The apical leakage is one of the most frequently come across reasons that lead to the endodontic surgery failure after retrograde filling.

根尖倒充填术后根尖发生微渗漏是导致根尖手术失败常见的原因之一。

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AIM:To observe the clinical effect of endodontic surgery. METHODS: 10 cases were reacted badly to or couldn't be treated by routine root canal therapy.

目的：通过根管外科手术，治疗一些常规根管治疗疗效不佳，根管内有不能取出的充填物而不能进行常规根管治疗的患牙。

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