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Associations between upper lip activity and incisor position.
1Department of Orthodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey. nkilic@atauni.edu.tr
Australian Orthodontic Journal
|June 26, 2010
Summary
Upper lip muscle activity, measured by electromyography (EMG), does not significantly affect incisor inclination, overjet, or overbite in Class I malocclusion. This suggests lip muscle function has minimal impact on these dental measurements.
Area of Science:
- Orthodontics
- Dental Biomechanics
- Electromyography
Background:
- Upper lip muscle activity is hypothesized to influence incisor positioning.
- Understanding this relationship is crucial for orthodontic diagnosis and treatment planning.
Purpose of the Study:
- To investigate the association between upper lip muscle activity and dental measurements.
- Specifically examining incisor inclinations, overjet, and overbite in relation to lip muscle function.
Main Methods:
- Electromyography (EMG) recorded upper lip muscle activity (orbicularis oris) in 45 subjects (11-15 years) with Class I malocclusion.
- Dental measurements including incisor inclinations, overjet, and overbite were obtained from lateral cephalometric radiographs.
- Correlations were calculated between EMG data and cephalometric variables during various activities (rest, clenching, chewing, swallowing).
Main Results:
- No significant gender differences were observed in upper lip EMG activity.
- No statistically significant associations were found between upper lip muscle activity and incisor inclinations.
- Similarly, no significant correlations were identified between lip muscle activity and overjet or overbite.
Conclusions:
- Upper lip muscle activity does not appear to significantly influence the static positions of the incisors.
- The findings suggest that factors other than upper lip muscle function are primary determinants of incisor position and malocclusion characteristics.
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