General information: The patient underwent subtotal maxillectomy of the left maxilla for left upper gingival cancer, and did not receive radiotherapy or chemotherapy before or after surgery. He did not receive radiotherapy or chemotherapy before or after surgery. He did not undergo early restoration after surgery, and asked for restoration of jaw bone and dental defects 3 months later. Examination: The left side of the face was collapsed, with an opening of about 1.5 horizontal fingers, and the left buccal mucosa was scarred and contracted. The left maxillary dentition was missing and the corresponding area of the alveolar process and jawbone was missing, and the nasal cavity was connected to the oral cavity. The only remaining teeth in the mouth were the lower anterior teeth, the right upper anterior teeth and the right upper 7. The unilateral maxillary defect had a serious impact on the patient’s masticatory function because of the oral and nasal traffic and food spillage from the nasal cavity. In the past, the prosthesis was usually made with only one model, and considering the skill level of the physician and technician, it was difficult to ensure that the prosthesis fit closely with the surrounding tissues in the masticatory function and close the oral and nasal cavity passages tightly. In this case, the patient’s jaw position was determined by using the remaining teeth on the healthy side, and then the patient was put in the occlusal state by using the individual tray to take a functional final impression, and a composite model was made by using the peri-mold infusion method, on which the teeth were arranged and the denture was finalized. To ensure a tight fit between the abutment and the surrounding tissues in the functional state and to close the oral and nasal passages tightly. In this case, the patient was asked to inflate with water in the mouth after the initial wearing of the prosthesis, and no water was seen to flow from the nasal cavity or to accumulate in the obstruction device. The pseudoprosthesis restored the patient’s facial appearance and made the fullness of the defective side symmetrical and coordinated with the healthy side, which greatly improved the patient’s appearance, psychological status and quality of life. The use of cast bracket prosthesis to repair unilateral maxillary defects is significantly better than the restorations made by traditional methods in terms of retention, support and stability. The clinical application proved that the bracket-type pseudoprosthesis could provide sufficient support and retention, and better restored the patient’s speech, swallowing, sucking function and certain chewing function; the facial appearance was greatly improved, and the aesthetic effect was more satisfactory to the patients.