Abstract: Objective: To observe the anatomical and morphological characteristics of maxillary sinus floor in the population by cone-beam computed tomography (CBCT). Methods: CBCT data of 300 patients who visited the Radiology Department of Hainan Stomatological Hospital were collected, and the patients' maxillary sinus floor was observed and measured by software. Results: The average thickness of the mucosa on the floor of the maxillary sinus was (1.26±1.06) mm, basically centered on <2 mm, which accounted for 87.00% (261/300). The incidence of septum of maxillary sinus floor was 33.67%, of which 52 were males and 49 were females, there was no difference between males and females (P>0.05). Shallow concave sinus floor accounted for 54.33% (163/300), deep concave was 39.33% (118/300), and convex was 6.33% (19/300). The average bone thickness of maxillary sinus lateral wall was (1.34±0.26) mm, mainly concentrated between 1.0-1.5 mm, accounting for 60.67% (182/300). The main location of arterial vessel of the lateral wall were sinus type and intraosseous type, accounting for 37.33% (112/300) and 52.00% (156/300), respectively. Conclusion: The anatomical morphology of the maxillary sinus floor is highly individualized and can be comprehensively and objectively reflected by CBCT. It should be carefully studied and analyzed before surgery so as to avoid possible risks and formulate detailed treatment plan.

Key words: maxillary sinus floor, cone beam CT, anatomical structure