Tensile dislodgment evaluation of two experimental prefabricated post systems.
This study tested the tensile dislodgment forces of two experimental post 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 ParaPost (SP). The XT-7 prototype post measured 7 mm in length, while all other post systems were 10 mm. The XT-7 and the FP are active post systems that are threaded throughout their entire length. The SP is a passive serrated post system, and the XT-10 is a combination active/passive design that has a 7 mm coronal thread with a passive serrated apical end. All systems tested were titanium alloy except the SP system, which 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. This study clearly demonstrated highest retention for the active post system, least retention for the passive post, with an intermediate retentiveness for the combined design.
Lepe
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University of Washington, School of Dentistry, Department of Restorative Dentistry, Seattle 98195-7456, USA.
Bales
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DJ
Johnson
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D000704:Analysis of Variance; D001840:Dental Bonding; D017005:Dental Debonding; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention / Q000295:instrumentation; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique / Q000295:instrumentation*; D013193:Stainless Steel; D013718:Tensile Strength; D014025:Titanium; D015036:Zinc Phosphate Cement
D013193:Stainless Steel; D015036:Zinc Phosphate Cement; D014025:Titanium