Abstract
Background This study aimed to assess the diagnostic accuracy of cone beam computed tomography (CBCT) and quantitatively evaluate the morphology of mandibular first molars using CBCT. Material and Methods Twenty-four double-rooted mandibular first molars were evaluated by NewTom VGi CBCT. The distance from the furcation and apex to the cementoenamel junction (CEJ), diameter and thickness of canal walls, the buccolingual (BL) to mesiodistal (MD) ratio (ΔD), prevalence of oval canals at different sections and taper of the canals were all determined. In order to assess the diagnostic accuracy of CBCT, distance from the furcation and apex to the CEJ and thickness of canal walls at the CEJ and apex were compared with the gold standard values (caliper and stereomicroscope). Statistical analyses were carried out using intraclass correlation coefficient (ICC), paired t-test and repeated measures ANOVA. Results A high correlation existed between the CBCT and gold standard measurements (P<0.001). In dimensional measurements, length of mesial root was higher than the distal root and lingual furcation was farther from the CEJ than the buccal furcation (P<0.001). An important finding of this study was the mesiodistal taper of the mesiobuccal (MB) and mesiolingual (ML) canals; which was equal to 0.02. Conclusions CBCT has acceptable diagnostic accuracy for measurement of canal wall thickness. Cleaning and shaping of the canals should be performed based on the unique anatomy of the respective canal; which necessitates the use of advanced imaging techniques for thorough assessment of root canal anatomy in a clinical setting. Key words:Permanent mandibular first molar, accuracy, cone-beam computed tomography, dimensional measurement.
Highlights
Adequate knowledge about the root canal anatomy is a necessary prerequisite for a successful root canal treatment (RCT) [1]
One tooth was excluded from the study due to having two canals in the distal root. -Validity assessment: intraclass correlation coefficient (ICC) test showed a significant correlation between the cone beam computed tomography (CBCT) and the gold standard measurements (P
The results of this study showed that the ICC for the accuracy of linear measurement of radicular wall thickness was over 0.996, consistent with other studies [7]
Summary
Adequate knowledge about the root canal anatomy is a necessary prerequisite for a successful root canal treatment (RCT) [1]. Many studies have successfully used μ-CT for quantitative and qualitative assessment of the root canal system under in-vitro conditions [4] This imaging modality is time consuming and not accessible for use in the office setting. This study aimed to assess the diagnostic accuracy of CBCT and quantitatively evaluate the morphology of mandibular first molars using CBCT. This study aimed to assess the diagnostic accuracy of cone beam computed tomography (CBCT) and quantitatively evaluate the morphology of mandibular first molars using CBCT. In order to assess the diagnostic accuracy of CBCT, distance from the furcation and apex to the CEJ and thickness of canal walls at the CEJ and apex were compared with the gold standard values (caliper and stereomicroscope). Cleaning and shaping of the canals should be performed based on the unique anatomy of the respective canal; which necessitates the use of advanced imaging techniques for thorough assessment of root canal anatomy in a clinical setting
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