Effectiveness of silica-lasing method on the bond strength of composite resin repair to Ni-Cr alloy.
J Prosthodont
; 24(3): 225-32, 2015 Apr.
Article
em En
| MEDLINE
| ID: mdl-25081813
ABSTRACT
PURPOSE:
The aim of this study was to evaluate the effectiveness of silica-lasing method for improving the composite resin repair of metal ceramic restorations. MATERIALS ANDMETHODS:
Sixty Ni-Cr cylindrical specimens were fabricated. The bonding surface of all specimens was airborne-particle abraded using 50 µm aluminum oxide particles. Specimens were divided into six groups that received the following surface treatments group 1-airborne-particle abrasion alone (AA); group 2-NdYAG laser irradiation (LA); group 3-silica coating (Si-CO); group 4-silica-lasing (metal surface was coated with slurry of opaque porcelain and irradiated by NdYAG laser) (Si-LA); group 5-silica-lasing plus etching with HF acid (Si-LA-HF); group 6-CoJet sand lased (CJ-LA). Composite resin was applied on metal surfaces. Specimens were thermocycled and tested in shear mode in a universal testing machine. The shear bond strength values were analyzed using ANOVA and Tukey's tests (α = 0.05). The mode of failure was determined, and two specimens in each group were examined by scanning electron microscopy and wavelength dispersive X-ray spectroscopy.RESULTS:
Si-CO showed significantly higher shear bond strength in comparison to other groups (p < 0.001). The shear bond strength values of the LA group were significantly higher than those of the AA group (p < 0.05). No significant difference was found among lased groups (LA, Si-LA, Si-LA-HF, CJ-LA; p > 0.05). The failure mode was 100% adhesive for AA, Si-LA, Si-LA-HF, and CJ-LA. LA and Si-CO groups showed 37.5% and 87.5% cohesive failure, respectively.CONCLUSION:
Silica coating of Ni-Cr alloy resulted in higher shear bond strength than those of other surface treatments.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ligas de Cromo
/
Reparação em Prótese Dentária
/
Dióxido de Silício
/
Resinas Compostas
/
Lasers de Estado Sólido
Idioma:
En
Revista:
J Prosthodont
Assunto da revista:
ODONTOLOGIA
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Irã