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CBCT for the assessment of second mesiobuccal ( MB 2) canals in maxillary molar teeth: effect of voxel size and presence of root filling
Author(s) -
Vizzotto M. B.,
Silveira P. F.,
Arús N. A.,
Montagner F.,
Gomes B. P. F. A.,
Silveira H. E. D. da
Publication year - 2013
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12075
Subject(s) - voxel , radiography , cone beam computed tomography , root canal , molar , medicine , orthodontics , dentistry , nuclear medicine , computed tomography , radiology
Abstract Aim To compare detection of the second mesiobuccal ( MB 2) canal in maxillary molar teeth using cone‐beam computed tomography ( CBCT ) with different voxel sizes against conventional radiographic examination when the MB 1 was unprepared, prepared and filled. Methodology Radiographic examination and 0.2‐, 0.25‐ and 0.3‐mm CBCT ( n = 89) were performed in 3 stages: S1, no first mesiobuccal ( MB 1) canal preparation or filling; S2, after MB 1 preparation and filling; and S3, after MB 1 root canal filling removal and canal repreparation. Images were analysed using the i‐Cat software. After RE and CBCT acquisition in S3, all the samples were clarified to directly visualize the presence of the MB 2 canal. All images were analysed by a blinded, previously calibrated examiner. Accuracy, specificity and sensitivity were compared using analysis of variance ( P < 0.05 level of significance). Results MB 2 root canals were detected in 67% of the samples. Overall, radiographic examination was associated with lower mean accuracy values for detecting MB 2 than CBCT regardless of the MB 1 condition. The MB 1 root canal condition did not influence MB 2 detection in 0.2‐mm voxel images. The presence of root fillings in the MB 1 canals reduced the detection of MB 2 canals, especially in the 0.3‐ and 0.25‐mm voxel‐size images ( P < 0.05). Conclusion CBCT was associated with higher mean values of specificity and sensibility than radiographic examination for the detection of MB 2 canals. When endodontic retreatment is necessary removal of the root filling prior to the CBCT examination eliminates artefacts, thereby permitting the use of the 0.3‐mm voxel protocol that has good diagnostic performance and lower radiation dose.