Biomedical subjects
Publications and source records attributed to H I Engstrom.
A rhinolith is an object that has become lodged in the nose and has slowly calcified. It is seen on dental radiographs as a radiopaque object in the nasal fossa and may be confused with several pathologic entities that call for more invasive surgical procedures. A history of unilateral nasal stuffiness, obstruction, and discharge is common but not always present. Two clinically diverse cases are presented.
Magnetic resonance (MR) imaging of the head and neck is becoming an important aid in evaluating pathologic conditions of the brain, midface, and pharynx. Certain dental materials cause artifacts during MR imaging of the lower midface. These artifacts can obscure the normal anatomy. This study describes the degree of artifact production caused by various materials commonly used in dental restorations. Of the materials tested, those causing artifacts were made of stainless steel, such as orthodontic bands used for braces, and pins or posts that are commonly drilled into teeth to provide structure or stability before filling. Materials used as temporary or permanent fillings or crowns--such as amalgam, gold alloy, aluminum, microfilled resin, and polyvinyl acrylics--did not cause artifacts in the images.
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