Dentistry: X-Ray Safety

At the American Dental Association convention in Dallas, there was disagreement over something that patients have long taken for granted: the safety of dental X rays. Although the A.D.A. has been encouraging the use of safer X-ray machines for years, many devices of antique design still adorn countless offices. Some have not even been equipped with an electronic timer, available since 1955, to go with the use of high-speed film and cut the exposure time to a fraction of a second. The vast majority still have, at their business end, a plastic cone three or four inches long. This...

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