Abstract: Objective　To investigate the character of iconography, classification and treatment in sagittal saw fracture of maxilla. Methods　The maxillary bones were measured with 3-dimensional (3D) CT to distinguish the types of fracture and therapy. Results　The study group consisted of 42 patients with maxillary bone fracture. Types Ⅰ: 30 cases of sagittal saw fracture line from palatine process, alveolar process to basis nasi, and they always had maxillary bone transverse fracture. TypesⅡ: 8 cases of fracture line from palatine process, alveolar process and basis nasi to orbital wall. Types Ⅲ: 4 cases of fracture line from palatine process, alveolar process upwards through maxillary bone surface and arrived paries inferior orbitae, and 4 patients have shown occlusal premature contact and interdental space gap has appeared in 3 patients. Conclusion　The maxillary bone sagittal saw fracture could appear in the center or by center's side and there are three types in iconography. TypesⅠ,the fracture lines from palatine process, alveolar process upwards to basis nasi or piriform aperture border and they always had maxillary bone transverse fracture. TypesⅡ, the fracture lines from basis nasi, piriform aperture border or frontal process to paries inferior orbitae or paries medialis. Types Ⅲ, the fracture lines from alveolar process upwards through maxillary bone surface and arrived paries inferior orbitae.

Key words: Maxillary fractures, sagittal fracture, 3-dimensional (3D) CT, classification