superfície / Teste de Materiais / Cerâmica / Porcelana Dentária Limite: Humanos Idioma: Chinês Revista: West China Journal of Stomatology Ano de publicação: 2006 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Propriedades de Superfície / Teste de Materiais / Cerâmica / Porcelana Dentária Limite: Humanos Idioma: Chinês Revista: West China Journal of Stomatology Ano de publicação: 2006 Tipo de documento: Artigo