Accuracy of virtual 3-dimensional cephalometric images constructed with 2-dimensional cephalograms using the biplanar radiography principle

Abstract

Purpose The purpose of this study was to evaluate the accuracy of virtual 3-dimensional (3D) cephalograms constructed using the principle of biplanar radiography by comparing them with cone-beam computed tomography(CBCT) images. Materials and Methods Thirty orthodontic patients were enrolled in this study. Frontal and lateral cephalograms were obtained with the use of a head posture aligner and reconstructed into 3D cephalograms using biplanar radiography software. Thirty-four measurements representing the height, width, depth, and oblique distance were computed in 3 dimensions, and compared with the measurements from the 3D images obtained by CBCT, using the paired t -test and Bland-Altman analysis. Results Comparison of height, width, depth, and oblique measurements showed no statistically significant differences between the measurements obtained from 3D cephalograms and those from CBCT images ( P >0.05). Bland-Altman plots also showed high agreement between the 3D cephalograms and CBCT images. Conclusion Accurate 3D cephalograms can be constructed using the principle of biplanar radiography if frontal and lateral cephalograms can be obtained with a head posture aligner. Three-dimensional cephalograms generated using biplanar radiography can replace CBCT images taken for diagnostic purposes.

Correlation analysis between radiation exposure and the image quality of cone-beam computed tomography in the dental clinical environment

“… 1 2 CBCT was first applied in the dental field in the mid-1990s, and the scope of its application has been gradually expanded. 3 4 5 According to a 2019 research report in South Korea, CBCT was used 778,766 times in 2019, compared to 399,327 times in 2016. 6 As the usage of CBCT in the dental field has increased dramatically, the importance of equipment management has also been recognized.…”