慢性牙髓炎，是临床上最为常见的一型牙髓炎。由于龋病等大多是慢性病变，对牙髓有长期持续的刺激，可使牙髓发生慢性炎症的过程。在慢性牙髓炎发展过程中，如多形核白细胞增多，则释放的溶酶体酶也增多，而使炎症加剧，临床上即可出现急性发作的症状。 慢性牙髓炎临床上分为三类：慢性闭锁性牙髓炎，慢性开放性牙髓炎及慢性增生性牙髓炎。慢性开放性牙髓炎又叫作慢性溃疡牙髓炎。慢性增生性牙髓炎又称牙髓息肉。
干髓术主要被用于急或慢性牙髓炎，尤其是活髓磨牙的牙髓病治疗；
PM was primarily applied to the teeth suffering from acute or chronic pulpitis , especially molars with vital pulp.
目的探讨一次性根管充填治疗慢性牙髓炎、根尖周炎的方法和效果。
Objective To discuss the method and effect of one-time root canal filling in treating chronic pulpitis and chronic periapical periodontitis.
结果：77.8%的冠髓组织有不同程度的慢性炎症和慢性牙髓炎急性发作。
Results: Coronal pulp tissue of 77.8% of deciduous teeth with deep caries showed chronic inflammation to various degree or chronic pulpitis with acute attack.
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