Fig. 2

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Different situations and aspects of the mandibular canal: Subclasses. (1) The mandibular canal is distant more than 1.5 mm from the roots. (2) The mandibular canal is distant less than 1.5 mm from the roots with the total presence of its cortical lining. (3) The mandibular canal is distant less than 1.5 mm from the roots with total or partial loss of its cortical lining with preserved calibre. (4) Direct contact with a reduced calibre of the mandibular canal.
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