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Relationship between upper and lower molars during mastication
Haruo Okayasu1, Hiroyuki Miura, Daizo Okada
1Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
Journal of Medical and Dental Sciences
|January 27, 2010
Summary
The relationship between upper and lower molars changes during early mastication. This suggests food texture evolution influences chewing patterns in the initial stages.
Area of Science:
- Biomechanical Engineering
- Dental Mechanics
- Human Physiology
Background:
- Understanding molar interactions is crucial for analyzing masticatory function.
- Early mastication stages are key to food breakdown and nutrient absorption.
Purpose of the Study:
- To investigate the dynamic relationship between upper and lower molars during the initial phase of mastication.
- To evaluate how occlusal contact changes influence chewing patterns.
Main Methods:
- Utilized a 3D shape measurement system and a 6-DOF mandibular tracking device.
- Measured occlusal contact areas and calculated distance ratios between molar reference points.
- Analyzed early (first 5) versus late (last 5) chewing cycles of gum.
Main Results:
- A significant difference was found in the AB ratio between early and late chewing phases.
- This difference was observed near the terminal position of masticatory movements (p < 0.05).
Conclusions:
- Molar relationships and occlusal contact patterns evolve during early mastication.
- Changes in food texture throughout the chewing process likely influence masticatory path.
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