. Dental and oral radiography : a textbook for students and practitioners of dentistry . pening and thereby reach thedesired area. The way in which this is accomplished isshown in Fig. 50, A and B, and Fig. 51, A and B. An important factor in accomplishing this is the posi-tion in which the patients head is held as it is pressedagainst the plate. Held in the manner shown, the rayscan be made to pass in between the ascending ramus ofthe mandible and the spine, and can pass in at approxi-mately a perpendicular direction to the long axis of theteeth and the plate, giving correct shadow lengths up
. Dental and oral radiography : a textbook for students and practitioners of dentistry . pening and thereby reach thedesired area. The way in which this is accomplished isshown in Fig. 50, A and B, and Fig. 51, A and B. An important factor in accomplishing this is the posi-tion in which the patients head is held as it is pressedagainst the plate. Held in the manner shown, the rayscan be made to pass in between the ascending ramus ofthe mandible and the spine, and can pass in at approxi-mately a perpendicular direction to the long axis of theteeth and the plate, giving correct shadow lengths uponthe plate. Fig. 52 shows a radiogram made by using thistechnic. If this rule is disregarded and the rays passed throughthe structures, as shown in Fig. 53, A and B, the shadowsof the opposite side will be superimposed upon the shad-ows of the structures desired, and a chaotic result pro-duced. The result of such technic is shown in Fig. 54. In a similar manner as shown in Figs. 50 and 51, withslight adjustments in the position of the plate, the head, 98 DENTAL AN]) ORAL RADIOGRAPHY. Fig. 50-/4.
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