Özet:
Purpose:We aimed to evaluate the accuracy and validity of conventional manual
prediction method (CM) and 2-dimensional and 3-dimensional (3D) soft tissue
prediction methods for Class III bimaxillary orthognathic surgery patients.
Methods: Twenty skeletal Class III patients were included in this study. Soft tissue
prediction was achieved with a traditional manual technique, 2-dimensional
software (Dolphin Imaging, version 11.5), and 3-dimensional software (SimPlant
Master, version 16.0) on preoperative lateral cephalometric radiographs and cone
beam computurized tomography (CBCT) images and then compared with postoperative
lateral cephalometric radiographs obtained at least 6 months after surgery
(mean, 11.5 ± 6.77 months). Forty-eight measurements were done to determine
the reliability of the methods.
Results: All prediction methods have limited postsurgery prediction accuracy for
the subnasal upper lip area.Most of the differences were not more than 3 mm for
all study groups, except the 3D software, which predicted the upper lip area to be,
on average, 3.08 ± 1.38 mm further back (P < 0.001). Although the conventional
method predicted 20 of 48 measurements similar to the final results, the poorest
predictions were found at the nasal and labiomental areas (P < 0.001). Twodimensional
software predicted 23 of 48 measurements very close to the final results
but made significantly different predictions for the nasolabial and labiomental
angles, labrale superius point, and the chin area.
Conclusions: The 3D method predicted, especially the upper lip area, to be significantly
and clinically incorrect, and its soft tissue prediction was insufficient
compared with the other 2 methods. The 3D software needs to be updated, especially
in evaluating soft tissue A point and upper lip changes after surgery.