摘要
目的:分析比较Angle Ⅱ1 和正常(牙合)牙弓形态差异.方法:以年龄均为13～17 岁的Angle Ⅱ1和正常(牙合)各60 名为研究对象,利用YM-2115 三维测量仪在所有个体的上下颌模型上标定对应于牙尖及切缘中点的标志点,用欧几里德距离矩阵分析法(Euclidean-distance matrix analysis, EDMA)分析Angle Ⅱ1和正常(牙合)的牙弓形态差异. 结果:(1)无论男女性,Angle Ⅱ1的上牙弓长度大于正常(牙合)的上牙弓,女性大1.8%,男性大2.7%;二者的牙弓形态差异有显著性(P<0.001),且后牙对形态差异所起的作用较前牙大,其中Angle Ⅱ1 的后上牙弓宽度较正常(牙合)窄是一主要因素.(2)无论男女性,Angle Ⅱ1 的下牙弓长度稍大于正常(牙合)的下牙弓,二者的牙弓形态差异无显著性.结论:临床上扩展Angle Ⅱ1 的后上牙弓宽度可能是协调上下牙弓形态的重要措施之一.
Objective： To evaluate differences in dental arch forms between the subjects with Angle Ⅱ division 1 （ Angle Ⅱ^1） and those with normal occlusion. Methods ： 60 Angle Ⅱ^1 patients and 60 normal occlusion subjects aged 13 - 17 years old were selected. Fourteen landmarks, corresponding to the cusp tips and incisor edges, were identified on the upper and lower dental casts of all subjects by YM -21115 three dimension measuring machine. Arch form differences between Angle Ⅱ^1 and normal occlusion subjects were assessed by Euclidean distance matrix analysis （EDMA）. Results： （ 1 ） In both sexes, the upper arch of Angle Ⅱ^1 subjects was larger than that of normal occlusion （ 1.8% for females and 2.7% for males） ; and arch shape difference was also significantly different（ P 〈 0. 001 ）. The area of posterior teeth contributed more to the form difference between two groups than that of anterior teeth, maxillary posterior arch width of Angle Ⅱ^1 subjects was narrower than that of normal occlusion. （ 2）The lower arch of Angle Ⅱ^1 subjects was slightly larger than that of normal occlusion, and there was no significance difference between males and famales. Conclusion： Expanding maxillary posterior arch width in Angle Ⅱ^1 patients may be one of the important methods to harmonize upper and lower arch form.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2005年第5期659-662,共4页
Journal of Practical Stomatology
