CHAPTER IX. 



EXOSTOSES, THEIR NATURE, CAUSE, SYMPTOMS 

 AND TREATMENT. 



An exostosis is a bony enlargement, and may 

 exist on any part of the osseous framework. Ring 

 bone, side bone bone spavin, and splints furnish us 

 the best example as to its development. When con- 

 fined to the teeth it attacks no other part of a fully 

 formed tooth than the root. If it exists on the 

 crown or free surface of a tooth it is developed with 

 the tooth. As has been already noted the tooth con- 

 sists of enamel, dentine and cementum, or crusta- 

 petrosa. The latter alone only of these tissues con- 

 tain sufficient vascularity for the development of 

 these tumors. 



The exostoses assume various sizes, shapes and 

 positions. They usually commence near the extrem- 

 ity of the root, covering more or less the whole 

 external surface. Others, however, surround the 

 root at some distance from its extremity; and others 

 develop on the sides forming a large tubercle like the 

 one illustrated in Fig. 24. 



Here we have one of those tubercles developed 

 on each side, the deposition continuing until they at- 



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