ABSTRACT
Restoration of the endodontically treated teeth is complicated by the fact that much or all of the coronal tooth structure has been destroyed by caries, previous restorations and the endodontic access preparation. Post-andcore has been most commonly used when insufficient dentin remains. Methods: Fourty translucent glass fiber post (Tenax fiber Trans Coltene Whaledent) of diameter 1.3 mm and 40 extracted premolars were used. Post were divided into 4 groups of 10 each depending on the pre –treatment of post surface.In Group 1: Multilink N primer A & B was applied on post surface and root dentin for 15 sec, (Control group), group 2 : Monobond S primer was applied for 60 sec, followed by multilink N primer A & B, Group 3: Immersion in 30% H2O2 for 5min, rinsing and application of Monobond S Primer (silane) and multilink N primer A & B and Group 4: application of 25% polyacrylic acid for 5 sec, rinsing, silane and multilink N primer A & B dual cure adhesive. The specimens were then sectioned horizontally into 1- mm-thick post-dentin sections. The post space (9mm) were divided into 3 halves: the coronal, middle and the apical third.The push out bond strength (MPa) were measured using a universal testing machine at a crosshead speed of 0.5mm/sec.Failure mode of each debonded specimen were analyzed using a stereomicroscope. Maximum failure mode were adhesive failure between post and resin cement. Results: The bond strength values were higher in group 3 and group 4 compared to group 2 and group 1. Conclusion: The pre-treatment of fiber post increases bond strength between fiber post and root dentin.