. Elementary and dental radiography / by Howard Riley Raper . side the mouth as usual, the detail in the picture of thecuspid would be a little greater than the detail in the other teeth. If thecuspid lay to the labial.—farther away from the film.—detail in it wouldbe less than in the other teeth. But, on the whole, this method of deter-mining bucco- or labio-hngual location is unreliable. READIXG RADIOGK. WHS 143 While I agree with Dr. C. H. Abbot, of Berlin, who has done somewriting and experimental work to prove that radiographs are not totallylacking in perspective, yet I do declare, from
. Elementary and dental radiography / by Howard Riley Raper . side the mouth as usual, the detail in the picture of thecuspid would be a little greater than the detail in the other teeth. If thecuspid lay to the labial.—farther away from the film.—detail in it wouldbe less than in the other teeth. But, on the whole, this method of deter-mining bucco- or labio-hngual location is unreliable. READIXG RADIOGK. WHS 143 While I agree with Dr. C. H. Abbot, of Berlin, who has done somewriting and experimental work to prove that radiographs are not totallylacking in perspective, yet I do declare, from the standpoint of their prac-tical application to dentistry, that they are simply shadow pictures. Andlet me here warn you that like all shadows, X-Ray pictures are often ex-tremely misleading; one might say, for the word seems to fit so well,treacherous. To eliminate the chance of misreading, because of distor-tion of the radiograph, it is often expedient to make several pictures ofthe same part or field, changing the pose. Even this, however, does not. Fig. 126. A dental fluoroscope. Fig. 127. Shadows of teeth cast on the fluoroscope. preclude the possibility of misinterpretation. To correctly read radio-graphs, a man must be, not only a student of radiography, anatomy, his-tology and pathology, but he must have and use that gift of the gods—common sense. He must not jump at conclusions, and he should everregard the radiograph as a shadow picture, liable to all the apparent mis-representations of shadows. A study of Fig. 125 will convince anyone of the lack of perspec-tive in at least some radiographs. One is unable to determine, fromobserving this radiograph, whether the coin pictured is in the flesh ofthe hand, on the back of the hand, or in the palm of the hand. Likewise,from simple observation, it is impossible to tell whether the needle is in,on, or under the hand. By deduction, we may come to this conclusion:The coin was nearer the plate, during its exposure, than
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