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目的比较安氏二类错颌畸形的氟斑牙患者在拔牙1周及8周后远移尖牙的速度和牙槽骨吸收面积比值,评价氟斑牙尖牙远移时机对二者的影响。方法选取30例安氏二类错颌畸形的氟斑牙患者的双侧上颌60颗尖牙作为研究对象,在拔除上颌第一前磨牙后1周和8周后开始牵引上颌不同侧尖牙向远中移动,直至与上颌第二前磨牙接触,实验开始前及结束后制取石膏模型及拍摄口腔全景片,测量尖牙远移速度,应用Auto CAD软件测量尖牙牙槽骨吸收面积比值。结果拔牙1周及8周后移动尖牙,氟斑牙组的尖牙远移速度及牙槽骨吸收面积比值均存在差异(P<0.01),且牙槽骨吸收面积比值大于同期对照组(P<0.01);氟斑牙与尖牙远移速度及牙槽骨吸收面积比值存在相关(P<0.05),尖牙远移时机与尖牙移动速度存在相关(P<0.01)。结论与无氟斑牙患儿相比,安氏二类错颌畸形的氟斑牙患者在矫治中更易出现牙槽骨吸收,故不宜于拔牙后早期开始远移尖牙。
Objective To compare the rate of distal canine teeth and alveolar bone resorption area after dental extraction for 1 week and 8 weeks in dental fluorosis patients with Class Ⅱ malocclusion so as to evaluate the influence of the timing of distal remodeling of dental fluorosis. Methods Forty-two maxillary canines of 30 patients with dental malocclusion of Class 2 malocervical malocclusion were selected as the study object. One week and 8 weeks after removal of maxillary first premolar, Before moving to the maxillary second premolar, the gypsum model and panoramic film were taken before and after the experiment. The canine distal migration rate was measured. The ratio of the alveolar bone area absorbed by the canine was measured by Auto CAD software. Results There was a significant difference in the canine moving speed and alveolar bone resorption area (P <0.01) between teeth of 1 and 8 weeks after tooth extraction, and the ratio of alveolar bone resorption area was greater than that of the control group P <0.01). There was a correlation between dental fluorosis and canine distal migration rate and alveolar bone resorption area ratio (P <0.05). There was a correlation between canine distal migration timing and canine movement velocity (P <0.01). Conclusion Compared with children without fluoride dental fluorosis, Class II malocclusion patients with dental fluorosis in orthodontics more prone to alveolar bone resorption, it is not appropriate to begin early after tooth extraction distal fang.