. Dental and oral radiography; a textbook for students and practitioners of dentistry . Fig. 79.—Extra-oral radiogram of the right side made for piirposes of general ex-amination. Suspicious areas are to be seen above the upper first bicuspid and aboutroots of the lower second molar. An unerupted upper third molar is also visible. To Determine the Seat of Pericemental Infections Not infrequently it is a difficult matter to determinethe tooth responsible for a pericemental infection or analveolar abscess, as the inflammatory process may be inprogress in the region of several teeth, each of Avhi
. Dental and oral radiography; a textbook for students and practitioners of dentistry . Fig. 79.—Extra-oral radiogram of the right side made for piirposes of general ex-amination. Suspicious areas are to be seen above the upper first bicuspid and aboutroots of the lower second molar. An unerupted upper third molar is also visible. To Determine the Seat of Pericemental Infections Not infrequently it is a difficult matter to determinethe tooth responsible for a pericemental infection or analveolar abscess, as the inflammatory process may be inprogress in the region of several teeth, each of Avhichmay be under suspicion, or the infected area may be ata point remote from the suspected tooth. A radio-grapliic examination will quickly settle all doubts, for theradiogram will reveal the source and determine whether 138 DENTAL AND ORAL RADIOGRAPHY or not one or more teeth are involved. •> It will likewiseshow the extent to which the periapical tissnes have be-come involved and will often shed valuable informationon the prognosis of the case. (See Figs. 81, 82 and 83.).
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