（二） 慢性根尖周炎（Chronic Apical Periodontitis）:多继发于 牙髓炎、牙髓坏死、坏疽，部分是由于急性根尖周炎引流后， 未经根治的结果。
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Patients with acute or chronic apical periodontitis were randomly selected, and their symptoms were recorded before treatment.
随机选择急慢性根尖周炎患者，记录患者用药前各项临床体征。
The result showed that metronidazole paste was effective in treating infected root canals, and ineffective in treating chronic apical periodontitis.
结果表明，甲硝唑糊剂可以作为一种根管充填剂使用。
Objective: To investigate the effect of single-visit root canal treatment (RCT) on teeth with chronic apical periodontitis using contemporary technique of canal cleaning, shaping and obturation.
目的：评价慢性根尖周炎一次性根管治疗的临床效果和可靠性。
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