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  • Title: A method of assessing the effectiveness of the friction fit interface by measuring reverse torque.
    Author: Rodrigues Neto DJ, Cerutti-Kopplin D, do Valle AL, Pereira JR.
    Journal: J Prosthet Dent; 2014 Oct; 112(4):839-42. PubMed ID: 24767898.
    Abstract:
    STATEMENT OF THE PROBLEM: The connection between abutments and implants is fundamental to successful prosthetic rehabilitation, and the loosening or fracture of the parts are undesirable outcomes. PURPOSE: The purpose of this study was to measure the reverse torque values of 2 different types of Morse taper implants. MATERIAL AND METHODS: Ten Morse taper implants were used, with their respective abutments. They were divided into 2 groups (n = 5): Group DH, implant interface with a double hexagon and Group OI, octagonal implant interface. Each abutment received 2 consecutive insertion torques (32 Ncm) at a 10-minute interval and 1 reverse torque after 5 minutes. The data were analyzed with the Student t test (α= .05). RESULTS: The Student t test demonstrated no significant differences between the values of the insertion and removal torques of the 2 groups (Group DH, P= .22 and Group OI, P= .42) or the removal torque values of the groups (P= .12). CONCLUSION: The results suggest that the strength required to loosen the abutment screws as measured by reverse torque is similar for both a double hexagon interface (DH) and an octagonal interface (OI).
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