牙齿发育成熟程度的横向研究

目的：研究儿童牙齿发育的规律及牙龄。方法：观察南京市２３６名青少年儿童的全颌曲面断层片及手腕片,研究牙齿钙化的影像,对儿童的牙齿发育成熟状况进行横向研究。结果：上下颌尖牙的发育钙化速度最为均衡,显示很强的一致性,在儿童青春发育期的加速期、高峰期、减峰期、减速期,牙齿的钙化分布分别为：上颌尖牙Ｆ期８２．３５％、Ｇ期９８．１０％、Ｈ期７８．２６％,下颌尖牙Ｆ期７８．２９％、Ｇ期９２．３８％、Ｈ期９５．

A Cross- sectional Study on Dental Development maturation degree

Objective: To study the pattern of dental development and tooth age. Methods: Panoramic jaw laminagram of 236 children and adolescents were observed to evaluate the degrees of tooth calcification and development maturation. Results: Maxillary canine teeth were similar to mandibular canine teeth in the calcific velocity. The calcification degrees of maxillary canine teeth and mandibular canine teeth were 82.35%(F), 98.10%(G), 78.26%(H), and 78.26%(F), 92.38%(G), 95.65%(H) respectively, gender differences did not been found. Maxilla differed from mandible in the calcific velocity of first, second premolar and second molar. Conclusion: Canine tooth could be taken as a predictor of tooth age.