. Elementary and dental radiography / by Howard Riley Raper . important reasons why dentalstereoscopic work probably never will be popular, even among specialists,is that we feel no great need of it. The single radiograph is not totallylacking in perspective, and a careful study of it will reveal almost, if notquite, as much as can be seen in the dental stereoradiograph. (7) Thestereoradiograph is sometimes misleading. For example, see Fig. make this illustration three coins were placed on a piece of wirescreening, one directly against the screen, the other two resting on cotton 3i6 DEN
. Elementary and dental radiography / by Howard Riley Raper . important reasons why dentalstereoscopic work probably never will be popular, even among specialists,is that we feel no great need of it. The single radiograph is not totallylacking in perspective, and a careful study of it will reveal almost, if notquite, as much as can be seen in the dental stereoradiograph. (7) Thestereoradiograph is sometimes misleading. For example, see Fig. make this illustration three coins were placed on a piece of wirescreening, one directly against the screen, the other two resting on cotton 3i6 DENTAL RADIOGRAPH \ built up to hold them at different distances from the screen. In thestereoradiograph the coin which rests against the screen seems to standout from it a short distance. Some day perhaps we may so modify and perfect our technic thatthe stereoradiograph will be of indispensable value (i) in observing thethree roots of upper molars; (2) in seeing a wire passing through aperforation to the labial, buccal or lingual; (3) in some particular cases. Fig. 352. Same as Fig. 339 made plastic. of impacted teeth to show more exactly their location, and so aid in theextraction; (4) in showing the orthodontist when he may move the com-ing permanent teeth by moving the deciduous teeth; (5) in determiningmore exactly than can be done with the single radiograph the size andlocation of a pus cavity or cyst; (6) in cases of fracture of the mandible;(7) in locating exactly bone whorls, calculi in the glands or ducts ofglands and foreign bodies in the antrum; (8) in learning the size, shapeand location of the antrum as an aid in opening into it; and (9) in casesof tumor to locate more definitely the offending body. STEREOSCOPIC RADIOGRAPHY 3i; Plastic Radiography. There is no one thing which so limits the usefulness of the radio-graph as its lack of good perspective. Hence our interest in stereoscopicradiography. Hence, also, our interest in plastic radiography. Plastic radiography
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