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KMID : 0988420010130040394
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Journal of Dental Science (C.N.U.)
2001 Volume.13 No. 4 p.394 ~ p.403
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Classification of Facial Asymmetry by Cluster Analysis
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Abstract
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The purpose of this study was to classify the facial asymmetry by cluster analysis using the variables of the posteroanterior cephalogram, and to find out the characteristics of each group.
The posteroanterior cephalogram and frontal facial photograph of one hundred orthodontic patients were used. Cluster analysis was executed using the measurements which indicated the degree of facial asymmetry. The resultant groups were compared each other according to the measurements to find out the characteristics of each group. Through the statistical analysis, following results were obtained.
1. Facial asymmetry was classified into five groups, A, B, C, D, and E, on the basis of menton deviation, apical base midline discrepancy and vertical difference of distance between right and left antegonions.
2. The degree of Menton deviation was severe in the group A, moderate in the group C and D, and mild in the group B and E.
3. Apical base midline discrepancy showed high value in the group A and C.
4. Antegonion was superiorly positioned on the same side of menton deviation in the group A and D, whereas it was superiorly positioned on the opposite side of menton deviation in the group B.
5. All measurements except the curvature of mandibular inferior border showed high value in the group A whereas very low in the group E.
6. While the characteristics of the group D were similar with those of the group A, the degree of difference was less in the group D. The group B showed unique characteristics as many measurements showed negative value.
The above results suggest that facial asymmetry can be simply classified by cluster analysis on the basis of menton deviation, apical base midiine discrepancy and the vertical positional difference of antegonion between right and left sides.
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