Effect of surface treatments on repair strength, roughness and morphology in aged metal-free crowns
Braz. j. oral sci
; 19: e206155, jan.-dez. 2020. ilus
Artigo
em Inglês
| BBO - Odontologia, LILACS
| ID: biblio-1116428
Biblioteca responsável:
BR218.1
ABSTRACT
Aim:
The roughness and micromorphology of various surface treatments in aged metal-free crowns and the bond strength of these crowns repaired with composite resin (CR) was evaluated in vitro.Methods:
A CR core build-up was confectioned in 60 premolars and prepared for metal-free crowns. Prepared teeth were molded with the addition of silicone, and the laboratory ceromer/fiber-reinforced crowns (SR Adoro/Fibrex Lab) were fabricated. Subsequently, the crowns were cemented and artificially aged in a mechanical fatigue device (1.2 X 106 cycles), then divided into 4 groups (n = 15) according to the surface treatment 1) phosphoric acid etching (PA); 2) PA + silane application; 3) roughening with a diamond bur + PA; and 4) sandblasting with Al2O3 + PA. After the treatments, the crowns (n = 2) were qualitatively analyzed by scanning electron microscope (SEM) and surface roughness (n = 5) was analyzed before and after the surface treatment (Ra parameter). The remaining crowns (n = 8) received standard repair with an adhesive system (Tetric N-Bond) and a nanohybrid CR (Tetric N-Ceram), and the microshear bond strength (SBS) test was performed (0.5 mm/min). Roughness and SBS data were analyzed by one- and two-way ANOVA, respectively, as well as Tukey's post-test (α = 0.05).Results:
Sandblasting with Al2O3 + PA resulted in the highest final roughness and SBS values. The lowest results were observed in the PA group, whereas the silane and diamond bur groups showed intermediate values.Conclusion:
It may be concluded that indirect ceromer crowns sandblasted with aluminum oxide prior to PA etching promote increased roughness surface and bond strength values
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Base de dados:
BBO - Odontologia
/
LILACS
Assunto principal:
Propriedades de Superfície
/
Cerâmica
/
Resinas Compostas
/
Resistência ao Cisalhamento
/
Tomografia com Microscopia Eletrônica
Idioma:
Inglês
Revista:
Braz. j. oral sci
Assunto da revista:
Odontologia
Ano de publicação:
2020
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
State University of Ponta Grossa/BR