以非拔牙矯正治療安格式二級齒列擁擠與中線歪斜：病例報告

Non-extraction Treatment for Class II Malocclusion with Dentition Crowding – A Case Report

對正齒列中線和顏面中線是矯正治療的目標之一。本篇病例報告描述一位臉型不對稱的安格式二級咬合不正與齒列擁擠之患者，以骨釘來協助非拔牙矯正治療。利用跨弓線裝置來改正偏頰側位置的上顎第二大臼齒，而這顆牙是導致下顎偏移的原因。透過骨釘，將上顎大臼齒往遠心移動並撐寬牙弓。使用中線橡皮筋和二級橡皮筋來讓牙中線更接近顏面中線。治療結束時，犬齒和臼齒達成一級關係，中線對齊，臉型也趨近對稱。

To coordinate the dental midlines with facial midline is one of the orthodontic treatment goals. This case report presented a case with Class II dentition crowding and asymmetry by non-extraction therapy with the aids of TADs. Transpalatal arch with extension arm was used to correct buccal version of upper second molar which contributed the mandibular deviation. Molar distalization and arch widening were achieved by using TADs. Midline and Class II elastics resulted more correction of dental midlines to facial midlines. At the end of treatment, Class I canine and molar relationships and centered midlines were obtained. Better facial symmetry was also achieved.