根管弯曲度对电子根尖定位仪测量准确性的影响  

The effect of curvatures on the accuracy of the electronic apex locator

作　　者：田啊林 黎小川 陆雨桐 叶晶晶[1] 刘燕[1] 何俐[2] 

机构地区：[1]湖北医药学院15腔学院2009级本科 [2]湖北医药学院口腔学院附属人民医院口腔医学中心,湖北十堰442000

出　　处：《上海口腔医学》2014年第6期685-688,共4页Shanghai Journal of Stomatology

基　　金：湖北医药学院国家级大学生创新创业训练计划(201210929013)~~

摘　　要：目的 :研究不同弯曲度的根管对Raypex5、PropexⅡ和Rider3种电子根尖定位仪(electronic apex locator,EAL)测量准确性的影响。方法:采用藻酸盐和离体牙构建EAL体外模型,使用Raypex5、PropexⅡ和Rider3种EAL,对123个根管进行根管长度测量,记录测量工作长度值(experimental measurements,EM)及与理论工作长度值(ideal measurements,IAM)之间的差值(IF值)。采用SPSS11.5软件包对数据进行统计学分析。结果:以IAM值±0.5 mm为衡量标准,计算EAL测量直根管、中度和重度弯曲根管的准确率,Raypex5分别为84.6%、81.6%、87.5%,PropexⅡ分别为76.9%、89.8%、91.7%,Rider分别为92.3%、89.8%、87.5%。经检验,各组间IF值无差异显著。结论:根管的弯曲度对根尖定位仪的测量准确性无显著影响,但根管弯曲度不同,不同EAL测量的准确率略有差异。PURPOSE： To investigate the effect of canal curvatures on the accuracy of 3 electronic apex locators （EAL） in vitro. METHODS： Alginate and 123 canals were used to mimic the situation in vitro. Three kinds of electronic apex locators including Raypex5 , Propex Ⅱ and Rider were applied to determine the length of the canals divided into 3 groups including straight （〈5°）, middle （〉10°, 〈20°） and severe （〉20°）according to the root canal curvatures. Experimental measurements and the distances （IF value） between experimental and ideal actual measurements under the same measurement environment were recorded. Paired sample t test was applied to analyze the results by using SPSSll.5 software package. RESULTS： The results showed that with the allowance of ±0.5 ram, the accuracy ratios of straight canal, moderate and severe curvature canal were 84.6%, 81.6%, 87.5% for Raypex 5,76.9%,89.8%, 91.7% for Propex Ⅱ, and 92.3%, 89.8%, 87.5% for Rider, respectively. There was no significant difference in the accuracy between the EALs regarding three degrees of root canal curvatures. CONCLUSIONS： The curvatures of the root canals have no influence on the accuracy of the EALs, though the difference exists in the accuracy rate among the EALs.

关 键 词：电子根尖定位仪 弯曲根管 工作长度 

分 类 号：R781.05[医药卫生—口腔医学]