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Abstract Many researches urge the dental clinicians to utilize CBCT technology whenever possible to assess the sinus anatomy and volume more accurately, thereby achieving more predictable results in sinus floor elevation surgery. This study was addressing the reliability of volumetric and linear dimensional measurements of the maxillary sinus using CBCT; prior to implant placement, in comparison to multi-slice CT. Twelve volunteers were enrolled in the research and constituted the study sample. Fifteen records of CBCT images of the maxillary sinuses of these volunteers were included in the current work. All of the patients were referred to a private diagnostic radiology center for multislice CT scanning of the maxillary sinus. CBCT and MSCT raw DICOM data set images were imported to the OnDemand third party software for secondary reconstruction. Automatic 3D superimposition by fusion was carried on using this third party software to assure standardization and reliability of the measurements. Dimensional and volumetric measurements were undertaken form CBCT and CT images, tabulated and statistically analyzed. The statistical analysis of the investigated data revealed that there was no statistically significant difference between the dimensional and volumetric measurements yielded from CBCT and those of the gold standard (CT).CT showed lower mean measurement than CBCT and the mathematical equation calculations of the volume showed statistically significantly lower mean measurement than the thresholding calculation. |