Dental cosmos . soon asthe proper calcification begins, the salts of lime are deposited first inthe prolongation of Tomess processes, and form thin prisms whichare surrounded by a large amount of an organic cementing , this substance calcifies by degrees, and so the prisms growthicker. Finally there remain only faint traces of a cementing sub- HISTOGENY AND HISTOLOGY OF BONY AND DENTAL TISSUES. II95 stance between the enamel-prisms. In teeth in which the enamel isnot fully developed, we find a larger amount of cementing the canaliculi of the dentine (dentinal tubul
Dental cosmos . soon asthe proper calcification begins, the salts of lime are deposited first inthe prolongation of Tomess processes, and form thin prisms whichare surrounded by a large amount of an organic cementing , this substance calcifies by degrees, and so the prisms growthicker. Finally there remain only faint traces of a cementing sub- HISTOGENY AND HISTOLOGY OF BONY AND DENTAL TISSUES. II95 stance between the enamel-prisms. In teeth in which the enamel isnot fully developed, we find a larger amount of cementing the canaliculi of the dentine (dentinal tubules) reach into theenamel, they always lie in the interprismatic cementing the Marsupialia there are so-called enamel canaliculi which,as direct continuations of the dentine canaliculi, run through theentire thickness of the enamel. Tomes states that these canaliculicorrespond to enamel-prisms. This view is not correct. On thecontrary, I can fully confirm V. v. Ebners statement that among Fig. Fig. 6.—Child, three months old. Second milk incisor of lower jaw with its reserve toothGround section after Kochs petrifving method. , second milk incisor; /.», secondpermanent incisor ; , dentine germ ; D, dentine ; 5, enamel; , enamel-pulp ; , remainsof the dental ridge; , epithelium of the jaw ; K, bone of the alveoli. 9 diam. Marsupialia, also, the enamel canaliculi run in the interprismaticcementing substance. Still more than the formation of the enamel has the formation ofthe dentine been, up to the present time, a matter of v. Ebner alone brought some light into this subject also, andshowed that the pass-word, secretion or change? does not affectthe real point of the matter. The chief question in the formation of 1196 THE DENTAL COSMOS. dentine, as in that of the enamel, is, whether throughout the whole life-time there is only a single layer of odontoblasts, or whether there areany reserve cells. Notwithstanding a most careful
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