Acid Etching and Surface Coating of Glass-Fiber Posts: Bond Strength and Interface Analysis

Brazilian Dental Journal - Tập 27 Số 2 - Trang 228-233 - 2016
Doglas Cecchin1, Ana Paula Farina1, Rafael Pino Vitti2, Rafael R. Moraes3, Ataís Bacchi4, Aloísio Oro Spazzin4
1Department of Restorative Dentistry, Dental School, UPF - Universidade de Passo Fundo, Passo Fundo, RS, Brazil
2Department of Prosthodontics, Dental School, UNITAU - Universidade de Taubate, Taubate, SP, Brazil
3Department of Restorative Dentistry, Dental School, UFPel - Universidade Federal de Pelotas, Pelotas, RS, Brazil
4Department of Prosthodontics, Dental School, IMED - Faculdade Meridional, Passo Fundo, RS, Brazil

Tóm tắt

Abstract The aim of this study was to evaluate the bond strength of a composite resin to glass-fiber post (GFP) treated or not with phosphoric acid, silane coupling agent, and unfilled resin. GFPs were etched or not with 37% phosphoric acid and different surface coating applied: silane coupling agent, unfilled resin, or both. Composite resin blocks were built around a 4-mm height on the GFP. Unfilled resin (20 s) and composite resin (40 s) were light activated by a light-emitting diode unit. The specimens were stored in distilled water at 37 °C for 24 h. Microtensile bond test was performed using a mechanical testing machine until failure (n=10). The data were analyzed using two-way ANOVA followed by Student-Newman-Keuls' test (p<0.05). Failure modes were classified as adhesive, mixed, or cohesive failures. Additional specimens (n=3) were made to analyze the bonded interfaces by scanning electron microscopy. The statistical analysis showed the factor 'surface coating' was significant (p<0.05), whereas the factor 'HP etching' (p=0.131) and interaction between the factors (p=0.171) were not significant. The highest bond strength was found for the silane and unfilled resin group (p<0.05). A predominance of adhesive and cohesive failures was found. Differences regarding the homogeneity and thickness of the unfilled resin layer formed by different GFP surface treatments were observed. The application of silane and unfilled resin can improve the bond strength between GFP and resin composite.

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Thông tin xuất bản

Brazilian Dental Journal

Tập 27 Số 2

228-233

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