Evaluation of bond strength of various margin ceramics to a zirconia ceramic.
J Dent
; 36(10): 822-7, 2008 Oct.
Article
em En
| MEDLINE
| ID: mdl-18620791
ABSTRACT
OBJECTIVE:
This study evaluated the bond strengths of four different margin ceramics based on fluoroapatite and feldspath to a zirconia ceramic.METHODS:
Zirconia cores (Zirconzahn) (N=28, n=7/margin ceramic group) were fabricated according to the manufacturers' instructions (diameter 4mm; thickness 2mm) and ultrasonically cleaned. Four different margin ceramics (thickness 5mm) (Cerabien Zr, Noritake; Ceramco PFZ, Ceramco; e.max, Ivoclar Vivadent and Triceram, Dentaurum) were vibrated and condensed in a stainless steel mould and fired onto their zirconia cores. After trying the specimens in the mould for minor adjustments, they were again ultrasonically cleaned and embedded in PMMA. The specimens were stored in distilled water at 37 degrees C for 1 week and shear bond strength (MPa+/-S.D.) tests were performed in a universal testing machine (crosshead speed 0.5mm/min). Failure modes were recorded under SEM.RESULTS:
Significant effect of margin ceramic types were found on the bond strength values (P<0.05). The mean bond strength values of Ceramco margin ceramic to zirconia was significantly lower (25.4+/-4.5 MPa) (P<0.05) than those of Cerabien (31.6+/-6.4 MPa), e.max (35.9+/-8.4 MPa), and Triceram margin ceramic (38.8+/-7.1 MPa) systems.CONCLUSIONS:
Margin ceramics, compatible with zirconia framework material tested in the present study, exhibited high bond strength values. Variations in thermal expansion coefficients might influence their bond strength values.
Texto completo:
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Desenho de Prótese
/
Zircônio
/
Colagem Dentária
/
Ligas Metalo-Cerâmicas
/
Porcelana Dentária
Tipo de estudo:
Evaluation_studies
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article