陳畊仲醫師 Dr Ken-Chung CHEN
Facial asymmetry
is quite a challenge for us oral and maxillofacial surgeons due to complex
facial bone anatomy and no accurate prediction tool so far. In order to solve
problems on traditional 2D planning method, many digital simulation systems
with 3D CT image are developed in recent times, but still some problems in these
systems. First, no objective, true symmetry plane (or midsagittal plane) is
found and symmetry plane in current simulation systems are created subjectively
by operator. Second, no sensation of occlusal contact in virtual 3D image.
Third, the degree of asymmetry simulation of correction were still landmark-based
calculation and cannot avoid possible human error.
Our laboratory
develops a brand new method and digital system for asymmetry diagnosis and
surgery simulation. We find the optimal symmetry plane by computing and it is a
true objective midsagittal plane. Then we determine the asymmetry by
voxel-based calculation and we can have a definite percentage for asymmetry.
Lastly, we integrate mounted dental stone model to virtual 3D image by light
tracer, so the 3D image in computer is simultaneously moving with dental model,
then we can have a true occlusal contact on dental model and simulation digital
data in software in the same time.
By this brand
new system, we can have more information to evaluate facial asymmetry and
communicate with patient and orthodontics to build an optimal treatment plan
that fits everyone.
