Kurol J, Owman-Moll P
Department of Orthodontics, Lund University, Faculty of Odontology, Malmö, Sweden.
Angle Orthod. 1998 Apr;68(2):161-5. doi: 10.1043/0003-3219(1998)068<0161:HARRDE>2.3.CO;2.
The aim of this investigation was to study the hyalinization of the periodontal ligament with time and its relationship to root surface resorption after the application of an orthodontic force, reactivated weekly, of 50 cN (approximately 50 g). Fifty-six patients (18 boys and 38 girls, mean age 13.8 years) were divided into 7 groups of 8. In each patient, one premolar was moved buccally 161 with a fixed orthodontic appliance. The contralateral premolar served as a control. The experimental periods ranged from 1 to 7 weeks. Local areas of overcompression in the periodontal ligament were recorded in 33 test teeth (59%) and 2 controls (4%). Hyalinization was seen in all experimental groups, more often after the first 4 weeks of force application. Hyalinized areas were recorded opposite an intact root surface (54%) or close to and just apical or coronal to an area of root resorption (45%), and were usually located buccocervically and linguoapically, corresponding to expected pressure zones of the periodonal ligament.
本研究的目的是探讨在每周重新施加50 cN（约50 g）正畸力后，牙周膜透明样变随时间的变化及其与牙根表面吸收的关系。56例患者（18名男性和38名女性，平均年龄13.8岁）被分为7组，每组8人。在每位患者中，使用固定正畸矫治器将一颗前磨牙向颊侧移动161 。对侧前磨牙作为对照。实验周期为1至7周。在33颗试验牙（59%）和2颗对照牙（4%）中记录到牙周膜局部过度受压区域。在所有实验组中均可见透明样变，在施加力的前4周后更为常见。透明样变区域见于完整牙根表面相对处（54%）或靠近牙根吸收区域且恰好在其根尖或冠方（45%），通常位于颊颈侧和舌侧，对应于牙周膜预期的压力区。
