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Cortical bone strain during the placement of orthodontic microimplant studied by 3D finite element analysis  

Nam, Ok-Hyun (Department of Orthodontics, School of Dentistry, Kyungpook National University)
Yu, Won-Jae (Department of Orthodontics, School of Dentistry, Kyungpook National University)
Kyung, Hee-Moon (Department of Orthodontics, School of Dentistry, Kyungpook National University)
Publication Information
The korean journal of orthodontics / v.38, no.4, 2008 , pp. 228-239 More about this Journal
Abstract
Objective: The aim of this study was to evaluate the strain induced in the cortical bone surrounding an orthodontic microimplant during insertion. Methods: A 3D finite element method was used to model the insertion of a microimplant (AbsoAnchor SH1312-7, Dentos Co., Daegu, Korea) Into 1 mm thick cortical bone with a pre-drilled hole of 0.9 mm in diameter. A total of 1,800 analysis steps was used to simulate the 10 turns and 5 mm advancement of the microimplant. A series of remesh in the cortical bone was allowed to accommodate the change in the geometry accompanied by the implant insertion. Results: Bone strains of well higher than 4,000 microstrain, the reported upper limit for normal bone remodeling, was observed in the bone along the whole length of the microimplant. At the bone in the vicinity of the screw tip, strains of higher than 100% was recorded. The insertion torque was calculated at approximately 1.2 Ncm which was slightly lower than those measured from the animal experiment using rabbit tibias. Conclusions: The insertion process of a microimplant was successfully simulated using the 3D finite element method which showed that bone strains from a microimplant insertion might have a negative impact on physiological remodeling of bone.
Keywords
Microimplant; Strain during insertion; 3D finite element method; Rabbit experiment;
Citations & Related Records
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Times Cited By Web Of Science : 3  (Related Records In Web of Science)
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