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Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
Published on: February 23, 2024
Masticatory jaw movement optimization after introduction of occlusal interference
K Yashiro1, T Fukuda, K Takada
1Osaka University Graduate School of Dentistry, Orthodontics and Dentofacial Orthopedics, Suita, Osaka, Japan.
Journal of Oral Rehabilitation
|December 9, 2009
Summary
Jaw occlusion changes impact chewing smoothness. Healthy adults adapted quickly to artificial occlusal interference, regaining movement skill within 90 chewing cycles.
Area of Science:
- Biomechanics
- Neuromuscular control
- Dental occlusion
Background:
- The impact of altered occlusion on the control characteristics of masticatory jaw movements is not well understood.
- Assessing changes in movement skilfulness after occlusal alterations is crucial for understanding jaw adaptation.
Purpose of the Study:
- To investigate how occlusal interference affects the control characteristics of human jaw movements during chewing.
- To evaluate the adaptive recovery of jaw motion following acute occlusal changes.
Main Methods:
- Introduced artificial occlusal interference to the non-working side of the upper molar in 10 healthy adults.
- Recorded mandibular incisor-point movements using a 3D tracking device during unilateral chewing.
- Analyzed changes in normalized jerk-cost (NJC) and velocity profiles of jaw closing movements.
Main Results:
- Occlusal interference significantly increased normalized jerk-cost (NJC) and prolonged the decelerative phase of jaw closing.
- Peak velocity of jaw closing movement decreased following the introduction of occlusal interference.
- Significant recovery in NJC and velocity profiles was observed within approximately 90 repetitive chewing cycles.
Conclusions:
- Acute adaptive changes in jaw motion occur in response to occlusal interference.
- The jaw system demonstrates a recovery process to restore movement smoothness and velocity profile after occlusal alteration.
- These findings highlight the adaptability of masticatory jaw control to changes in occlusion.
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