Imaging Sci Dent.  2015 Sep;45(3):153-158. 10.5624/isd.2015.45.3.153.

Accuracy of digital periapical radiography and cone-beam computed tomography in detecting external root resorption

• Creanga AG
• Geha H
• Sankar V
• Teixeira F
• McMahan CA
• Noujeim M

• KMID: 2045022
• DOI: http://doi.org/10.5624/isd.2015.45.3.153

Abstract

PURPOSE
The purpose of this study was to evaluate and compare the efficacy of cone-beam computed tomography (CBCT) and digital intraoral radiography in diagnosing simulated small external root resorption cavities.
MATERIALS AND METHODS
Cavities were drilled in 159 roots using a small spherical bur at different root levels and on all surfaces. The teeth were imaged both with intraoral digital radiography using image plates and with CBCT. Two sets of intraoral images were acquired per tooth: orthogonal (PA) which was the conventional periapical radiograph and mesioangulated (SET). Four readers were asked to rate their confidence level in detecting and locating the lesions. Receiver operating characteristic (ROC) analysis was performed to assess the accuracy of each modality in detecting the presence of lesions, the affected surface, and the affected level. Analysis of variation was used to compare the results and kappa analysis was used to evaluate interobserver agreement.
RESULTS
A significant difference in the area under the ROC curves was found among the three modalities (P=0.0002), with CBCT (0.81) having a significantly higher value than PA (0.71) or SET (0.71). PA was slightly more accurate than SET, but the difference was not statistically significant. CBCT was also superior in locating the affected surface and level.
CONCLUSION
CBCT has already proven its superiority in detecting multiple dental conditions, and this study shows it to likewise be superior in detecting and locating incipient external root resorption.

Keyword

Root Resorption; Cone-Beam Computed Tomography; Dental Digital Radiography

MeSH Terms

Cone-Beam Computed Tomography*
Radiographic Image Enhancement
Radiography*
Radiography, Dental, Digital
ROC Curve
Root Resorption*
Tooth

Figure

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  Fig. 1 A photograph shows the use of soft tissue simulation in acquiring intraoral radiographs.

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  Fig. 2 Orthogonal periapical radiograph (PA) is seen.

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  Fig. 3 A set of orthogonal (PA, left) and corresponding mesioangulated projection (SET, right) are taken.

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  Fig. 4 Planmeca Romexis Viewer Software shows axial, coronal, sagittal, and three-dimensional CBCT images of simulated external root resorption (arrows).

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  Fig. 5 Receiver operating characteristic (ROC) curves for all modalities of PA, SET, and CBCT images.

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