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Is the reverse cycle during chewing abnormal in children with primary dentition?
I Saitoh1, C Yamada, H Hayasaki
1Department of Paediatric Dentistry, Field of Developmental Medicine, Course for Health Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan. isseionj@denta.hal.kagoshima-u.ac.jp
Journal of Oral Rehabilitation
|October 31, 2009
Summary
The reverse chewing cycle, common in children with primary dentition, is not abnormal. This chewing pattern exhibits a smaller lateral component, reflecting natural developmental differences in muscle control.
Area of Science:
- Dental Science
- Biomechanics
- Pediatric Dentistry
Background:
- Chewing cycle analysis is crucial for understanding masticatory function.
- Previous research has not definitively established the normality of reverse chewing cycles in children.
Purpose of the Study:
- To investigate whether the reverse chewing cycle is abnormal in children with primary dentition.
- To compare chewing cycle patterns between children and adults.
Main Methods:
- Opto-electronic analysis system (TRI-MET) recorded chewing movements in children and adults.
- Chewing gum was used, and cycles were analyzed from frontal views.
- Multilevel statistical models compared cycle shapes and lateral components between groups.
Main Results:
- Adults predominantly exhibited type II cycles with lateral closing pathways.
- Children showed a higher prevalence of type V (reverse) cycles with medial closing pathways.
- Children demonstrated significantly smaller lateral components during chewing compared to adults (P < 0.05).
Conclusions:
- The reverse chewing cycle is a normal finding in children with primary dentition.
- Differences in lateral components reflect developmental variations in controlling asymmetric muscle activity.
- This study clarifies masticatory development in young children.
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