الفهرس 
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Abstract
Non-tumour salivary gland diseases are the most common diseases in adults , symptoms of salivary gland disorders are limited in number and generally nonspecific as Patients usually complain of swelling, pain, xerostomia, foul taste, and sometimes sialorrhea (excessive salivation).
Obstruction is not only the most common cause of chronic inflammation of the salivary glands but is also the most common condition to affect them, Non-inflammatory conditions of the salivary glands include any non-inflammatory, non-neoplastic condition of the salivary glands. Most of these conditions result in secretory abnormalities, namely xerostomia.
Although a thorough history and complete physical examination are crucial steps in the diagnosis and evaluate treatment of any salivary gland disorder, diagnostic imaging plays a pivotal role in the diagnosis of patients with salivary glands disorders, it can provide vital information about the nature of the abnormality, its cause, the extent of glandular involvement, and the effect on the adjacent surrounding structure.
The major salivary glands can be explored using a significant number of imaging procedures to explore the salivary ductal system: ultrasonography, CT, MRI and sialography. Each of these radiological procedures has benefits and disadvantages.
Sialography relies on the injection of contrast medium into glandular ducts so that the pathway of salivary flow can be visualized by plain-film radiographs as it is the functional examination of major salivary glands.
Plain imaging has been used extensively with sialography; however the two-dimensional images that are generated may have limited diagnostic capability.
CBCT overcomes many of the shortcomings of other imaging modalities and offers unique advantages such as isotropic voxel resolution, soCBCT to establish a salivary ductal map with a precise location of the lesions.
This study was aiming to evaluate major salivary glands in patients with chronic inflammatory and non-inflammatory condition by Cone Beam Computed Tomography Sialography.
Twenty patients with suspected obstructive condition of a parotid or submandibular gland were included in this study; all patients were selected from the Out Patient Clinic of faculty of dentistry Minia University Hospital. The patients were of both sexes and varying ages from 22 to 70 years old, with mean age of 46 years old, all cases were subjected to history taking, thorough clinical examination following a standardized protocol and a radiographic imaging using a conventional sialography (panoramic radiography) and cone beam computed tomography sialography.
The result of this study showed that there was statistically significance difference between CBCT and the conventional sialography in the visualization and detection of abnormalities of the main duct and the detection of sialectasia of the parychema.
As well as ,there was a correlation between CBCT findings regarding to ductal &parenchymal finding and common clinical symptoms such as pain ,swelling at meal time ,xerostomia and the presence of systemic diseases ;but both are important in the evaluation of non-tumor lesions of salivary glands.
CBCT sialography is feasible, safe, and better than plain film sialography in mapping the delicate ductal structure of salivary glands as well as there was correlation between CBCT sialography finding and some clinical symptoms.