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KMID : 0381219910230040438
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Journal of RIMSK
1991 Volume.23 No. 4 p.438 ~ p.451
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A Cephalometric Comparative Study on Soft Tissue Profile between Normal Occlusion and Malocclusion in Korean Adults
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Abstract
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The purpose of this article is to compare soft tissue profiles between Korean adults with normal occlusion and malocclusion and to identify the differences between them. The subjects of this cephalometric study were 40 males with normal occlusion(Group 1), 27 females with normal occlusion(Group 2), 28 adults with Angle´s Class II malocclusion (Group 3) and 41 adults with Angle´s Class III malocclusion (Group 4).
The results of this study were as follows;
1) People with Angle´s Class II malocclusion had tendency to have more labial tipping of lower teeth than people with normal occlusion. Through NOA angle measurement, it was determined that people with Angle´s Class II malocclusion had more protruding mid face than people with normal occlusion and people with Angle´s Class III malocclusion had retruding mid face.
2) Through Powell´s esthetic triangle analysis, it was determined that people with Angle´s Class II malocclusion had retruding chin and protruding nose.
3) No significant differences between people with normal occlusion and malocclusion could be identified by measuring soft tissue profile angle basis of S-NS plane.
4) There were significant differences between groups with normal occlusion and malocclusion by measuring Facial convexity angle (Significance level 99%).
5) By measuring the distance between each landmark basis of N-Pog plane, People with Angle´s Class II malocclusion were identified as having more protruding mid face, but there were no significant differences between people with normal occlusion and Angle´s Class III malocclusion.
6) By measuring the vertical dimension of the face, it was determined that the lower facial height was higher than the upper facial height in all groups, particularly in group with Angle´s Class III malocclusion.
7) By measuring the lips basis of E-line and S-line, it was determined that people with Angle´ s Class III malocclusion had more protruding lower lips than people with normal occlusion, while people with Angle´s Class II malocclusion had more protruding upper lips. By measuring the distance between the superior sulcus and inferior sulcus basis of H-line, people with Angle´ s Class II malocclusion had thicker upper lips than the other´s.
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