對於下顎骨突出、前牙錯咬的第三級咬合不正，我會仔細分析模擬圖後告知外觀改善的幅度，在有限的情況底下，許多案例也許可以以較為輕鬆的不靠手術解決。在此分享快速矯正完成的案例，由治療計畫擬定，收集資料，至完成給予維持器，短短12月完成。
Many protrusive lower jaw with anterior crossbite patients might deny surgical orthodontic treatment. However, I'd like to clarify that "pure orthodontic treatment" alone can't change the lower jaw itself, but affect the contour of the alveolar bone that cover the teeth. The following case was done by pure orthodontic treatment without extraction any tooth. The whole treatment process includes the data collection and delivery of the retainer is with 12 months.
由於牙齒的移動事實上只能影響周圍的齒槽骨，而非下顎骨本體，所以下顎骨的最凸點無法改變，而該處骨頭的突出常常是造成下顎前牙不適合移動到太後方的位置，容易造成下巴比例變得過於明顯。讓我不得不停留在『最和諧、最對稱』的位置，而非將牙齒後移至最遠處。該病例診斷分析後，並無拔除任何牙齒，採用預期性的全齒列移動，包含上顎前牙，因為全齒列移動，我才能將擁擠的上顎齒列排整齊，而沒拔牙齒。許多醫師會認為改善下顎牙齒錯咬已經非常棒了。但我不這麼認為，唯有根據臉型而擬定的上下牙齒全齒列移動，也才能改善對病患本身最重要的鼻唇角大小、微笑、角度和唇下顎角，做到矯正零缺點。
Since the orthodontic treatment only can modify the dentoaveolar bone, the most prominent point of the mandible can't be changed and it's always the main role that affects me to decide where the lower anterior teeth are when considering the harmony and symmetry. The upper anterior teeth also need to be distalized totally, in oder to control the angulations. Many doctors will think push back the lower teeth is good enough for the patient's facial profile. However, I don't think that way. Moving the both arch back according to the face is very important for the patient's esthetic and smile. Then, we can call it the best result.
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