Three-dimensional assessment of upper lip positional changes according to simulated maxillary anterior tooth movements by white light scanning
Kim Hwee-Ho, 이진우, 차경석, 정동화, 이상민,
소속 상세정보
( Kim Hwee-Ho ) - Dankook University School of Dentistry Department of Orthodontics
이진우 ( Lee Jin-Woo ) - Dankook University School of Dentistry Department of Orthodontics
차경석 ( Cha Kyung-Suk ) - Dankook University School of Dentistry Department of Orthodontics
정동화 ( Chung Dong-Hwa ) - Dankook University School of Dentistry Department of Orthodontics
이상민 ( Lee Sang-Min ) - Dankook University School of Dentistry Department of Orthodontics
KMID : 0361920140440060281
Abstract
Objective: Esthetic improvements during orthodontic treatment are achieved by changes in positions of the lips and surrounding soft tissues. Facial soft-tissue movement has already been two-dimensionally evaluated by cephalometry. In this study, we aimed to three-dimensionally assess positional changes of the adult upper lip according to simulated maxillary anterior tooth movements by white light scanning.
Methods: We measured changes in three-dimensional coordinates of labial landmarks in relation to maxillary incisor movements of normal adults simulated with films of varying thickness by using a white light scanner.
Results: With increasing protraction, the upper lip moved forward and significantly upward. Labial movement was limited by the surrounding soft tissues. The extent of movement above the vermilion border was slightly less than half that of the teeth, showing strong correlation. Most changes were concentrated in the depression above the upper vermilion border. Labial movement toward the nose was reduced significantly.
Conclusions: After adequately controlling several variables and using white light scanning with high reproducibility and accuracy, the coefficient of determination showed moderate values (0.40?0.77) and significant changes could be determined. This method would be useful to predict soft-tissue positional changes according to tooth movements.
키워드
Three-dimensional scanner; Soft tissue; Esthetics; Lip changing
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