患者,男,66岁。8|慢性牙髓炎曾在他院治疗7月余,仍未治愈,近日夜间疼痛明显加重,来我院就诊。他院病历记载:8|曾失活,拔髓,根备,压封数次,ＣＰ开放数次,仍无缓解。口腔检查:8|牙合面已开扩,有ＣＰ捻③开放,3根管十分通畅,根备达25～30#,Ｘ线片显示,根尖无明显病灶,无超扩现象。 Patient, male, 66 years old. 8 | Chronic pulpitis has been treated in his hospital for more than 7 months, still untreated, pain was aggravated recently at night, came to our hospital. His hospital records record: 8 | had deactivated, puller, root preparation, pressure seal several times, CP open several times, still no relief. Oral examination: 8 | Occlusal surface has been expanded, with CP twist ③ open, the three tubes are very smooth, the root reaches up to 25 ~ 30 #, X-ray film showed no obvious apical lesions, no phenomenon of over-expansion.