Soft tissue evaluation using 3-dimensional face image after maxillary protraction therapy

Choi,  Dong-Soon; Lee,  Kyoung-Hoon; Jang,  Insan; Cha,  Bong-Kuen

J Korean Dent Assoc > Volume 54(3); 2016 > Article

The Journal of The Korean Dental Association 2016;54(3):217-229.
Published online March 31, 2016.

3차원 얼굴 영상을 이용한 상악 전방견인 치료 후의 연조직 평가

최동순¹, 이경훈², 장인산³, 차봉근⁴

^¹강릉원주대학교 치과대학 치과교정학교실
^²강릉원주대학교 치과대학 치과교정학교실
^³강릉원주대학교 치과대학 치과교정학교실
^⁴강릉원주대학교 치과대학 치과교정학교실

Soft tissue evaluation using 3-dimensional face image after maxillary protraction therapy

Dong-Soon Choi¹, Kyoung-Hoon Lee², Insan Jang³, Bong-Kuen Cha⁴

¹Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University
²Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University
³Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University
⁴Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University

Abstract

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, 8.9pm2.2years) 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.

Key Words: Maxillary protraction;Class III malocclusion;Three-dimensional;Soft-tissue;