Tian A-Lin, Li Xiao-Chuan, Lu Yu-Tong, Ye Jing-Jing, Liu Yan, He Li
Grade 2009 Undergraduate, School of Stomatology, People's Hospital, Hubei University of Medicine. Shiyan 442000, Hubei Province, China.E-mail:
Shanghai Kou Qiang Yi Xue. 2014 Dec;23(6):685-8.
To investigate the effect of canal curvatures on the accuracy of 3 electronic apex locators (EAL) in vitro.
Alginate and 123 canals were used to mimic the situation in vitro. Three kinds of electronic apex locators including Raypex5(®), Propex(®) 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 SPSS11.5 software package.
The results showed that with the allowance of ±0.5 mm, the accuracy ratios of straight canal, moderate and severe curvature canal were 84.6%, 81.6%, 87.5% for Raypex5(®) 76.9%,89.8%, 91.7% for Propex(®), 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.
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.
研究根管弯曲度对3种电子根尖定位仪（EAL）体外测量准确性的影响。
采用藻酸盐和123个根管模拟体外情况。应用3种电子根尖定位仪，即Raypex5（®）、Propex（®）和Rider（®），根据根管弯曲度将根管分为3组：直根管（<5°）、中度弯曲根管（>10°，<20°）和重度弯曲根管（>20°），测定根管长度。记录实验测量值以及在相同测量环境下实验测量值与理想实际测量值之间的距离（IF值）。使用SPSS11.5软件包应用配对样本t检验分析结果。
结果显示，在允许误差±0.5 mm的情况下，Raypex5（®）在直根管、中度弯曲根管和重度弯曲根管中的准确率分别为84.6%、81.6%、87.5%；Propex（®）分别为76.9%、89.8%、91.7%；Rider（®）分别为92.3%、89.8%、87.5%。3种电子根尖定位仪在3种不同弯曲度根管中的测量准确性差异无统计学意义。
根管弯曲度对电子根尖定位仪的准确性无影响，尽管不同电子根尖定位仪的准确率存在差异。
