國家衛生研究院 NHRI:Item 3990099045/12273
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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/12273


    Title: Abutment screw withdrawal after conical abutment settlement: A pilot study
    Authors: Yao, KT;Chang, TY;Fang, HW;Huang, CH;Wang, DH;Hsu, ML
    Contributors: Institute of Biomedical Engineering and Nanomedicine
    Abstract: OBJECTIVE: This study investigated the effects of abutment screw withdrawal after conical abutment settlement on the stability of the implant-abutment connection. MATERIAL AND METHODS: Twenty implants of a conical connection system were used. Two two-piece abutment designs were used: cone only (n = 10; NI) and cone plus octagonal index design (n = 10; I); for each design, five samples were used with (S) and without (NS) abutment screw withdrawal before a cyclic test. Finally, four groups, namely Gr S(NI), Gr S(I), Gr NS(NI), and Gr NS(I), were included. The cyclic test included cyclic loading of 20-200 N, 30 degrees , and 4-mm off-axis to implant axis at 10 Hz for 10(6) cycles, simulating a clinical time interval of 40 months. The fatigue cycles were recorded. The axial displacement of the conical abutments during abutment settlement, screw withdrawal, and cyclic loading were measured. Abutment morphology was examined through scanning electron microscopy (SEM). RESULTS: Only Gr NS(NI) failed the test, indicating that without the index design and abutment screw withdrawal, connection stability seriously deteriorated. Gr NS(I) exhibited significantly higher axial displacement into the implant after abutment settlement than did Gr NS(NI). It also exhibited continuous axial displacement into the implant after cyclic loading. SEM after cyclic testing in Gr NS(I) revealed marked burnishing on lateral edges of the index, indicating that the index design provides an antitorsional ability. CONCLUSION: Although this study has few limitations, abutment screw withdrawal is feasible in this conical implant-abutment connection system with index design.
    Date: 2020-02
    Relation: Clinical Oral Implants Research. 2020 Feb;31(2):144-152.
    Link to: http://dx.doi.org/10.1111/clr.13550
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0905-7161&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000497477400001
    Cited Times(Scopus): https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85075330860
    Appears in Collections:[Others] Periodical Articles

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