191 



VETERINARY PATHOLOGY. 



the enveloping fibrous capsule of the follicle. The hyperplastic 

 fibrous tissue usually fuses with the cementum, and the entire 

 mass may later become calcified or ossified. These odontomata 

 are most common in ruminants, goats especially being affected. 

 They are prone to occur in animals afflicted with, rickets. 



Cementomata ( Usteocystoma capsulare dentiferum) are 

 formed by ossification of excess tissue developed around the 

 tooth follicle, The livperplastic cementum mav include several 

 tCKith germs. They appear as masses of cancellous or spongy 

 bone and are structurally very similar to cementum, being com- 

 posed of irregular spaces surrounded by osseous tissue contain- 

 ing branched lacunae. They are most common in horses, occur- 

 ing most frequently in connection with the incisor teeth. 



115.— Eyithelial Odontoma. 



C(jmpound follicular odontomata result from the ossification 

 of irregularly located areas of the tooth follicle tissues, thus 

 leaving intervening areas of fi1)rous tissue. The ossified masses 

 are designated denticles and they may be very numerous, as 

 many as three hundred having been observed in a single tumor. 

 The intervening tissue usually degenerates and becomes of a 

 liquid consistency. Thus the tumor appears as a cyst containing 

 many cavities. The denticles varv in size and consistencv. These 

 tumors have been observed in the goat, sheep, ox, and horse. 



