Dental dedicated MRI: A Reliable Radiation-Free Tool for Orthodontic Landmark Identification

A new study published in the journal of Imaging Science in Dentistry revealed that 5T dental-dedicated magnetic resonance imaging (ddMRI) is a feasible imaging modality for 2D orthodontic landmark identification, which demonstrates high intra- and inter-rater reliability. This offers a dependable, radiation-free alternative for orthodontic diagnosis and treatment planning.

Lateral cephalograms have long been the standard imaging method for identifying anatomical landmarks and conducting cephalometric analysis in orthodontics. However, their reliance on ionizing radiation raises ongoing concerns in younger patients and those requiring repeated imaging. Thus, studies have been exploring MRI as a safer alternative capable of visualizing both hard and soft tissues without radiation exposure.

This study evaluated whether ddMRI could reliably replicate the landmark identification typically performed on cephalograms. 13 adult volunteers (7 men and 6 women) with an average age of 33 years underwent ddMRI scans. Using specialized imaging software, 3 independent raters were tasked with identifying and annotating key orthodontic landmarks on two separate occasions.

The analysis focused on both intra-rater consistency (how consistent each rater was with themselves over time) and inter-rater agreement (how closely different raters aligned with one another). These results were highly promising, where intra-rater reliability scores ranged from 0.909 to 0.999, and inter-rater scores ranged from 0.988 to 0.999. These findings indicate that ddMRI can produce highly consistent and reproducible landmark identifications.

This research measured the differences in annotated landmark positions using linear distances in millimeters which helps further in assessing accuracy. Bland-Altman plots were employed to visualize agreement and detect any systematic bias between measurements. The results showed minimal variation, which reinforced the reliability of this method.

Overall, this study demonstrates that ddMRI can reliably identify cephalometric landmarks in two dimensions and this opens options to safer imaging protocols in orthodontics. This is certainly relevant for patients who require multiple imaging sessions over time, like adolescents who undergo long-term treatment. Future research will be imperative to confirm these findings across more diverse populations and explore how ddMRI performs in routine clinical workflows.

Source:

Srivastav, S., Stoustrup, P. B., Liu, J., Federici, M. I., Christensen, J., & Spin-Neto, R. (2026). Reliability of dental-dedicated magnetic resonance imaging for 2-dimensional orthodontic diagnosis: A pilot study of landmark identification. Imaging Science in Dentistry, 56(1), 36–44. https://doi.org/10.5624/isd.20250201