182 



ANIMAL DENTISTRY. 



deficiency in the proper length of the premaxilla or an elon- 

 gation of the inferior maxilla. 



Symptoms — Prognathism exists most frequently in dogs 

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

 however, occasionally encountered in the horse, the molars 

 sharing the abnormality. 



Fig. 129. 

 A Typical Case of Parvignathism (Ostertag). 

 A, B. The beveled molars. 

 C. 1st inferior molar absent. 



Treatment — In 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. Beveling of the molars. ' 

 Definition— A congenital deformity consisting of a de- 

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



