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Torque control during lingual anterior retraction without posterior appliances

Title
Torque control during lingual anterior 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
2013
Journal Title
Korean Journal of Orthodontics
ISSN
1225-5610JCR Link
Citation
vol. 43, no. 1, pp. 3 - 14
Indexed
SCOPUS; KCI WOS scopus
Abstract
To evaluate the factors that affect torque control during anterior retraction when utilizing the C-retractor with a palatal miniplate as an exclusive source of anchorage without posterior appliances. Methods: The C-retractor was modeled using a 3-dimensional beam element (0.9-mm-diameter stainless-steel wire) attached to mesh bonding pads. Various vertical heights and 2 attachment positions for the lingual anterior retraction hooks (LARHs) were evaluated. A force of 200 g was applied from each side hook of the miniplate to the splinted segment of 6 or 8 anterior teeth. Results: During anterior retraction, an increase in the LARH vertical height increased the amount of lingual root torque and intrusion of the incisors. In particular, with increasing vertical height, the tooth displacement pattern changed from controlled tipping to bodily displacement and then to lingual root displacement. The effects were enhanced when the LARH was located between the central and lateral incisors, as compared to when the LARH was located between the lateral incisors and canines. Conclusions: Three-dimensional lingual anterior retraction of the 6 or 8 anterior teeth can be accomplished using the palatal miniplate as the only anchorage source. Using LARHs at different heights or positions affects the quality of torque and intrusion. © 2013 The Korean Association of Orthodontists.
DOI
10.4041/kjod.2013.43.1.3
Appears in Collections:
의과대학 > 의학과 > Journal papers
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