Abstract
Aim: To evaluate the effect of push-out bond strength between different surface treated glass fiber posts and resin composite.
 Materials and Methods: Four Cylindrical Glass fiber post (GFP) of 1.3mm diameter were divided into four groups depending on the surface treatment of glass GFP. Group I– no surface treatment done for GFP, group II - silane coupling agent was applied to GFP, then coated with bonding agent, group III – GFP was etched with 37% phosphoric acid, then treated with silane coupling agent and later coated with bonding agent and group IV - GFP was etched with 5% hydrofluoric acid then treated with silane coupling agent and later coated with bonding agent. The surface treated posts were vertically stabilized in the centre of a matrix. Composite was filled circumferentially and incrementally and photo cured. It was then sectioned perpendicular to the vertical axis yielding ten 1.0mm thick discs per fiber post. Ten specimens per group were obtained. They were subjected to push-out bond strength using universal testing machine. One - way analysis of variance and Tukey’s test were performed to verify statistical differences between groups (P< 0.01).
 Results: Superior bond strength was seen in 5% hydrofluoric acid etched group. Etching with 37% phosphoric acid or silane coupling agent alone did not show significant difference. GFP without surface treatment showed least bond strength.
 Conclusion: Glass fiber posts should be etched with 5% hydrofluoric acid and treated with silane coupling agent before applying bonding agent for a better bond strength between composite and the GFP.
 Keywords: Glass fiber post, push-out bond strength, custom made glass fiber post.
Highlights
The clinical success of endodontically treated tooth depends frequently on post endodontic restoration
Group I– no surface treatment done for Glass fiber post (GFP), group II - silane coupling agent was applied to GFP, coated with bonding agent, group III – GFP was etched with 37% phosphoric acid, treated with silane coupling agent and later coated with bonding agent and group IV - GFP was etched with 5% hydrofluoric acid treated with silane coupling agent and later coated with bonding agent
Glass fiber posts should be etched with 5% hydrofluoric acid and treated with silane coupling agent before applying bonding agent for a better bond strength between composite and the GFP
Summary
The clinical success of endodontically treated tooth depends frequently on post endodontic restoration. Often endodontically treated teeth require use of intra-radicular post to support the coronal restoration and crown root fracture resistance. The post used must show physical properties similar to dentin in order to achieve long term clinical success.[1] Fiber posts have physical properties amenable to the properties of the dentin and are common choice.[2] Fiber posts are. Dr Vandana James et al, Journal of Biomedical and Pharmaceutical Research available as carbon fiber, quartz fiber, glass fiber and silicon fiber. Rathke et al and Balbosh et al have demonstrated the advantages of GFP over other posts.[3,4,5]
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