Materials and Methods: The 40 moloar teeth without alveolysis within one week, were tied with steel wire, treated with root cannel filling or resinifying therapy.

• 方法：40例患牙折裂后1周内就诊无牙周及根尖周疾病的磨牙，以钢丝结扎患牙，并进行根管充填术或塑化术。