The Dental cosmos . ces of the nuclei of the corpuscles. A similar formation of dentinoid or osteoid substance by directconversion of the pulp-tissue very often, if not always, takes placewhere the pulp has been reduced to a very narrow body. ANATOMY AND PATHOLOGY OF THE TUSKS OF THE ELEPHANT. 431 In Fig. 62 a case of this kind is represented, a, 6, is a section ofivory taken from near the apex of the pulp ; at a the dentinal tubulesare still present, but in much smaller numbers than in normal b the tubules have completely disappeared and their place has beentaken by cement-lacunae, i
The Dental cosmos . ces of the nuclei of the corpuscles. A similar formation of dentinoid or osteoid substance by directconversion of the pulp-tissue very often, if not always, takes placewhere the pulp has been reduced to a very narrow body. ANATOMY AND PATHOLOGY OF THE TUSKS OF THE ELEPHANT. 431 In Fig. 62 a case of this kind is represented, a, 6, is a section ofivory taken from near the apex of the pulp ; at a the dentinal tubulesare still present, but in much smaller numbers than in normal b the tubules have completely disappeared and their place has beentaken by cement-lacunae, in most of which the nuclei of the corpusclesare clearly visible. At d we see remains of encapsuled pulp-tissue ;at c the dried pulp, the cells of which have for the most part becomeinvisible by the long process of drying. A similar process may be observed in the roots of human teeth,and has been referred to by Black in the American System ofDentistry (vol. i, p. 880), and by me in my article on The Decom- Fig. 63. c. Cross-section from the root of a human tooth, showing a process analogous to that seen inFig. 62. About 20 : 1. position of the Contents of the Dentinal Tubules as a DisturbingFactor in the Treatment of Pulpless Teeth (Dental Cosmos, 1890,p. 349). (See Fig. 63.) Etiology of Pulp-Nodules. The question of the origin or mode of formation of pulp-noduleshas occupied the minds of dental scientists for years, and has beenthe subject of much study and many communications. All the moreinterest attaches to the subject for the reason that a certain funda-mental question is involved in its solution. Adherents of the view thata given tissue or group of cells can perform only that function lorwhich it was specifically designated, deny that pulp can producedentine under any circumstances except through the agency ot theodontoblasts. 432 THE DENTAL COSMOS. Busch * is a most strenuous advocate of this view. Reasoning froma theoretical stand-point, he maintains that the odontoblast
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