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Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
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Relationship and spatial differences between mandibular movement and complementary mandibular movement.
Hisaki Ogihara1, Shuji Shigemoto1, Takuya Kihara1
1Department of Fixed Prosthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
Journal of Prosthodontic Research
|March 11, 2026
Summary
Mandibular movement (MM) and complementary mandibular movement (cMM) are not perfectly symmetrical and have distinct rotational axes. Understanding both MM and cMM is crucial for accurate CAD-CAM prosthetic design.
Area of Science:
- Biomechanics of jaw movement
- Dental prosthetics and CAD-CAM technology
Background:
- Mandibular movement (MM) describes the motion of the lower jaw.
- Complementary mandibular movement (cMM) quantifies the relative motion of the maxilla to the mandible.
- Understanding their relationship is vital for dental applications.
Purpose of the Study:
- To elucidate the relationships and differences between MM and cMM.
- To analyze their spatial characteristics, symmetry, and rotational axes.
- To assess the implications for CAD-CAM workflows.
Main Methods:
- Jaw movements (SAG, LAT, PRO) were recorded in 27 healthy adults using electromagnetic jaw tracking.
- cMM data were derived as inverse matrices of MM data.
- Kinematic Axes (KA) and complementary Kinematic Axes (cKA) were calculated and compared for symmetry.
Main Results:
- MM and cMM showed partial symmetry near the intercuspal position but lacked complete correspondence.
- Protrusion-retrusion (PRO) movement exhibited greater symmetry than sagittal (SAG) and lateral (LAT) movements.
- The cKA was located antero-superior to the KA, with significantly larger maximum displacement at the cKAP.
Conclusions:
- Mandibular movement (MM) and complementary mandibular movement (cMM) are not point-symmetric, and their rotational axes (KA and cKA) do not coincide.
- Accurate recognition of both MM and cMM is essential for CAD-CAM prosthetic designs.
- This research provides critical insights for optimizing dental workflows.
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