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[Comparison of the accuracy of measuring root canal working length in 3 different ways]
1Department of General Dentistry, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; Shanghai Key Laboratory of Stomatology; Shanghai Research Institute of Stomatology; National Clinical Research Center of Stomatology. Shanghai 200011, China.
Purpose:
To compare the accuracy of measuring root canal working length with two different electronic apex locators and digital X-ray.
Methods:
Ninety patients treated from January 2015 to June 2016 were selected, 232 root canals in total were randomly divided into 3 groups: X-ray group, Raypex5 group and i-root group. The accuracy of working length measured was assessed according to the filling quality of related main tips. The data were analyzed with SPSS19.0 software package for Chi-square test.
Results:
The success rates for root canal filling of X-ray group, Raypex5 group and i-root group were 88.5%, 92.9% and 96.1% respectively with no significant difference between 3 groups (P>0.05). The success rates for root canal filling of molar teeth, premolar teeth and front teeth were 92.5%, 96.6% and 95.2% respectively with no significant difference between the 3 groups (P>0.05).
Conclusions:
The clinical effect of Raypex 5 and i-root electronic apex locators for working length measuring is similar to that of conventional X-ray, but the use of electronic apex locators can avoid unnecessary ionizing radiation and improve clinical efficiency.
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Accuracy is defined as the closeness of the measured value to the true or actual value. In engineering mechanics, repeated measurements are taken during theoretical or experimental analyses to ensure that the result is precise and accurate.
The accuracy of any solution is based on the...

