目的探讨根管治疗困难病例的治疗方法。
Objective to investigate how to increase the therapeutic efficacy of root canal treatment for complex cases.
此病起病隐匿，诊断时往往已是晚期，治疗困难。
Because of its insidious onset, the diagnosis of this disease was usually delayed rendening treatment difficult.
糖尿病并骨质疏松症病机复杂，治疗困难，保健费用大。
Diabetes combine osteoporosis of pathogenesis complications, treatment difficulty, health care expenses great.
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