Department of Orthodontics, School of Dentistry, Universidade Luterana do Brasil, Canoas, Rio Grande do Sul, Brazil.
Am J Orthod Dentofacial Orthop. 2012 Jan;141(1):81-6. doi: 10.1016/j.ajodo.2011.06.037.
Our objective was to compare vertical alveolar growth in areas adjacent to infraoccluded deciduous molars with growth in areas of deciduous molars and normal occlusion for a period of at least 1 year by using digital subtraction radiography.
This case-control study included 40 pairs of panoramic radiographs of growing patients with infraoccluded deciduous molars and 40 pairs of radiographs of patients without infraoccluded deciduous molars. One radiograph at baseline was obtained at diagnosis, and the other at least 1 year later. The subjects and the controls were matched according to chronologic age and time interval between the 2 radiographs. The 2 groups were compared with regard to vertical alveolar growth and vertical tooth movement. Measurements were assessed by using nonparametric tests (Mann-Whitney and Friedman) and a multiple comparison test. Significance was set at 5%.
A statistically significant difference was observed between the groups with regard to vertical alveolar growth measured on the bone crest between the first permanent molars and second premolars.
Vertical alveolar growth between the first permanent molar and the second premolar adjacent to the infraoccluded teeth was smaller than in areas adjacent to teeth with normal occlusion.
我们的目的是通过数字化减影放射影像学比较至少 1 年时间内萌出恒牙近中被阻生的乳牙周围的垂直牙槽骨生长与乳牙和正常咬合部位的生长。
这项病例对照研究纳入了 40 对存在萌出恒牙近中被阻生的乳牙的患者和 40 对无恒牙近中被阻生的乳牙患者的全景片。在诊断时获得基线的 1 张放射片，至少 1 年后获得另 1 张放射片。根据年龄和 2 张放射片之间的时间间隔对研究对象和对照组进行匹配。比较两组垂直牙槽骨生长和垂直牙齿移动。采用非参数检验（Mann-Whitney 和 Friedman）和多重比较检验对测量值进行评估。以 5%为显著性水平。
在第一恒磨牙和第二前磨牙牙槽嵴之间的垂直牙槽骨生长方面，两组之间存在统计学显著差异。
萌出恒牙近中被阻生的乳牙周围的垂直牙槽骨生长小于正常咬合部位的牙槽骨生长。
