Efeito de agentes clareadores de uso interno na resistência de união de pinos de fibra de vidro à dentina radicular

• Ano de defesa: 2012
• Autor(a) principal: Ferreira, Josemar Martins
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; BR; Programa de Pós-graduação em Odontologia; Ciências da Saúde; UFU
• Palavras-chave em Português: Materiais dentários; Pinos dentários; Clareadores; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: https://repositorio.ufu.br/handle/123456789/16944; https://doi.org/10.14393/ufu.di.2012.178

The aim of this study was to evaluate the effect of internal bleaching agents on fibreglass post bond strength to root dentine, seventy bovine teeth were divided into 7 experimental groups (n=10) varying the bleaching agent used: SpH- sodium perborate + 20%hydrogen peroxide; SpW- sodium perborate + distilled water; Cp37- 37%carbamide peroxide; Cp16- 16%carbamide peroxide; Cp10- 10%carbamide peroxide; H- 35%hydrogen peroxide; C- no bleaching agent (control). After bleaching protocols, posts were cemented with self-adhesive resin cement (RelyX U100) and roots were cross-sectioned to obtain two discs for each third. Posts were submitted to micropush-out test and bond strength values (MPa) were submitted to ANOVA in a split-plot arrangement and Tukey s test (p<0.05). Failure mode was evaluated under a confocal microscope. There was no significant difference between the control and groups with a bleaching agent. 16%carbamide peroxide (Cp16) resulted in higher bond strength value than sodium perborate + 20%hydrogen peroxide (SpH) on cervical third. The cervical third presented higher bond strength value compared to the apical third in the 10%carbamide peroxide (Cp10), 16%carbamide peroxide (Cp16) and sodium perborate + distilled water (SpW) and no significant difference in the other groups. The prevalence of adhesive cement-dentine failure was verified in all groups. The use of internal bleaching agents did not decrease fibreglass post bond strength to root dentin.