Abstract: Objective： The purpose of this study was to determine the anatomical structure of maxillary sinus septa using cone beam computed tomography(CBCT) and assess its prevalence and location for maxillary sinus surgical interventions. Methods： Maxillary sinus images of 248 patients who underwent CBCT scan in Sichuan Provincial Hospital between September of 2017 and September of 2018 were collected. This study was to investigate the relationship between the anatomical variations of maxillary sinus septa and conditions of gender, location and absence of teeth. Results： There were a total of 248 patients(male 144, female 104),and the prevalence of maxillary sinus septa was 27.42%. Among the 248 patients, there were 36 patients with one maxillary sinus septa(14.52%), 28 patients with two sinus septa(8.87%), 4 pa- tients with three sinus septa(2.42%). The location of septa observed in all study groups demonstrated a greater prevalence(51.92%) in the molar region than in the pre-molar and post-molar region, which re- spectively were 24.0% and 22.0%. The average height on the sagittal plane was(6.20±2.82)mm to the left, while the right side is(5.83±1.80)mm. The percentage of bone crest in female was 26.47% and that in male was 73.53%. There was a statistical difference between male and female in maxillary sinus bone crest(P<0.05). At the same time, this study showed no statistically significant differences regard to loca- tion, but to gender. Conclusion： Septa of various heights and courses developed in all parts of the maxil-lary sinus. Therefore, to prevent possible complications during sinus surgery,CBCT is a good choice to observe the septa in maxillary sinus.

Key words: maxillary sinus, septa, CBCT, implant