. Dental and oral radiography; a textbook for students and practitioners of dentistry . grams must understand enough of the funda-mental rules of radiographic technic to know when ex-amining a radiogram, ivhether or not the technic in-volved in its making ivas correct or fcmlty, and if fcmlty,whether or not the degree of faidt is sufficient to renderit so inaccurate as to be useless. 124 DENTAL AND OEAL RADIOGRAPHY In correctly made radiograms, the dental and oralstructures under normal conditions have a characteristicappearance, for, owing to the var^dng densities of thecontained structures i
. Dental and oral radiography; a textbook for students and practitioners of dentistry . grams must understand enough of the funda-mental rules of radiographic technic to know when ex-amining a radiogram, ivhether or not the technic in-volved in its making ivas correct or fcmlty, and if fcmlty,whether or not the degree of faidt is sufficient to renderit so inaccurate as to be useless. 124 DENTAL AND OEAL RADIOGRAPHY In correctly made radiograms, the dental and oralstructures under normal conditions have a characteristicappearance, for, owing to the var^dng densities of thecontained structures in our field, they appear upon theplate or film in a manner most advantageous for obser-vation. For instance, it will be noted upon the examina-tion of such a radiogram, that metallic fillings, if theyare present, appear as white masses, and root fillings assomewhat less dense lines. The enamel and dentin arenext in density, while root canals show plainly as darkchannels in the dentin, and the alveolar process and max-illse show their fine uniform cancellous structures in vari- # r ^. A. B. Fig. 61.—The radiographic appearance of the teeth and their surrounding struc-tures under normal conditions are here shown. A, upper bicuspids and molars; B,lower molars. ous degrees of density, depending upon their thickness.(See Fig. 61.) In examining a radiogram, it is essential that theoriginal plate or film only be used, and this should beexamined carefully and in a proper light, if the maximumamount of information is to be obtained from it. This is best accomplished by utilizing some sort ofilluminating box or cabinet from which varied degreesof light are obtainable. The face of such a cabinetshould be covered with ground glass, so that the lighttransmitted will be equally distributed and free fromshadows. As a radiogram is a transparency, a dim light INTERPRETATIOiSr OF RADIOGRAMS 125 behind it will bring out one set of shadows to theirgreatest clearness. An increase in the light wil
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradiogr, bookyear1919
