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Example of measurement of the shortest linear distances (mm) at the level of the right second premolar. The frontal CBCT image shows the distance from the most buccal (A) and lingual (B) aspects of the canal to the corresponding cortical plates of the mandible, and the minimum linear distance between the inferior aspect of the canal and the inferior border of the mandible (C). The measurement of the thickness of the cortical bone at each point is also illustrated.
