Surface roughness of orthodontic band cements with different compositions
J. appl. oral sci
; 19(3): 223-227, May-June 2011. graf, tab
Article
em En
| LILACS
| ID: lil-588126
Biblioteca responsável:
BR1.1
ABSTRACT
OBJECTIVES:
The present study evaluated comparatively the surface roughness of four orthodontic band cements after storage in various solutions. MATERIAL ANDMETHODS:
Eight standardized cylinders were made from 4 materials zinc phosphate cement (ZP), compomer (C), resin-modified glass ionomer cement (RMGIC) and resin cement (RC). Specimens were stored for 24 h in deionized water and immersed in saline (pH 7.0) or 0.1 M lactic acid solution (pH 4.0) for 15 days. Surface roughness readings were taken with a profilometer (Surfcorder SE1200) before and after the storage period. Data were analyzed by two-way ANOVA and Tukey's test (comparison among cements and storage solutions) or paired t-test (comparison before and after the storage period) at 5 percent significance level.RESULTS:
The values for average surface roughness were statistically different (p<0.001) among cements at both baseline and after storage. The roughness values of cements in a decreasing order were ZP>RMGIC>C>R (p<0.001). After 15 days, immersion in lactic acid solution resulted in the highest surface roughness for all cements (p<0.05), except for the RC group (p>0.05). Compared to the current threshold (0.2 µm) related to biofilm accumulation, both RC and C remained below the threshold, even after acidic challenge by immersion in lactic acid solution.CONCLUSIONS:
Storage time and immersion in lactic acid solution increased the surface roughness of the majority of the tested cements. RC presented the smoothest surface and it was not influenced by storage conditions.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Cimentos Dentários
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article