Springer Online Journal Archives 1860-2000
Summary A nationwide survey was performed to ascertain the frequency of and exposure factors used in dental radiography in 8,000 dental clinics and dental departments of general hospitals throughout Japan. The results obtained were as follows: 1. All dental radiography units in use during this survey employed fixed voltages and currents. For the most part, they used a tube voltage of 60 kV, a tube current of 10 mA and a beam diameter of 6.0 cm or less at cone tip. 2. The total dental radiographic exposures in Japan in 1984 was estimated as 100,181,000; consisisting of 90,878,000 intraoral radiographies; 8,265,000 rotational panoramic radiographies; 390,000 intraoral source radiographies; 323,000 cephalographies; and 325,000 other radiographic techniques.
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