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KMID : 0361920070370030171
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Korean Journal of Orthodontics
2007 Volume.37 No. 3 p.171 ~ p.181
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Torque and mechanical failure of orthodontic micro-implant influenced by implant design parameters
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Yu Won-Jae
Kyung Hee-Moon
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Abstract
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Objective: The present study was aimed at an analytical formulation of the micro-implant related torque as a function of implant size, i.e. the diameter and length, screw size, and the bony resistance at the implant to bone interface.
Methods: The resistance at the implant to cancellous bone interface (S_{can}) was assumed to be in the range of 1.0-2.5 MPa. Micro-implant model of Absoanchor (Dentos Inc. Daegu, Korea) was used in the course of the analysis.
Results: The results showed that the torque was a strong function of diameter, length, and the screw height. As the diameter increased and as the screw size decreased, the torque index decreased. However the strength index was a different function of the implant and bone factors. The whole Absoanchor implant models were within the safe region when the resistance at the implant/cancellous bone (=S_{can}) was 1.0 or less.
Conclusion: For bone with S_{can} of 1.5 MPa, the cervical diameter should be greater than 1.5 mm if micro-implant models of 12 mm long are to be placed. For S_{can} of 2.0 MPa, micro-implant models of larger cervical diameter than 1.5 mm were found to be safe only if the endosseous length was less than 8 mm.
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KEYWORD
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Orthodontic micro-implant, Design parameter, Torque, Torsional failure
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