慢性根尖周炎治疗多采用根管治疗术达到治疗目的。但根管治疗后几小时到几天内患者出现疼痛或肿胀，或二者均出现称之为约诊间痛或根管治疗中的急性发作。国外学者报道的发生率为１１％～４０％，国内虽此方面报道较少，但临床较为多见，尤其见于牙髓坏死，化脓或根尖阴影... Chronic apical periodontitis treatment with root canal therapy to achieve the purpose of treatment. However, patients experience pain or swelling within hours to days after root canal treatment, or both appear to be referred to as clinically painful or acute episodes of endodontic treatment. The incidence of foreign scholars reported 11% ~ 40%, although less reported in this area, but the clinical more common, especially in pulp necrosis, suppurative or apical shadow ...