Optical tracking-based model surgery for orthognathic surgical planning using a quantifying evaluation method.

Traditional cephalometry with a cast-mounted articulator is a useful and well-established tool for orthognathic surgery 7 planning. However, 2-D planning with dental casts cannot provide 8 comprehensive information on facial bone conditions, especially 9 with regards to symmetry. To plan and predict postsurgical facial 10 symmetry and occlusions, this paper uses an optical navigation system to track the movement of the upper and lower dental models 12 in model surgery. The corresponding movement and the new position of the jawbones are demonstrated in the computer and the 14 symmetry status can be evaluated. Surgical splints can be fabricated from the virtual models and used in surgery. The procedure 16 provides more realistic predictions, which can assist surgeons to 17 better control postsurgical facial harmony.