Lee Tae-Yeon, Kim Kyung-Ho, Yu Hyung-Seog, Kim Kee-Deog, Jung Young-Soo, Baik Hyoung-Seon
From the Departments of *Orthodontics, †General Dentistry, and ‡Oral and Maxillofacial surgery, School of Dentistry, Yonsei University, Seoul, South Korea.
J Craniofac Surg. 2014 Jul;25(4):1530-40. doi: 10.1097/SCS.0000000000000620.
This study was to investigate the correlation between changes of the soft and hard tissues three-dimensionally in class III orthognathic patients using cone-beam computed tomography.
Cone-beam computed tomography images were obtained within 2 weeks before surgery and at 6 months after surgery in 18 adult class III patients who underwent Le Fort I osteotomy and bilateral intraoral vertical ramus osteotomy. Subjects were divided into group 1 with no mandibular asymmetry (menton deviation, <2 mm; n = 9) and group 2 with mandibular asymmetry (menton deviation, >4 mm; n = 9). Landmarks were designated on the reconstructed three-dimensional models. Correlations and proportions of changes of the soft tissue to hard tissue were calculated.
There were significant correlations of ΔB' to ΔB and ΔPog' to ΔPog in both groups on the horizontal axis (P < 0.05), and their proportions were 0.53 and 0.67 in group 1 and 0.77 and 0.88 in group 2, respectively. There were significant correlations of ΔB' to ΔB, ΔPog' to ΔPog, and ΔMe' to ΔMe on the sagittal axis in both groups (P < 0.05), and their proportions were 0.94, 0.84, and 0.96 in group 1 and 0.95, 0.91, and 1.03 in group 2, respectively. There were significant correlations of the three-dimensional distances between ΔB' to ΔB, ΔPog' to ΔPog, and ΔMe' to ΔMe in both groups (P < 0.05), and their proportions were 0.92, 0.79, and 0.95 in group 1 and 0.92, 0.88, and 0.97 in group 2, respectively. However, there were no significant correlations between changes in soft and hard tissues on the vertical axis in both groups (P > 0.05).
In class III orthognathic patients with mandibular asymmetry, the proportions of ΔB' to ΔB, ΔPog' to ΔPog, and ΔMe' to ΔMe on the horizontal and sagittal axes and the three-dimensional distances were different from patients with no mandibular asymmetry.
本研究旨在使用锥形束计算机断层扫描三维研究Ⅲ类正颌患者软硬组织的变化相关性。
对18例行Le Fort I型截骨术和双侧口内垂直升支截骨术的成年Ⅲ类患者，在术前2周内及术后6个月获取锥形束计算机断层扫描图像。将受试者分为两组，第1组为无下颌不对称（颏点偏移＜2 mm；n = 9），第2组为下颌不对称（颏点偏移＞4 mm；n = 9）。在重建的三维模型上确定标志点。计算软组织与硬组织变化的相关性和比例。
两组在水平轴上ΔB'与ΔB、ΔPog'与ΔPog均存在显著相关性（P＜0.05），第1组其比例分别为0.53和0.67，第2组分别为0.77和0.88。两组在矢状轴上ΔB'与ΔB、ΔPog'与ΔPog、ΔMe'与ΔMe均存在显著相关性（P＜0.05），第1组其比例分别为0.94、0.84和0.96，第2组分别为0.95、0.91和1.03。两组中ΔB'与ΔB、ΔPog'与ΔPog、ΔMe'与ΔMe之间的三维距离均存在显著相关性（P＜0.05），第1组其比例分别为0.92、0.79和0.95，第2组分别为0.92、0.88和0.97。然而，两组在垂直轴上软硬组织变化之间均无显著相关性（P＞0.05）。
在下颌不对称的Ⅲ类正颌患者中，水平和矢状轴上ΔB'与ΔB、ΔPog'与ΔPog、ΔMe'与ΔMe的比例以及三维距离与无下颌不对称的患者不同。
