上颌第二磨牙错(牙合)畸形的相关因素研究

目的：探讨上颌第二磨牙错?畸形的种类及相关因素。方法：随机抽取110例符合条件的正畸患者，对其进行模型及全口曲面断层片分析。统计上颌第二磨牙错?畸形的患病率、分类及临床表现。结果：上颌第二磨牙错牙合畸形患病率为59.09％，其中颊向错位占上颌第二磨牙错牙合畸形的68.75％，男女之间差异无统计学意义（P=0.054）。其与上颌牙槽弓局部宽度呈负相关关系(P=0.026)；与牙弓后段拥挤度(P=0.070)、上颌第三磨牙牙胚(P=0.453)、安氏错牙合分类 (P=0.235)之间无相关性（P>0.05）。结论：上颌第二磨牙错牙合畸形与上颌牙槽弓局部宽度有关；与牙弓后段拥挤度、上颌第三磨牙牙胚、安氏错牙合分类无关，男女之间无差异。

Related-factors of upper second molars malocclusion

Objective: To investigate the type of upper second molar malocclusion and its related-factors.Methods: 110 patients were randomly enrolled in this study and their models and panoramic radiographs were analyzed.The prevalence,classification and clinical manifestation of upper second molars malocclusion were analyzed.Results: The prevalence of the upper second molar malocclusion was 59.09%,and the buccoversion occupied 68.75%.There was not a significant difference between men and women.There was an inverse correlation between the widths of upper alveolar arch at upper second molar level and the upper second molars malocclusion(P=0.026).It was also found that the crowding of the buccal segment,tooth germ of upper third molar and Angle classification of malocclusion had no correlation with upper second molars malocclusion.Conclusion: The malocclusion of the upper second molars is correlated with the upper alveolar arch width at the second molar level and is not correlated with the crowding of the buccal segment,tooth germ of upper third molar and Angle classification of malocclusion.Furthermore,there is no difference between men and women.