Korean J Orthod.  2012 Apr;42(2):56-63. 10.4041/kjod.2012.42.2.56.

Three-dimensional soft tissue analysis for the evaluation of facial asymmetry in normal occlusion individuals

• Hwang HS
• Yuan D
• Jeong KH
• Uhm GS
• Cho JH
• Yoon SJ

• KMID: 2273256
• DOI: http://doi.org/10.4041/kjod.2012.42.2.56

Abstract

OBJECTIVE
To identify the right and left difference of the facial soft tissue landmarks three-dimensionally from the subjects of normal occlusion individuals.
MATERIALS AND METHODS
Cone-beam computed tomography (CT) scans were obtained in 48 normal occlusion adults (24 men, 24 women), and reconstructed into 3-dimensional (3D) models by using a 3D image soft ware. 3D position of 27 soft tissue landmarks, 9 midline and 9 pairs of bilateral landmarks, were identified in 3D coordination system, and their right and left differences were calculated and analyzed.
RESULTS
The right and left difference values derived from the study ranged from 0.6 to 4.6 mm indicating a high variability according to the landmarks. In general, the values showed a tendency to increase according to the lower and lateral positioning of the landmarks in the face. Overall differences were determined not only by transverse differences but also by sagittal and vertical differences, indicating that 3D evaluation would be essential in the facial soft tissue analysis.
CONCLUSIONS
Means and standard deviations of the right and left difference of facial soft tissue landmarks derived from this study can be used as the diagnostic standard values for the evaluation of facial asymmetry.

Keyword

Three-dimensional; Soft tissue; Facial asymmetry; Cone-beam CT

MeSH Terms

Adult
Cone-Beam Computed Tomography
Facial Asymmetry
Humans
Male

Figure

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  Figure 1 Graphic representation of the landmarks used in this study.

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  Figure 2 The right and left differences for each coordinate direction in the bilateral landmarks. The differences were present not only in transverse directions but also in sagittal and vertical directions.

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