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Factors controlling anterior torque with C-implants depend on en-masse retraction without posterior appliances: Biocreative therapy type II technique

Title
Factors controlling anterior torque with C-implants depend on en-masse retraction without posterior appliances: Biocreative therapy type II technique
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. 139, no. 2, pp. e183 - e191
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Introduction: Our objective was to evaluate the factors that affect effective torque control during en-masse anterior retraction by using intrusion overlay archwire and partially osseointegrated C-implants as the exclusive sources of anchorage without posterior bonded or banded attachments. Methods: Base models were constructed from a dental study model. No brackets or bands were placed on the posterior maxillary dentition during retraction. Different heights of the anterior retraction hooks to the working segment archwire and different intrusion forces with an overlay archwire placed in the 0.8-mm diameter hole of the C-implant were applied to generate 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 amount of intrusion force had a combined effect on the labial crown torque applied to the incisors during en-masse retraction. The difference of anterior retraction hook length highly affected the torque control and also induced a tendency for canine extrusion. Conclusions: Three-dimensional en-masse retraction of the anterior teeth as an independent segment can be accomplished by using partially osseointegrated C-implants as the only source of anchorage, an intrusion overlay archwire, and a retraction hook (biocreative therapy type II technique). © 2011 by the American Association of Orthodontists.
DOI
10.1016/j.ajodo.2010.09.023
Appears in Collections:
의학전문대학원 > 의학과 > Journal papers
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