Pilot study of the relationship between the hardness and abrasion resistance of two base metal alloys used for metal-ceramic restorations.
J Prosthet Dent
; 85(2): 190-4, 2001 Feb.
Article
em En
| MEDLINE
| ID: mdl-11208210
STATEMENT OF PROBLEM: Base metal alloys present high values of strength and hardness, which have been associated with the greater abrasion resistance and polishing of metal-ceramic restorations. However, surface hardness has been shown to be a poor indicator of abrasion resistance. PURPOSE: The study aimed to compare the hardness and abrasion resistance of Ni-Cr alloys and determine whether there is a correlation between these 2 properties. MATERIAL AND METHODS: Two Ni-Cr alloys for metal-ceramic restorations with different hardness values were subjected to the following procedures: (1) initial measurement of Vickers hardness, (2) a series of abrasion cycles, (3) measurement of mass loss after each cycle, and (4) Vickers hardness measurements after each cycle. RESULTS: For each alloy, linear regression revealed a negative correlation between hardness and reduction in mass. The higher hardness of alloy A was associated with higher mass loss during abrasion when compared with alloy B. CONCLUSION: There was no significant correlation between hardness and mass loss for either alloy.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ligas de Cromo
/
Ligas Metalo-Cerâmicas
/
Ligas Dentárias
Limite:
Humans
Idioma:
En
Revista:
J Prosthet Dent
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Estados Unidos