TENSILE DISLODGMENT EVALUATION OF 2 EXPERIMENTAL PREFABRICATED POST SYSTEMS

This study tested the tensile dislodgment forces of two experimental p ost designs that are threaded 7 mm into the most coronal aspect of the root. Experimental post systems ParaPost XT-7 (XT-7), and ParaPost XT -10 (XT-10) were compared to the Flexi-Post (FP) and to the Standard P araPost(SP). The XT-7 prototype post measured 7 mm in length, while al l other post systems were 10 mm. The XT-7 and the FP are active post s ystems that are threaded throughout their entire length. The SP is a p assive serrated post system, and the XT-10 is a combination active/pas sive design that has a 7 mm coronal thread with a passive serrated api cal end,All systems tested were titanium alloy except the SP system, w hich was stainless steel. The purpose of this study was to compare an active and a passive post design to the experimental designs of the XT -7 active post and the combined active/passive design of the XT-10, Th is study clearly demonstrated highest retention for the active post sy stem, least retention for the passive post, with an intermediate reten tiveness for the combined design.