病理性骨折是晚期下颌骨萎缩的严重并发症,它可能由于系统性疾病引起如骨质疏松症、软骨病、肾性骨发育不全,也可由局部因素引起如外伤、植入的骨内种植体、修复体的异常压力等。 重建萎缩的无牙下颌骨有许多方法。要恢复足够的牙槽嵴高度和外形,可选择的方法有:中厚皮片移植的前庭沟成形术、口底降低术、种植体支持的义齿、用 Pathological fractures are serious complications of late mandibular atrophy, which may be caused by systemic diseases such as osteoporosis, osteomalacia, renal osteodystrophy, and may also be caused by local factors such as trauma, implanted intraosseous implants , Abnormal pressure on prosthesis and so on. There are many ways to rebuild a shrinking toothless mandible. To restore adequate alveolar ridge height and shape, the options are: medium skin grafts vestibular dissection, reduction of floor surgery, dental prosthesis support, with