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Correlation of darkening of impacted mandibular third molar root on digital panoramic images with cone beam computed tomography findings

W Tantanapornkul*,1,2, K Okochi1, A Bhakdinaronk2, N Ohbayashi1 and T Kurabayashi1

1Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan; 2Department of Oral Diagnosis, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand


Figure 1
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  		Figure 1 (a,b) 27-year-old woman with impacted third molar of the left mandible. (a) Darkening of mesial root was found on panoramic image. (b) On cross-sectional cone beam CT image, the thinning of the lingual cortex by the root and the mandibular canal (arrow) were clearly seen. (c,d) 51-year-old man with impacted third molar of the left mandible. (c) Root darkening was present on the panoramic image. (d) Perforation of the lingual cortex by the roots was found on cone beam CT image (arrow). In both cases, there was no grooving of the root

 

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  		Figure 2 (a,b) 30-year-old woman with impacted third molar of the right mandible. Even though darkening of the third molar root was not found on (a) panoramic image, (b) cone beam CT image showed grooving of the roots (arrow)

 

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  		Figure 3 (a,b) 26-year-old man with impacted third molar of the right mandible. Although (a) the panoramic finding that indicates the close relationship between the third molar root and the mandibular canal was found, only (b) lingual cortex perforation (arrow) was found on cone beam CT image without direct contact between the root and the mandibular canal

 




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