الفهرس 
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Abstract
Exact assessment of the relationship between roots of maxillary premolars and molars and inferior wall of the maxillary sinus is essential in oral and maxillofacial pathology diagnosis and treatment planning.
The aim of the present work was to assess the vertical and horizontal relationship between maxillary sinus floor and maxillary posterior teeth root tips using Cone Beam Computed Tomography (CBCT).
This study was conducted on 150 maxillary sinus CBCT images. The subjects ranged in age from 20 to 50 years and were divided to 3 groups, 50 subjects in each group A, B and C according to age.
The first and second premolars as well as the first and second molars were assessed for their relation to the maxillary sinus floor.
Subjects involved in this study are divided into three equal groups:
group A: Included 50 female subjects ranging in age from 20 to 29 years old.
group B: Included 50 female subjects ranging in age from 30 to 39 years old.
group C: Included 50 female subjects ranging in age from 40 to 50 years old.
Vertical distances in the present study showed thatthe mesiobuccal root of the second molar is the nearest one to the floor of the maxillary sinus in all age groups followed by the palatal root of the second molar, while the buccal root of the first premolar is the farthest root from the floor of the maxillary.
The horizontal linear measurements showed that the distobuccal root of the second molar is the nearest root to the adjacent maxillary sinus, followed by the mesiobuccal root of the second molarin all age groups.
The present study proved that the maxillary second molar was the most related tooth to the sinus floor regarding the vertical and horizontal relations, while the maxillary first premolarwere the farthest from the sinus floor in the vertical and horizontal relations.
Results of the the current study proved that,the vertical distances decreased with increase in age with a significant values in the buccal root of the first premolar, the palatal root of the first premolar,buccal root of the second premolar and the mesiobuccal root of the first molar while there was no significant differences with increasing age in the remaining maxillary posterior roots.
While regarding to the horizontal measurements, there was also a decrease in the linear measurements related to the buccal root of the first premolar with increasing age with a significant value, while there was no significant differences related to the other roots with increase in age.