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上颌骨因肿瘤切除后，常会造成牙列缺损和部分上颌骨缺损，严重影响患者的语言、吞咽、咀嚼等生理功能．术后采用低位中空阻塞器的预成赝复体可以保护创面及防止感染，减少软组织的挛缩，恢复吞咽功能，防止发音改变，及时恢复面部外形和对患者心理起安慰作用．低位中空阻塞器体积小易于就位，不会因张口受限而无法就位，其重量轻，对基牙的扭力小，阻塞器位置低避免了擦伤手术创面使创面难以愈合．
Due to tumor resection of the maxilla, it often results in dentition defect and partial maxillary defect, which seriously affects the patient's language, swallowing, chewing and other physiological functions. Postoperative use of low hollow obstruction preformed prosthesis can protect the wound and prevent infection, reduce soft tissue contracture, restore swallowing function, prevent changes in pronunciation, timely recovery of facial shape and psychological comfort to patients. Low Hollow Catheter Small and easy to place, will not be limited due to the opening can not be in place, its light weight, the torsion of the abutment is small, low position of the occluder to avoid scratching the wound to wound surgery difficult to heal.