. Elementary and dental radiography . f placing the film in the mouth, as in Fig. 80, a larger filmmay be used and placed as in Fig. 88, the sensitive side toward theupper teeth. With the film in this position the patient is instructed toclose the mouth, so holding the film firmly in position. With the filmin such a position either the tube must be placed higher and the raysdirected more nearly straight down; or the head must be tipped down-ward toward the tube, which accomplishes the same result, viz., causesthe rays to strike the film more nearly at right angles. (Fig. 89.) Theradiograph mad
. Elementary and dental radiography . f placing the film in the mouth, as in Fig. 80, a larger filmmay be used and placed as in Fig. 88, the sensitive side toward theupper teeth. With the film in this position the patient is instructed toclose the mouth, so holding the film firmly in position. With the filmin such a position either the tube must be placed higher and the raysdirected more nearly straight down; or the head must be tipped down-ward toward the tube, which accomplishes the same result, viz., causesthe rays to strike the film more nearly at right angles. (Fig. 89.) Theradiograph made on a film held in this position is very likely to be dis-torted. (Fig. 89.) The usual position of the film for taking pictures of the lowerteeth is illustrated in Fig. 90. With the film in this position it shouldbe covered with rubber or oil paper to protect it against moisture. Fig. 91 shows the proper pose for taking pictures of the lower bicus-pid and molar region. If the radiograph does not show the apices of DEXTAL RADIOGRAPHY. Pig, -■. The pose with the film in the mouth, a- in Fig. 88, ami the radiograph made from this pose. the roots it is because the film was not pressed down far enough, or thetube was not low enough. The slight differences in the poses to makeradiographs of the anterior teeth and the third molars from the poseshown in Fig. 91 are apparent. 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 d
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