. Dental and oral radiography; a textbook for students and practitioners of dentistry . es of two upper bicuspid in°making the radiogram the images of the teeth had been lengthened as the re-sult of incorrect technic, these areas would not be discernible. Fig. 69.—A necrotic area about the roots of an upper central and lateral. eliminated, the cancellous tissues involved will again re-gain their normal character. (See Fig. 67.) Alveolar abscesses do not by any means present astereotyped appearance in the radiogram, but varygreatly in size. For this reason, the smaller ones maysometime
. Dental and oral radiography; a textbook for students and practitioners of dentistry . es of two upper bicuspid in°making the radiogram the images of the teeth had been lengthened as the re-sult of incorrect technic, these areas would not be discernible. Fig. 69.—A necrotic area about the roots of an upper central and lateral. eliminated, the cancellous tissues involved will again re-gain their normal character. (See Fig. 67.) Alveolar abscesses do not by any means present astereotyped appearance in the radiogram, but varygreatly in size. For this reason, the smaller ones maysometimes be overlooked, or not be regarded seriouslyby those lacking the requisites of intelligent interpreta-tion. Likewise, these small abscesses may sometimes notbe apparent in the radiogram as a result of the employ- INTEEPRETATIOiN OF 131 nient of incorrect teclmic in the exposure of the plateor film. (Fig. 68.) Necrosis likewise appears upon the plate as a darkarea, but differs in a characteristic way from the or-dinary alveolar abscess in that it is not circumscribed;. Fig. 70.—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 and its sur-rounding tissue as is the case with alveolar abscesses, but the area gradually shadesoff from light into dark. namely, that there is not a distinct and abrupt line ofdemarcation hetiveen the dark area and its surroundingtissue, as is the case with the circumscribed infections,but the area gradually shades off from dark into light,portraying the progessive characteristics of this disease.(See Figs. 69 and 70.) 132 DENTAL AND ORAL EADIOGRAPHY The different filling materials vary but little in rela-tive graduation of density, and when used as root fillingmaterials, are plainly visible as light lines. Becausethey differ in density from cementum and dentin, the
Size: 1534px × 1628px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectradiogr, bookyear1919
