The mean value of the overall average thickness is 1.60 ± 1.20 mm (males 1.95 ± 1.28 mm and females 1.24 ± 1.02 mm) (Table 1).

The average thickness of the membrane also showed no tendency for differentiation by age group (p = 0.878) (Table 2).

The statistical analysis also shows a clear tendency towards lower values when checking from point AR to point CR and from point AL to point CL, which means that the average thickness of the membrane increases from medial to distal. (p = 0.060) (Table 3).

The average mean value of the angle of the maxillary sinus in cross sections was 73.41 ± 6.89°, revealing high prevalence of moderate-shaped sinuses (average mean angle value 74.65 ± 8.08 for the male group and 72.11 ± 5.17 for the female group) (Table 4).

The angle of the sinus also shows no association with age (Table 5).

On the contrary, it was proven that there is a tendency towards lower angle values in the female group (2.5°on average, p = 0.097). It was also shown that at the points BR and BL, the angles were statistically significantly higher than those at the points AR and AL, of the order of 10 ° (p < 0.001), but at the points CR and CL the difference is of 2.2 ° (p = 0.051). No association between thickness of the membrane and the angle (width) of the current position in the sinus was detected (p = 0.662) (Table 6).