Adhesion to the bleached enamel surface: in vitro assessment through microtensile

Author(s)

Andréa Dias Neves Lago

• Document type: Master's Dissertation
• Press: São Paulo. , ilustrações.
• Institution: Universidade de São Paulo (USP). Faculdade de Odontologia (FO/SDO)
• Defense date: 2009-06-03

Examining board members

Narciso Garone Netto; Rodrigo de Castro Albuquerque; Maria Angela Pita Sobral

• Advisor: Narciso Garone Netto
• Field of knowledge: Health Sciences - Dentistry
• Indexed in: Banco de Dados Bibliográficos da USP-DEDALUS; Biblioteca Digital de Teses e Dissertações - USP
• Location: Universidade de São Paulo. Biblioteca da Faculdade de Odontologia; TD2; L177a

Abstract

Bleaching and adhesive proceedings are solutions much used in current Dentistry. Thus, this work aimed at assessing, in vitro, the adhesive resistance to bleached enamel through the microtensile mechanical trial. Two self-etch adhesive systems (Clearfil SE Bond - Kuraray and Adper Prompt L-Pop - 3M Espe) and a conventional adhesive (Adper Single Bond 2 - 3M Espe) were immediately employed, 7 and 14 days after bleaching with hydrogen peroxide at 35% (Whiteness HP - FGM) in the enamel. 60 bovine teeth were used, which had the enamel surface planned and following randomly divided into 12 groups (9 experimental and 3 controls) according to the employed adhesive and to the interval between the bleaching ending and the adhesive proceedings. The microtensile trial was accomplished 24 hours after the confection of the tooth fillings and the fracture area was assessed through scanning electronic microscopy. There was significant reduction of the adhesive resistance in the filled teeth immediately after bleaching with all employed adhesives. After 7 and 14 days of the bleaching ending, the adhesive resistance values were equated and were similar to the values of the control groups and to the respective adhesive systems employed. The Adper Single Bond 2 adhesive presented the highest adhesive resistance values and the Adper Prompt L-Pop presented the lowest ones. There was predominance of adhesive and mixed factures in all groups. (AU)