To study the characteristics of maxillofacial contour data of male young adult group and to compare the differences between data acquired by structured light three-dimensional scanning and CT.

From November 2017 to December 2017, 120 healthy male volunteers from the General Hospital of Southern Theatre Command aged 20 to 30 years, weighed 55-85 kg, and with the height between 160-185 cm were selected. Three groups were carried out according to the concentrative trend of BMI: 17≤BMI<22(group A), 22≤BMI<24(group B), 24≤BMI<29(group C). Structured light scanning: Each volunteer underwent facial scanning and measurement by 3D medical simulation system and 3D precision digital shaping software in the system respectively. CT scanning: CT was also used for whole skull scanning and the harvested 3D data was calculated and measured with Mimics 13.0 and Geomagic Studio 2013 software. Three groups of measurements were statistically compared between groups using Paired-t sample test, One-way ANOVA or Wilcoxon rank sum test. P<0.05 indicates statistical difference.

The result of structured light three-dimensional scanning data showed that the horizontal circumference of supraauricular base point (point A), tragus point (point B), earlobe point (point C) and midpoint of lip plane (point D) in group A were (276.70±11.71) mm, (286.06±7.69) mm, (256.53±11.01) mm, (244.89±11.85) mm. The values in group B were (289.22±8.91) mm, (301.57 ±3.61) mm, (270.68±11.85) mm and (257.02±11.76) mm. The values in group C were (297.53±5.70) mm, (314.12±4.73) mm, (278.29±9.04) mm and (260.21±17.33) mm. The results of CT three-dimensional reconstruction model: the horizontal circumference of superior ear base point, tragus point, ear lobe point and lip plane midpoint in group A were (274.55±9.98) mm, (283.33±7.35) mm, (260.32±12.64) mm, (241.97±11.94) mm. The values in group B were (286.40±7.29) mm, (300.28±2.73) mm, (274.89±7.91) mm and (253.84±12.04) mm. The values in group C were (293.27±8.18) mm, (310.38±8.43) mm, (283.41±10.94) mm and (254.67±13.71) mm. There was no significant difference between the two collection method (P>0.05). The statistical result of structured light three-dimensional scanning image data showed that there were significant differences between group A and group B, group A and group C, group B and group C(t=-5.798 6, -8.109 0, -4.044 3; P=0.000 0, 0.000 0, 0.000 1). By the circumference of horizontal plane at point B, there were significant differences between group A and group B, group A and group C, group B and group C(t=-12.190 0, -16.206 7, -12.054 2; P=0.000 0, 0.000 0, 0.000 0). There were significant differences in horizontal plane circumference between group A and group B, group A and group C, group B and group C(t=-6.078 8, -8.346 5, -2.686 5; P=0.000 0, 0.000 0, 0.009 2). Through the horizontal plane circumference of point C, there were significant differences between group A and group B, group A and group C, group B and group C. Through the horizontal plane circumference of point D, there were significant differences between group A and group B, group A and group C(t=-5.025 1, -4.495 4; P=0.000 0, 0.000 0). The difference between group B and group C was not statistically significant (t=-0.886 6, P=0.378 6). The statistical result of CT scanning reconstruction model data showed that there were significant differences in horizontal plane circumference between group A and group B, group A and group C, group B and group C(t=-6.520 5, -7.924 5, -3.495 7; P=0.000 0, 0.000 0, 0.000 9). According to the horizontal plane circumference of point B, there were significant differences between group A and group B, group A and group C, group B and group C. There were significant differences in horizontal plane circumference between group A and group B, group A and group C, group B and group C. By the circumference of horizontal plane at point C, there were significant differences between group A and group B, group A and group C, group B and group C(t=-6.596 1, -7.622 4, -3.637 7; P=0.000 0, 0.000 0, 0.000 6). According to the horizontal plane circumference of point D, there were significant differences between group A and group B, group A and group C (t=-4.846 0, -4.085 3; P=0.000 0, 0.000 1). The difference between group B and group C was not statistically significant (t=-0.254 2; P=0.800 1).

The three-dimensional data of the maxillofacial region of male young adults has a correlation with the BMI. Structured light three-dimensional scanning is a more accurate and convenient way to collect three-dimensional data of maxillofacial contour than CT scanning, which is helpful to improve the efficiency of clinical and scientific research.

Male; Young adults; Maxillofacial surgery; Contours; Three-dimensional scanning; Computerized tomography; Three-dimensional reconstruction