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Biomedical subjects

L V Arnold

Publications and source records attributed to L V Arnold.

6 recordsLinked to original sources
PubMed1989

Effect of a decrease of interproximal overexposure of bitewing radiographs on the diagnosis of approximal caries.

In bitewing radiographs the approximal enamel is always overexposed because of the short X-ray beam path in this area. This expectedly leads to a deteriorated detectability of lesions. Abrogation of this overexposure by application of X-absorbing paste in the interproximal space will presumably relieve the deterioration of lesion detection. This principle is demonstrated with aluminum cylinders in which a groove simulates a lesion. The principle is also applied to a phantom head with 0.1- to 0.7-mm lesions in the bicuspids. The resulting bitewing radiographs were scored by dentists, and a lesion detection score as used before was calculated. No score improvement resulted from the relieving of overexposure. This is ascribed to the predominant role of recognition processes in the ability to detect a lesion.

Absorption↗
PubMed1987

The radiographic detection of initial carious lesions on the proximal surfaces of teeth. Part I. The influence of exposure conditions.

The relationship between a number of technical exposure conditions and the diagnostic value of bitewing radiographs in the interpretation of initial proximal carious lesions was evaluated. The most important exposure factors for radiographs are tube voltage, filtration, and exposure time. Tube voltage and filtration were found to have an insignificant influence on the diagnostic quality. Exposure time proved to be the most critical factor in influencing diagnostic quality. The greatest difference in diagnostic quality, however, was caused by differences between observers.

Dental Caries↗
PubMed1987

The radiographic detection of initial carious lesions on the proximal surfaces of teeth. Part II. The influence of viewing conditions.

The relationship between various technical viewing conditions and the diagnostic value of bitewing radiographs on the interpretation of initial proximal carious lesions was evaluated. Modification of illumination from the viewbox, the masking of the viewbox, the surrounding illumination, viewing against a wide light source, and the use of accessories were studied. Modification of illumination conditions was found to have only a slight negative influence on the diagnostic quality compared to standard conditions. The use of accessories can have a more important, positive influence, especially when one is using a magnifying glass or an x-viewer. TV systems produced disappointing results. The observer, however, proved to be the most important variable with respect to the diagnostic quality of the radiograph.

Dental Caries↗
PubMed1985

Radiographic imaging of lymph nodes in lymph node dissection specimens.

A new method of identifying and locating lymph nodes in lymph node dissection specimens using a radiographic imaging technique is described. The specimen is immersed in 96% ethyl alcohol which possesses a radiographic density similar to fat tissue. Even small immersed lymph nodes contrast well with 96% ethyl alcohol. Thus, a radiograph of a nodal dissection specimen, immersed in 96% ethyl alcohol, does not show the interfering projection of variations in thickness of the specimen. Simultaneously, lymph nodes are clearly imaged. Using this procedure, we could visualize 97% of all lymph nodes present in the fat tissue of lymph node dissection specimens, which were dissected free from large radiodense structures like muscle and submandibular glands. Thus, a simple method was established for radiographic documentation of lymph nodes in lymph node dissection specimens.

Humans↗