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目的应用3%Na OCl作为基础冲洗液,17%EDTA作为终末冲洗液,分别配合PUI或EA或侧方开口冲洗针辅助进行根管冲洗30秒或60秒,比较根管玷污层的清除效果。方法将60颗离体牙均在距根尖15mm处截冠。用ISO#10 K-file疏通根管,在K-file尖端刚从根尖孔露出时调整固定参考点,记录止动片到器械尖端的距离,将此距离减去1mm定为工作长度(WL)。根据所用冲洗技术的不同分6组,扫描电镜观察,采用多因素分析的t检验进行数据分析,检验水准设置在a=0.05。所有统计分析均由SAS9.2完成。结果被动超声或Endoactivator辅助Na OCl进行根管冲洗比仅使用侧方开口冲洗针能更有效地去除玷污层。结论本研究表明所有冲洗方案根尖区玷污层清除效果都比较差,均不能完全清除玷污层。
Objective To compare the removal efficiencies of root canal smear with 3% Na OCl as the base irrigation solution and 17% EDTA as the terminal irrigation solution, with PUI or EA or lateral opening irrigation needles for root canal irrigation for 30 seconds or 60 seconds respectively . Methods Sixty isolated teeth were crowned at a distance of 15mm from the root tip. The root canal was dredged with ISO # 10 K-file and the fixed reference point was adjusted as soon as the tip of the K-file was exposed from the apical foramina. The distance from the stop to the tip of the instrument was recorded. The distance minus 1mm was defined as the working length (WL ). According to the different rinse technology used in 6 groups, scanning electron microscopy, multivariate analysis using t test data analysis, the test level set at a = 0.05. All statistical analysis by SAS9.2 completed. Results Passive sonography or Endoactivator assisted Na OCl for root canal irrigation was more effective than smeared layer only using lateral open-ended irrigation needles. Conclusions This study shows that the removal of smeared layers in the apex area of all irrigation protocols is relatively poor and does not completely remove the smear layer.