结果不对称畸形上牙弓双侧狭窄；
Results Upper arch is narrower than normal in craniofacial asymmetry.
上牙弓发育较早，但下牙弓发育速度快于上牙弓。
The development of the upper dental arch was earlier, but the down dental arch faster.
方法应用牙连同颌组织连续切片技术，对40例不同胎龄胎儿的上下颌骨作水平方向切片，观测并统计。结果胎儿28周后牙胚拥挤，上牙弓拥挤更显著；
Methods The maxillary and mandible of 40 fetuses (different ages) were cut horizontally with toothwithjaw continual tissue slices technique, observation and statistics.
结论：上、下牙弓宽度不调与牙周病有密切关系。
CONCLUSION: the dis-coordination of the dental arch width in maxilla and mandible has an affinity with periodontal disease.
结论：上、下牙弓宽度不调与牙周病有密切关系。
CONCLUSION: the dis-coordination of the dental arch width in maxilla and mandible has an affinity with periodontal disease.
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