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- Title
Panoramic radiographs underestimate extensions of the anterior loop and mandibular incisive canal.
- Authors
de Brito, Ana Caroline Ramos; Nejaim, Yuri; de Freitas, Deborah Queiroz; de Oliveira Santos, Christiano
- Abstract
Purpose: The purpose of this study was to detect the anterior loop of the mental nerve and the mandibular incisive canal in panoramic radiographs (PAN) and cone-beam computed tomography (CBCT) images, as well as to determine the anterior/mesial extension of these structures in panoramic and cross-sectional reconstructions using PAN and CBCT images. Materials and Methods: Images (both PAN and CBCT) from 90 patients were evaluated by 2 independent observers. Detection of the anterior loop and the incisive canal were compared between PAN and CBCT. The anterior/mesial extension of these structures was compared between PAN and both cross-sectional and panoramic CBCT reconstructions. Results: In CBCT, the anterior loop and the incisive canal were observed in 7.7% and 24.4% of the hemimandibles, respectively. In PAN, the anterior loop and the incisive canal were detected in 15% and 5.5% of cases, respectively. PAN presented more difficulties in the visualization of structures. The anterior/mesial extensions ranged from 0.0 mm to 19.0 mm on CBCT. PAN underestimated the measurements by approximately 2.0 mm. Conclusion: CBCT appears to be a more reliable imaging modality than PAN for preoperative workups of the anterior mandible. Individual variations in the anterior/mesial extensions of the anterior loop of the mental nerve and the mandibular incisive canal mean that is not prudent to rely on a general safe zone for implant placement or bone surgery in the interforaminal region.
- Subjects
COMPUTED tomography; PANORAMIC radiography; TOMOGRAPHY; CROSS-sectional method; RESEARCH methodology
- Publication
Imaging Science in Dentistry, 2016, Vol 46, Issue 3, p159
- ISSN
2233-7822
- Publication type
Article
- DOI
10.5624/isd.2016.46.3.159