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Related Experiment Video

Updated: Jan 9, 2026

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Predicting Skeletal Landmarks from Soft-Tissue Landmarks Using Machine Learning: A Study on Nasion Localization.

B Baldini, A Shadman Yazdi, M Serafin

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 3, 2025
    PubMed
    Summary
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    Machine learning models can predict skeletal nasion position from soft-tissue landmarks, offering a radiation-reducing alternative for cephalometric analysis in orthodontics and surgery.

    Area of Science:

    • Orthodontics and Maxillofacial Surgery
    • Medical Imaging
    • Machine Learning

    Background:

    • Cephalometric analysis is vital for orthodontics and maxillofacial surgery, traditionally using X-rays.
    • Reduced Field of View (FOV) Cone Beam Computed Tomography (CBCT) minimizes radiation but may omit key skeletal landmarks like the nasion.
    • Accurate nasion identification is crucial for effective treatment planning.

    Purpose of the Study:

    • To investigate the feasibility of predicting the skeletal nasion position using machine learning (ML) models.
    • To assess the accuracy of ML models in estimating nasion from soft-tissue landmarks.
    • To explore a less-invasive alternative for cephalometric analysis, reducing radiation exposure.

    Main Methods:

    • Analyzed a dataset of 137 CBCT scans.

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  • Utilized soft-tissue landmarks (Sellion, Tragus, Alare) as predictors.
  • Evaluated Linear Regression, Random Forest, and Feedforward Neural Network (FFNN) models via 10-fold cross-validation.

    • Main Results:

    • Linear Regression achieved the highest accuracy with a mean Euclidean error of 1.452 ± 1.077 mm.
    • ML models demonstrated reliable estimation of skeletal landmarks from soft-tissue features.
    • The findings support the use of ML for predicting nasion position.

    Conclusions:

    • ML models can accurately predict skeletal landmarks from soft-tissue references, offering a radiation-minimizing approach to cephalometric analysis.
    • This method enables nasion estimation without full-cranium CBCT, enhancing safety, especially for pediatric and radiation-sensitive patients.
    • Further AI development in landmark prediction can advance non-invasive craniofacial diagnostics and improve patient care.