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Maximum bite force, muscle efficiency and mechanical advantage in children with vertical growth patterns
Patricia García-Morales1, Peter H Buschang, Gaylord S Throckmorton
1Department of Orthodontics, Baylor College of Dentistry, The Texas A&M University System Health Science Center, Dallas 75246, USA.
European Journal of Orthodontics
|July 2, 2003
Summary
Children with larger faces have better muscle efficiency and larger moment arms. Greater facial hyperdivergence in children is linked to reduced mechanical advantage and lower maximum bite force.
Area of Science:
- Craniofacial morphology
- Biomechanics
- Pediatric dentistry
Background:
- Understanding the relationship between craniofacial structure and function is crucial for pediatric dental and orthodontic assessments.
- Previous research has explored these correlations in adults, but data in children, particularly those with vertical growth patterns, is less comprehensive.
Purpose of the Study:
- To investigate the correlation between maximum bite force, masticatory muscle electromyography (EMG) activity, craniofacial morphology, and mechanical advantage in children.
- To analyze how vertical growth patterns influence these biomechanical and morphological relationships in pediatric subjects.
Main Methods:
- Lateral cephalograms were used to record 13 morphological and 8 biomechanical measurements in 47 children (mean age 9.3 years).
- Maximum and submaximal bite forces, along with associated EMG activity of masticatory muscles, were recorded at the mandibular first molar.
- Factor analysis was employed to reduce variables and explore underlying structural relationships.
Main Results:
- No significant sex differences were observed in morphological, functional, or biomechanical variables.
- A negative correlation was found between the vertical size factor and muscle efficiency, and a positive correlation with the moment arm factor.
- Morphological divergence negatively correlated with bite force and mechanical advantage, while muscle efficiency was negatively correlated with the moment arm.
Conclusions:
- Children with larger facial dimensions exhibit larger moment arms and require less muscle activity for a given force, indicating greater muscle efficiency.
- Increased facial hyperdivergence in children is associated with poorer mechanical advantage and reduced maximum bite force, mirroring findings in adults.