. Elementary and dental radiography / by Howard Riley Raper . ing plane. The angle of the film in Figs. 87, 89 and 91 is what it would be in theaverage mouth. Suppose, however, the vault is very flat. In such anevent the angle of the X-rays as illustrated in Fig. Sy to be correct, wouldcause a marked lengthening of the shadow, as illustrated by the dottedlines and drawing in Fig. 92. The angle of the X-rays should be as inFig. 91 to avoid, as nearly as possible, any distortion. (Notice in Fig. 92that the bending of the film would cause a lengthening of the shadow.) MAKING DENTAL RADIOGRAlllS 1
. Elementary and dental radiography / by Howard Riley Raper . ing plane. The angle of the film in Figs. 87, 89 and 91 is what it would be in theaverage mouth. Suppose, however, the vault is very flat. In such anevent the angle of the X-rays as illustrated in Fig. Sy to be correct, wouldcause a marked lengthening of the shadow, as illustrated by the dottedlines and drawing in Fig. 92. The angle of the X-rays should be as inFig. 91 to avoid, as nearly as possible, any distortion. (Notice in Fig. 92that the bending of the film would cause a lengthening of the shadow.) MAKING DENTAL RADIOGRAlllS 103 Just in proportion as the vault becomes more flat the film departsfrom the vertical and the tube must be at a different and higher so, inversely, as the vault is higher the film may be placed morenearly parallel with the teeth and the tube may be lowered. From the foregoing it will be understood why we can never be surethat our radiograph gives the exact length of upper teeth. By making slight changes in the positions of the film as illustrated. Fig. 93. Position of film in the mouth for radiographing upper anterior teeth. See pose Fig. 94. in Fig. 85 and the tube as illustrated in Fig. 86. all of the teeth from thethird molars forward to the cuspids (and in some mouths the laterals)can be radiographed. Figure 93 illustrates the position of the film formaking radiographs of the upper anterior bending of the films is to be avoided as faras possible, because it causes distortion of the radiographic image, when Pose for the UpperAnterior teeth. 104 DENTAL RADIOGRAPHY
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