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KMID : 0362720160540030217
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Journal of the Korean Dental Association
2016 Volume.54 No. 3 p.217 ~ p.229
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Soft tissue evaluation using 3-dimensional face image after maxillary protraction therapy
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최동순:Choi Dong-Soon
이경훈:Lee Kyoung-Hoon/장인산:Jang In-San/차봉근:Cha Bong-Kuen
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Abstract
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Purpose: The aim of this study was to evaluate the soft-tissue change after the maxillary protraction therapy using threedimensional (3D) facial images.
Materials and Methods: This study used pretreatment (T1) and posttreatment (T2) 3D facial images from thirteen Class III
malocclusion patients (6 boys and 7 girls; mean age, 8.9 2.2 years) who received maxillary protraction therapy. The facial
images were taken using the optical scanner (Rexcan III 3D scanner), and T1 and T2 images were superimposed using forehead area as a reference. The soft-tissue changes after the treatment (T2-T1) were three-dimensionally calculated using 15 soft-tissue landmarks and 3 reference planes.
Results: Anterior movements of the soft-tissue were observed on the pronasale, subnasale, nasal ala, soft-tissue zygoma, and upper lip area. Posterior movements were observed on the lower lip, soft-tissue B-point, and soft-tissue gnathion area. Vertically, most soft-tissue landmarks moved downward at T2. In transverse direction, bilateral landmarks, i.e. exocanthion, zygomatic point, nasal ala, and cheilion moved more laterally at T2.
Conclusion: Facial soft-tissue of Class III malocclusion patients was changed three-dimensionally after maxillary protraction therapy. Especially, the facial profile was improved by forward movement of midface and downward and backward movement of lower face.
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KEYWORD
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Maxillary protraction, Class III malocclusion, Three-dimensional, Soft-tissue
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