The effect of carbamide peroxide bleaching agents on the microhardness of dental ceramics.
Acta Odontol Latinoam
; 23(2): 79-83, 2010.
Article
en En
| MEDLINE
| ID: mdl-21053678
This study examined the effect of 10% and 16% carbamide peroxide bleaching agents on the surface microhardness of micro-particulate feldspathic ceramics (VM7 and VM13, Vita Zahnfabrik). Forty specimens (8-mm diameter, 2-mm thickness) were divided into four groups (n=10): GI-VM7 + 10% Whiteness, G2-VM7 + 16% Whiteness, G3-VM13 + 10% and G4-VM13 + 16% Whiteness. The home-use bleaching agents were applied for 8 hours on 15 days, and the specimens were stored in distilled water at 37 degrees C. The Vickers hardness number (HV) was determined for each specimen. Data were analyzed by the Wilcoxon and Mann-Whitney tests (p < 0.05). The microhardness values before exposure were: g1-433 (57); g2-486 (22); g3-509 (28); g4-518 (24), and after exposure: G1-349 (32); G2-496 (95); G3-519 (38); G4-502 (81). G2 exhibited a higher and significant difference than GI in VM7 groups, and the effect of bleaching concentration was shown to be significant by the Mann-Whitney test. And for VM13, both the Wilcoxon and Mann-Whitney tests showed no significant differences. When using 10% carbamide peroxide, the microhardness of VM7 ceramic was affected, and there were no effect on the microhardness between VM7 and VM13 ceramics when 16% carbamide peroxide was used.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Peróxidos
/
Urea
/
Cerámica
/
Materiales Dentales
/
Blanqueadores Dentales
/
Dureza
Idioma:
En
Revista:
Acta Odontol Latinoam
Asunto de la revista:
ODONTOLOGIA
Año:
2010
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Argentina