. Dental and oral radiography : a textbook for students and practitioners of dentistry . Fig. 73. Fig. 74. Fig. 73.—A steel wire introduced into the root canal to determine its length. Ithas passed through the apex and entered the antrum. Fig. 74.—A destructive process involving the pericemental and alveolar tissuesabout an upper first Fig. 75.—Characteristic appearance of the enveloping tissues about the upper l>icuspids and molars in a well-developed case of pyorrhea alveolaris. Compare thecondition shown here with that shown in Fig. 61-^4 and B. INTERPRETATION OF RADIOGRAMS 13
. Dental and oral radiography : a textbook for students and practitioners of dentistry . Fig. 73. Fig. 74. Fig. 73.—A steel wire introduced into the root canal to determine its length. Ithas passed through the apex and entered the antrum. Fig. 74.—A destructive process involving the pericemental and alveolar tissuesabout an upper first Fig. 75.—Characteristic appearance of the enveloping tissues about the upper l>icuspids and molars in a well-developed case of pyorrhea alveolaris. Compare thecondition shown here with that shown in Fig. 61-^4 and B. INTERPRETATION OF RADIOGRAMS 133 extent to which they have been introduced into the rootcanals is easily discernible. (See Figs. 71 and 72.) Broken-ofr broaches and other instruments, or smallwires introduced into root canals to determine theirlength or the extent to which they have been opened, be-
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