ortho - the international C.E. magazine of orthodontics

ortho1_201310 I I C.E. article_ orthognathic surgery Keep in mind that everybody’s head position is a bitdifferent.Thefurtherthatglabellaisfromthetrue verticallinewillaffecthowwelookatthelowerthird of the face. Now we need to establish the axis-horizontal plane (Fig. 8). First, we establish the horizontal posi- tionusingtheearbow.We’llusethepointerontheear bowtomakeamarkonthenosewhenthebowislevel. We have previously established, through axio- path tracing, the hinge axis position on the patient’s rightandleftsides.Incombiningthehorizontalpoint with the two axis points, the axis-horizontal plane can be established. The axis-horizontal plane is then transferred to the articulator. This allows us to ori- entate the CBCT data with the articulator mounting. Now we have the true axis-horizontal plane and the true vertical line combined, and now facial, skel- etal and functional issues can be assessed. In the example we are using, the patient has a mandible that has an architecture problem, which causes her to occlude only on the molars with an anterior open bite. Fig. 8_ Establish the horizontal position. Fig. 9_Surgical treatment objective. Fig. 10_Completed the extrusion of the maxillary segment and balanced the occlusal plane. Fig. 11_Establishing the true vertical line. Fig. 12_Shows true hinges access mounting. Fig. 13_Open bite on hinge- axis mounted model. Fig. 8 Fig. 10 Fig. 11 Fig. 9 Fig. 12 Fig. 13