www.eda-egypt.org • Codex : 53/1910 I.S.S.N 0070-9484 Oral Medicine, X-Ray, Oral Biology and Oral Pathology EGYPTIAN DENTAL JOURNAL Vol. 65, 3427: 3438, October, 2019 * Lecturer of Oral and Maxillofacial Radiology Cairo University ** Lecturer of Oral and Maxillofacial Radiology Bani-suaif University ASSESSMENT OF PROXIMITY OF MAXILLARY MOLARS ROOTS TO THE MAXILLARY SINUS FLOOR IN A SAMPLE FROM THE EGYPTIAN POPULATION USING CONE-BEAM COMPUTED TOMOGRAPHY (HOSPITAL BASED STUDY) Enas Anter * , Yara Helaly * and Walaa Samir ** ABSTRACT Aim: To assess the proximity between the roots of maxillary molars and Maxillary Sinus Floor ‘MSF’ using CBCT in a sample from the Egyptian population. Materials and Methods: Eighty seven CBCT scans of adult Egyptians (29 males and 58 females) involving 135 maxillary 1 st molars, 168 maxillary 2 nd molars and 107 maxillary 3 rd molars, were collected from patients’ data base of Planmeca Promax 3D Mid CBCT machine available at the Department of Oral &Maxillofacial Radiology, Faculty of Dentistry, Cairo University. The vertical relation between MSF and examined teeth roots was assessed on cross sectional CBCT images based on Jung classifcation 2009 Results: In all mesio-buccal “MB’, disto-buccal ‘DB’& palatal ‘P’ roots of the examined teeth, the 1 st molars showed the highest prevalence of class (0) in the 3 roots, while the 2 nd molars showed the highest prevalence of class (3) among both MB & DB roots, and the highest prevalence of class (2) among P roots, fnally 3 rd molars showed the highest prevalence of class (1) among DB roots, and the highest prevalence of class (3) among P roots. There was a signifcant inverse correlation between age and vertical relationship classes of only the frst maxillary molars roots. Males showed higher prevalence of Class (2) and Class (3) while females showed higher prevalence of Class (0) and Class (1) in the 3 rd molars. Conclusion: In the investigated Egyptian subjects, maxillary 1 st molars’ roots are the least close to the MSF compared to the other molars roots, while buccal roots of maxillary 2 nd molars are highly anticipated for MSF invagination. The lower the age is, the closer are the maxillary 1 st molar roots to the MSF, and males’ maxillary 3 rd molars are more frequently approximating MSF than females. KEYWORDS: Maxillary Sinus, CBCT, Maxillary Molars.