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Evaluating the accuracy of facial models obtained from volume wrapping: 2D images on CBCT versus 3D on CBCT

Published:October 10, 2018DOI:https://doi.org/10.1053/j.sodo.2018.10.008

      Abstract

      Purpose: To test for difference in accuracy of 3D facial integument measurements of three indirect facial measurement techniques compared to measuring integument facial features directly. Materials & Methods: Four measurement methods were used to measure 25 patients (15 females and 10 males): 1) direct anthropometric facial (direct), 2) volume wrapping 2D images on CBCT (2D wrap), 3) volume wrapping 3D facial scan using Artec Eva on CBCT (3D wrap), and 4) direct 3D face scan (3D scan). Statistical differences were determined at the 99% probability level and clinical significance was >0.5 mm. Results: Direct technique measurements were significantly smaller than the other three techniques in 7 of 26 (26.8%) measurements. Differences between 3 of 7 measurements exceeded 0.5 mm and were deemed clinically significant, i.e. upper face height (N-Sto), lower face height (Sn-Gn) and nasal tip projection (Sn-Prn). The remaining 23 of 26 direct measurements could be substituted by 2D wrap, 3D wrap or 3D scan measurement techniques. Compared to the direct technique, 2D volume wrap on CBCT values were closer than the values obtained from the 3D volume wrap and 3D CBCT techniques. Conclusions: Compared to the “gold standard” direct measurements, the other three techniques in 23 of 26 face and ear measurements (88.5%) could be substituted one for the other, and demonstrated a fairly high level of precision.
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