hypodontia

Objective:To investigate the relationship among the congenital hypodontia of mandibular incisor and malocclusion and the variation of medial distal dimension of mandibular canine.

探讨下颌恒切牙先天缺失情况,与牙颌畸形的关系以及下尖牙径的变化。

So this fetus presented seeral signs of trisomy 21, including the hypoplasia of the nasal bone, hypodontia, micrognathia, and hypospadias.

这样，本例胎儿示21三体的若干征象：包括育不全、牙育不全、小颌和尿道下裂。