. Elementary and dental radiography . , 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 offendi
. Elementary and dental radiography . , 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. 3*6 DENTAL RADIOGRAPHY 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 is a method of making radiographs in such away that the parts stand out in has relief. A better name than plastic 1 ^r Fig. 353. Plastic reproduction of Fig. .1. Fig. 353 enlarged. Cechnic of Plastic Radioarapby. radiography would have been trick radiography. I describe the methodsimply as a matter of interest. It is of no practical value whatever. The following are the steps in making a plasticradiograph. The negative is made as usual. Forconvenience in referring to it we shall call the nega-tive the first picture. From the first picture anotherpicture, the second picture, is made on a photographicplate, the technic for doing this being the same as for making lanternslides (sec Chap. Y). The first and second pictures are now placed to-ensitive ^ides in appositii n, held up to the lighl and movedabout until the parts of the two pictures overlie one another exactly. Theynow held immovable while an a^sistanl -ticks them together with STEREOSCOPIC RADIOGRAPHY 317 paper binding strips. Next, place them in a printing frame and make aphotographic print on paper (see Figs. 335. 352, 353 and 354). Whilethe exp
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