Effect of etching time and light source on the bond strength of metallic brackets to ceramic

Brazilian Dental Journal

Paulo Roberto Amaral Gonçalves²  Rafael Ratto De Moraes¹  Ana Rosa Costa¹  Américo Bortolazzo Correr¹  Paulo Roberto Aranha Nouer²  Mário Alexandre Coelho Sinhoreti¹  Lourenço Correr-sobrinho¹ 

[1] ,São Leopoldo Mandic Research Center Dental School Department of OrthodonticsCampinas SP ,Brazil

关键词: bonding;    ceramic;    etching time;    light source;    shear bond strength;   

DOI  :  10.1590/S0103-64402011000300011

来源: SciELO

【 摘 要 】

This study evaluated the bond strength of brackets to ceramic testing different etching times and light sources for photo-activation of the bonding agent. Cylinders of feldspathic ceramic were etched with 10% hydrofluoric acid for 20 or 60 s. After application of silane on the ceramic surface, metallic brackets were bonded to the cylinders using Transbond XT (3M Unitek). The specimens for each etching time were assigned to 4 groups (n=15), according to the light source: XL2500 halogen light, UltraLume 5 LED, AccuCure 3000 argon laser, and Apollo 95E plasma arc. Light-activation was carried out with total exposure times of 40, 40, 20 and 12 s, respectively. Shear strength testing was carried out after 24 h. The adhesive remnant index (ARI) was evaluated under magnification. Data were subjected to two-way ANOVA and Tukey's test (α=0.05). Specimens etched for 20 s presented significantly lower bond strength (p<0.05) compared with those etched for 60 s. No significant differences (p>0.05) were detected among the light sources. The ARI showed a predominance of scores 0 in all groups, with an increase in scores 1, 2 and 3 for the 60 s time. In conclusion, only the etching time had significant influence on the bond strength of brackets to ceramic.

【 授权许可】

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