青少年期正畸治疗与上中切牙牙根吸收的关系

目的 探讨青少年错He畸形患者在正畸治疗中，牙齿移动与上中切牙根尖吸收之间的关系。方法 随机选择具有完整病例资料的青少年错He畸形患者为研究对象，经与对照组匹配后，确定其中58例为研究样本，分别以治疗前后根尖片测量中切片根吸收的情况，以头颅侧位片测量治疗前后牙根在前后向及垂直向的位移植并作多元回归分析。结果 根吸收与牙根尖的龈向压入具有极显著的负相关关系（P＜0.001)，与牙根尖的He向伸长也表现出有统计学意义的负相关（P＜0.05)，但根吸收与牙根尖在水平方向的位移却未表现出明显的相关。多元回归结果还显示，治疗过程中牙根尖位移为零时，根尖的平均吸收量达到2.29mm，有显著的统计学意义。结论 青少年在生长发育期进行正畸治疗，正畸牙移动量与牙根尖吸收量之间存在正相关的可能性很小。

The relationship between apical root resorption and orthodontic tooth movement in growing subjects

OBJECTIVE: To investigate the relationship between apical root resorption and orthodontic tooth movement in growing subjects. METHODS: 58 growing subjects were collected randomly into the study sample and another 40 non-treated cases were used as control. The apical resoption of the upper central incisors was measured on periapical film and the incisor displacement was measured on lateral cephalogram. Using multiple linear regression analysis to examine the relationship between root resoption and the displacement of the upper incisor apex in each of four direction (retraction, advancement, intrusion and extrusion). RESULTS: The statistically significant negative association were found between resorption and both intrusion (P < 0.001) and extrusion (P < 0.05), but no significant association was found between resorption and both retraction and advancement. The regression analysis implied an average of 2.29 mm resorption in the absence of apical displacement. CONCLUSIONS: The likelihood that the magnitude of displacement of the incisor root is positively associated with root resoption in the population of treated growing subjects is very small.