Background: Identifying accurate data about the bony orbit features according to age, sex, and symmetry is crucial for the effective treatment of orbital pathologies. Purpose: To analyze changes in the dimensions of the orbital aperture and volume of the bony orbit according to age and sex, and to evaluate individual symmetry using 3D computed tomography scans. Material and Methods: We retrospectively analyzed the data obtained from 150 Turkish adults (75 men, 75 women) without an orbital pathology. The study sample was categorized into three age groups: 20–39, 40–59, and ≥60 years. We used the 3DSlicer and Syngo software to measure bony orbital volume (BOV) and the dimensions of the orbital aperture. Results: The BOV showed no difference between the left and right orbit for each individual, while orbital height and width were significantly different between the two sides ( P < 0.05). The mean BOV for both orbits was significantly higher in the ≥60-year age group compared to the 20–39-year age group ( P < 0.05). In all age categories, men exhibited a larger BOV than women ( P < 0.001). There were no significant differences in BOV across age groups for either sex ( P > 0.05). However, the direct effect of age on BOV was found to be significant only in women (p < 0.05) Conclusion: Our findings indicate a significant relationship between aging and BOV, particularly in women, and individual asymmetry in orbital height and width parameters. These results provide accurate normative data for the diagnosis and treatment of orbital pathologies.

Background/Objective: This study aimed to determine the position of the mylohyoid ridge (MR) and lingual concavity (LC) in the mandible and their relationship with the mandibular canal (MC) and submandibular fossa, to provide anatomical guidance for surgical procedures in this region. Methods: A retrospective analysis was performed on cone beam computed tomography (CBCT) scans from 200 adult patients who had undergone imaging for dental treatment. On cross-sectional images at the level between the first and second molar roots, the following measurements were obtained: LC horizontal depth, LC height, LC depth, MR height, MR depth, and the distances from MR to MC (MR–MC) and LC to MC (LC–MC). Results: Mean values were: LC horizontal depth: 3.72 ± 0.90 mm, LC height: 11.74 ± 2.01 mm, LC depth: 12.54 ± 3.03 mm, MR height: 17.66 ± 2.60 mm, MR depth: 6.87 ± 2.38 mm, MR-MC: 8.30 ± 2.00 mm, and LC-MC: 3.72 ± 0.87 mm. All parameters were symmetrical between the right and left sides of the mandible, with no significant sex differences. The positions of the MR and LC were related to each other, and the position of the MC was related to the positions of the LC and MR. There was no correlation between the horizontal depth of the LC and the position of the MR, LC and MC. Conclusions: The vertical positions of the MR and LC are related to each other and MC. Therefore, it can be used as a landmark in implant surgery.