Abstract: Objective　To determine the prevalence, location and height of maxillary sinus septa in the patients without upper posterior teeth at one or two sides. Methods: The patients who underwent CBCT scan and without upper posterior teeth at one or two sides in Sichuan Provincial People’s Hospital between January of 2011 and December of 2013 were selected and the prevalence, location and height of the maxillary sinus septa were analyzed. Results: There were a total of 253 patients (male 132,female 121) with 289 sinus, and the prevalence of maxillary sinus segments with septa was 26.09%. The location of septa observed in all study groups demonstrated a greater prevalence (81.82%) in the molar region than in the pre-molar regions. The mean height of septa was 3.87±1.10mm, and no statistically significant differences were observed with regard to gender or age. The distribution of septa in buccal-palate(89.39%) was far more than that in mesial-distal direction(10.61%). Conclusion: Septa of various heights and courses developed in all parts of the maxillary 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 , stomatology