Abstract：
There are several treatment options to treat a class II dentofacial deformity with a pronounced chin. A total subapical osteotomy is one of these options. This type of osteotomy was refined to total subapical and ramus (TSAR) osteotomy. In this technical note, a detailed and schematic presentation of the TSAR osteotomy is presented step by step. The surgical approach to the TSAR osteotomy is divided into three parts. The first part consists of the horizontal osteotomy at the level of the ramus, the second part approaches the corticotomy to release and protect the mental nerve and the third part consists of connecting the horizontal ramus osteotomy and the local corticotomy around the mental nerve. In this third part, it is important that the inferior alveolar nerve (IAN) is actively sought and protected.
摘要：
有几种治疗方法可以治疗具有明显下巴的II类牙面畸形。完全根尖下截骨术是这些选择之一。这种类型的截骨术被细化为全根尖下和支（TSAR）截骨术。在本技术说明中，逐步介绍TSAR截骨术的详细示意图。TSAR截骨术的手术方法分为三个部分。第一部分包括在支的水平截骨，第二部分采用皮质切开术来释放和保护精神神经，第三部分包括连接水平支截骨和精神神经周围的局部皮质切开术。在这第三部分,积极寻找和保护下牙槽神经(IAN)是很重要的.
