Three-dimensional changes in lip vermilion morphology of adult female patients after extraction and non-extraction orthodontic treatment
Liu Zhi-Yu, Yu Jie, Dai Fan-Fan, Jiang Ruo-Ping, Xu Tian-Min,
소속 상세정보
( Liu Zhi-Yu ) - Peking University School and Hospital of Stomatology Department of Orthodontics
( Yu Jie ) - Hunan University of Traditional Chinese Medicine First Affiliated Hospital Department of Stomatology
( Dai Fan-Fan ) - Peking University School and Hospital of Stomatology Second Dental Center
( Jiang Ruo-Ping ) - Peking University School and Hospital of Stomatology Department of Orthodontics
( Xu Tian-Min ) - Peking University School and Hospital of Stomatology Department of Orthodontics
Abstract
Objective: To investigate the three-dimensional lip vermilion changes after extraction and non-extraction orthodontic treatment in female adult patients and explore the correlation between lip vermilion changes and incisor changes.
Methods: Forty-seven young female adult patients were enrolled in this study (skeletal Class III patients were excluded), including 34 lip-protruding patients treated by extraction of four first premolars (18 patients requiring mini-implants for maximum anchorage control and 16 patients without mini-implants) and 13 patients requiring non-extraction treatment. Nine angles, seven distances, and the surface area of the lip vermilion were measured by using pre- and post-treatment three-dimensional facial scans. Linear and angular measurements of incisors were performed on lateral cephalograms.
Results: There were no significant changes in the vermilion measurements in the non-extraction group. The vermilion angle, vermilion height, central bow angle, height/width ratio, and vermilion surface area decreased significantly after the orthodontic treatment in the extraction groups, but the upper/lower vermilion proportion remained unchanged. Significant correlations were found between the changes in incisor position and those in vermilion angles, vermilion height, and surface area.
Conclusions: Extraction of the four first premolars probably produced an aesthetic improvement in lip vermilion morphology. However, the upper/lower vermilion proportion remained unchanged. The variations in the vermilion were closely related to incisor changes, especially the upper incisor inclination changes.
키워드
Lip vermilion; Three-dimensional scanner; Adult treatment; Incisor changes
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