. Radiografia elementare e dentale. D la radiografia fatta da questa posa. Le radici è perché il fihn non è stato premuto do^vn; abbastanza lontano, o thetube non era abbastanza basso. Le differenze sHight in, thp^po^s alle macheradiografie dei denti anteriori e dei terzi molari dalla poseshown in Fig. 91 sono evidenti. :, f ij;; con il film posto nella bocca come in Fig. 89, tranne che con il lato di film che si presenta verso il basso invece che con i denti superiori, ed una posa come da Fig. 92, le radiografie dei denti inferiori possono scemare. FARE RADIOGRAFIE DENTALI 97 la distanza del tubo è p
1445 x 1730 px | 24,5 x 29,3 cm | 9,6 x 11,5 inches | 150dpi
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. Elementary and dental radiography . d the radiograph made from this pose. the roots it is because the fihn was not pressed do^vn; far enough, or thetube was not low enough. The sHght differences in, thp^po^ses to makeradiographs of the anterior teeth and the third molars from the poseshown in Fig. 91 are apparent. :, , f Ij;; With the film placed in the mouth as in Fig. 89, -except with thesensitive side of the film presenting toward the lower instead of the upperteeth, and a pose as per Fig. 92, radiographs of the lower teeth may bemade. MAKING DENTAL RADIOGRAPHS 97 The distance the tube is placed from the film Distance Between is about 12 to 20 inches, measurements taken from Cube and Patient. the target of the tube. A good rule to follow is to place the tube so that there is a distance of about 8 inches between the glass of the tube and the patients face. If, as is almost invariably the case, a 6-inch tube is used, this makes the distance between the target and film al)out 12 to 13 inches. 1 never have the glass of the. Fig. 90. Position of the film in the mouth for making radiographs of the lower molar and Ijicuspid region. tube closer than 6 inches from the face. A tube of medium vacuum mustbe brought a little nearer to the film than one of high vacuum if the samelength of exposure is to be made, because the X-rays from it are notso penetrating. The advantage in having the tube as far away as possi-ble lies in the fact that both the patient and film are then more nearlyout of range of the soft, secondary rays. These rays may burn the pa-tient (set up a dermatitis) and fog the film. In most works on radiography the writers advise 18 inches as theproper distance between target and fdni. I believe this to be needlessly *Eight inches between the glass of the tube and the patients face, plus threeinches the distance from the glass of the tul)e to the target, plus one to two inchesthe thickness of the maxilla and overlying parts, equals twelve to thirteen inchesthe d
