1S:> 



ANIMAL DKXTISTRY 



deficiency in the proper leni^tli of the jiremaxilla or an elon- 

 gation of the inferior niaxilhi. 



Symptoms — Prognathism exists most frcMfiiently in dogs 

 in which animals it is characteristic of certain breeds. It is, 

 however, occasionally encountered in the horse, the molars 

 sharine the abnormality. 



Fig. 129. 

 A Typical Case of Parvignatliisni (Ostertag). 

 A, B. The beveled molars. 

 C. 1st inferior molar absent. 



Treatment — Tn the dog, none. In the horse the superior 

 incisor crowns are shortened from time to time by filing and 

 the molars are kept level. 



PARVIGNATHISM. 



Synonyms — Scissor mouth. Ijevcling of the molars. 

 Definition — A congenital deformity consisting of a de- 

 ficiency in tlie proper width of the lower jaw, or more prop- 



