There are several basic model surgery techniques currently being used in the transfer of measurements from the planning stage to the patient at the time of surgery. These include the “anatomically oriented” technique, 1 , 2 , 3 the “key spacer” technique, 4 and the 3-dimensional (3D) virtual surgery computer-based methods. 5 , 6 , 7 , 8 , 9 The articulated plaster model methods give precise assessment of movements in the vertical, anteroposterior, and horizontal planes when properly done and this allows assessment of the more complex movements of “pitch” and “roll” ( Fig 1A,B). However, the lack of a static reference point on the model base during rotational movements, within the horizontal plane, means that “yaw” ( Fig 1C) (lateral motion when viewed in the axial plane) is very difficult to assess. 10 This can lead to unwanted flare of the mandibular angle and potentially excessive rotational movements of the condyle in the glenoid fossa after rigid fixation. In essence, at the site of the sagittal split surgical site, this does not afford optimal proximal/distal mandibular relationships. 3D computer planning programs allow the yaw to be visualized but as yet, there is no method of detecting this in model surgery.
https://www.joms.org/article/S0278-2391%2810%2901587-9/abstract
이 글은 네이버 블로그에서 가져온 글입니다. 원문: blog.naver.com/surgeon
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