Torque control during lingual anterior retraction without posterior appliances
모성서, 김성훈, 성상진, 정규림, Chun Yun-Sic, 국윤아, Nelson Gerald,
소속 상세정보
모성서 ( Mo Sung-Seo ) - Catholic University College of Medicine Department of Dentistry
김성훈 ( Kim Seong-Hun ) - Kyung Hee University School of Dentistry Department of Orthodontics
성상진 ( Sung Sang-Jin ) - University of Ulsan College of Medicine Asan Medical Center Department of Orthodontics
정규림 ( Chung Kyu-Rhim ) - Ajou University School of Medicine Department of Dentistry
( Chun Yun-Sic ) - Ewha Womans University School of Medicine Department of Dentistry
국윤아 ( Kook Yoon-Ah ) - Catholic University College of Medicine Department of Dentistry
( Nelson Gerald ) - USA University of California at San Francisco
KMID : 0361920130430010003
Abstract
Objective: 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.
키워드
C-retractor; Lingual; Miniplate; Anchorage
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