The maxillary processes extend in a cephalad direction form the piriform aperture to the lacrimal crest, uniting with the frontal and nasal bones.
上颌骨额突由梨状孔和泪嵴向头侧方向伸出，与额骨和鼻骨相接。
The vomer itself rests on the maxillary and palatine crest.
犁骨位于上颌骨及腭嵴之上。
Conclusions: 1 the stress is concentrated in alveolar bone crest and apex area of the maxillary anterior teeth while they are in tipping movement.
结论：1倾斜移动内收上颌组牙时，各个牙的牙槽嵴顶部和根尖部都有明显的应力集中区域。
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