上颌骨缺损伴随多数牙齿缺失及周围组织的缺损,由于口鼻腔穿通使咀嚼、语言、吞咽发生严重障碍,面部塌陷畸形给病人精神上造成很大压力,这些都极大地影响病人的工作、学习和社会活动,因此对修复治疗的心情非常迫切。由于多数牙齿缺失,余牙全在健侧,给卡环固位造成一定困难,颌骨、腭骨缺损使修复体失去支持,基托利用吸附力和大气压力的固位作用也很差,以及缺损区组织脆弱、部分余牙松动、瘢痕收缩张口受限和修复体大而重等因素都给修复体固位带来很大困难。如何增强修复体的固位报告如下。 With the majority of the maxillary defect accompanied by the loss of the surrounding tissue and the surrounding tissue defects, as the mouth and nose piercing to chewing, language, swallowing a serious obstacle, facial collapse deformity caused great mental stress on the patient, which greatly affect the patient's work, learning and Social activities, so the mood for the restoration of treatment is very urgent. Due to the loss of most of the teeth, the remaining teeth are all in the contralateral side, which causes some difficulties in retaining the retaining ring. The jaw and palatal defects lose support for the restoration, and the retention of the base by the adsorption and atmospheric pressure is also poor. Defective tissue fragility, part of the remaining loose teeth, scar contraction and mouth restriction and large and heavy restorations and other factors have given prosthesis retention has great difficulties. How to enhance the retention of prosthesis is reported below.