![]() ![]() ![]() There is no individual modality that completely satisfies all requirements of working length determination.Ĭone-beam computed tomographic (CBCT) image is a contemporary radiographic imaging system and overcomes several shortcomings encountered with traditional radiographic modalities. Although the EAL overcomes the radiograph in reliability and accuracy, its performance might be falsified by several circumstances such as lack of patency, electric conductivity of restoration, or complexities in anatomical configuration. Īfter the unsuccess of early few generations of electronic apex locator (EAL), the major shortcomings of these EALs are overcome by the contemporary EALs with the coming out of “multiple frequencies” or “ratio method”. However, this analogue or digital film has certain shortcomings, leading to misinterpret the actual situation, identify root apex incorrectly, distort image, and overestimate WL. Periapical (PA) radiograph has been the most conventional modality for reliable and standard WL determination in many dental schools in the world. The apical constriction is the ideal and practical point where the root canal procedure should be terminated, although this anatomic landmark does not exist in every case. An appropriate WL is utmost important in keeping the preparation inside restricted radicular space, prohibiting apical extrusion and securing good obturation. One of the most important phases in endodontic therapy is the root canal instrumentation, which is basically established on the working length (WL) determination. The correct working length after adjustment from the semi-automatically length by the 3D Endo software and Romexis Viewer measurements agreed with the AL. The accuracy in the range of ± 0.5 mm of the EAL ProPex II was highest among the experimental modalities, however this method disagreed with the actual length. ![]() Fisher’s exact test, paired t-test, Bland-Altman plot were used to test the differences among the experimental modalities in working length determination at the significance of 0.05. Mean differences between the four methods with the AL were calculated and compared. It measured root canal lengths using the CBCT (Romexis Viewer), 3D Endo for proposed length (3D-PL) and correct length (3D-CL). Teeth were then scanned using CBCT device at voxel size of 0.10 mm. Access cavity was performed, and root canal lengths were measured with a digital caliper for actual length (AL) and EAL for electronic length. Methodsģ02 root canals in 111 human extracted molars were chosen. The objective of this study is to investigate the accuracy of the 3D Endo software, cone-beam computed tomography (CBCT) software, and the electronic apex locator (EAL) in endodontic length determination. ![]()
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