In order to three-dimensionally evaluate the morphologic charcteristics of the maxilla in patients with jaw deformities, the accuracy of measurement on three-dimensional images on CT (3-D CT) scans as well as the appropriate CT values for the depiction of the morphologic characteristics of the maxilla were examined. As for the accuracy of measurement of three-dimensional images on CT scans, the difference between the mean value of the measured length and that of the image was 1.5 mm at maximum and 0.4 mm on average.
In addition, no difference was observed in the accuracy of measurements on images taken from the coronal and horizontal directions.
The results suggest that the measurement of distance on three-dimensional images is relatively accurate and efficient for measuring the morphologic characteristics of the maxilla.
