The Dental cosmos . in to appear. (See Fig. 5.) The presence of this dense reticulum of living matter obviouslyexplains the fact that the interzonal layer between enamel and dentineis so extremely sensitive. I am sure that every dentist is made awareof this striking fact when cutting into dentine. The dentinal fibersrarely enter the enamel in human teeth, but, as already stated byBodecker (1. a), the reticulum of the dentine is continuous with that VOL. XXXIII.—52 722 THE DENTAL COSMOS. of the enamel. This connection, however, I was unable to trace my-self, as in all my specimens the enamel wa
The Dental cosmos . in to appear. (See Fig. 5.) The presence of this dense reticulum of living matter obviouslyexplains the fact that the interzonal layer between enamel and dentineis so extremely sensitive. I am sure that every dentist is made awareof this striking fact when cutting into dentine. The dentinal fibersrarely enter the enamel in human teeth, but, as already stated byBodecker (1. a), the reticulum of the dentine is continuous with that VOL. XXXIII.—52 722 THE DENTAL COSMOS. of the enamel. This connection, however, I was unable to trace my-self, as in all my specimens the enamel was dissolved and removed bythe camels-hair brush prior to mounting. V. Interzonal Layer between Dentine and Cementum atthe Neck of the Tooth. Ever since John Tomes* drew attention to the peculiar fact that thedentinal fibers stopped short of the cementum, special attention hasbeen paid to this region of the dentine, since it is also known to bemore sensitive than the rest of the dentine. According to Tomes, Fig. Neck of temporary tooth. Longitudinal section, stained with chloride of gold, decalcifiedwith acetic acid. X 400. D, D, dentine, main mass ; N, N, dentine of neck, bordered upwardand downward by coarsely granular layers; C, C, cementum of neck ; P, P, shreds of perice-mentum. the greater degree of sensitiveness observable in the dentine im-mediately below the enamel—that is, at the point of ultimate dis-tribution of the dentinal tubes, and consequently of their contents—may be fully accounted for on the supposition that the latter are or-gans of sensation, the highest sensibility of which is confined to theirbranches. This hypothesis does not find foundation in the region of the neck,where bifurcation of dentinal fibers are often missing or are is only a uniformly granular layer visible in unstained andground specimens between the surface of the dentine and the terminalpoints of the dentinal fibers. Still, the sensitiveness at the neck is un- * Sys
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