<ORIGINAL ARTICLE>Reduction of Exposure Dose from Dental Film Packs with Fluorecent Screen

Abstract

P(論文)Dental film packs with fluorescent screens were made experimentally for the purpose of reducing the exposure dose and to conduct a quantitative analysis on the definition of radiographies taken with these materials. The type of screens were divided into (a) high resolutive type I, (b) high resolutive type II and (c) high sensitive type. The results obtained were as follows; (1) Compared with traditional dental films, the exposure dose could be decreased to 1/8.6 with high resolutive type I,1/14.9 with high resolutive type II and 1/55.8 with sensitive type. (2) In diagnosing, the definition with high resolutive type I and II were sufficeint in the case of routine examinations. The high sensitive type was inferior in resolution compared to high resolutive Type I and Type II. But this type was useful in the case of survaying without the necessity of high resolutive exposure, (3) Manufacturing costs of these materials are more expensive than the traditional ones, but should decrease in price when mass production can be carried out. (4) In the future, it will become necessary to stress the importance of decreasing the exposure dose since the image qualities are not improved to such a great extent.departmental bulletin pape