No relationship was observed between a patient’s age and the presence of partial or complete obliteration of at least one maxillary sinus (Fig. 6, p = 0.92). Patient’s age and the mean osseus sinus volume were also not associated significantly (Fig. 7, p = 0.20). Both maxillary sinuses (osseus borders) of each patient were quite similar in size (mean difference between left and right 0.5 cm³), yet statistically significant with slightly larger volumes on the left side (p = 0.045). Men were found to have a statistically significant higher mean osseus volume (19.0 cm³) than women (15.5 cm³) (Fig. 8, p = 0.007). No significant association between bilateral obliteration and the date of the CBCT scan (autumn/winter versus spring/summer) could be found (p = 0.41). Further, no significant association between unilateral obliterated sinuses and apical radiolucencies was found (p = 1).