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Bảng 9.4. Kết quả của voxel dựa trên phân tích 3-D mô cứng cephalometric Thể hiện lòng một sự phục hồi gonial góc trái. Các uprighting của ramus dọc bên trái Sau khi aussi DO đã dẫn đến autorotation của hàm dưới với GIẢM trước mặt thấp hơn chiều cao. Các hàm dưới GIẢM ramus dọc chiều dài trong quy hoạch và ảo | Case 2 CHAPTER 9 Fig. 9.32. Post-distraction 3-D CT hard tissue surface representations with set-up of 3-D cephalometric hard tissue landmarks. Note uprighting of the left mandibular vertical ramus with good morphology of the left gonial angle.a Frontal view b profile view right c profile view left. 3-D CT patient H.T. 329 Clinical Applications Fig. 9.33. Superimposition of pre-operative and post-distraction 3-D CT hard tissue surface representations using the 3-D cephalometric reference system 3-D CT patient H.T. Table 9.4. The results of the voxel-based 3-D cephalometric hard tissue analysis showed a pleasing restoration of the left gonial angle. The uprighting of the left vertical ramus after DO also led to autorotation of the mandible with decrease in anterior lower facial height. The decrease in mandibular vertical ramus length in both the virtual planning and post-distraction results is misleading. Due to the uprighting of the left vertical ramus by DO the position of the left Gonion landmark changed and moved posteriorly. The length of the mandibular vertical ramus remained however slightly undercorrected patient H.T. Parameter Pre-operative Virtual planning Post-operative Coj-Goj mm 30.81 29.01 29.12 Gol-Pog mm 55.59 61.97 59.95 Col-Pog mm 82.84 85.76 81.70 Gor-Gol mm 73.49 71.17 70.64 Cor-Col mm 84.70 83.22 81.86 ANS-Men mm 53.38 53.26 51.65 S-Go mm 55.12 55.30 56.71 Occl-Pl frontal inclination deg 7.61 5.43 5.01 Md-Pl frontal inclination deg 4.92 0.36 1.54 Gonial anglel deg 165.65 143.43 140.87 330 Case 2 CHAPTER 9 Fig. 9.34. Superimposition of pre-operative green and post-distraction purple 3-D CT hard tissue surface representations a and 3-D cephalometric tracings b using the 3-D cephalometric reference system. Frontal view. 3-D CT patient H.T. Fig. 9.35. Post-distraction clinical frontal view at 1 week after removal of the distraction device. Note good symmetry of the oral commissures and cheek contour. patient H.T. .
