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Cited 28 time in webofscience Cited 30 time in scopus
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Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

Authors
Lim, Yong-KyuChu, Eun-HyeLee, Dong-YulYang, Il-HyungBaek, Seung-Hak
Issue Date
Sep-2010
Publisher
E H ANGLE EDUCATION RESEARCH FOUNDATION, INC
Keywords
Three-dimensional evaluation; Facial scanning images; Class III malocclusion; Soft tissue change gradients; Mandibular setback surgery
Citation
ANGLE ORTHODONTIST, v.80, no.5, pp 896 - 903
Pages
8
Indexed
SCI
SCIE
SCOPUS
Journal Title
ANGLE ORTHODONTIST
Volume
80
Number
5
Start Page
896
End Page
903
URI
https://scholarworks.korea.ac.kr/kumedicine/handle/2020.sw.kumedicine/14598
DOI
10.2319/021210-90.1
ISSN
0003-3219
1945-7103
Abstract
Objective: To evaluate whether mandibular setback surgery (MSS) for Class III patients would produce gradients of three-dimensional (3D) soft tissue changes in the vertical and transverse aspects. Materials and Methods: The samples consisted of 26 Class Ill patients treated with MSS using bilateral sagittal split ramus osteotomy. Lateral cephalograms and 3D facial scan images were taken before and 6 months after MSS, and changes in landmarks and variables were measured using a Rapidform 2006. Paired and independent t-tests were performed for statistical analysis. Results: Landmarks in the upper lip and mouth corner (cheilion, Ch) moved backward and downward (respectively, cupid bow point, 1.0 mm and 0.3 mm, P < .001 and P < .01; alar curvature-Ch midpoint, 0.6 mm and 0.3 mm, both P < .001; Ch, 3.4 mm and 0.8 mm, both P < .001). However, landmarks in stomion (Stm), lower lip, and chin moved backward (Stm, 1.6 mm; labrale inferius [Li], 6.9 mm; LLBP, 6.9 mm; B', 6.7 mm; Pog', 6.7 mm; Me', 6.6 mm; P < .001, respectively). Width and height of upper and lower lip were not altered significantly except for a decrease of lower vermilion height (Stm-Li, 1.7 mm, P < .001). Chin height (B'-Me') was decreased because of backward and upward movement of Me' (3.1 mm, P < .001). Although upper lip projection angle and Stm-transverse projection angle became acute (Ch(Rt)-Ls-Ch(Lt), 5.7 degrees; Ch(Rt)-Stm-Ch(Lt), 6.4 degrees, both P < .001) because of the greater backward movement of Ch than Stm, lower lip projection angle and Stm-vertical projection angle became obtuse (Ch(Rt)-Li-Ch(Lt), 10.8 degrees; Ls-Stm-Li, 23.5 degrees, both P < .001) because of the larger backward movement of Li than labrale superius (Ls). Conclusions: Three-dimensional soft tissue changes in Class III patients after MSS exhibited increased gradients from upper lip and lower lip to chin as well as from Stm to Ch. (Angle Orthod. 2010;80:896-903.)
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2. Clinical Science > Department of Orthodontics > 1. Journal Articles
3. Graduate School > Graduate School of Clinical Dentistry > 1. Journal Articles

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Lee, Dong Yul
Guro Hospital (Department of Orthodontics, Guro Hospital)
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