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Effective en-masse retraction design with orthodontic mini-implant anchorage: A finite element analysis

Title
Effective en-masse retraction design with orthodontic mini-implant anchorage: A finite element analysis
Authors
Sung S.-J.Jang G.-W.Chun Y.-S.Moon Y.-S.
Ewha Authors
전윤식
SCOPUS Author ID
전윤식scopus
Issue Date
2010
Journal Title
American Journal of Orthodontics and Dentofacial Orthopedics
ISSN
0889-5406JCR Link
Citation
vol. 137, no. 5, pp. 648 - 657
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Introduction: The strategic design of an appliance for correcting a bialveolar protrusion by using orthodontic mini-implant anchorage and sliding mechanics must take into account the position and height of the mini-implant, the height of the anterior retraction hook and compensating curve, and midline vertical traction. In this study, we used finite element analysis to examine effective en-masse retraction with orthodontic mini-implant anchorage and sought to identify a better combination of the above factors. Methods: Base models were constructed from a dental study model. Models with labially and lingually inclined incisors were also constructed. The center of resistance for the 6 anterior teeth in the base model was 9 mm superiorly and 13.5 mm posteriorly from the midpoint of the labial splinting wire. The working archwires were assumed to be 0.019 × 0.025-in or 0.016 × 0.022-in stainless steel. The amount of tooth displacement after finite element analysis was magnified 400 times and compared with central and lateral incisor and canine axis graphs. Results and Conclusions: The tooth displacement tendencies were similar in all 3 models. The height of the anterior retraction hook and the placement of the compensating curve had limited effects on the labial crown torque of the central incisors for en-masse retraction. The 0.016 × 0.022-in stainless steel archwire showed more tipping of teeth compared with the 0.019 × 0.025-in archwire. For high mini-implant traction and 8-mm anterior retraction hook condition, the retraction force vector was applied above the center of resistance for the 6 anterior teeth, but no bodily retraction of the 6 anterior teeth occurred. For high mini-implant traction, 2-mm anterior retraction hook, and 100-g midline vertical traction condition, the 6 anterior teeth were intruded and tipped slightly labially. Copyright © 2010 by the American Association of Orthodontists.
DOI
10.1016/j.ajodo.2008.06.036
Appears in Collections:
의학전문대학원 > 의학과 > Journal papers
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