Fig 1.
Cranial base registration of preoperative and postoperative CBCT images (case no. 21).
3D preoperative and postoperative models (A). Registration of preoperative and postoperative CBCT models (B).
Fig 2.
Accuracy of the cranial base registration in the color map of distance between the registered pre- and postoperative CBCT images (case no. 21).
Fig 3.
Definition of face regions of interest.
The identification of cephalometric landmarks in the 3D soft model and the border of face regions (A). The frontal view of 10 isolated face regions (B).
Table 1.
Definition of 3D soft tissue landmarks.
Table 2.
Definition of the 10 isolated face regions of interest.
Fig 4.
Volumetric difference of isolated soft and hard tissue regions.
Registered CBCT models (A), the volumetric differences after orthognathic surgery (B), the overall volumetric difference divided into 10 isolated regions based on the constructed planes (C), and 10 isolated regions of soft tissue and hard tissue (D).
Fig 5.
Volumetric difference and average movement of soft and hard tissue for chin region.
The model of volumetric change (A), volumetric difference (B), and average movement (C).
Fig 6.
Horizontal trend of average movement ratio of 10 regions.
Fig 7.
Vertical trend of average movement ratio of 10 regions.
Table 3.
Average volumetric difference, the average surface, and average calculated movement of 24 patients in relevant face region.
Although the paranasal and upper lip region are forward, other areas are mostly backward.
Fig 8.
Scatter plots of the soft tissue average movements with respect to underlying hard tissue average movements for 10 regions; r denotes the correlation coefficient for each plot.
Table 4.
Linear regression model of the soft tissue average movements and underlying hard tissue average movements for the regions.