3i6 



J 'etei'inarv Obstetrics 



ivory tumor, or radicular odontome. Occasionally such tumors 

 in the horse reach a weight of five pounds or more. 



There is frequently an arrest in the development of dentine at 

 the wearing surface of the tooth. In the grinder of the horse, 

 where the enamel dips down into the body of the tooth, it serves 

 to bring two lamellae of dentinal substance into close contact. 



Fig. 4M. A and B. Table surface and section of inferior molar of 

 adult liorse, sliowing non-fusion of dentinal lamellae, followed 

 by infection and purulent pulpitis. 



C, E.xternal cement. C, Central cement. E, External enamel. 

 E', Central enamel. P, Pulp cavity surrounded by dentine. 



In the complex grinder of the horse, the papilla or radicle of 

 the tooth, d, Fig, 44, splits up into several sharp elevations 

 which push their way up into the enamel organ. The dentine 

 forms from the ondontoblasts upon the exterior of these ]iro- 

 jections, and the soft tissues, or tooth pulp, occupy the interior 

 of these elevations so that at their apexes the inner, or ptilp, 

 surfaces of the dentinal plates come in immediate contact. 

 Normally the opposing faces of these two plates should fuse 

 at the grinding surface and hermetically seal the pulp cavity as 



