الفهرس 
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Abstract
The aim of this study was to evaluate the usefulness of volumetric computed tomography imaging in the assessment of alveolar bone levels and defects, and compare its diagnostic performance with 2D intraoral digitized bitewing radiography. The study was carried out on fifteen patients with moderate to severe chronic periodontitis. The distances from cemento-enamel junction (CEJ) to the alveolar crest (AC) in horizontal bone loss, and from CEJ to the most apical extension of the bony defect (BD) in angular bone loss were assessed. A comparison in the linear interproximal bone level measurements between digitized intraoral bitewing radiographs and sagittal reconstructed images of MSCT was performed. Furthermore, subjective quality assessment of lamina dura delineation, contrasts, craters, and furcation involvements was performed on both imaging modalities. The results of this study demonstrated no significant difference in the linear interproximal bone level measurements between the two imaging modalities. However, the 3D MSCT allowed for better visualization and measurement of periodontal defects in all directions and areas where the intraoral radiographs were limited. For quality rating, MSCT images showed a better outcome when rating periodontal bone crater and furcation involvements. However, MSCT scored less than the intraoral bitewing images in delineation of lamina dura, and contrast.