Lee Kee-Joon, Joo Euk, Yu Hyung-Seog, Park Young-Chel
Assistant professor, Oral Science Research Center, Institute of Craniofacial Deformity, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea.
Am J Orthod Dentofacial Orthop. 2009 Sep;136(3):440-9. doi: 10.1016/j.ajodo.2007.05.028.
Ankylosis of a tooth is a pathologic condition commonly manifested by infraocclusion and vertical alveolar bone defect of the involved tooth. Extraction is often indicated in patients with severe tipping of adjacent teeth and serious infraocclusion, rather than attempting orthodontic repositioning. However, the residual alveolar bone defect after extraction must be restored adequately to establish sound dentition with a healthy periodontium. The bone-forming potential of sound periodontal ligament cells of the adjacent teeth can be used to restore the bone defect, through precisely controlled mesial movement of the root of the tilted molar. In this case report, a successful mesial root movement of the mandibular second molar is shown by the combined use of a conventional uprighting spring and orthodontic miniscrew implants in the mandibular premolar area. Adequate occlusion and periodontal health were restored in a 15-year-old girl with the typical sequela of an ankylosed molar.
牙齿粘连是一种病理状况，通常表现为受累牙齿的低位咬合和垂直牙槽骨缺损。对于相邻牙齿严重倾斜和严重低位咬合的患者，通常建议拔牙，而不是尝试正畸复位。然而，拔牙后残留的牙槽骨缺损必须得到充分修复，以建立具有健康牙周组织的良好牙列。通过精确控制倾斜磨牙牙根的近中移动，相邻牙齿健康牙周膜细胞的成骨潜能可用于修复骨缺损。在本病例报告中，通过在下颌前磨牙区联合使用传统直立弹簧和正畸微型螺钉种植体，成功实现了下颌第二磨牙牙根的近中移动。一名患有典型粘连磨牙后遗症的15岁女孩恢复了适当的咬合和牙周健康。
