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

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.

Effect of thermally deposited siloxane‐methacrylate coating on bonding to glass fibre posts

“…, Cecchin et al . ). This procedure was performed to obtain a flat surface and allow the contact angle readings as well as the bond strength measurements.…”

“…A limitation of the methodology used in the present study is that the treatments were carried out over ground surfaces of GFPs, a procedure that has been carried out in other studies (Oliveira et al 2011, 2013, Gonc ßalves et al 2013, Cecchin et al 2016). This procedure was performed to obtain a flat surface and allow the contact angle readings as well as the bond strength measurements.…”

Influence of different surface treatments of fiberglass posts on the bond strength to dentin

“…When silane is used alone, it can form a non-homogeneous layer on the post surface. When used in combination with an adhesive layer, both materials can infiltrate the post surface and reinforce the bond with resin cement 34 . The use of heat-treated silane on the post surfaces is less common than its use to treat feldpsathic or glass ceramics before cementation.…”

Fratura Dental Com Tratamento Multidisciplinar

“…Nesse caso, optou-se pelo pino de fibra de vidro, o qual apresenta como vantagens: baixo stress, módulo de elasticidade semelhante ao da dentina, cor translú-cida, favorecendo a estética; fácil remoção com instrumentos rotatórios, custo menor do que outros sistemas, ausência de corrosão, compatibilidade com os sistemas adesivos e cimentos resinosos, formato que proporciona alta retentividade mecânica e menor desgaste da estrutura dentária próximo ao ápice CECCHIN et al, 2016).…”