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KMID : 0361920090390050278
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Korean Journal of Orthodontics
2009 Volume.39 No. 5 p.278 ~ p.288
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Finite-element analysis of the shift in center of resistance of the maxillary dentition in relation to alveolar bone loss
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Sung Sang-Jin
Kim In-Tae
Kook Yoon-Ah
Chun Youn-Sic
Kim Seong-Hun
Mo Sung-Seo
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Abstract
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Objective: The aim of this study was to investigate the changes in the center of resistance of the maxillary teeth in relation to alveolar bone loss.
Methods: A finite element model, which included the upper dentition and periodontal ligament, was designed according to the amount of bone loss (0 mm, 2 mm, 4 mm). The teeth in each group were fixed with buccal and lingual arch wires and splint wires. Retraction and intrusion forces of 200 g for 4 and 6 anterior teeth groups and 400 g for the full dentition group were applied.
Results: The centers of resistance were at 13.5 mm, 14.5 mm, 15 mm apical and 12 mm, 12 mm, 12.5 mm posterior in the 4 incisor group; 13.5 mm, 14.5 mm, 15 mm apical and 14 mm, 14 mm, 14.5 mm posterior in the 6 anterior teeth group; and 11 mm, 13 mm, 14.5 mm apical and 26.5 mm, 27 mm, 25.5 mm posterior in the full dentition group respectively according to 0 mm, 2 mm, 4 mm bone loss.
Conclusions: The center of resistance shifted apically and posteriorly as alveolar bone loss increased in 4 and 6 anterior teeth groups. However, in the full dentition group, the center of resistance shifted apically and anteriorly in the 4 mm bone loss model.
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KEYWORD
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Finite element analysis, Center of resistance, Alveolar bone loss, Maxillary full dentition
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