The effect of etching time duration on the push out strength of self adhesive cement to root dentin
Keywords:
self adhesive resin, fiber post, pre-etchingAbstract
Introduction: Post debonding is one of the most important causes of restoration failure in endodontically treated teeth restored with fiber-post. The weakest connection in post-cement-dentin complex is cement-dentin bonding surface. In this study we evaluated the effect of etching with phosphoric-acid and its duration on push-out strength of self-adhesive resin cement to dentin. Materials and Method: Root canal therapy was done for fifty intact one-canal premolars then the crown was cut from CEJ. Fiber-post space was prepared in the root canal by FGM special drill. The teeth were randomly divided into five groups of ten teeth. Group without any intervention was considered as control-1 and the other groups were prepared for etching. Three groups were etched with 37%phosphoric-acid for 15seconds, 60seconds and 90seconds. In the last group, after preparation, etching protocol wasn't performed which was considered as control-2. In all samples, White post fiber-ost(FGM) size2 was cemented with self-adhesive cement TheraCem (Bisco) and divided into two 4mm pieces and then mounted in acryl. Push-out test was performed by Instron machine for each sample and the shear bond strength was obtained in MPa.
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