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目的:测量新疆维吾尔族正常牙合成人头颅侧位片上牙弓后段的长度并对其上、下颌第三磨牙的生长发育状况进行评估分析,为临床正畸矫治设计、评估矫治效果及其稳定性的衡量提供参考依据。方法:选择新疆地区在校大学生18~24岁正常牙合维吾尔族成年人60例(其中男33例、女27例),平均(21.63±2.34)岁,拍摄曲面断层片及头颅侧位片,对其进行头影测量及统计学分析。结果:该年龄段维吾尔族正常牙合成人上牙弓后段长度男性(17.68±2.53)mm稍大于女性(17.32±2.30)mm,下牙弓后段长度男性(14.12±2.34)mm稍大于女性(13.56±2.49)mm,且上下颌牙弓后段长度统计学分析男女性别无显著性差异。上下颌第3磨牙出现率上颌为83.6%,下颌86.3%。下颌第三磨牙大多数均垂直向高位阻生,部分上颌第三磨牙为过小牙。结论:新疆维吾尔族正常牙合成人牙弓后段长度、第三磨牙出现率与汉族相比无显著性差异,但在下颌第三磨牙的萌出方向上存在不同,萌出方向以垂直向为主,此研究结果可以为分析新疆维吾尔族正常牙合成人牙弓后段状况提供参考。
OBJECTIVE: To measure the length of the posterior segment of the dental arch in the normal uterine dental unit and to evaluate the growth and development of the third molars of the upper and lower jaw in Xinjiang Uygur nationality. To evaluate the effect of orthodontic treatment and its stability Sexual measurements provide a reference. Methods: 60 adults (33 males and 27 females) with normal occlusion of Uyghur aged from 18 to 24 were enrolled in this study. The average age was (21.63 ± 2.34) Cephalometrical measurements and statistical analysis. Results: The length of the posterior segment of the upper arch of the Uygur nationality was slightly larger than that of the female (17.32 ± 2.30) mm and the length of the posterior segment of the lower arch (14.12 ± 2.34) mm was slightly larger than that of the female (13.56 ± 2.49) mm, and the length of the posterior segment of the maxillary and mandibular arch was no significant difference between men and women. The incidence of mandibular third molar was 83.6% in the maxilla and 86.3% in the mandible. Most of the third mandibular third molar were impacted vertically to the upper part of the third maxillary third molar is too small teeth. Conclusion: There is no significant difference in the length of posterior segment of dental arch and the incidence of third molars between Han and Uygur nationality. However, the eruption orientation of mandibular third molar is different. The direction of eruption is mainly vertical, The results of this study can provide a reference for the analysis of the posterior segment of dental arch of normal Uygur people in Xinjiang.