Digora及Propex测量根管工作长度准确性的比较研究

目的：评价数字化牙片系统Digora及电子根尖定位仪Propex测量根管工作长度的准确性，为临床应用提供参考依据。方法???选取临床中需拔牙的90例患者260颗患牙（369个牙根）为研究对象，首先对患牙拍摄数字化牙片，利用Digora系统中的长度工具测量牙片上牙齿根管长度，然后对患牙开髓，电子根尖定位仪Propex测量根管工作长度，最后拔除患牙直视下测量根管实际长度并以此长度为标准，计算Digora牙片测量法、Propex电测法与实际根管长度的差值，分别以1、1.5?mm误差评定两法测量根管工作长度的准确性。结果???牙片法测量值与拔牙实测值差值为（2.163±1.194）mm，电测法测量值与拔牙实测值差值为（0.214±0.542）mm。以1?mm内为可接受范围，牙片法准确率为21.68%，电测法为91.87%；若以1.5?mm以内为可接受范围，则两法准确率分别为30.35%、95.66%。牙片法准确率均明显低于电测法（P<0.01）。结论??采用Digora系统长度工具直接测量牙片上根管长度时，误差较大，不能直接指导临床操作。Propex能较准确地测量根管工作长度。

Comparison of the accuracy of Digora and Propex on the measurement of working length of root canal

Objective This study aimed to compare the accuracy of the X-ray digital imaging system Digora and the electronic apex locator Propex on the measurement of the working length of root canal. Methods The study comprised 260 teeth(369 roots)that needed to be extracted from 90 patients. Each tooth was radiographed with the Digora system, and the root length was measured in the Digora digital imaging software with the length tool. The teeth were anesthetized and accessed. The working length of the root canal was determined by the apex locator Propex. Finally, the tooth was extracted, and the real length of the root canal was measured directly. The results obtained with Digora and Propex were compared with the real length. Results The difference between the Digora measured length and real length was (2.163±1.194) mm, where as that between the Propex measured length and real length was (0.214±0.542) mm. When a difference of less than 1 mm was acceptable, the measurement accuracy of Digora and Propex was 21.68% and 91.87%, respectively. When a difference of less than 1.5 mm was acceptable, the accuracy of Digora and Propex was 30.35% and 95.66%, respectively. The measurement accuracy of Digora was significantly lower than that of Propex(P<0.01). Conclusion Digora could easily directly evaluate the root canal length, but it could not directly guide clinical operations. Propex could accurately measure the working length of the root canal.