牙髓坏死并发根尖周病变的传统治疗是清扫根管坏死腐败组织,作常规根管充填。然而,对多根牙,根管弯曲、堵塞、狭窄及老年退行性变阻塞根管、慢性根尖肉芽肿、儿童乳牙的牙髓坏死并发根周脓肿等病例,常规根管治疗操作困难费时,有时效果亦不满意。 The traditional treatment of pulpal necrosis complicated with periapical lesions is to clean the necrotic tissue of root canal necrosis, as a conventional root canal filling. However, in many cases, the root canal bending, blockage, stenosis and senile degenerative obstruction root canal, chronic apical granuloma, pediatric deciduous teeth with pulp root necrosis and other cases of root abscess, conventional root canal treatment is difficult and time-consuming operation, Sometimes the effect is not satisfied.