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KMID : 0361920070370060407
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Korean Journal of Orthodontics
2007 Volume.37 No. 6 p.407 ~ p.420
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Comparison of finite element analysis of the closing patterns between first and second premolar extraction spaces
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Koh Shin-Ae
Im Won-Hee
Park Sun-Hyung
Chun Youn-Sic
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Abstract
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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
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KEYWORD
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FEA, Premolar extraction, Space closure, Rotation
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