The gauging tools included in the software are helpful in the determination of intra- and intercanal distances and exact measurements of root canal length 8. There are many advantages obtained from CBCT data, including exact dimensions and three-dimensional visualisation, the enhanced observation of roots and/or surrounding landmarks and the detection of peri-radicular pathology, including root resorption or root fractures 6. Although modern EAL performance might be considerably affected by certain conditions, such as the electric conductivity of metal, lack of canal patency, or complexities in anatomical structure 5, it has outstanding advantages over periapical radiograph and in certain circumstances, the latter would seem to be dispensable 3.Ĭone-beam computed tomography (CBCT) has gradually become a more popular modality in endodontic treatment 6 however, by following the ALARA principle, the patient would not benefit from high radiation exposure 3, 7. ‘Multiple frequencies’ or the ‘ratio method’ is the dominant technique used by the contemporary electronic apex locator (EAL), after several technologies were unsuccessfully developed 4. Locating the endpoint of the root canal space or apical constriction has never been easier than with the clinical modalities that are commonly used today 3. Regardless of the existence or absence of this inconsistent feature, effort should be incessantly pursued to confine endodontic therapy to within the root canal limits. Although apical constriction is the ideal and practical point where the root canal procedure should end, this anatomical landmark does not exist in every case 2. An appropriate WL is of utmost importance in keeping the preparation inside the restricted radicular space, in order to avoid apical extrusion and secure good obturation 1. The EAL was an accurate and reliable method for root canal length measurement.Įndodontic working length (WL), which is established on the root canal length, is one of the most important parameters in endodontic preparation 1. CBCT at the smallest slice thickness estimation was not the best modality in agreement with the AL. There was an agreement between the EL and CBCT at a slice thickness of 1.2 mm ( p = 0.349). The accuracy in the range of ± 0.5 mm was 100% for the EAL. Data were tested using paired t-tests and Bland–Altman plots to detect the differences between the methods in length estimation at a significance of 0.05. The endodontic access cavities were created, and root canal lengths were estimated with an EAL for electronic length (EL) and a ruler for AL. Root canal lengths were estimated using CBCT software at different slice thicknesses (0.6, 1.2, and 2.4 mm) and dedicated software for proposed or operator lengths. Teeth were scanned using a CBCT device at a voxel size of 0.075 mm. In total, 111 extracted human molars with 302 root canals were chosen. The aim of the present study was to evaluate the agreements between the root canal length estimations using cone-beam computed tomography (CBCT) at different slice thicknesses, dedicated software, or an electronic apex locator (EAL) and the actual lengths (AL).
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