Panoramic radiography was compared with conventional tomography as techniques for visualizing the mandibular canal. Tomography gave a significantly clearer image of the canal at and 1 cm posterior to the mental foramen, while no differences were found between the methods 2 cm posterior to the mental foramen. Thus, tomography could be of great value in locating the mandibular canal before implant surgery in edentulous mandibular posterior segments.
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