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. 2011 Sep;81(5):750-3.
doi: 10.2319/103010-639.1. Epub 2011 Mar 29.

Nasal obstruction causes a decrease in lip-closing force

Kishio Sabashi  1 , Kaei Washino, Issei Saitoh, Youichi Yamasaki, Atsushi Kawabata, Yousuke Mukai, Noriyuki Kitai
Affiliations

Nasal obstruction causes a decrease in lip-closing force

Kishio Sabashi et al. Angle Orthod. 2011 Sep.

Abstract

Objective: To investigate the relationship between nasal obstruction and lip-closing force.

Materials and methods: Nasal airway resistance and lip-closing force measures were recorded for 54 Japanese females. The subjects were classified into normal and nasal obstruction groups according to nasal airway resistance values. Differences between the normal and nasal obstruction groups in lip-closing force were tested statistically. Correlation coefficients were calculated between the measures for the normal and nasal obstruction groups.

Results: Lip-closing force for the nasal obstruction group was significantly less than for the normal group (P < .05). In the normal group, nasal airway resistance did not correlate with lip-closing force, while in the nasal obstruction group a significant negative correlation was found between nasal airway resistance and lip-closing force (P < .05).

Conclusions: Nasal obstruction is associated with a decrease in lip-closing force. When the severity of nasal obstruction reaches a certain level, the lip-closing force is weakened.

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Figures

Figure 1
Figure 1
Anterior rhinomanometry device for measurement of nasal airway resistance (RHINOREOGRAPH MPR-3100, Nihon-Kohden Co, Ltd, Tokyo, Japan).
Figure 2
Figure 2
Full view of strain measuring device for maximum lip-closing force (LIP DE CUM LDC®-110R, Cosmo-Instruments, Co, Ltd, Tokyo, Japan).
Figure 3
Figure 3
Example of measuring maximum lip-closing force.
Figure 4
Figure 4
Relationship between nasal airway resistance and lip closing-force in the normal group (n  =  40).
Figure 5
Figure 5
Relationship between nasal airway resistance and lip closing-force in the nasal obstruction group. (The straight line in the graph indicates regression equation. y  =  −0.019x + 0.504; γ  =  0.616; n  =  14; P < .05.)
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