A text-book of dental histology and embryology, including laboratory directions . Tlie pit in a incisor filled with coronal cementum. Interglobularseen in the dentine spaces are Fig. 80 Fro. 81. Fig. 80.—Occlusal surface of the lower third molar, showing the 81.—The same tooth sliced for sectioning: 1, the piece from which the sec-tion shown in Figs. 82 and 83 was ground. 116 STRUCTURAL DEFECTS IN THE ENAMEL Some are simply shallow open grooves, in which the surfaceof the enamel is perfect (Fig. 74); some are very deep andentirely empty (Figs. 75, 76, and 78); others are
A text-book of dental histology and embryology, including laboratory directions . Tlie pit in a incisor filled with coronal cementum. Interglobularseen in the dentine spaces are Fig. 80 Fro. 81. Fig. 80.—Occlusal surface of the lower third molar, showing the 81.—The same tooth sliced for sectioning: 1, the piece from which the sec-tion shown in Figs. 82 and 83 was ground. 116 STRUCTURAL DEFECTS IN THE ENAMEL Some are simply shallow open grooves, in which the surfaceof the enamel is perfect (Fig. 74); some are very deep andentirely empty (Figs. 75, 76, and 78); others are apparentlyfilled with a granular, more or less structureless calcifiedmaterial which appears to have been deposited in the grooveafter the enamel was completed (Figs. 79, 84, and 85). Thisis probably of the nature of cementum. It was formed afterthe enamel was completed, but while the tooth was enclosed Fig. 82 M Bfe^ ^t <*r l \ L \ w O w The section ground from 1, Fig. 81, showing the depth of the fissure. in its follicle in the crypt in the bone. It is to be comparedwith the coronal cementum that is characteristic of thecomplex grinding teeth of the ungulates and other herbivor-ous anima
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
