In the analysis of facial soft tissue, two-dimensional analysis used to be the mainstream. Recently, three-dimensional analysis methods have emerged, and some studies related with a non-contact optical laser scanner have been reported. It is known that the facial soft tissue changes with posture. The posture during surgical operation is different from usual.
The purpose of this study was to analyze the morphological changes of facial soft tissue depending on posture, especially in moving to the supine position from the upright position.
The samples were 20 adults (10 males and 10 female). Fifteen measurement points were set in reference to Martin’s anthropological landmarks, and the face was scanned with some postures. Two images were superimposed and each coordinate level was measured from the same three reference planes.
As a result, at the midline measurement points of the face, there was approximately no meaningful movement, but the measurement points that were located far from the midline moved to the outside, the upper part, and backward. In addition, the distance between two measured points on each scanner image was different from the normal direction distance for all measurement points, especially around the cheek and mandibular angle.
Regarding the evaluation of morphological changes, the measurement of normal direction distance may be enough, but it is suggested that the skin of the face extends and causes a major visual change.
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