A hydraulic maxillary sinus lift should be referred to as a maxillary sinus lift, which usually focuses on procedures that can effectively increase the height of the maxilla and are produced under the guidance of a medical professional. Maxillary sinus lift is mainly used in cases where the height of the maxilla is insufficient, and due to the fact that the implants cannot be effectively embedded or are poorly retained, the height of the maxilla can only be increased by maxillary sinus lift, implantation of bone powder or bone block, which is further categorized into maxillary sinus fluid lift and external lift. The procedure can be further divided into maxillary sinus lift and external lift. The internal lift is performed by removing the bone from the maxillary sinus floor through ultrasonic bone knife, thus lifting the maxillary sinus floor; the external lift is mainly used in cases where the height of the maxilla is extremely insufficient, and the maxillary sinus floor is lifted by opening the window from the outer wall of the maxillary sinus.