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牙髓坏死、尖周骨质破坏与根管内细菌有直接关系。作者选择因龋坏导致恒牙死髓患者601例,其中21.4％男性,19.5％女性患有系统性疾病,如高血压、
Pulp necrosis, periapical bone destruction and bacteria in the root canal have a direct relationship. The author chose 601 cases of dead teeth due to decay in permanent teeth, of which 21.4% males and 19.5% females had systemic diseases such as hypertension,