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Title: Effect of etching time and light source on the bond strength of metallic brackets to ceramic
Authors: Gonçalves, Paulo Roberto Amaral
Moraes, Rafael Ratto de
Costa, Ana Rosa
Correr, Américo Bortolazzo
Nouer, Paulo Roberto Aranha
Sinhoreti, Mário Alexandre Coelho
Correr Sobrinho, Lourenço
Abstract: 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 eldspathic 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 12s 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.
Keywords: Bonding
Etching time
Light source
Shear bond strength
Publisher: Dental Foundation of Ribeirão Preto
Citation: GONÇALVES, Paulo Roberto Amaral; MORAES, Rafael Ratto de; COSTA, Ana Rosa; CORRER, Américo Bortolazzo; NOUER, Paulo Roberto Aranha; SINHORETI, Mário Alexandre Coelho; CORRER-SOBRINHO, Lourenço. Effect of etching time and light source on the bond strength of metallic brackets to ceramic. Brazilian Dental Journal (Impresso), v. 22, p. 245-248, 2011.
Issue Date: 2011
Appears in Collections:Departamento de Odontologia Restauradora: Artigos de periódicos

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