General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . conditions have been replaced by inflammatory cells;i. e., mononuclear wandering cells comprising mononuclear leucocytes, lymphocytes, andplasma cells and polymorphonuclear leucocytes in small numbers, a, a, elongated epithelialprojections; b, b, round cell infiltration. Mast cells are also to be located under thehigher magnifications. infectious osteomyelitis. The medullary substance contained inthe cancellated spaces becomes the seat of a chronic inflamma-tion i
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . conditions have been replaced by inflammatory cells;i. e., mononuclear wandering cells comprising mononuclear leucocytes, lymphocytes, andplasma cells and polymorphonuclear leucocytes in small numbers, a, a, elongated epithelialprojections; b, b, round cell infiltration. Mast cells are also to be located under thehigher magnifications. infectious osteomyelitis. The medullary substance contained inthe cancellated spaces becomes the seat of a chronic inflamma-tion in which osteoclasts play an active part. The hard sub-stance of the bone disappears through osteoclastic action, the SUBGINGIVAL DEPOSITS 395 cancellated spaces are eaten through, and the Haversian canalswidened. The contents of the spaces become filled with largemasses of inflammatory cells, viz., mononuclear and polymorpho-nuclear leucocytes, lymphocytes, plasma cells, and giant cells. Suc-cessively the bone lamellae are destroyed or carried away by osteo-clasis and the inflamed medullary contents of the canal breaks Fig. 319.—Chronic inflammation of the free gingiva. The tissue has lost all itshistologic characteristics and is gradually disappearing as the result of interference with itsnutrition, and cell liquefaction. Kirk1 believes that the principles governing- the precipitationof earthy phosphates and carbonates directly from the salivain the production of true salivary tartar govern also the pro-duction of the girdle-like concretions that are found encirclingthe teeth at and below the anatomic neck and beneath the gum IKirk: American Text-book of Operative Dentistry, Philadelphia, Lea & Febiger. 396 DENTAL PATHOLOGY margin. The preliminary step in the formation of subgingivaldeposit this investigator attributes to the retention under thegingival tissues of an inflammatory exudate rich in colloid ma-terial, the latter being the binding material of the deposit,
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