222 ANIMAL DENTISTRY. 



assure destruction of the organism the surgical wound may 

 be treated with powdered copper sulphate at intervals of four 

 to five days during the healing process. The inoperable 

 tumor on the surface of the body is injected with a solution 

 containing some form of iodine. Lugol's solution, potas- 

 sium iodide, 2 per cent, or tincture of iodine, may be used for 

 this purpose. Internally potassium iodide will prove bene- 

 ficial. The loose teeth must be extracted and the caustic 

 treatment applied to the entire diseased area when possible. 



DENTAL TERATOMATA. 



Synonyms — Dentigerous cysts, dental cysts, mastoid 

 fistulac. 



Definition — An abnormality of early embryonic origin in 

 ^vhich one or two teeth develop on the temporal bones near 

 the base of the ear. It is a common abnormality of solipeds 

 but occurs occasionally in other mammals. 



'Etiology — The cause of dental teratomata is found in an 

 aberration of the embryonic evolution of the teeth, guttural 

 pouch and external car, the mechanism of which is so compli- 

 cated as to be susceptible to variations. The condition is 

 closely allied to conchal fistula, with which it is frecjuentlv 

 associated. 



Symptoms — Dental teratomata of the mastoid region 

 exist from the time of birth, although they may escape detec- 

 tion until maturity, lliey appear at the surface in the form 

 of a fistulous opening below the base of the ear or along- the 

 margin of the conchal cartilage, discharging a limited cjuan- 

 tity of a viscid mucoid secretion. The channel is lined with 

 a well organized epithelial membrane continuous with the 

 skin at the orifice. They are susceptible to pathological con- 

 ditions which may for the first time direct attention to their 

 presence. When they become infected the resulting osteitis. 



