Comparative study of dental measurements from digital models using photogrammetry and desktop scanner

Abstract Aim: This study aimed to compare dental measurements obtained from digital orthodontic models created by photogrammetry and those obtained from a desktop scanner. Materials and methods: Forty orthodontic digital models (20 in each group) were analyzed. Group I consisted of digital models constructed using photogrammetry with a digital single lens reflex camera and 3DF Zephyr software. Group II consisted of digital models obtained using a 3Shape D800 desktop scanner. Dental measurements including crown width, crown length, intermolar width, intercanine width, arch length discrepancy, and Bolton ratios were collected using MeshLab software. Independent t tests were performed to evaluate the significance of the measurement differences between groups. Results: There were no statistically significant differences between the two groups across all measured parameters ( P > 0.05). Photogrammetry consistently showed a slight underestimation in some measurements but remained clinically reliable. Conclusion: Photogrammetry is a reliable, low-cost alternative to desktop scanners for generating digital orthodontic models. Its accuracy is sufficient for clinical use, making it particularly valuable in resource-limited clinics.