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 

 fistulae. 



Definition — An abnormality of early embryonic origin in 

 which 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 ear, 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 frequently 

 associated. 



Symptoms — Dental teratomata of the mastoid region 

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

 tion until maturity. They 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 quan- 

 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, 



