THE TEETH. 



633 



tions of the pulp, calcareous granular deposits. He regards them as the 

 result of a pathological process. We are indebted to J. Tomes* for their 

 first minute anatomical description, and to F. Ulrich, t who distinguishes in 

 them two kinds of tissues a dentinoid, an osteoid, and a combination of the 

 two. Wedl t and Heider and Wedl give further anatomical details, and the 

 latter endeavor to determine the mode of development of these new forma- 

 tions. R. Hohl || furnishes a critical treatise, based upon independent inves- 

 tigations, and applies to these formations the terms odontoma, osteoma, and 

 osteo-odontoma. " 



John Tomes and Charles S. Tomes IF say as follows : " With the advance of 

 age, the area of the pulp-cavity becomes gradually diminished by the slow 



'SD 



FIG. 273. CUSP OF AN ANOMALOUS CANINE TOOTH. 



D, dentine ; 8D. secondary dentine ; P l , pear-shaped bioplasson bodies on the boundary 

 between primary and secondary dentine, sending large offshoots, O, downward ; Pt, bioplas- 

 son body without offshoots. Magnified 500 diameters. 



addition of dentine to that which was formed when the tooth was in a state 

 of active growth ; and this condition is still more strongly marked in those 

 teeth which have been worn by mastication ; indeed, in some cases the cavity 



* "A Course of Lectures on Dental Physiology and Surgery," 1848. 



t Zeitschrift der k. k. Gesellschaf t der Aerzte zu Wien, 1851. 



t Grund/iige der Pathol. Histologie, 1854. 



$ Deutsche Vierteljahrsschrift fiir Zahnheilkuude, 1864. 



|| " Monographic iiber Neubildungen der Zahnpulpe," 1868. 



IT " A System of Dental Surgery," Philadelphia, 1873, p. 307. 



