The American text-book of operative dentistry / In contributions of eminent authorities. Ed. by Edward C. Kirk.

  • Edward Cameron Kirk
Date:
1900
Catalogue details

Licence: Public Domain Mark

Credit: The American text-book of operative dentistry / In contributions of eminent authorities. Ed. by Edward C. Kirk. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

    127/864 (page 125)
    give off a great many fine brandies passing through the matrix in all directions from tubule to tubule. These branches are so numerous that in sections which have been mounted in such a way as to leave air in them, or if the tubules have been filled with coloring-matter, they give the impression of looking through a hazel bush ; or they may be likened to the fine rootlets of a plant. These fine branches are shown in Fig. 105, and the character of the dentin in the root portion is to be compared with that in the crown portion as shown in Fig. 102. The Fig. 108. Granular layer of Tomes: i, lacunae of cementum ; G/, granular layer of Tomes; 7gi, interglobular spaces. (About 200 X.) outermost layer of the dentin next to the cementum contains many small irregular spaces, which connect with the dentinal tul)ules and give to the tissue when seen with low powers a granular a])]K'arance. This layer was first described by John Tomes as the granular layer, and has since been usually called the f/r(inu/(ir layer of Toiiief^. The spaces of the granular layer are probably filled by the enlarged ends of the den- tinal fibrils. The same appearance is sometimes seen beneath the enamel, but is never as well marked as next to the cementum. The dentin at the dento-enamel junction seldom presents a smooth surface, but the inner surface of the enamel plate shows rounded pro-