Trueness of orthodontic 3D-printed models derived from CBCT and intraoral scans

Results:The IOS group showed significantly lower RMS deviation than the CBCT group, with mean RMS values of 106.20±3.29 µm and 122.50±1.84µm, respectively (p<0.001).Color difference map analysis showed a uniform green distribution across the surface in Group A. In contrast, Group B showed increased red areas on the buccal and lingual posterior surfaces and irregular blue areas on the occlusal surfaces. Conclusion:The accuracy of LCD 3D-printed orthodontic models was significantly affected by the data acquisition method, with IOS-derived models showing superior trueness compared with CBCT-derived models.However, both methods remained within clinically acceptable limits, supporting their use for orthodontic diagnosis and appliance fabrication.