Madiha Pirvani, Shoaib Khan, Sofia Malik.
Evaluation of Push out Bond Strength of a Dual-Cure Self-Adhesive Resin-Cement with Fiber Post Systems and Dentine.
J Pak Dent Assoc Jan ;24(1):28-34.

OBJECTIVE: The current concept of restoring endodontically treated teeth is based on the use of materials having elastic modulus similar to that of dentine (18.6 GPa). In this regard combination of fiber-reinforced posts and composite resin cements has shown promising results. The objective of the study was to evaluate the bond strength of the luting material with the dentine and the glass fiber post systems through push out test. The integration between these three materials was also observed through scanning electron microscopy. METHODOLOGY: The crowns of 40 extracted, non carious, single rooted human teeth were removed transversely at the cemento-enamel junction. After the standardized post space preparation two types of glass fiber posts (Everstick POST and RelyX(TM) Fiber Posts) were placed using two adhesive systems (RelyX(TM) Unicem and AquaCem), in four equal groups. Each root was cut horizontally into slices. Push-out bond strength test was conducted and the results were analyzed using kruskul wallis and tukey’s post hoc analysis with a p< 0.05 for statistical significance. RESULTS:The mean bond strengths of RelyX(TM) Fiber Posts cemented with AquaCem and RelyX(TM) Unicem were not statistically significant (p=0.696). Whereas the mean bond strength of Everstick glass fiber posts cemented with AquaCem or RelyX(TM) Unicem was lower than RelyX(TM) Fiber Posts cemented with either cement. This difference was statistically significant (p<0.05). CONCLUSION:The type of luting cements and posts significantly affected the bond strength. RelyX(TM) Unicem was more effective and demonstrated the highest bond strength values with both type of fiber post systems used in the study compared to AquaCem. AquaCem presented similar bond strength values as the RelyX(TM) Unicem with RelyX(TM) Fiber Post (p =0.696). KEY WORDS: Endodontic treatment, elastic modulus, dentine, composite resins, fiber posts, bond strength, cementoenamel junction, adhesives, push-out test.

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