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Orthod Craniofac Res ; 18(2): 117-24, 2015 May.
Artigo em Inglês | MEDLINE | ID: mdl-25600658

RESUMO

OBJECTIVES: To evaluate the effects of intracoronary bleaching on the bond strength of orthodontic brackets using self-etching and total-etch adhesive systems. MATERIAL AND METHODS: In 60 bovine incisors, a coronal lingual access was made to clean the pulp chamber and standardise the thickness of the dentine. The sample was randomly divided into four groups (each n = 15): (CT), control group, without bleaching and bonded with the total-etch system (Transbond(™) XT-3M); (CTSE), without bleaching treatment and bonded with the self-etching system (Transbond(™) Plus Self-Etching Primer-3M); (BT), treated with 35% hydrogen peroxide for internal bleaching and bonded with the total-etch adhesive system; and (BTSE), treated with 35% hydrogen peroxide and bonded with the self-etching adhesive system. Shear bond strength was measured using a universal testing machine (EMIC). The adhesive remnant index (ARI) score was verified. The data were analysed using a two-way anova and Tukey test (p < 0.05). RESULTS: Significant differences were found, and the self-etching adhesive groups presented the highest bond strength values (CTSE=11.55 ± 2.85 MPa; BTSE=14.14 ± 2.23 MPa). The ARI scores revealed significant differences among the groups; the greater amount of remaining adhesive was observed in the CTSE group, and the lowest scores were observed in the BT group. CONCLUSIONS: The use of the self-etching adhesive system, even after intracoronal bleaching, presented satisfactory adhesive strength for the bonding of brackets.


Assuntos
Colagem Dentária , Dentina/ultraestrutura , Braquetes Ortodônticos , Cimentos de Resina/química , Clareamento Dental/métodos , Adesividade , Animais , Bovinos , Lâmpadas de Polimerização Dentária/classificação , Cavidade Pulpar/efeitos dos fármacos , Análise do Estresse Dentário/instrumentação , Peróxido de Hidrogênio/química , Peróxido de Hidrogênio/farmacologia , Teste de Materiais , Distribuição Aleatória , Preparo de Canal Radicular/métodos , Saliva Artificial/química , Resistência ao Cisalhamento , Estresse Mecânico , Propriedades de Superfície , Temperatura , Fatores de Tempo , Clareadores Dentários/química , Clareadores Dentários/farmacologia
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