Fracture Resistance Of Endodontically Treated Teeth Restored With Different Post Systems A Comparative Study

Statement of Problem: many post system are available to clinicians, yet no consensus exists regarding the superiority of any one in restoring endodontically treated teeth. Purpose: The aim of his in vitro study was to -Determining the fracture resistance of endodontically treated teeth restored with three different post systems. Comparison of fracture resistance of endodontically treated teeth restored with three different post systems. Material and methods: Thirty maxillary central incisors were randomly divided into three groups. (n=10). All teeth received endodontic treatment. First group restored with glass fibre post and composite core system. Second group restored with prefabricated Ti alloy post and composite core system. Third group restored with cast post and core system. All the post system was cemented with adhesive resin cement. Compressive load was applied at an angle of 130 to the long axis of teeth at a cross head speed of 1 mm/min until fracture occurred. One way ANOVAs were used to determine the difference of the failure loads between the groups. Results: The mean value for fracture resistance was (233.24±26.20) N, (249.00±31.55)N, (330.39±30.81)N in group I Glass fibre reinforced composite post and core, group II Titanium alloy post and composite core, group III custom cast Ni-Cr post and core) respectively. Analysis of Variance (one way ANOVA) of fracture resistance results shows the significant difference amongst the three groups P<0.01. The custom cast Ni-Cr post and core specimens presented the higher mean values of fracture resistance as compared to group I and group II. Conclusion: This study showed that the fracture resistance of cast post-and-core was Significantly higher than glass fibre post and composite core system and prefabricated Ti alloy Post and composite core system.