A = Position of the mandibular foramen to specific points of the ramus in a non-atrophic mandible; B = Average decrease of the measurements in an atrophic mandible; C = Representation of the shape of the foramen in both groups and average decrease of its area.
AM = anterior margin of the ramus; IM = inferior margin of the ramus; MF = mandibular foramen; PM = posterior margin of the ramus; SM = superior margin of the ramus.