. Elementary and dental radiography . urface should be polished with ferrotype polish. Ferrotype polish is asolution of paraffin in benzine. It is put on the ferrotype, allowed to dryfor a few minutes, then the enamel surface polished with chamois the prints do not come off the ferrotype as they should, but sticktightly, mor,- paraffin should be added to the polishing solution. The mostcommon cause for prints sticking to the squeegee board, however, is thefailure to allow them to dry thoroughly. In all the poses thus far described the film has Placina films been placed inside the mouth
. Elementary and dental radiography . urface should be polished with ferrotype polish. Ferrotype polish is asolution of paraffin in benzine. It is put on the ferrotype, allowed to dryfor a few minutes, then the enamel surface polished with chamois the prints do not come off the ferrotype as they should, but sticktightly, mor,- paraffin should be added to the polishing solution. The mostcommon cause for prints sticking to the squeegee board, however, is thefailure to allow them to dry thoroughly. In all the poses thus far described the film has Placina films been placed inside the mouth. Though it is not of ten Outside the expedient to do so, because of the longer exposure Ittoutb. necessarv, it i- nevertheless sometimes advisable to place the film outside the mouth. (Fig. 96.) The MAKING DENTAL RADIOGRAPHS 107 film packet may be held, sensitive side toward the cheek, with adhesivetape. With the film placed as in Fig. 96, the pose should be as inFig. 97. The time of exposure for this pose is about six times as long. Fig. 07. Pose for making a radiograph of the lower molar region with the film outside of themouth, as in Fig. !*fi. 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. ro8 DENTAL 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
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