. Dental and oral radiography : a text book for students and practitioners of dentistry . Fig. 66. A necrotic area lying below a lower cuspid. It will be noted that thereis not a distinct and abrupt line of demarcation between the light area andits surrounding tissue as is the case with alveolar abscesses, but the areagradually shades off from light into dark. portraying the progressive characteristics of thisdisease. (See Figs. 66 and 67.) The different tilling materials vary but little INTERPRETATION OF RADIOGRAPHS 141 in the relative graduation of their shadows. Oxy-chloride, gutta-percha,
. Dental and oral radiography : a text book for students and practitioners of dentistry . Fig. 66. A necrotic area lying below a lower cuspid. It will be noted that thereis not a distinct and abrupt line of demarcation between the light area andits surrounding tissue as is the case with alveolar abscesses, but the areagradually shades off from light into dark. portraying the progressive characteristics of thisdisease. (See Figs. 66 and 67.) The different tilling materials vary but little INTERPRETATION OF RADIOGRAPHS 141 in the relative graduation of their shadows. Oxy-chloride, gutta-percha, and cement have about thesame density, and when used as root rilling ma-terials, are plainly visible as light lines. Becausethey differ in density from cementum and den-tin, the extent to which they have been intro-duced into the root canals is easily Fig. area of necrosis about the roots of a lower first molar. Broken-off broaches and other instruments, orsmall wires introduced into root canals to deter-mine their length or the extent to which they havebeen opened, because of their great density, ap-pear very white and are easily differentiated fromroot-canal fillings or tooth structure. (Figs. 68and 69.)Where a destructive process has ensued in the 142 DENTAL AND ORAL RADIOGRAPHY peridental membrane, or in the bony Avail of thealveolus (pyorrhea pockets) and is present onthe mesial or distal side of a tooth, these condi-
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