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Factors controlling anterior torque during C-implant-dependent en-masse retraction without posterior appliances

Title
Factors controlling anterior torque during C-implant-dependent en-masse retraction without posterior appliances
Authors
Mo S.-S.Kim S.-H.Sung S.-J.Chung K.-R.Chun Y.-S.Kook Y.-A.Nelson G.
Ewha Authors
전윤식
SCOPUS Author ID
전윤식scopus
Issue Date
2011
Journal Title
American Journal of Orthodontics and Dentofacial Orthopedics
ISSN
0889-5406JCR Link
Citation
vol. 140, no. 1, pp. 72 - 80
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Introduction: Our objective was to evaluate the factors that affect effective torque control during en-masse incisor and canine retraction when using partially osseointegrated C-implants (Cimplant, Seoul, Korea) as the exclusive source of anchorage without posterior bonded or banded appliances. Methods: Base models were constructed from a dental study model. No brackets or bands were placed on the maxillary posterior dentition during retraction. The working archwire was modeled by using a 3-dimensional beam element (ANSYS beam 4, Swanson Analysis System, Canonsburg, Pa) with a cross section of 0.016 × 0.022-in stainless steel. Different heights of anterior retraction hooks and different degrees of gable bends were applied to the working utility archwire that was placed into the 0.8-mm diameter hole of the C-implant to generate anterior torque on the anterior segment of the teeth. The amount of tooth displacement after finite element analysis was exaggerated 70 times and compared with tooth-axis graphs of the central and lateral incisors and the canine. Results: The height of the anterior retraction hook and the degree of the gable bend had a combined effect on the labial crown torque applied to the incisors during en-masse retraction. By using 30° gable bends and the longest hook, lingual root movement of the 6 anterior teeth occurred. By using 20° gable bends, the 6 anterior teeth showed a translation tendency during retraction. Conclusions: Three-dimensional en-masse retraction of the 6 anterior teeth can be accomplished by using partially osseointegrated C-implants as the only source of anchorage, gable bends, and a long retraction hook (biocreative therapy type I technique). Copyright © 2011 by the American Association of Orthodontists.
DOI
10.1016/j.ajodo.2009.09.026
Appears in Collections:
의학전문대학원 > 의학과 > Journal papers
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