Fig. 2From: Three-dimensional alveolar bone assessment of mandibular molars for immediate implant placement: a virtual implant placement studyClassification of the cross-sectional morphology of the mandible: a convergent type, b parallel type, c undercut type; classification of the anatomic morphology of the inter-radicular septum: d mesial type, e septal type, f septal–mesial typeBack to article page