面中1/3骨的结构随着颅骨对咀嚼力的力学适应性变化而有所发展。下颌骨咀嚼肌产生的200Psi 的碾碎力设一个坚实的垂直方向的骨性支柱系统吸收后传到颅底。这些支柱包括成对的鼻上颌支柱、颧上颌支柱、翼上颌支柱和一个单独而薄弱的位于中线的筛骨—犁骨支柱。其中颧上颌支柱起于第一磨牙区,承担着最大 The structure of 1/3 of the bones in the face develops with the mechanical adaptation of the skull to the masticatory force. The 200 Psi crushing force generated by the mandibular masticatory muscle is set up by a solid, vertical bone osseous system that is absorbed and transmitted to the base of the skull. These pillars include paired nasal maxillary struts, zygomatic maxillary struts, wing maxillary struts, and a separate, weak midline ethmoid-vault strut. One zygomatic maxillary strut from the first molar area, bear the largest