A text-book of dental histology and embryology : including laboratory directions / by Frederick Bogue Noyes ... with 350 illustrations and 19 plates.

  • Noyes, Frederick Bogue, 1872-1961.
Date:
1912
Catalogue details

Licence: Public Domain Mark

Credit: A text-book of dental histology and embryology : including laboratory directions / by Frederick Bogue Noyes ... with 350 illustrations and 19 plates. 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.

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    tlu'v may be carried through the usual process, embedded ill ])araffin, and sectioned. Human Pulps.—By the cooperation of the extracting room human })ulps for liistoh)gical work may be obtained. As soon as extracted the tooth should be wrapped in a gauze napkin, placed in the jaws of a heavy vise, which is carefully tightened until the tooth cracks. The same thing may be accomplished by a heavy hammer on an anvil. A few trials of this will enable one to crack the tooth so that the pulps may be easily remo\'ed without injury. The cracked tooth is put in Miiller's fluid and formalin for twenty-four hours, when the pieces of dentine are removed and the pulp care- fully lifted out of the pulp chamber. It is then carried through the regular process, embedded in paraffin, and sectioned. If the teeth are not perfect clinical history should be noted. Periosteum.—Young kittens that have not attained their full growth may be used for this purpose. The bone should be very carefully dissected so as not to injure the periosteum and then sawed in pieces, using a fine metal saw. It is usually best simply to saw it in two at the middle of the shaft and to fix it in Miiller's fluid and formalin. After fixing and washing, it should be cut in small pieces and decalcified in 2 to 5 per cent, nitric acid. A comparatively large volume of acid should be used and a pad of cotton placed in the lower half of the bottle, or the tissue suspended by a thread. It is best to change the acid once a day. Decalcification may require from two days to a week, and should be tested by passing sharp needles through the tissues. As soon as decalcified the tissue should be washed for twenty-four hours in running w^ater, carried through the grades of alcohol, and embedded in celloidin. The sections should be cut at right angles to the shaft. Peridental Membrane.—For class work the peridental mem- branes of sheep are the best for study, as their fibers are large and their direction easily observed. They are much better than those of either cat or dog, in which the fibers are much finer and the bone more dense. The jaws are brought from