Role of Chlorhexidine in Bond Strength to Artificially Eroded Dentin Over Time

Autor(es)

Francisconi-dos-Rios, Luciana Favaro ^[1] ; Caroll Casas-Apayco, Leslie ^[2] ; Calabria, Marcela Pagani ^[3] ; Silveria Francisconi, Paulo Afonso ^[4] ; Sanches Borges, Ana Flavia ^[4] ; Wang, Linda ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Operat Dent, Sch Dent, Sao Paulo, SP - Brazil

^[2] Peruvian Univ Appl Sci, Lima - Peru

^[3] Univ Sagrado Coracao, Dept Operat Dent, Sch Dent, Bauru, SP - Brazil

^[4] Univ Sao Paulo, Dept Operat Dent Endodont & Dent Mat, Bauru Sch Dent, Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Adhesive Dentistry; v. 17, n. 2, p. 133-139, 2015.
• Citações Web of Science: 12

Resumo

Purpose: To assess the long-term effect of a 2% aqueous chlorhexidine (CHX) solution on bond strength to artificially eroded dentin compared to sound dentin. Materials and Methods: Flat mid-coronal dentin surfaces of extracted third molars (n = 28) were subjected only to grinding with a 600-grit SiC paper for 1 min (sound dentin S, n = 14) or additionally to erosive pH cycling with a cola-based soft-drink (eroded dentin E, n = 14). After acid etching, rinsing, and air drying, S and E were rehydrated with 1.5 mu l of 2% CHX (S2%, n = 7; E2%, n = 7) or of distilled water (control SC, n = 7; EC, n = 7). Composite buildups were incrementally constructed with Filtek Z350 following Adper Single Bond 2 application. Specimens were sectioned into beams, which were subjected to microtensile testing immediately or after 6 or 12 months of aging. Fractured surfaces were observed under a digital microscope (50X magnification). Microtensile bond strength (mu TBS) (MPa) was analyzed by three-way ANOVA and Tukey's tests (a = 0.05) and failure mode by the Kruskal-Wallis test (a = 0.05). Results: Compared to sound dentin, eroded dentin was consistently related to lower mu TBS. Immediately and after 12-month aging, the effect of CHX was insignificant, but it was significant after 6-month aging, when it conserved the bond strength to both eroded and sound dentin. The percentage of adhesive and mixed failures were equivalent, and significantly more frequent than cohesive failures, whether in dentin or in composite. Conclusion: The 2% CHX effect on bond strength conservation to both eroded and sound dentin was not found to be persistent. (AU)

• Processo FAPESP: 09/14986-0 - Avaliação in vitro de diferentes concentrações de clorexidina na resistência a união à dentina normal e erodida
• Beneficiário: Linda Wang
• Modalidade de apoio: Auxílio à Pesquisa - Regular