Effectiveness of self-adhesive luting cements in bonding to chlorhexidine-treated dentin

Autor(es)

Di Hipolito, Vinicius ^[1] ; Rodrigues, Flavia Pires ^[1] ; Piveta, Fabiana Barbara ^[1] ; Azevedo, Lidia da Cunha ^[1] ; Bruschi Alonso, Roberta Caroline ^[1] ; Silikas, Nick ^[2] ; Carvalho, Ricardo Marins ^[3] ; De Goes, Mario Fernando ^[4] ; Perlatti D'Alpino, Paulo Henrique ^[1]

Afiliação do(s) autor(es)

^[1] Anhanguera Bandeirante Univ Sao Paulo, UNIBAN, Sch Dent, Biomat Res Grp, BR-02071013 Sao Paulo - Brazil

^[2] Univ Manchester, Sch Dent, Biomat Sci Res Grp, Manchester M13 9PL, Lancs - England

^[3] Univ British Columbia, Fac Dent, Div Biomat, Vancouver, BC V5Z 1M9 - Canada

^[4] Univ Estadual Campinas, UNICAMP, Sch Dent, Dent Mat Dept, Campinas - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 28, n. 5, p. 495-501, MAY 2012.
• Citações Web of Science: 34

Resumo

Objectives. The aim was to investigate the microtensile bond strength (mu-TBS) and failure pattern of self-adhesive luting cements (SLC) to dentin pre-treated with different concentrations of chlorhexidine (CHX) solutions. Methods. The occlusal enamel was removed from 30 extracted sound human molars in order to expose a flat dentin. Resin-composite (Filtek Z250, 3 M ESPE) discs (12 mm in diameter, 6.0 mm thickness) were cemented to the smear layer-covered dentin using the SLC {[}RelyX U100, 3 M ESPE (U100); Multilink Sprint, Ivoclar Vivadent (MS)] with 0.2% or 2.0% CHX solutions. Results were compared with the control, untreated dentin. Six groups were then created based on the SLC and dentin pre-treatment (n = 5). After 24 h of water storage, restored teeth were serially sectioned into beams with a cross-sectional area of 0.8 mm(2) at the bonded interface. Subsequently, specimens were tested in tension with a crosshead speed of 0.5 mm/min in a universal testing machine, and the failure patterns were classified. Two-way ANOVA and Tukey's tests were performed (alpha = 0.05). Additionally, 18 teeth were subjected to energy-dispersive X-ray spectroscopy (EDS) analysis and micromorphology characterization of the smear layer-covered dentin and 0.2% or 2.0% CHX-treated dentin surfaces. Results. The mu-TBS obtained for both control groups were significantly higher, regardless of the CHX concentration and/or the cement used. Bond strengths were significantly higher for U100 than for MS, except when 2.0% CHX was applied. Fractographic analysis indicated that most failures in the control groups occurred cohesively in the SLC. Pre-treated dentin with 0.2% and 2.0% CHX solutions presented higher incidences of adhesive failures. EDS/SEM analysis exhibited varied concentrations of chlorine ions and crystal-shaped precipitates, depending upon the CHX concentration. Significance. Pre-treatment of dentin with 0.2% or 2.0% CHX adversely affects the bonding efficacy when associated with the SLCs tested. (C) 2011 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/12538-7 - Annual Meeting of the Academy of Dental Materials
• Beneficiário: Vinicius Di Hipolito
• Modalidade de apoio: Auxílio à Pesquisa - Reunião - Exterior