Harris E F, Baker W C
Department of Orthodontics, College of Dentistry, University of Tennessee, Memphis.
Am J Orthod Dentofacial Orthop. 1990 Nov;98(5):463-9. doi: 10.1016/s0889-5406(05)81656-7.
It is broadly documented that orthodontic tooth movement enhances the risk of apical root resorption and loss of alveolar crestal bone height, but virtually all studies have focused on the conventional adolescent patient. In this study, samples from adolescent and adult patients were matched for sex, malocclusion, and treatment regimen. In-treatment changes in root length were the same for both groups, whereas loss of crestal bone height was somewhat greater in adults. Major differences, however, were found at the start of treatment: Adults (mean = 28 years) had significantly shorter roots and greater alveolar recession than the young teenagers (mean = 12 years). Consequently, treatment per se does not place adults at greater risk; it is the involvement extant at the start of mechanotherapy that merits careful evaluation.
大量文献记载，正畸牙齿移动会增加根尖根吸收和牙槽嵴顶骨高度丧失的风险，但几乎所有研究都集中在传统的青少年患者身上。在本研究中，对青少年和成年患者的样本按性别、错牙合畸形和治疗方案进行匹配。两组治疗期间的牙根长度变化相同，而成年人的牙槽嵴顶骨高度丧失则略多一些。然而，在治疗开始时发现了主要差异：成年人（平均28岁）的牙根明显比青少年（平均12岁）短，牙槽骨退缩更明显。因此，治疗本身并不会使成年人面临更大风险；值得仔细评估的是机械治疗开始时就存在的情况。
