Analysis of Mandibular Structure Using 3D Facial Computed Tomography

Objective This study measured and analyzed the position and dimension of genial tubercle (GT) and mental foramen (MF) Study Design Retrospective chart review study. Setting Tertiary care teaching hospital. Subjects and Methods Two hundred ten subjects were included who received 3‐dimensional (3D) facial computed tomography (CT), and the GT and MF were evaluated. Subjects were divided into 4 groups by gender and skeletal type. Seven variables were measured: (1) height of GT (GTH), (2) width of GT (GTW), (3) distance from apices of lower incisors to superior border of GT (LI‐SGT), (4) distance from inferior border of GT to inferior border of mandible (IGT‐IBM), (5) thickness of anterior mandible (MT), (6) distance from symphysis of mandible to MF (S‐MF), and (7) distance from superior border of GT to inferior border of mandible (SGT‐IBM). Results All the parameters showed marked differences in individuals. Class I males showed longer GTH, MT, and SGT‐IBM than class I females ( P <. 05). IGT‐IBM and S‐MF were longer in class II males than in class I females ( P <. 05). LI‐SGT and IGT‐IBM also showed personal variation. Conclusion Anatomical features of mandibular structures showed individual variations. GTH, IGT‐IBM, MT, S‐MF, and SGT‐IBM also showed differences between the groups.