In February 1896 a child who had been accidentally shot in the head was brought to the laboratory at Vanderbilt University (Tennessee, USA). Fritz Giesel later died in 1927 of metastatic carcinoma caused by heavy radiation exposure to his hands. For many years the laboratory provided practitioners with images of the jaw and head. In 1896, Otto Walkhoff and Fritz Giesel established the first dental roentgenological laboratory in the world. He noticed a loss of hair on the side of the head of some of the patients he irradiated, 2 but as there was no mention of blisters on the skin it is assumed that the absorbed dose was less than 300 rads. Later, in 1896, Walkhoff succeeded in making extra-oral pictures with an exposure time of 30 min. 1 However, the exact nature of this torture has not been described. Walkhoff said that those 25 min of exposure were a torture to him. He took an ordinary photographic glass plate, wrapped it in a rubber dam, held it in his mouth between his teeth and tongue and then lay on the floor for a 25 min exposure. It was barely 14 days after the announcement of the discovery of Roentgen rays that Friedrich Otto Walkhoff took the first dental radiograph.
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