92 DISEASES, OF THE TEETH. 



few days, a regular sinus or fistula is formed, which is usually 

 treated by caustics, but without any good result. 



Professor Bouley refers in a very happy manner to impor- 

 tant changes which occur in carious molars in the horse. 

 When the tooth socket is opened through the tooth, the 

 membrane which lines the alveolus becomes inflamed, and 

 soon there is a deposition of bone or cement irregularly around 

 the tooth. The root of the tooth is, therefore, the seat of a 

 true exostosis; and from the tension of parts inflamed and 

 thickened, it is easy to believe that the poor animal must 

 suffer intense pain. The thickening of the bone or cement 

 around the fang of a diseased molar tends to render the ex- 

 traction of the tooth more difficult than when such change 

 has not occurred. 



If caries affects either or both of the first two molars, they 

 are apt to induce atrophy of the bone, disease communicating 

 with the nasal chamber. The root of the third molar corres- 

 ponds to the point where the sensitive fifth pair of nerves 

 pass out of the facial bones, and inflammation or thickening 

 of the parts here is attended with the most excruciating pain. 

 Disease of any of the three last upper grinders, on the other 

 hand, leads to extensive tumefaction and disorganization in 

 the cavities known as the maxillary sinuses, which communi- 

 cate with the nose, and discharge through it the foetid pus 

 which often forms there as a consequence. 



DISEASES OF THE DENTAL PULP. There is but one case 

 recorded, and that a very singular one, in which the pulp 

 within one of the roots of a molar tooth had evidently been 

 inflamed, and had afterwards undergone a calcareous degene- 

 tion. The affected root was enormously enlarged, and the 

 crown of the tooth gave indications of commencing caries. 

 Professor Bouley, who reports the above case, refers to another 

 very singular one of 



