الفهرس 
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Abstract
Objectives. The purpose of study was to correlate the radiographic relationship between the maxillary sinus floor and the roots of maxillary posterior teeth imaged by orthopanthogram (OPG) and Cone-Computed tomography (CBCT). Methods. Panoramic and CBCT radiograph of maxillary premolar and molar teeth from 17 patients were taken. A total of 442 premolar and molar roots were classified according to their radiographic relations to the inferior border of the sinus following Kwak et al classification, as: Class 0 no contact between the root and inferior border of the maxillary sinus; Class 1 roots is in contact with the inferior border of the maxillary sinus; Class 2 roots is projected on the lateral side of maxillary sinus while its tips is outer limits of sinus; Class 3 root tips is projected on the sinus floor and Class 4; inferior border of the sinus enveloping part or all tooth root. The root of teeth were measured according to their projection length on the floor of the sinus for both radiograph. Then relationship between radiographic techniques were analyzed statistically. Results. Roots that did not contact floor of the sinus or contacted it but did not project on the sinus floor (Class 0 and 1) showed a high agreement of 68% to 89% when using two imaging technique. Orthopanthogram (OPG) showed a statistically significant 2.01 times root projection on the floor of sinus in comparison to the roots the root protrusion length into the sinus floor measured by using CBCT images (P <0.0001).Conclusion. Most common was roots projected in the inferior border of sinus in OPG, no vertical protrusion into the floor of the sinus was observed on CBCT. The true protrusion of the roots into the sinus floor on the CBCT showed much shorter than projection length compared with OPG radiograph