Korean J Orthod.  1997 Oct;27(5):801-813.

A comparative study on chewing movement in normal occlusion and skeletal Class III malocclusion

• Sung KH
• Sung JH

Abstract

A comparative study was made on the chewing movements of normal occlusion and skeletal class III malocciusion. Thirty normal occlusion sybjects and twenty skeletal class III malocciusion patients were given chewing gums for the study ; using BioPAK system, the chewing movement on the frontal plane was recorded and analyzed. With a typical chewing path chosen representing each subject, chewing width, poening distance, poening and closing angles, maximum opening and closing velocities were observed. Seven characteristic patterns were classfied based on the types of chewing paths. The followings are the results : 1. Compared with the normal occlusion group, the skeletal class III malocclusion group showed more varied and vertical chewing patterns. 2. In comparision of chewing widths, skeletal class III malocclusion group showed marrower path than the mormal occlusion group(P<0.01). 3. In opening distance, skeletal class III malocclusion groupappeared shorter than the normal occlusion group without statistical significance(P>0.05). 4. In opening and closing angles, skeletal class III malocclusion group showed more acute angles than the normal occlusion group(P<0.01). 5. In maximum opening and closing velocities, skeletal class III malocclusion group was slower than the normal occlusion group but with no statistical significance(P>0.05). 6. In the classification of chewing movement pattern, Type IV(chopping type)of skeletal class III malocclusion group showed a higher rate with 25.0% over 3.3% of normal occlusion group.

Keyword

Skeletal class III malocculsion; Normal occlusion; Chewing movement; Chewing pattern; Chopping pattern

MeSH Terms

Bone Marrow
Chewing Gum
Classification
Humans
Malocclusion*
Mastication*
Chewing Gum