. Dental and oral radiography; a textbook for students and practitioners of dentistry . shown in Such a box should be about twelve inches squareand five inches deep. This will enable the storage ofseveral boxes of 5x7 plates, and in addition, three or fourdozen dental films. In their preparation for exposure, each plate is placedin two lightproof envelopes, one of which is black and 115 116 DENTAL AND ORAL, EADIOGRAPHY the other red or orange in color. Such envelopes arefurnished by plate manufacturers and are obtainable inthe desired size. The transference of the plate from itsorigina
. Dental and oral radiography; a textbook for students and practitioners of dentistry . shown in Such a box should be about twelve inches squareand five inches deep. This will enable the storage ofseveral boxes of 5x7 plates, and in addition, three or fourdozen dental films. In their preparation for exposure, each plate is placedin two lightproof envelopes, one of which is black and 115 116 DENTAL AND ORAL, EADIOGRAPHY the other red or orange in color. Such envelopes arefurnished by plate manufacturers and are obtainable inthe desired size. The transference of the plate from itsoriginal box to the envelopes must, of course, only he donein the photographic darkroom. The plate is first slippedinto the smaller envelope which is usually the black one,with the emulsion side of the plate facing the smoothside of the envelope (the side free from seams or over-lapping edges). The envelope containing the plate isthen placed in the larger or yellow envelope, flap-endfirst, with the smooth side of the inner envelope facingthe smooth side of the outer one. Plates prepared in. X-rayproof film and plate chest. this way are then ready for exposure and can be placedback in the lead-lined box until needed. In loading these envelopes, care should be takenlest the emulsion of the plate become scratched, asscratches even though they be very slight will often cur-tail the value of the finished radiogram. It is not advisable to keep large quantities of platesloaded in envelopes, unless they are to be used within afew days, as the contact of the paper with the emulsionwill in time affect it adversely. All brands of x-ray plates are not the same, there-fore, if the best results are obtained in using any par- DEVELOPMENT OF PLATES AND FILMS 117 ticular kind, they must be handled in strict accordancewith the manufacturers instructions. For dental andoral radiography, a plate should be fairly rapid (that is,it should not require a long exposure), give a high de-gree of detail and good
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradiogr, bookyear1919
