根尖孔直径对Root ZX和Neosono Ultima EZ测量准确性的影响

The influence of diameters of root canal foramen on the accuracy of Root ZX and Neosono Ultima EZ

目的:研究根尖孔直径对两种根管长度电测仪Root ZX和Neosono Ultima EZ测量准确性的影响。方法:采用琼脂凝胶模型和毛细玻璃管模拟体内根管,以15#不锈钢K锉为测量电极,在两种不同测量环境下(干燥或2.5%NaClO)使用Root ZX和Neosono Ultima EZ下测量毛细玻璃管的长度,记录测量值与实际值之间的差值(IF值)。结果采用相关分析。结果:Root ZX的IF值在干燥条件下与玻璃管直径无相关,而在有电解质的条件下(2.5%NaClO)随玻璃管直径增大而增大(P<0.05),Neosono Ultima EZ的IF值在不同测试条件下都与玻璃管直径无相关。结论:Root ZX的准确性在有电解质存在的条件下与根尖孔的直径呈负相关,而Neosono Ultima EZ的测量准确性在有无电解质条件下都不受根尖孔直径的影响。

Objective：To investigate the effect of diameter of root canal foramen on the accuracy of two apex locators. Method： Use the agar model and glass capillaries to mimic root canals in vivo. Record the distance between measured length and the real length of the capillaries as the IF value by using a No. 15 stainless steel K file, Root ZX and Neosono Ultima EZ under two measuring environments （dry and 2.5% NaClO）. All the data were subject to correlation analysis. Result：The IF values of Root ZX had no relation to the diameters of capillaries when the capillaries were dry, but had positive proportion to the diameters of capillaries （r〉0, P〈0.05） with the capillaries full of 2.5 % NaClO solution. The IF values of Neosono Ultima EZ had no relation to the diameters of capillaries under both measuring enviroments. Conclusion： The accuracy of Root ZX is reverse to the diameter of root canal foramen with electrolytes in the root canal. The accuracy of Neosono Ultima EZ is not impacted by the diameter of root canal foramen under various measuring enviroments.