. Elementary and dental radiography . Fig. 97. Pose for making a radiograph of the lower molar region with the film outside of thenioutli, as in Fig. !)(>. and the radiograph made from this pose. as it would be if the film were placed inside of the mouth and the samefield radiographed. The increase in time exposure necessary is due tothree things: First, the increased distance between the target and thefilm. Second, the great thickness of tissue to be penetrated. Third, theincreased distance between the teeth and the film; the closer the object tobe radiographed is to the film or plate the
. Elementary and dental radiography . Fig. 97. Pose for making a radiograph of the lower molar region with the film outside of thenioutli, as in Fig. !)(>. and the radiograph made from this pose. as it would be if the film were placed inside of the mouth and the samefield radiographed. The increase in time exposure necessary is due tothree things: First, the increased distance between the target and thefilm. Second, the great thickness of tissue to be penetrated. Third, theincreased distance between the teeth and the film; the closer the object tobe radiographed is to the film or plate the better and more quickly it canbe radiographed. io8 DEXTAL RADIOGRAPHY Owing to the curvature of the dental arch it is often extremely diffi-cult to obtain a good picture of the lower incisors with the film placedto the lingual and parallel to the long axis of the teeth. This is because. Fig. 98. Pose for making a radiograph of the lower incisors, and the anlia. the film cannot be placed in this position without bending it considerably,and the bending results in distortion and blurring of the radiograph. Afilm may be placed in the mouth as in Fig. 92, or a plate or large film,4x5 inches or larger, may be placed on a stand, sensitive side up, and thepatient posed as in Fig. 98. It is usually necessary to have the patientremove the collar for this pose. Fig. 98, because of its lack of per-spective, is perhaps a little misleading. The rays are not directedstraight through the neck, as the picture seems to show. The tube is a MAKING DENTAL RADIOGRAPHS 109
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