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A Study for Determining the Inclination of the Occlusal Plane from the Mandibular Functional Trajectory
Kazuhiro Ikeda1, Shuichiro Yamashita1
1Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan.
International Journal of Dentistry
|July 11, 2022
Summary
Functional jaw movements can determine the occlusal plane, offering an alternative to traditional morphological methods. This research aids in reconstructing dental occlusal planes using functional trajectories.
Area of Science:
- Dental Mechanics
- Biomechanics
- Prosthodontics
Background:
- Occlusal plane determination in prosthetics often relies on morphological landmarks like Camper's plane.
- Morphological landmarks may shift over time, impacting prosthetic accuracy.
- This study explores functional indexes as a more stable alternative for occlusal plane determination.
Purpose of the Study:
- To investigate the relationship between the maxillary occlusal plane and mandibular functional trajectory.
- To develop a method for reconstructing a lost occlusal plane using functional trajectories.
Main Methods:
- Jaw motion tracking (6-DOF) was used to record mandibular first molar and incisor trajectories.
- Measurements were taken during masticatory and tapping movements in 13 healthy dentulous individuals.
Main Results:
- The closing angle of the mandibular first molar to the maxillary occlusal plane averaged 74.1° near the intercuspal position.
- This angle showed a positive correlation with the closing angle of the incisal point during tapping movements (y=0.37x+45.99).
Conclusions:
- The closing angle of the incisal point during tapping movements can be used to derive the occlusal plane.
- Functional trajectories offer a viable method for reconstructing lost occlusal planes in dental prosthetics.
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