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Received: 2006-11-12

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Journal of Zhejiang University SCIENCE B 2007 Vol.8 No.5 P.296~301


Pressure from the lips and the tongue in children with class III malocclusion

Author(s):  RUAN Wen-hua, SU Ji-mei, YE Xiao-wei

Affiliation(s):  Department of Stomatology, Children’ more

Corresponding email(s):   ruanwh@hzcnc.com

Key Words:  Deciduous dentition, Perioral force, Pressure transducer, Class III malocclusion

RUAN Wen-hua, SU Ji-mei, YE Xiao-wei. Pressure from the lips and the tongue in children with class III malocclusion[J]. Journal of Zhejiang University Science B, 2007, 8(5): 296~301.

@article{title="Pressure from the lips and the tongue in children with class III malocclusion",
author="RUAN Wen-hua, SU Ji-mei, YE Xiao-wei",
journal="Journal of Zhejiang University Science B",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Pressure from the lips and the tongue in children with class III malocclusion
%A RUAN Wen-hua
%A SU Ji-mei
%A YE Xiao-wei
%J Journal of Zhejiang University SCIENCE B
%V 8
%N 5
%P 296~301
%@ 1673-1581
%D 2007
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2007.B0296

T1 - Pressure from the lips and the tongue in children with class III malocclusion
A1 - RUAN Wen-hua
A1 - SU Ji-mei
A1 - YE Xiao-wei
J0 - Journal of Zhejiang University Science B
VL - 8
IS - 5
SP - 296
EP - 301
%@ 1673-1581
Y1 - 2007
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2007.B0296

Objective: To discuss possible relationships between class III malocclusion and perioral forces by measuring the pressure from the lips and the tongue of children with class III malocclusion. Methods: Thirty-one children with class III malocclusion were investigated and their perioral forces were measured at rest and during swallowing under natural head position by a custom-made miniperioral force computer measuring system. Results: The resting pressures exerted on the labial side and palatine side of the upper left incisor, as well as the labial side and lingual side of the lower left incisor, were 0 g/cm2, 0 g/cm2, 0.57 g/cm2 and 0.23 g/cm2, respectively. Correspondingly, the swallowing forces were 2.87 g/cm2, 5.97 g/cm2, 4.09 g/cm2 and 7.89 g/cm2, respectively. No statistical difference between muscular pressure and gender existed. During swallowing, the lingual forces were significantly higher than the labial forces (P<0.01), however, at rest there was no significantly different force between these two sides. Compared to the normal occlusion patients, children with class III malocclusion had lower perioral forces. The upper labial resting forces (P<0.01), the lower labial resting forces (P<0.05) and all the swallowing pressures from the lips and the tongue (P<0.01) showed statistical differences between the two different occlusion conditions. Meanwhile, no significant difference was found for the resting pressure from the tongue between class III malocclusion and normal occlusion. Conclusion: Patients with class III malocclusion have lower perioral forces and this muscle hypofunction may be secondary to the spatial relations of the jaws. The findings support the spatial matrix hypothesis.

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