. Elementary and dental radiography . Fig. 104. Pose for making radiograph of the antra of Highmore. of ?llmKadiodrapbs. The advantages of the small dental radiographsmade on films held in the mouth over the large plateradiographs are : (i) There is no superimpositionof shadows, and therefore a clearer, better radio-graph can be made on the small film. (2) Thepatient may be seated in the dental chair while the exposure is madewhen small films are used. (3) The time of exposure is shorter for thesmall films. (4) Small machines with which it is necessary to make an MAKING DENTAL RADIOGRAPHS II.
. Elementary and dental radiography . Fig. 104. Pose for making radiograph of the antra of Highmore. of ?llmKadiodrapbs. The advantages of the small dental radiographsmade on films held in the mouth over the large plateradiographs are : (i) There is no superimpositionof shadows, and therefore a clearer, better radio-graph can be made on the small film. (2) Thepatient may be seated in the dental chair while the exposure is madewhen small films are used. (3) The time of exposure is shorter for thesmall films. (4) Small machines with which it is necessary to make an MAKING DENTAL RADIOGRAPHS II. Fig. 105. Ratliograpli made from tlie pose shown in Fig. li»4. A, B. frontal sinuses. C. D. orbits. E, F, ethmoidal cells. F does not show as well as E because the cells of this side are full of pus. (i. H. antra of Highmore. I, J, nasal cavity. As an aid in reading this radiograph observe Fig. 100. (Radiograph by A. M. Cole, of Indianapolis.) exposure of one minute or longer for large plate radiograph will makea good dental radiograph on a film held in the mouth in lo to 30 seconds.(5) A compression diaphragm, though always a valuable appliance, isnot so essential when small films are used as it is when large plates areused. (6) The negative on celluloid cannot be broken. The great advantage of the large plates over the small films is thata larger field can be pictured. ii6 DENTAL RADIOGRAPHY
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