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目的 :通过对下颌切牙先天缺失患者的观察了解其错牙合关系的情况。方法 :对第四军医大学口腔医学院正畸科门诊 1999— 2 0 0 1年 30 0 0余例病例进行调查 ,其中下颌切牙先天缺失 78例 ,观察其咬合关系 ,测量其覆牙合、覆盖、拥挤度。结果 :下颌切牙先天缺失咬合关系多为AngleⅠ类 ,上颌拥挤度平均值为7.11± 5 .5 6 92 ;下颌拥挤度平均值为 - 0 .5 735± 1.970 0 ;覆牙合平均值为 3.70 5 9± 2 .0 5 6 5 ;覆盖平均值为3.882 4± 2 .6 2 87。结论 :下颌切牙先天缺失 ,其咬合关系多为AngleⅠ类关系 ,下颌前牙并无过多间隙 ,通过上颌拥挤度的增加、覆牙合和覆盖的加大来补偿维持Ⅰ类关系所需间隙。在矫治这类错牙合畸形时应按情况拔除上颌牙齿或开辟下颌间隙再镶牙 ,以保持上下牙量的匹配
Objective: To understand the relationship between malocclusion and occlusion by observing patients with congenital absence of mandibular incisors. Methods: The orthodontic clinic of the Fourth Military Medical University from 1999 to 2001 was investigated in more than 300 cases. Among them, 78 cases of congenital absence of mandibular incisors were observed, the occlusal relationship was observed, Coverage, congestion. Results: The occlusion of the mandibular incisors was mostly Angle Ⅰ, the average maxillary crowding was 7.11 ± 5.56 92, the mean of the mandibular crowding was -0.5735 ± 1.970 0, and the average value of overbite was 3.70 5 9 ± 2 .0 5 6 5; the average coverage was 3.882 4 ± 2 .6 2 87. Conclusion: The mandibular incisor is a congenital defect. The occlusal relationship is mostly Angle Ⅰ. The anterior mandibular anterior mandibular anterior teeth have no excessive gaps. The gap needed to maintain the first-class relationship is compensated by the increase of maxillary crowding, . In the correction of such malocclusion deformity should be removed according to the situation of the maxillary teeth or open up the mandibular gap and then inlay, in order to maintain the matching of the amount of teeth