Comparison of facial measurement using cone-beam computed tomography and three-dimensional photography

Abstract

© 2017 ACM. The purpose of this study was to determine the equivalence of facial measurement between skin surface images derived from two different three-dimensional scanning systems, cone-beam computed tomography (CBCT), and structured-light system three-dimensional photogrammetry (3D photogrammetry). The study samples consisted of 35 orthodontic patients requiring orthognathic surgery. Image fusions by the registration of a 3D photograph upon a CBCT were performed. Facial landmarks and proportion were calculated on both images and compared. Statistically significant differences were observed at around the eyes, mouth, and lateral face. The non-equivalence was most likely due to the differences in facial expressions and artifacts during image acquisition. Soft tissue derived from CBCT in orthodontic patients appeared to be most likely inaccurate and unreliable for clinical uses. Future midcourse evaluations of soft tissues could be made more accurately with the 3D photogrammetry, providing an alternative method for soft-tissue evaluation with no radiation exposure.