102 VE TERINAR T DENTAL S URGER T. 



This tooth had no attachment whatever to the soft 

 structures^ but was retained in the mouth by the 

 exostosis on the third molar. 



CHARACTER OF THE EXOSTOSIS. 



I have not been able to make out definitely the 

 class of structure entering into the formation of the 

 osseous tumor. During its growth it has enveloped 

 such foreign substances as hay and hair which are 

 now plainly visible. Nearest the tooth it has the 

 appearance of crusta petrosa, while the more remote 

 portions resemble a calculus deposit, not very firm in 

 texture. That portion next the tooth however, has 

 taken a very high polish from coming in contact 

 with the teeth of the upper jaw which passed down 

 upon the inside of the tumor. Had the tumor not 

 been worn away by this friction it would undoubtedly 

 have weighed at least two ounces more. 



The osseous walls of the sinuses, also become the 

 seat of osseous tumors exostoses. The inferior 

 maxillary sinus is most often the seat of this disease, 

 although the superior maxillary and frontal sinuses 

 sometimes suffer from a similar affection. 



These tumors or exostoses present a variety of 

 forms; some are entirely composed of bone, some of 

 bone and cartilage, some of cartilage, and others bone 

 and fungous flesh. 



The first consists of a deposition of bony material 

 between the bone and periosteum, to both of which 



