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通过对西安地区６０名乳前牙反及１３０名乳牙正常牙弓形态特征的调查结果显示：反组上牙弓长度及宽度均小于正常组，下牙弓则大于正常组，长度的差异程度较宽度明显。牙间隙上牙列较正常组少，下牙列较正常组多。终末平面关系两组间差异最为显著，反组为１００％近中型关系。对上述改变的发生机制及临床意义进行了探讨。
The results of the investigation on the morphological characteristics of the dental arch of 60 anterior teeth and the normal teeth of 130 primary teeth in Xi'an area showed that the length and width of the dental arch in the inverted group were less than those in the normal group and the lower dental arch was larger than that in the normal group, The extent of the difference between the length of the more obvious width. Teeth on the gap between the teeth than normal group, lower dentition more than normal group. End-plane relationship between the two groups the most significant difference, anti- group was 100% near-medium relationship. The mechanism and clinical significance of the above changes were discussed.