. Elementary and dental radiography / by Howard Riley Raper . d side-ways from the tube which accomplishes the same thing. With the film placed in the mouth as shown in Fig. 99 the pose formaking radiographs of the lower cuspids and bicuspids is illustrated inFig. 100. Note that the rays are directed dwfo-lingually and slightly upward. MAKING DENTAL RADIOGRAPHS 107 Figure 101 shows the film packet placed in posi-Poses for the Cower tion for ra(iiographing the lower anterior that about ten millimeters of the packet is bentabruptly backward. This is done because the packet is too wide
. Elementary and dental radiography / by Howard Riley Raper . d side-ways from the tube which accomplishes the same thing. With the film placed in the mouth as shown in Fig. 99 the pose formaking radiographs of the lower cuspids and bicuspids is illustrated inFig. 100. Note that the rays are directed dwfo-lingually and slightly upward. MAKING DENTAL RADIOGRAPHS 107 Figure 101 shows the film packet placed in posi-Poses for the Cower tion for ra(iiographing the lower anterior that about ten millimeters of the packet is bentabruptly backward. This is done because the packet is too wide for thedental arch and it is better to bend back a part of the film abruptly, andso allow the film to go to place, than to bend the entire film in an effortto get it into a space too narrow for it. A little cotton between the filmand inner surface of the dental arch sometimes helps in preventing unduebending of the film. Figure 102 is the correct pose for making radiographs of the loweranterior teeth with the film in the mouth as per Fig. 101. Owing to the. Fig. 97. Position of the film in the mouth for radiographing the lower molars. See pose Fig. 9S. difficulty in placing the film parallel with the teeth, without bending thesurface of the film too much, it is usually necessary to tip the head back-ward and direct the rays upward and lingually in order to make the apicesof the roots show in the radiograph. With the film placed in the mouth as shown in Fig. 95, except thatthe sensitive side presents toward the lower teeth, a radiograph may bemade from the pose shown in Fig. 103. Such a radiograph is liable togreat distortion. A study of Fig. 104 will assist the operator materially in directing therays through the parts at the proper angle. From this illustration onecan promptly see why the shadow of the mesiobuccal root of upper molarsis usually thrown to the mesial of the lingual root, while the shadow of io8 DENTAL RADIOGRAPHY
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