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Correlation between inclination of occlusal plane and masticatory movement
T Ogawa1, K Koyano, T Suetsugu
1Department of Prosthetic Dentistry II, Faculty of Dentistry, Kyushu University, Fukuoka, Japan. ogawa@dhembox.nc.kyushu-u.ac.jp
Objectives:
The purpose of this study was to investigate the relationship between the inclination of the occlusal plane and masticatory movement.
Methods:
Masticatory movements of 41 young adults were measured using the three-dimensional Mandibular Movement Analyzing System. The inclination of the occlusal plane was measured in the sagittal plane using a three-dimensional digitizer.
Results:
In the sagittal plane, the masticatory closing path and the occlusal plane were consistent in maintaining a perpendicular relation with each other regardless of the inter-individual variation of the inclination of the occlusal plane. Subjects with an anteriorly inclined occlusal plane showed a vertical closing path, and subjects with a posteriorly inclined occlusal plane showed a flat closing path in the frontal plane. These characteristics were explained by the variation of the timing on the balancing-side condylar return correlated with the inclination of the occlusal plane.
Conclusions:
There is a significant correlation between the inclination of the occlusal plane and the direction of the closing path during mastication.