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KMID : 0361920140440020062
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Korean Journal of Orthodontics
2014 Volume.44 No. 2 p.62 ~ p.68
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Three-dimensional symmetry and parallelism of the skeletal and soft-tissue poria in patients with facial asymmetry
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Kim Min-Gun
Lee Jin-Woo
Cha Kyung-Suk
Chung Dong-Hwa
Lee Sang-Min
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Abstract
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Objective: The purpose of this study was to examine the symmetry and parallelism of the skeletal and soft-tissue poria by three-dimensional (3D) computed tomographic (CT) imaging.
Methods: The locations of the bilateral skeletal and soft-tissue poria in 29 patients with facial asymmetry (asymmetric group) and 29 patients without facial asymmetry (symmetric group) were measured in 3D reconstructed models of CT images by using a 3D coordinate system. The mean intergroup differences in the anteroposterior and vertical angular deviations of the poria and their anteroposterior and vertical parallelism were statistically analyzed.
Results: The symmetric and asymmetric groups showed significant anteroposterior angular differences in both the skeletal and the soft-tissue poria (p = 0.007 and 0.037, respectively; Mann-Whitney U-test). No significant differences in the anteroposterior and vertical parallelism of the poria were noted (p ≤ 0.05; Wilcoxon signed-rank test).
Conclusions: In general, the skeletal poria are parallel to the soft-tissue poria. However, patients with facial asymmetry tend to have asymmetric poria.
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KEYWORD
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Computed tomography, Soft tissue, Anatomy, Facial asymmetry, Porion, Parallelism
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