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在145个长春地区出土的中国成人下领骨（男117，女28）标本上，对下颌与下颌牙槽弓三角进行了测量，结果表明：同一个体三角形的三条边长间及不同个体三角形大小的差异均具有高度显著性，P＜0.01。男女性三角形的各相应边长差异亦相当显著.经q检验，长春地区出土的中国成人下颌骨的下颌与下颌牙槽弓三角属于等腰三角形。
The mandibular and mandibular alveolar arch triangles were measured on the lower extremities (male 117, female 28) from 145 Chinese adults unearthed in Changchun. The results showed that the length of the triangle between the three sides of the same individual and the size of the triangle The differences were highly significant, P <0.01. The differences in the corresponding side lengths of male and female triangle are also quite significant.According to the q-test, the mandibular and mandibular alveolar triangle of the mandible of Chinese adults unearthed in Changchun is an isosceles triangle.