Methods Dual energy X-ray absorptiometry was used to measure the densi ties of lumbar v ertebrae and left mandible angle of all subjects.

• 方法采用双能X线吸收法测量全部研究对象的腰椎与左下颌角的骨密度,在同性别组内对比骨质疏松症组与正常组的下颌角骨密度的差别。