. Elementare und dentale Radiographie / von Howard Riley Raper . Abb. 97. Position des Films im Mund zur Röntgenaufnahme der unteren Molaren. Siehe Pose Abb. 9S. Schwierigkeiten beim Platzieren des Films parallel zu den Zähnen, ohne die Oberfläche des Films zu stark zu biegen, ist es in der Regel notwendig, den Kopf nach hinten zu kippen und die Strahlen nach oben und lingual zu richten, um die Spitzen der Wurzeln in der Röntgenaufnahme zeigen zu lassen. Mit dem Film in den Mund gelegt, wie in Abb. 95, außer dass sich die empfindliche Seite in Richtung der unteren Zähne zeigt, kann ein Röntgenbild aus der in Abb. 103. So ein
1456 x 1716 px | 24,7 x 29,1 cm | 9,7 x 11,4 inches | 150dpi
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. Elementary and dental radiography / by Howard Riley Raper . 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. Fig. 98. Pose for radiographing the lower molars with the film in the mouth as in Fig. 97.Radiograph made from this pose. The film holder in use is illustrated in Figs. 331, 332and 333. the disto-buccal is superimposed on the lingual root. (Fig. 105.) Theshadow of the disto-buccal root can sometimes be thrown to the distal ofthe lingual root by directing the X-rays through the part in a disto-mguadirection. When radiographing lower molars it is often necessary to direct therays through the part in a rfu/o-lingual direction to obtain a clear outline MAKING DENTAL RADIOGRAPHS 109 of the roots. This sometimes superimposes the two mesial canals one overthe other. Observe the roots of the second molar on the readers left inFig. 104 and note that directing the rays straight through—i.e., at rightangles to the long- axis of the tongue—would cast the mesio-buccal canalon the film to the mesial of the mesio-lingual canal. There are various methods of holding the filmin the mouth during i
