CHAPTER VI. 



DISEASES AND IRREGULARITIES OF THE TEETH. 

 NECROSIS OF THE TEETH OF HERBIVORA. 

 Synonyms: — Alveolar-periostitis. Peridentitis. Perice- 

 mentitis. Pulpitis. Dentitis: Caries (erroneous). Decayed 

 teeth. 



Fig. io6. 



Molars Predisposed to Decay by an Open Channel Through the Crusta 



Petrosa of the Infundibula. 



1, I. The infundibula. 



2, 2. Openings of channel at table. 



3, 3. Pulp cavity. (In the short [old] tooth the pulp cavity is already 

 closed.) 



Definition; — A total necrosis of one or more molars of 

 herbivorous animals, of inflammatory origin, due to a pri- 

 mary or secondary infective inflammation of the pulp. 



Etiology: — The entrance of food into an imperfectly 



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