A Malignant Form of Tumor of the Jaws is indicated by a solid prominence, rapid in growth, and having a tendency to invade surrounding structures, and to fungate like a mushroom.

Treatment

Removal by a surgical operation, and the application of escharotics, as chromic acid, or chloride of zinc, etc., to prevent its reproduction.

A Dentigerous Cyst

Cysts of the teeth are of two kinds - those connected with the roots of developed or eruptive teeth, and those connected with imperfectly developed or unerupted teeth, and both varieties are common to either jaw; the latter, however, are known as "dentigerous cysts." A dentigerous cyst is indicated by the expansion of the bone of the jaw at some particular spot, with disfigurement of the adjacent parts; a sense of weight and tension in the affected part; in some cases, constitutional irritation from pressure; pressure producing a parchment-like crackle or crepitation; absence of a tooth, which has never been erupted nor extracted. Heath remarks that " the clinical history of cysts connected with the teeth is that of painless expansion of the alveolus of either jaw, but more frequently of the upper, with crackling of the bone on pressure, and ultimate absorption of the bony wall. The cyst then presents a bluish appearance through the distended mucous membrane, and if large, gives distinct evidence of fluctuation."

Treatment

A free incision, and the removal of the unerupted tooth by destroying the front wall of the cyst, and the cavity filled with antiseptic gauze or lint, so as to induce granulation and gradual obliteration. In the case of a cyst of the lower jaw, after the removal of the contents and a portion of the wall, the plates of bone should be pressed together as much as is possible.