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Reliability of novel multidirectional lip-closing force measurement system
K Nakatsuka1, T Adachi, T Kato
1Matsumoto Dental University, Department of Orthodontics, Nagano, Japan.
Journal of Oral Rehabilitation
|August 21, 2010
Summary
This study quantified directional lip-closing force (LCF) using a novel system, finding it reliable for assessing lip function. Measurements showed directional specificity and high correlation with muscle activity.
Area of Science:
- Biomechanics
- Physiology
- Speech Science
Background:
- Assessing lip function is crucial for understanding speech and swallowing.
- Quantifying multidirectional lip-closing force (LCF) provides insights into oral motor control.
- Existing measurement systems may lack precision or comprehensive directional analysis.
Purpose of the Study:
- To quantify the directional specificity of multidirectional lip-closing force (LCF).
- To evaluate the reliability of LCF measurements using a novel system.
- To assess the correlation between LCF and orbicularis oris muscle electromyograms (EMGs).
Main Methods:
- LCFs in eight directions and EMGs from orbicularis oris muscles (OOM) were recorded in 14 healthy subjects.
- Quantitative reliability was assessed using repeated measurements and total lip-closing force (TLCF).
- Intra- and inter-investigator reliabilities were determined using interclass correlations.
Main Results:
- Lip-closing forces demonstrated directional specificity across vertical, horizontal, and oblique directions.
- The novel system exhibited high quantitative reliability for LCF (0.735–0.948) and TLCF (0.934).
- Intra- and inter-investigator reliabilities were excellent (ICC=0.96), with strong correlations (r > 0.95) between LCF and OOM EMGs.
Conclusions:
- The novel system demonstrates good quality and reliability for quantitative, multidirectional LCF measurements.
- This system is suitable for evaluating lip functions in clinical and research settings.
- Findings support the use of this system for precise assessment of oral motor control.
