Microshear bond strength of composite resin to bovine enamel previously bleached with carbamide peroxide gel, in different concentrations. / "Avaliação da força de adesão de resina composta sobre esmalte bovino previamente clareado com gel de peróxido de carbamida, em diferentes concentrações, por meio de teste de microcisalhameto"

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The aim of this in vitro study was to evaluate the microshear bond strength of adhesive systems to bovine enamel surfaces previously submitted, or not, to bleach treatment with carbamide peroxide gel (Opalescence PF), in different concentrations (10%, 15% and 20%). The flat enamel surfaces of 56 bovine incisors were randomly divided in 14 groups. G. 01: cylinders made with Single Bond adhesive system (SB) and Z-250 composite (C) (control); G. 02: cylinders made with Clearfil SE Bond (CF) adhesive system and Z-250 (C) (control); G. 03: bleaching treatment with Opalescence PF (Op) 10% and cylinders made with SB and C, 12 hours after finishing the bleach regimen; G. 04: bleaching treatment with Op 15% and cylinders made according to 03; G. 05: bleaching treatment with Op 20% and cylinders made according to 03; G. 06: bleaching treatment with Op 10% and cylinders made with CF and C, 12 hours after finishing the bleach regimen; G. 07: bleaching treatment with Op 15% and cylinders made according to 06; G. 08: bleaching treatment with Op 20% and cylinders made according to 06; G. 09: bleaching treatment with Op 10% and cylinders made with SB and C, 01 week after finishing the bleach regimen; G. 10: bleaching treatment with Op 15% and cylinders made according to 09; G. 11: bleaching treatment with Op 20% and cylinders made according to 09; G. 12: bleaching treatment with Op 10% and cylinders made with CF and C, 01 week after finishing the bleach regimen; G. 13: bleaching treatment with Op 15% and cylinders made according to 12; G. 14: bleaching treatment with Op 20% and cylinders made according to 12. The specimens from groups 03 to 14 were bleached during 02 weeks, 08 hours/day, placed in individualized trays. During the remaining daily 16 hours, teeth were immersed in artificial saliva. Before microshear tests, the samples were stored in distilled water at 37 o C, for 24 hours. The results showed that bond strengths of groups 03, 04, 05 and 06, 07, 08 were statistically lower (p<0,05) when compared with their respective control group (01 or 02). For the all-etch adhesive system, the bond strength of the cylinders placed 01 week after the end of bleaching regimen, independent of the carbamide peroxide gel concentration, showed no significant differences (p>0,05) when compared with their respective control group and tended to be higher when compared with groups where adhesion were made 12 hours after the end of the bleaching treatment, with the same adhesive system. However, in absolute terms, the recuperation of the bond strength were incomplete (p<0,05). For the self-etch adhesive system, the bond strength of the cylinders placed 01 week after the end of bleaching regimen, independent of the carbamide peroxide gel concentration, showed no significant differences (p>0,05) when compared with their respective control group, recovering the bond strength values obtained when cylinders were made 12 hours after the end of the bleach regimen.

ASSUNTO(S)

adhesive system sistema adesivo clareamento dental adhesion dental bleaching resina composta adesão composite resin

ACESSO AO ARTIGO

Documentos Relacionados