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Background: Understanding the anatomical and pathological relationship between posterior teeth or edentulous area with maxillary sinus is essential for diagnosis and treatment planning. This study aimed to assess the correlation between maxillary sinus floor topography and related root position of posterior teeth. Method: 55 panoramic images were selected through census. These images were chosen from sajad oral and maxillofacial radiology and Navab Azam oral and maxillofacial surgery clinic in yazd from 2001-2015. Totally, 440 first and second premolars, maxillary, first, and second molars(from each 110) were investigated. The interpretation of CBCT scans were performed by oral radiologist specialist and also panoramic radiography and the results were carried out by a trained senior dental student. The results were repeated two weeks later to investigate intra-observer. The collected data were analyzed using SPSS version 17 and, Anova, Chi square, Fisher, Exautts and t-test. Result: The agreement between the CBCT and panoramic radiographs in determining root form was measured with Kappa test and it was kappa=0.549, which was meaningful with P-value=0.0001. This meaned that CBCT and panoramic radiographs showed an agreement in determining the position of maxillary sinus floor and posterior teeth roots. According to the results of this study, it was recommended to establish the exact correlation between maxillary sinus floor and posterior teeth roots especially in classification 3(projected in panoramic radiographs)CBCT images were prepared for minimal damage and infection transmission.

Keywords: Maxillary sinus floor, Maxillary posterior teeth, Panoramic, Cone Beam CT, Topography

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