الفهرس 
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Abstract
The presence of an odontogenic infection related to the posterior upper molars
endangers maxillary sinuses, because of the close anatomical proximity of the maxillary molars
with the maxillary sinus floor. Up to our knowledge that the presence or absence of an
interrelation between the periodontal bone loss and Schneiderian membrane increased thickness,
as well as maxillary mucosal cysts, is sparse.
Aim of the study: So, this research focused on exploring the interrelation between the alveolar
bone phenotype surrounding maxillary molars in periodontitis patients and the increase in
maxillary mucosal thickness, together with antral cysts appearance; using cone-beam computed
tomography scans.
Materials and Methods: Data from 83 CBCT scans were investigated for: the subject’s age,
gender, maximum alveolar horizontal bone loss, presence of vertical bony defects, minimum
remaining alveolar bone height, presence and percentage of root projection within the antrum,
maximum mucosal thickness, and presence of mucosal cysts within the sinus.
Results: Our results showed a statistically significant correlation between maximum mucosal
thickness and each of the following: age, maximum alveolar horizontal bone loss, minimum
remaining alveolar bone height, and presence of a root projection into the antrum as well as its
percentage. Additionally, a non-significant correlation was detected between mucosal cysts of the
antrum and any of the study variables.
Conclusion: We concluded that Schneiderian membrane thickness is affected by the horizontal
alveolar bone loss around maxillary molars. Additionally, the maxillary mucosal cysts’
appearance within the antrum doesn’t correlate in any manner to the periodontal condition of
maxillary molars.