. Elementary and dental radiography . id 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 ]nis cavity or cNst ; (6) in cases of fracture of the mandible;(7) in locating exactly bone whorls, calculi in the glands or ducts ofglands and f(M-cign bodies in the antrum; (8) in learning the size, shapeand location nf the antrum as an aid in opening into it; and (9) in casesof tumor to locate more dellnitelv tlie oltendincr bo
. Elementary and dental radiography . id 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 ]nis cavity or cNst ; (6) in cases of fracture of the mandible;(7) in locating exactly bone whorls, calculi in the glands or ducts ofglands and f(M-cign bodies in the antrum; (8) in learning the size, shapeand location nf the antrum as an aid in opening into it; and (9) in casesof tumor to locate more dellnitelv tlie oltendincr bodv. 3i6 DENTAL RADIOGRAPHY Plastic Radiography. There is no one thing which so Hmits the nsefuhiess of the radio-graph as its lack of good perspective. Hence our interest in stereoscopicracHography. 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 < ■ Fig. 353. Plastic reproduction of Fig. Fig. 354. Fig. 353 enlarged. 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 plastictCCbniC Of radiograph. The negative is made as usual. For Plastic convenience in referring to it we shall call the nega- RacliOflrapby. tive the first picture. From the first picture another picture, the second picture^ is made on a photographicplate, the technic for doing this being the same as for making lanternslides (see Chap. V). The first and second pictures are now placed to-gether, non-sensitive sides in apposition, held up to the light and movedabout until the parts of the two pictures overlie one another exactly. Theyare now held immovable while an assistant sticks them together with SriiRllOSCOPJC RADJOGRAIIIY 317 paper binding strips. Next, place them in a printing frame and make aphotographic print on paper (see Figs. 335. 3
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