The effect of core:dentin thickness ratio on the bi-axial flexure strength and fracture mode and origin of bilayered dental ceramic composites.
Dent Mater
; 21(2): 164-71, 2005 Feb.
Article
em En
| MEDLINE
| ID: mdl-15681015
ABSTRACT
OBJECTIVES:
The aim of the current study was to assess the effect of coredentin thickness ratio on the flexure strength, fracture mode and origin of bilayered dental ceramic composite disc specimens.METHODS:
Sets of 30 bilayered composite discs with coredentin thickness ratio of 21, 11 and 12 were tested in bi-axial flexure with both the reinforcing core and veneering dentin loaded in tension. Mean flexure strengths, standard deviations and associated Weibull Moduli (m) were determined. A combination of optical and scanning electron microscopy was employed for identification of the fracture mode and origin.RESULTS:
The coredentin ratio influenced the bi-axial flexure strength and reliability of the flexure strength data when both the reinforcing core and veneering dentin porcelain were tested in tension. The strength and reliability was increased for a coredentin thickness of 21. The number of fracture fragments, the frequency of occurrence of specimen delaminations, Hertzian cone formations and sub-critical radial cracking in the bilayered dental ceramic composite disc shaped specimens was also dependent on the core/dentin ratio and the surface loaded in tension.CONCLUSIONS:
Coredentin thickness ratio influences the bi-axial flexure strength and fracture mode and origin in bilayered dental ceramic composite specimens.
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Base de dados:
MEDLINE
Assunto principal:
Cerâmica
/
Porcelana Dentária
Limite:
Humans
Idioma:
En
Revista:
Dent Mater
Assunto da revista:
ODONTOLOGIA
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Reino Unido