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Functional Masticatory Angle and Hyoid Bone Position: A Pilot Study on Occlusal Symmetry and Morphofunctional
Lorena Sigwald-Serpa1, Icíar Sanz-Orrio Soler1, Laura Marqués-Martínez1
1Faculty of Medicine and Health Sciences, Catholic University of Valencia, San Vicente Martir, 46001 Valencia, Spain.
Dentistry Journal
|October 28, 2025
Summary
This study suggests a link between chewing patterns and hyoid bone position, with the Functional Masticatory Angle of Planas (AFMP) showing promise for assessing functional occlusion.
Area of Science:
- Orthodontics
- Craniofacial dynamics
- Masticatory system function
Background:
- The hyoid bone is crucial for stomatognathic system coordination.
- Its position variability with masticatory patterns is known, but its link to functional occlusion is understudied in orthodontics.
Purpose of the Study:
- To explore the association between masticatory type and hyoid bone position.
- To evaluate the Functional Masticatory Angle of Planas (AFMP) for classifying masticatory patterns.
Main Methods:
- Descriptive, observational, cross-sectional pilot study with 18 patients.
- Measured right and left AFMPs from intraoral photographs.
- Assessed hyoid bone position (aligned/displaced) via panoramic radiographs.
Main Results:
- Hyoid bone elevation often correlated with a smaller AFMP on the same side, indicating potential adaptive response to unilateral masticatory dominance.
- High intraobserver reliability was confirmed for AFMP and hyoid measurements.
Conclusions:
- A potential relationship exists between functional masticatory asymmetry and hyoid bone position.
- The AFMP shows promise as a clinical tool for evaluating functional occlusion in craniofacial dynamics.
- Further research with larger samples is recommended.
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