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Section showing minimal intra-individual variations in masticatory movement.
Hiroshi Shiga1, Yoshinori Kobayashi, Christian S Stohler
1Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan. h-shiga@tokyo.ndu.ac.jp
Nihon Hotetsu Shika Gakkai Zasshi
|May 10, 2008
Summary
Masticatory movements, including gape and cycle time, stabilize after the initial cycles when chewing gum. This study identifies the optimal chewing cycles for minimal variation in mandibular incisal point motion.
Area of Science:
- Biomechanics of mastication
- Human jaw movement analysis
Background:
- Understanding the dynamics of masticatory movements is crucial for various dental and neurological applications.
- Previous research has explored jaw motion, but specific phases of minimal intraindividual variation during chewing require further clarification.
Purpose of the Study:
- To pinpoint the chewing cycles exhibiting the least variation in mandibular incisal point movement during softened gum mastication.
- To analyze spatial (gape, width) and temporal (cycle time) parameters of chewing.
Main Methods:
- Twenty healthy subjects chewed softened gum for 20 seconds.
- Spatial and temporal parameters of the mandibular incisal point were recorded for 20 cycles.
- Coefficients of variation for these parameters were analyzed across consecutive series of cycles.
Main Results:
- Masticatory parameters peaked in the first cycle, then stabilized by the fourth or fifth cycle.
- Coefficients of variation were highest initially, decreasing until the fourth to sixth series, then slightly increasing.
- Minimal variation was observed between the fourth and sixth chewing cycles.
Conclusions:
- The period from the fourth to the tenth chewing cycle demonstrates the most consistent mandibular incisal point movement during softened gum mastication.
- These findings provide a basis for understanding stable chewing patterns.
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