The anatomical structure of the maxilla can be categorized into one body and four protrusions, one referring to the maxillary body, and the four protrusions being the frontal, zygomatic, palatal, and alveolar protrusions. The maxilla is located in the middle of the face, with one on each side, symmetrical to each other. The shape of the maxilla is irregular and can be divided into four protrusions: 1. Maxillary body: outside the anterior surface there are infraorbital foramen and cuspal fossa; behind there are zygomatic alveolar ridge, alveolar foramen and maxillary tuberosity; above there are infraorbital canals; the inner surface is involved in the composition of the lateral wall of the nasal cavity. 2. Frontal protuberance: it is connected with the frontal bone, nasal bone and lacrimal bone, and participates in the composition of the tear trough. 3. Zygomatic protuberance: it is connected with zygomatic bone. 4. Palatine process: it connects with the opposite palatine process in the midline and constitutes the hard palate. 5. Alveolar process: the maxillary alveolar process on both sides of the alveolar bone meets in the midline, forming the alveolar arch.