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Comparison of finite element analysis of the closing patterns between first and second premolar extraction spaces  

Koh, Shin-Ae (Department of Orthodontics, School of Dentistry and Dental Research Institute, Seoul National University)
Im, Won-Hee (Department of Orthodontics, School of Dentistry and Dental Research Institute, Seoul National University)
Park, Sun-Hyung (Department of Dentistry, Graduates School of Medicine, Ewha Woman University)
Chun, Youn-Sic (Department of Dentistry, Graduates School of Medicine, Ewha Woman University)
Publication Information
The korean journal of orthodontics / v.37, no.6, 2007 , pp. 407-420 More about this Journal
Abstract
The aim of this study was to compare the differences in closing extraction spaces between maxillary first premolar and second premolar extractions using 3-dimensional finite element analysis (FEA). Methods: Maxillary artificial teeth were selected according to Wheeler's dental anatomy. The size and shape of each tooth, bracket and archwire were made from captured real images by a 3D laser scanner and FEA was performed with a 10-noded tetrahedron. A $10^{\circ}$ gable bend was placed behind the bull loop on a $0.017"{\times}0.025"$ archwire. The extraction space was then closed through 12 repeated activating processes for each 2mm of space. Results and Conclusions: The study demonstrated that the retraction of anterior teeth was less for the second premolar extraction than for the first premolar extraction. The anterior teeth showed a controlled tipping movement with slight extrusion, and the posterior teeth showed a mesial-in rotational movement. For the second premolar extraction, buccal movement of posterior teeth was highly increased.
Keywords
FEA; Premolar extraction; Space closure; Rotation;
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Times Cited By KSCI : 4  (Citation Analysis)
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