Preliminary three-dimensional analysis of posed smile / 中华口腔医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To analyze the changes in facial feature region during posed smile three dimensionally.</p><p><b>METHODS</b>The three-dimensional facial images during posed smiles and resting position in 44 volunteers (18 men, 26 women, 26.7 ± 2.6 years old) were acquired by using FaceScan optical three-dimensional sensor. These scanned three-dimensional images were processed and superimposed with commercially-available reverse modeling software. Quantitative and qualitative three dimensional analyses of changes in facial feature region during posed smile were done by using color maps.</p><p><b>RESULTS</b>The changing area accounted for (29.65 ± 8.40)% during posed smile, and the difference of the left and right half face was 6.69% (2.07%, 13.11%). Displacements in cheilion, zygomatic area, lower lip were detected in every subject during posed smile. Women [(4.49 ± 1.51) mm] gained more changes than men [(3.25 ± 1.75) mm] did in nasolabial fold.</p><p><b>CONCLUSIONS</b>Posed smile was asymmetric. Displacement variation and ratio are different at facial feature regions.Women shows greater changes around lips during posed smile.</p>