齿根尖切除就是要将受到感染的根梢的一个非常小的部分切除掉。
Apicoectomy is the removal of a very small Part of the infected root tip.
结果根管治疗失败的主要原因为根管继发感染、根尖超填及根尖周机械损伤。
Results Secondary infection of the root tubes , apex overfilled and peripheral mechanical injury were main failure factors in the treatment of root tubes .
目的：了解感染根管内产黑色素类杆菌（BPB）的定植情况，进一步探讨BPB与慢性根尖周炎临床症状的相关性。
OBJECTIVE To study the colonization of Black-pigmented bacteria(BPB)in infected root canals and discuss the correlation between Black-pigmented bacteria and clinical symptoms in chronic periodontitis.
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