Figure 3.

Each 3D mandibular model obtained from semi-automatic segmentation was superimposed to its ground truth model (manual segmentation) in order to reliably remove alveolar processes and teeth. (A), occlusal plane (OP) constructed by selecting three points, respectively, the mesio-buccal cusp tip of the mandibular first molars and the interproximal point between the two mandibular central incisors; (B,C), the OP was manually translated on the Y-axis (vertical axis) until it reached the apical position of the lowest dento-gingival junction; (D), sagittal view of the defined horizontal cutting plane; (E), construction of a distal cutting plane passing through the tangent line to distal wall of the second mandibular molars; (F), removal of the alveolar process according to the two defined cutting planes.