[EO-23] Influence of surface colors on three-dimensional facial scanner accuracy
[Abstract]
[Objective]
The aim of this study was to evaluate the accuracy of facial scans based on skin color using three different scanning systems.
[Method]
Three head mannequins, identical in shape and varying in skin color (light, tan, and dark groups), were scanned with an industry-standard handheld 3-dimensional (3D) scanner, a stationary dental facial scanner, and a tablet-based scanning application (n=10). Analyses were conducted for 3D surface deviations of both the entire face and the lip area separately, as well as for linear deviations between facial landmarks. For the surface deviation analysis, the industry-standard scanner was used as a reference. In the case of linear deviation analysis, manually measured values obtained using a vernier caliper were used as the reference. Deviations were calculated using 3D software programs. One- and two-way analyses of variance, Kruskal-Wallis H test, and Mann-Whitney U test were used for statistical analyses (α=.05).
[Results and Discussion]
In the analysis of surface deviation for facial scans, the light group exhibited significantly lower deviation compared to the dark group. For the lip area data from the dental facial scanner, there was a significant decrease in deviation with lighter skin tones. In linear measurement analysis, the stationary dental facial scanner demonstrated accuracy comparable to the industry-standard handheld 3D scanner, with no significant difference, and both were more accurate than the tablet-based scanning application, except the intercheilion distance.The accuracy of facial scans was generally higher in light skin color compared to those with darker skin. The dental facial scanner demonstrated greater accuracy than the tablet-based scanning application.
[References]
1) Amezua X, Iturrate M, Garikano X, et al. Analysis of the impact of the facial scanning method on the precision of a virtual facebow record technique: An in vivo study. J Prosthet Dent. 2023;130(3):382-391.
2) Piedra-Cascón W, Meyer MJ, Methani MM, et al. Accuracy (trueness and precision) of a dual-structured light facial scanner and interexaminer reliability. J Prosthet Dent. 2020;124(5):567-574.
[Objective]
The aim of this study was to evaluate the accuracy of facial scans based on skin color using three different scanning systems.
[Method]
Three head mannequins, identical in shape and varying in skin color (light, tan, and dark groups), were scanned with an industry-standard handheld 3-dimensional (3D) scanner, a stationary dental facial scanner, and a tablet-based scanning application (n=10). Analyses were conducted for 3D surface deviations of both the entire face and the lip area separately, as well as for linear deviations between facial landmarks. For the surface deviation analysis, the industry-standard scanner was used as a reference. In the case of linear deviation analysis, manually measured values obtained using a vernier caliper were used as the reference. Deviations were calculated using 3D software programs. One- and two-way analyses of variance, Kruskal-Wallis H test, and Mann-Whitney U test were used for statistical analyses (α=.05).
[Results and Discussion]
In the analysis of surface deviation for facial scans, the light group exhibited significantly lower deviation compared to the dark group. For the lip area data from the dental facial scanner, there was a significant decrease in deviation with lighter skin tones. In linear measurement analysis, the stationary dental facial scanner demonstrated accuracy comparable to the industry-standard handheld 3D scanner, with no significant difference, and both were more accurate than the tablet-based scanning application, except the intercheilion distance.The accuracy of facial scans was generally higher in light skin color compared to those with darker skin. The dental facial scanner demonstrated greater accuracy than the tablet-based scanning application.
[References]
1) Amezua X, Iturrate M, Garikano X, et al. Analysis of the impact of the facial scanning method on the precision of a virtual facebow record technique: An in vivo study. J Prosthet Dent. 2023;130(3):382-391.
2) Piedra-Cascón W, Meyer MJ, Methani MM, et al. Accuracy (trueness and precision) of a dual-structured light facial scanner and interexaminer reliability. J Prosthet Dent. 2020;124(5):567-574.