. Dental and oral radiography : a textbook for students and practitioners of dentistry . 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 A
. Dental and oral radiography : a textbook for students and practitioners of dentistry . 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. Fig. 64.—Three instances of true cysts occurring in the mandible. two structures is due in the former instance to the factthat the soft tissue of the membrane offers little resist- Terms suggested by Dr. Joseph Pollia to be used instead of cribriform plate. tThe white line of demarcation which is intact around a normally disposed toothwas first called to the attention of the profession by Dr. Leland Carter. (Interna-tional Journal of Orthodontia, July, 1917.) INTERPRETATION OF RADIOGRAMS 145 ance to passage of the rays and therefore throws noradiopaque impression, while in the latter instance, thethin compact bone resists the passage of the rays and isvisible as a thin radiopaque line. About a healthy tooth,these two structures shoiv no variation of thickness orcontour. If a pathological process has its origin from within atooth, the first structure to be subjected to its influence
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