. Elementary and dental radiography . gloves toprotect the hands. Otherwise the repeated exposure of the hands to therays might prove disastrous. See chapter on Dangers of the X-Rays. Dr. Tousey, of New York, and Dr. Ketcham, of Denver, have de-signed little devices, film holders, for holding the film in the mouth duringits exposure. It has been recommended that a modeling composition impressionof the mouth may be made, a place cut out for the film, which is placedtherein and the impression reinserted in the mouth. This method ofholding films I consider extremely impracticable, because of the
. Elementary and dental radiography . gloves toprotect the hands. Otherwise the repeated exposure of the hands to therays might prove disastrous. See chapter on Dangers of the X-Rays. Dr. Tousey, of New York, and Dr. Ketcham, of Denver, have de-signed little devices, film holders, for holding the film in the mouth duringits exposure. It has been recommended that a modeling composition impressionof the mouth may be made, a place cut out for the film, which is placedtherein and the impression reinserted in the mouth. This method ofholding films I consider extremely impracticable, because of the timeconsumed in unnecessary work and the considerable bending of the film. When using square or rectangular film packets bend the sharp cor-ners to keep them from digging into the tissues of the mouth. When making radiographs of the lower teeth with the film in themouth, as per Fig. 90, the patient should be warned not to swallow duringthe exposure. Movement of the tongue in swallowing would move thefilm. MAKING DENTAL RADIOGRAPHS 99. Fig. 91. Proper pose for making radiographs of the lower molar and bicuspid region, and the radiograph made from this pose. As stated in Chapter l\, tlie length of time oftime of exposure depends on several things. W^ith the coil exposure. capable of giving a fat, fuzzy spark lo inches long, the tube backing up 7 inches of parallel spark andthe distance of the target from the film about 12 inches, the time of ex-posure for an Eastman film will be between 5 and 10 seconds. I have seen tables giving the exact time of exposure for the differ-ent teeth—upper molar teeth so many seconds, upper anterior teeth somany seconds, lower molar teeth so many seconds, and so on—but suchtables are utterly useless. No fixed rules for the length of time ofexposure can be made and adhered to. For example. I had been makinglo-second exposures. I purchased a new tube—the same make tube I 100 DENTAL RADIOGRAPHY
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