This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: ...lines, the brown parallel stripes of Retzius, probably due to inequalities in the density of the enamel prisms produced by the successive formation of layers of the enamel. The enamel consists of lime-salts: phosphate, carbonate, and fluoride of calcium with corresponding magnesium salts. In young ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: ...lines, the brown parallel stripes of Retzius, probably due to inequalities in the density of the enamel prisms produced by the successive formation of layers of the enamel. The enamel consists of lime-salts: phosphate, carbonate, and fluoride of calcium with corresponding magnesium salts. In young teeth the free surface of the enamel is covered with a delicate cuticle (the cuticle of Nasmyth), a single layer of non-nucleated scales. In adult teeth this cuticle is wanting, having been rubbed off. 229. The dentine is the principal part of the hard substances of the tooth. It forms a complete investment of the pulp cavity of the crown and fang, being slightly thicker in the former than in the latter region. The dentine is composed of (Fig. 121): (1) a homogeneous matrix; this is a reticular tissue of fine fibrils impregnated with limesalts, and thus resembling the matrix of bone; (2) long fine canals, the dentinal canals or tubes passing in a more or less spiral manner, and vertically from the inner to the outer surface of the dentine. These tubes are branched; they open in the pulp cavity with their broadest part, and become smaller as they approach the outer surface of the dentine. Each canal is lined with a delicate sheath--the dentinal sheath. Inside the tube is a fibre, the dentinal fibre, a solid elastic fibre originating with its thickest part at the pulp side of the dentine from cells lining the outer surface of the pulp, and called odontoblasts. On the outer surface of the dentine, both in the region of the enamel and crusta petrosa, the dentinal Fig. 121.--From a Section through a Canine Tooth of Man. a, Crueta petrosa, with large bone corpuscles; b, interglobular substance; c, dentinal tubules. (Waldeyer, in Strieker's Manual.)...
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