不同冲洗技术去除模拟牙内吸收窝洞中氢氧化钙糊剂效果的体外研究

目的：评估不同冲洗技术去除模拟牙内吸收窝洞内氢氧化钙糊剂的效果。方法：收集110颗单根离体牙， ProTaper预备至F3。将牙根纵向劈成两半，制备标准化的模拟牙内吸收窝洞后将两半牙根复位。5颗牙齿作为阴性对照组，不向根管内导入氢氧化钙糊剂。105颗牙齿导入氢氧化钙糊剂，其中5颗作为阳性对照组不去除根管中的氢氧化钙糊剂，其余100颗牙齿根据使用的不同冲洗技术随机分成5组（n＝20）：常规冲洗针头冲洗组、主尖锉清理组、根管刷刷洗组、超声荡洗组、音波震荡组。体式显微镜下观察使用5种不同冲洗技术去除模拟牙内吸收窝洞后氢氧化钙糊剂剩余的量，使用van der Sluis 4级评分系统进行评分，Kruskal－Wallis检验以及Mann－Whitney检验（P＜0．05）对数据进行统计分析。结果：超声荡洗组、音波震荡组较其他组模拟牙内吸收窝洞内氢氧化钙糊剂剩余的量较少（P＜0．05）。超声荡洗组与音波震荡组间无明显统计学差异（P＞0．05）。常规冲洗针头冲洗组、主尖锉清理组和根管刷刷洗组间无明显统计学差异（P＞0．05）。结论：超声荡洗和音波震荡去除模拟牙内吸收窝洞内氢氧化钙糊剂效果较好。

Effect of different irrigation techniques on the removal of calcium hydroxide paste from an artificial root canal cavity of internal root resorption:an in vitro study

Objective:To evaluate the efficacy of different irrigation techniques to remove calcium hydroxide(CH) from a simulated internal root resorption cavity. Method:110 clinically extracted teeth with single root were collected and prepared using the ProTaper system to size F3.The roots were split longitudinally,standardized simulated internal root re-sorption cavities were prepared in the two root halves,and the root halves were reassembled. The root canals of 5 teeth that were not filled with CH served as the negative control group. The root canals of 105 teeth were filled with CH,5 of them were not subjected to the CH removal procedure,antoher 100 teeth were randomly divided into 5 experimental groups (n=20),according to the irrigation techniques used:conventional syringe irrigation group,main file cleaning group,canal brush group,passive ultrasonic irrigation group,sonic vibration group. The amount of remaining CH was evaluated under a ste-re-omicroscope,using van der Sluis 4-grade scoring system. The data were statistically comparedusing the Kruskal-Wallis and Mann-Whitney tests (P <0.05). Result:Remnants of CH in simulated internal root resorption cavities of passive ultrasonic irrigation group and sonic vibration group were less than other groups(P<0.05). There was no significant difference between passive ultrasonic irrigation group and sonic vibration group (P >0.05). There were also no significant differences between conventional syringe irrigation group,main file cleaning group and canal brush group(P>0.05). Conclusion:The passive ul-trasonic irrigation and sonic vibration techniques were superior to the conventional syringe irrigation,main file cleaning group and canal brush techniques in removing CH from simulated internal root resorption cavity.