. Dental and oral radiography : a textbook for students and practitioners of dentistry . Fig. 62.—Instances where inflammatory processes have resulted in a hypertrophy of the peridental membrane and resultant encroachment upon the alveolar bony structures. In the instances shown, the clinical findings gave confirmation of the fact that these were chronic dento-alveolar abscesses. INTERPRETATION OF RADIOGRAMS 143 for our patients we are now entering upon a period ofgreater conservatism as a result of past experience anda more accurate knowledge of the subject which this ex-perience has brought.
. Dental and oral radiography : a textbook for students and practitioners of dentistry . Fig. 62.—Instances where inflammatory processes have resulted in a hypertrophy of the peridental membrane and resultant encroachment upon the alveolar bony structures. In the instances shown, the clinical findings gave confirmation of the fact that these were chronic dento-alveolar abscesses. INTERPRETATION OF RADIOGRAMS 143 for our patients we are now entering upon a period ofgreater conservatism as a result of past experience anda more accurate knowledge of the subject which this ex-perience has brought. One eminent investigator* in this field has demon-strated a very important fact in regard to radiographicvariations which the student should bear in mind, viz.,that infection is not the only cause for radiographic vari-ations in films and that infection and inflammation arenot necessarily synonymous. In radiographic variations,. Fig. 63.—Chronic dento-alveolar abscesses with cystic formation. such factors as hyperocclusion, disuse, chemical influ-ences and pressure are likewise influences which mustbe considered possibilities in interpreting such judging the relationship of individual teeth to anysuspected condition, two structures having a character-istic radiographic appearance should be carefully scru-tinized. These are the peridental membrane, showing as 1922. *Dr. Joseph Pollia. The Journal of the National Dental Association, January, 144 DENTAL AND ORAL RADIOGRAPHY a fine black line, and the peridental Lamella,* risible as afine white line A The characteristic appearance of these
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