In Vitro Evaluation Of The Ferrule Effect And Post Material On Failure Load And Mode In Endodontically Treated Teeth

Abstract

Aim: To compare the ferrule effect and two types of bonded post material on failure load and mode of crowned endodontically treated teeth. Methods: Sixty eight extracted human maxillary central incisors were sectioned 15 mm coronal to the root apex using hard tissue cutter. They were then endodontically treated with master apical file size 45 and obturated with gutta percha and AH 26 sealer using lateral condensation technique. Samples were randomly divided into four groups of 17 where Group A was placed with titanium post without ferrule preparation; Group B placed with titanium post and 2 mm ferrule preparation; Group C placed with fiber white post without ferrule preparation and Group D placed with fiber white post and 2 mm ferrule preparation. Next, the core was built with Paracore and Ni-Cr crowns cemented before held in a metal base for the testing using universal testing machine. A compressive load at a crosshead speed of 1mm/ min at an angle of 135o to the long axis of the sample was applied until failure. Results: Kruskal-Wallis test indicated no significant difference in failure load between groups at α=0.05. Chisquare test for independence showed a significant difference in failure mode between the groups at α=0.05. Conclusion: Ferrule effect preparation and type of bonded post materials give no difference on failure load of endodontically treated teeth. Fiber reinforced composite posts have a more favourable failure mode when compared to metallic posts.