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Multidirectional lip-closing force in adults with mandibular deviation.

A Kawabata¹, T Kobayashi, A Takagi

¹Department of Orthodontics, School of Dentistry, Asahi University, Mizuho, Japan.

Journal of Oral Rehabilitation

|July 17, 2013

Summary

This study found that individuals with mandibular deviation exhibit altered directional lip-closing force (DLCF). Specifically, lower non-deviated DLCF was reduced, and greater deviation correlated with weaker upper deviated DLCF.

Keywords:

facial soft tissue lip pursing lip-closing force mandibular deviation multidirectional measurement oro-facial function

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Area of Science:

Orthodontics
Craniofacial Morphology
Biomechanics

Background:

Mandibular deviation impacts facial structure and function.
Understanding lip muscle function is crucial for assessing facial asymmetry.

Purpose of the Study:

To investigate the relationship between multidirectional lip-closing force and facial soft tissue morphology in adults with mandibular deviation.
To analyze the correlation between the degree of mandibular deviation and lip-closing forces.

Main Methods:

Fifteen Japanese adults with mandibular deviation were assessed.
Multidirectional lip-closing force (DLCF) was measured in 8 directions.
Total lip-closing force (TLCF) was calculated; deviation value was defined and measured.

Main Results:

Significant positive correlations were found between TLCF and DLCFs in six directions.
Seven pairs of opposing DLCFs showed significant positive correlations.
Lower non-deviated DLCF was smaller than opposing forces; greater deviation correlated with smaller upper deviated DLCF.

Conclusions:

Lip-closing force patterns are altered in individuals with mandibular deviation.
Reduced lip muscle function, particularly on the non-deviated side, is observed.
The degree of mandibular deviation influences the strength of lip-closing forces on the deviated side.