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KMID : 1012220210120010026
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Journal of Digitalized Dentistry
2021 Volume.12 No. 1 p.26 ~ p.32
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Effect of lip postures on three?dimensional changes in the nasal region
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Mai Hang-Nga
Lee Du-Hyeong
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Abstract
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Purpose: This study was to evaluate the effect of lip postures during rest and smile on the change of nose shape.
Materials and Method: Digitized nasal models were generated in rest and smiling lip postures using an intraoral scanner (n = 10 in each lip posture; total N = 20). A reference image was generated by using a high-resolution 3D facial model obtained with an industrial laser scanner. To assess the difference of the nasal scanned image, volume discrepancies were measured at four major nasal units, including the columella, alar lobules, tip, and dorsum. The discrepancies of image matching were calculated as root?mean?square errors (RMSE) between 3D surfaces. One?way analysis of variance (ANOVA) and Tukey’s post hoc tests was used to determine the differences among the scan images of the nasal at different nasal units. The student’s t?test was used to compare the means of RMSE values between the rest and smile lip postures (α=.05).
Results: RMSE value was significantly high at the alar lobules and low at the dorsum units for the smile lip postures (F = 17.55, P < 0.05); however, there was no difference among the nasal units in the rest lip posture (F = 2.032; P = 0.188). The rest posture resulted in smaller deviations of the scanned nasal image than did the smile in all nasal units, particularly at the alar lobules (P < 0.05).
Conclusions: The difference in lip postures significantly affected the nose shape. The highest volume discrepancies were found at the alar lobules, while the smallest discrepancies were found for the dorsum unit.
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KEYWORD
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Lip posture, Nose, Shape, Three-dimensional scan, Discrepancy
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