the majority of the pain occurred in pulp necrosis, postteeth, teeth with small periapical lesion range and with a history of pre-operative pain within 6 months.

• 1%25）发生了不同程度的根管治疗术后疼痛,其中死髓牙、后牙、根尖阴影小的牙和近期有过疼痛史的牙齿发生疼痛的比例较高。