In one-jaw surgery the position of the non-osteotomized jaw will dictate the final position of the jaw that is being moved. In this case computer assisted planning will normally not be performed.
However, in bimaxillary surgery the position of both jaws can be changed in all three dimensions. In these cases computer assisted planning has proven to be a valid alternative to dental model surgery.
As all bony structures can be evaluated in computer assisted planning. It is an invaluable tool when dealing with facial asymmetries involving the ramus and condyle. Furthermore, since soft tissues can be included in the virtual model, midline adjustments can be performed more accurately than with the use of plaster casts.
However, reproduction of the virtual planning in the operating room will require a digital workflow including CAD-Cam, splint fabrication or patient specific plates and cutting guides.