超声冲洗功率和时间对清除感染根管内毒素作用的影响

目的 探讨超声冲洗功率、时间对清除感染根管内毒素的作用的影响。方法 选择20颗患慢性根尖周炎的单根管前牙,随机分为根管治疗范围最小功率组和最大功率组,分别于治疗前、常规根管预备后附加超声冲洗1 min和延长超声冲洗1 min后根管内取样,测量内毒素含量的变化。结果 2组根管治疗前的内毒素含量无显著差异(P>0.05),2组经超声冲洗后的内毒素含量也无明显差异(P>0.05)。但每组的治疗前、超声冲洗1 min后、延长超声冲洗1 min后的内毒素含量两两比较均有显著差异(P<0.05)。结论 一定范围内的超声冲洗功率对清除感染根管内毒素作用无明显影响,适当延长超声冲洗时间可加强感染根管内毒素的清除作用。

Impact of power and time of ultrasonic irrigation on eliminating endotoxin in the infected root canals

Objective To develop the impact of different power and time of ultrasonic irrigation on eliminating of endotoxin in the infected root canals.Methods Twenty maxillary anterior single root canal teeth diagnoged as chronic periapical periodontitis were chosen,they were randomly divided into the minimum power group and the maximum power group,and then the teeth were irrigated ultrasonically for 1 min and 1 min again respectively after routine root canal preparation.The specimens collected from root canal before...