. Radiography and radio-therapeutics . rk or a towel rolled up tight is also veryefficacious when other appliances are not at hand. The stereoscopic methodis invaluable in the examination of the teeth. Special appliances have been devised for the retention of the film in themouth. A suitably shaped cork is provided with a slot, into which variousrectangular plates of metal are slipped. These metal plates are soft, and canbe bent into any curve to suit the contour of the mouth, and thus secure aclose contact. The cork is gripped in the mouth by the patient, it beingobvious that this method enab
. Radiography and radio-therapeutics . rk or a towel rolled up tight is also veryefficacious when other appliances are not at hand. The stereoscopic methodis invaluable in the examination of the teeth. Special appliances have been devised for the retention of the film in themouth. A suitably shaped cork is provided with a slot, into which variousrectangular plates of metal are slipped. These metal plates are soft, and canbe bent into any curve to suit the contour of the mouth, and thus secure aclose contact. The cork is gripped in the mouth by the patient, it beingobvious that this method enables the film to be held in any positioninside the mouth without any further device or support. The films arewrapped up in paperas usual, with a smallloop of paper left at theback, which is slippedover the metal plate,so that any curve towhich the plate is bentalso carries the filmwith it. The films whendried require to beviewed in a transmittedlight. Celluloid mounts CASE c n. V LINGUAL ASPECT Fig. 181.—^Representing a celluloid mount with one dental filmin position. with cut-out tongues to grip the films can be obtained, and these providea convenient method of examining the films. 212 EADIOGRAPHY The Cervical Region The best positions in which to radiograph this area are : (1) The antero-posterior, and (2) thelateral. The anteropos-terior is comparativelyeasy in the lower two-thirds. When the patientis placed with the pos-terior aspect on the plateand the tube centred overthe middle of the plate, aview is obtained of thecervical vertebrae and theupper dorsal, the apices ofthe lungs coming into thepicture, as do also thesternal ends of the clavi-cles and the manubriumsterni. The upper cer-vical vertebrae are ob-scured by the basi occiputand the lower maxilla. Should it be necessaryto obtain an impression Fig. 182.—Upper cervical region, anteroposterior view. of the first three Cervical Taken with plate behind and an extension tube in front of the vprtpb
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