Principles and practice of operative dentistry . Showing varicosed enamel-rods more highly magnified. (After Dr. J. Leon Williams.). Showing varicosed enamel-rods very magnified. (After Dr. J. Leon Williams.) HISTOLOGY OF THE DENTAL TISSUES. 39 2. The limiting force of environment, expressed as a diminution in thesize of the jaws—i. e., the result of altered habits of diet, and also to someextent of natural selection. Nasmyths Membrane.—Covering the enamel of young, newly-erupted teeth is a thin membrane, the cuticula dentis, or Nasmyths mem-brane. This membrane is thought to be formed
Principles and practice of operative dentistry . Showing varicosed enamel-rods more highly magnified. (After Dr. J. Leon Williams.). Showing varicosed enamel-rods very magnified. (After Dr. J. Leon Williams.) HISTOLOGY OF THE DENTAL TISSUES. 39 2. The limiting force of environment, expressed as a diminution in thesize of the jaws—i. e., the result of altered habits of diet, and also to someextent of natural selection. Nasmyths Membrane.—Covering the enamel of young, newly-erupted teeth is a thin membrane, the cuticula dentis, or Nasmyths mem-brane. This membrane is thought to be formed from the outer layer ortunic of the enamel-organ, and measures in thickness from to It is exceedingly resistant to the strongest acids, alkalies,boiling, and maceration, but is soon worn from the teeth by the friction ofmastication. It yields no gluten. (KoUiker), Chemic Composition of Enamel.—Enamel is the hardest structureof the body, and at the same time, by the arrangement and character ofits component parts is capable of great resistance to mechanical force andthe attrition due to the mastic
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
