Abstract
Purpose: This study evaluated the influence of surface treatments on the microtensile bond strength between a glass fiber post surface and resin cements. Methods: Forth-five posts (Reforpost, Angelus, Londrina, PR- Brazil) were assigned to three groups with different surface treatment: Group 1: No treatment and silane application only (G1); Group 2: immersion in 96% ethyl alcohol for 10 minutes followed by silane application (G2); Group 3: immersion in 24% H2O2 for 10 minutes followed by silane application (G3). Each group was divided into 3 subgroups according to the resin cement used: UniCem/3MESPE (UN); BisCem/Bisco (BC); and Panavia F/Kuraray (PN). Posts were placed in a square-shaped matrix, in which it was held in place by the resin cement and subsequently photo-cured. Blocks were obtained, serially cut into sticks and then loaded onto a micro-tensile testing machine. Results: ANOVA indicated significant differences among surface treatments (p 0.05). Group G1 had lower bond strength values (p<0.05). The values for group BC and group PN were significantly higher than group UN (p<0.05). The type of surface treatment and resin cement influenced the microtensile bond strength. Hypothesis: The use of different surface treatment can improve the chemical-mechanical interaction between fiber posts and resin cements, thus improving the performance of clinical application of these materials in endodontic treated teeth. Clinical Significance: Within the parameters of this study, the bonding capability of conventional and self-adhesive resin cements to fiber posts were affected by different post surface pre-treatments. Post surfaces treated with 24% H 2 O 2 or 96% ethyl alcohol showed significantly stronger bond interactions to resin cements than only silane application.
Highlights
The use of restorative fiber posts for the restoration of endodontically treated teeth is currently a common practice in dental offices due to good mechanical properties of the fiber posts when compared to traditional metal cast posts [1,2,3]
Hypothesis: The use of different surface treatment can improve the chemical-mechanical interaction between fiber posts and resin cements, improving the performance of clinical application of these materials in endodontic treated teeth
They are usually cemented inside the root canal with a conventional or a self-adhesive resin cement to increase their retention and improve the mechanical performance of restored teeth once the resin cement is able to dissipate the stress when tooth is in normal function [10,11,12]
Summary
The use of restorative fiber posts for the restoration of endodontically treated teeth is currently a common practice in dental offices due to good mechanical properties of the fiber posts when compared to traditional metal cast posts [1,2,3]. Glass fiber posts are basically composed of glass fibers, inorganic filler, and a resin matrix covering the whole thing. They are usually cemented inside the root canal with a conventional or a self-adhesive resin cement to increase their retention and improve the mechanical performance of restored teeth once the resin cement is able to dissipate the stress when tooth is in normal function [10,11,12]. Monticelli et al [13] have suggested the use of silane coupling agents in coating application on the post surface before using the resin cement in order to promote adhesion between the post surface and the polymeric
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