Effect of Bleaching Treatment and Reduced Application Time of an Antioxidant on Bond Strength to Bleached Enamel and Subjacent Dentin

Autor(es)

Lima, Adriano Fonseca ^[1] ; da Silva Fonseca, Fabricio Maurilio ; Freitas, Marcela Santiago ; Muniz Palialol, Alan Rodrigo ; Baggio Aguiar, Flavio Henrique ^[1] ; Marchi, Giselle Maria ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Piracicaba Sch Dent, Dept Restorat Dent, BR-13414903 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Adhesive Dentistry; v. 13, n. 6, p. 537-542, DEC 2011.
• Citações Web of Science: 9

Resumo

Purpose: To evaluate the influence of bleaching on bond strength to enamel and subjacent dentin, and to determine whether a reduced application time (1 min) of the antioxidizing agent can obviate the compromised bond strength after bleaching. Materials and Methods: One hundred twelve bovine incisors were obtained, and the enamel and dentin surfaces were standardized to a thickness of 1 mm. The specimens were divided into two control groups (enamel and dentin without treatment) and 12 experimental groups (n = 10), based on the concentration of bleaching agents (carbamide peroxide 16% and hydrogen peroxide 35%), time interval between bleaching and restorative procedures (24 h; 24 h + sodium ascorbate (SA) 10%/1 min; 14 days), and substrate (enamel or dentin). All samples were submitted to the bleaching treatment on enamel. After the stipulated interval, a microshear test was performed. Results: The bleaching treatment compromised the bond strength to the enamel when the restoration was performed 24 h after the end of bleaching. The bond strength to dentin was not affected by bleaching. Conclusions: The SA 10% application for 1 min obviates the detrimental effect of bleaching on bond strength. The bleaching performed on enamel does not affect the bond strength to the subjacent dentin. (AU)

• Processo FAPESP: 09/08992-7 - Efeito da aplicação direta e transamelodentinária do laser de baixa potência sobre células odontoblastóides expostas a agentes clareadores
• Beneficiário: Adriano Fonseca de Lima
• Modalidade de apoio: Bolsas no Brasil - Doutorado