. Dental and oral radiography; a textbook for students and practitioners of dentistry . Fig. SS-B. Iig. 55. —The ai-eas in the upper and lower jaws extending from tlie median lin<lo Ihc lirst premolar can Ije radiographed by utilizing tliis teehnic. A, techiiie Imleft sirle; B, teehnic for right side. 104 DENTAL AND ORAL RADIOGRAPHY longer period than is required in making the exposuresof the other areas mentioned. When ready to make the exposure for extra-oral radio-grams, the apparatus is arranged with the anode of thetube about twenty inches from the plate. The patientis instructed to he
. Dental and oral radiography; a textbook for students and practitioners of dentistry . Fig. SS-B. Iig. 55. —The ai-eas in the upper and lower jaws extending from tlie median lin<lo Ihc lirst premolar can Ije radiographed by utilizing tliis teehnic. A, techiiie Imleft sirle; B, teehnic for right side. 104 DENTAL AND ORAL RADIOGRAPHY longer period than is required in making the exposuresof the other areas mentioned. When ready to make the exposure for extra-oral radio-grams, the apparatus is arranged with the anode of thetube about twenty inches from the plate. The patientis instructed to heep the mouth closed tvith the teethtogether in their natural occlusion. They should also bewarned as to the approximate length of time the ex-posure will require, and that they must remain Fig. 56.—The structures at the median line including the incisors, both above andbelow, may be secured in this way. With the more powerful types of apparatus, extra-oralradiograms require but short exposures, but if an oper-ator does not possess high power apparatus, he shouldnot hesitate to use this method, as a patient properlyseated and supported, as shown in Fig. 49, can easily re-main quiet for five or ten seconds, or perhaps even longer,should it be necessary. In making a complete radiographic examination of theteeth, the maxilla and mandible, the author suggests thefollowing procedure. Extra-oral radiograms should be DENTAL AND ORAL RADIOGRAPHY TECIIISriC 105 made of each side, using the technic ilhistrated in , 51, and 55. This would mean two plates for eachside. Then by the use of intra-oral films, the region ly-ing between the cuspids both above and below, should beradiographed. These plates and films should then bedeveloped and examined. If the procedure has been c
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