. Elementary and dental radiography . Fig. 100. Radiograph made from the pose similar to Fig. 101. The arrow points to an impacted upper third molar. The lack of detail in this, and all radiographs made from a similar pose, is due to a superimposition of shadows—the shadow of one side of the jaw is mingled with the shadow of the other. (Radiograph by A. M. Cole and Raper.) are of course necessary, according to what particular region is to bepictured. The objection to this pose as illustrated is that the part being radio- MAKING DENTAL RADIOGRAPHS 111 graphed is not close enough to the plate. W
. Elementary and dental radiography . Fig. 100. Radiograph made from the pose similar to Fig. 101. The arrow points to an impacted upper third molar. The lack of detail in this, and all radiographs made from a similar pose, is due to a superimposition of shadows—the shadow of one side of the jaw is mingled with the shadow of the other. (Radiograph by A. M. Cole and Raper.) are of course necessary, according to what particular region is to bepictured. The objection to this pose as illustrated is that the part being radio- MAKING DENTAL RADIOGRAPHS 111 graphed is not close enough to the plate. With the apparatus used thepatient could not be posed lying on the side, because the shoulder wouldhave been in such a position that the tube could not have been broughtclose enough to the part. The pose would have been better had the patientbeen lying on the stomach with the head turned to one side and thecheek resting firmly against a plate placed on a book about three or fourinches thick (Fig. 330).. Fig. 101. Pose for tlic radiograph shown in Fig. inii. Note that the patient is covered with rubber matting such as is usedin halls and on stairways. This serves as an insulator to keep the currentfrom jumping to the patients body. In case the current did jump to thebody of the patient a blister would probably be made at the point ofentrance and the shock would be more or less painful, but not dangerous. The tube is of course insulated from the metal of the compressiondiaphragm. An additional precaution to guard the patient against shockis to hook a chain—any conductor, in fact—to the metal of the compres-sion diaphragm and adjusting apparatus and fasten the other end to achandelier, gas pipe or water pipe. With this arrangement, if any cur-rent passes into the compression diaphragm or metal adjusting apparatusIt will follow the chain into the gas or water pipe, and on to where the 112 DENTAL RADIOGRAPHY pipe may lead, until it dissipates itself, eventually reaching the ear
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