Physics, Techniques and Procedures
examination of the parotid or submandibular glands after injection of contrast medium into the duct system. Nonionic water-soluble contrast media (350 mg iodine/ml) are preferred. Plain films similar to the post-contrast views (see below) should be taken prior to contrast medium injection for demonstration of calculi
. A dental film placed in the buccal sulcus outside the upper molar teeth at the parotid duct orifice may also be beneficial. The procedure is performed with the patient supine
. The salivary duct orifice is first explored and dilated with metal probes (e.g. lacrimal probes). For contrast medium injection, several devices exist, including flexible cannulae with finely drawn-out tips, and metal-tipped catheters. Injection of contrast medium is performed slowly with a 2 ml syringe, and the injection is stopped when the patient feels discomfort, or after an injected amount of 1 ml. Post-contrast radiographs include oblique lateral (Fig.1
) and true lateral views, a posteroanterior view for the parotid gland or a mandibular occlusal radiograph for the submandibular duct. Excellent views may also be obtained with dental panoramic equipment (pantomography
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Oblique lateral projection of normal submandibular sialogram.