Objective to investigate the displacements and the stress distributions of a mandibular second molar 摘要目的?解下颌第二恒磨牙不同载荷下近中移动时的位移及应力分布情况。
2.
Excessive mesial - axial inclination of the mandibular second molar or inadequate posterior arch length cause the mandibular second molar to become impacted against the distal contour of the first permanent molar 摘要下颚牙弓空间不足或第二大臼齿本身过度的近心轴向倾斜，常造成第二大臼齿前倾和阻生。
