Journal Article

Describing shape changes in the human mandible using elliptical Fourier functions

SYY Chen, PE Lestrel, WJS Kerr and JH McColl

in The European Journal of Orthodontics

Published on behalf of European Orthodontic Society

Volume 22, issue 3, pages 205-216
Published in print June 2000 | ISSN: 0141-5387
Published online June 2000 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/22.3.205
Describing shape changes in the human mandible using elliptical Fourier functions

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Elliptical Fourier functions (EFF) were generated for the boundary outline of the mandibular form in 24 non-orthodontic growth study subjects at 9, 11, 13, and 15 years of age. The mean residual fit (observed versus predicted points) of the mandibular form was 0.11 mm, with a range from 0.09 to 0.14 mm, suggesting an accurate fit. The mean plot for each of the four age groups was area standardized and superimposed on the centroid. Shape changes in males and females were found to be similar. No significant shape changes were found between 9 and 11 years. Shape changes were observed in the lower incisor area, the mental region, the body of the mandible, and the gonial angle area between 11 and 15 years. These changes coincided with the onset of the pubertal growth spurt.

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Subjects: Restorative Dentistry and Orthodontics

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