The Dental cosmos . theliving matter which is plainlymarked in living, and shriveledand reduced to a row of granulesin dead teeth. Since we know ofno tissue constituted of nerves, we cannot support the suggestion ofJohn Tomes, that dentinal fibers are but nerve-fibers carrying sensationfrom the periphery to the center. Since we know that non-medul-lated nerve-fibers have the same structure as the dentinal fibers, wemust conclude that both the nerves and dentinal fibers are made upof living or contractile matter, the contraction of which is facilitatedby the presence of vacuoles. For, according
The Dental cosmos . theliving matter which is plainlymarked in living, and shriveledand reduced to a row of granulesin dead teeth. Since we know ofno tissue constituted of nerves, we cannot support the suggestion ofJohn Tomes, that dentinal fibers are but nerve-fibers carrying sensationfrom the periphery to the center. Since we know that non-medul-lated nerve-fibers have the same structure as the dentinal fibers, wemust conclude that both the nerves and dentinal fibers are made upof living or contractile matter, the contraction of which is facilitatedby the presence of vacuoles. For, according to modern researches,the conduction of sensation centripetally and of motion centrifugallyis very probably instituted by the contraction of living matter. IV. Interzonal Layer between Dentine and Enamel. In all the provisional teeth that I have examined a zone of varyingbreadth was visible along the outer periphery of the dentine, conspic-uous by a darker violet stain than the rest of the dentine. In fact, Fig. Dentine of a dead temporary tooth. Trans-verse section of canaliculi, stained with chlorideof gold, decalcified with acetic acid. X , C, dentinal canaliculi, holding shriveled den-tinal fibers ; B, B, basis-substance, containinga^shriveled, indistinct reticulum. MINUTE STRUCTURE OF DENTINE. 72I this region is rather prone to be overstained and become too dark forexamination with high powers ; hence, we should examine this regionbefore it has assumed a deep stain, owing to a protracted exposure tolight. The first feature which strikes us upon approaching the outerperiphery of the dentine is the beaded appearance of the dentinalfibers, lacking vacuoles in this situation. The fibers are bifurcating,as is well known, and, becoming more and more delicate, correspond-ingly exhibit more and more beads. The reticulum into which thelateral conical offshoots of the dentinal fibers inosculate is extremely Fig. 5.
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Keywords: ., bookauthor, bookcentury1800, bookdecade1890, booksubjectdentistry
