根尖狭窄破坏对PropexⅡ电子根尖定位仪准确性的影响  

Influences of destroyed apical constriction on the accuracy of PropexⅡ electronic apex locator

作　　者：胡玉凤[1] 金文忠[2] HU Yu-feng JIN Wen-zhong(Department of Oral Medicine, Shanghai Stomatological Hospital, Fudan University. Shanghai 200031 Department of Prosthodontics, Shanghai Ninth People＇s Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine. Shanghai 200011, China)

机构地区：[1]上海市口腔医院.复旦大学附属口腔医院口腔内科,上海200031 [2]上海交通大学医学院附属第九人民医院.口腔医学院口腔修复科,上海200011

出　　处：《上海口腔医学》2017年第3期251-253,共3页Shanghai Journal of Stomatology

基　　金：上海市卫生和计划生育委员会青年科研课题资助项目(20134Y029)

摘　　要：目的 :研究在根尖狭窄破坏的情况下,PropexⅡ测量准确性与根尖孔大小的相关性。方法 :磨除40颗单直根管离体牙根尖1 mm,采用2%液态琼脂凝胶注入卡斯特罗模型,使用PropexⅡ电子根尖定位仪进行根管长度测量,记录测量值(LP),计算实际测量的根管工作长度(L)与电测法测量的根管工作长度(LP)的差值(△L)。显微镜下拍摄根尖孔图像,利用Photoshop CS 6.0软件测量根尖孔面积(S)。采用SPSS 22.0软件包对测量结果进行直线相关回归分析。结果:以±0.5 mm作为△L的允许范围,△L均为正值。在根尖狭窄破坏的情况下,PropexⅡ的测量准确率为52.5%。R值为0.903,S与△L呈线性相关。建立的线性回归方程为:S=0.04+0.11×△L。结论:在根尖狭窄破坏的情况下,电子根尖定位仪准确性下降;根尖孔面积越大,准确性越差。PURPOSE： To study the correlation between apical foramen area and accuracy of PropexⅡ electronic apex locator under destroyed apical constriction. METHODS： Forty extracted teeth with single straight root canal were ground down 1 mm in the root tip and placed in 2% liquid agar gel injected into Castro model. The length of root canal was measured by PropexⅡ electronic apex locator. The difference （AL） between the electronic length （LP） and actual length （L） was calculated. Imaging of apical foramen was recorded under microscope and apical foramen area （S） was measured by image processing software Photoshop CS. SPSS 22.0 software package was used to analyze the linear correlation and regression. RESULTS： With ＋0.5 mm as the allowable range, all value of AL was positive. The precise rate of Propex Ⅱ was 52.5% when apical constriction was destroyed. There was a linear relationship between S and AL （S=0.04＋0.11×△L, R=0.903）. CONCLUSIONS： The accuracy decreases when apical constriction is destroyed. The accuracy is worse when the apical foramen area is larger.

关 键 词：电子根尖定位仪 根尖狭窄 根尖孔面积 

分 类 号：R781.05[医药卫生—口腔医学]