METHODS:120 periapical curettage cases were divided into two groups randomly. 65 cases received therapy of the BIO-OSS bone dust implant.

方法：选取120例根尖周刮治术的患者随机分为2组：实验组65例，术后使用B IO-OSS骨粉充填骨腔；

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Bio-Oss is bovine bone from which all the organic material has been extracted, yielding a micro-porous structure very similar to autogenous bone in its chemical composition and microstructure.

Bio - Oss源于牛骨，所有的有机物质已经从中提出，在化学结构和微型结构上与自体骨的微孔结构非常相似。

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