File:Absorption of tooth;The independent practitioner (1883).jpg

Identifier: independentpract05newy (find matches)
Title: The independent practitioner : a monthly journal, devoted to medicine, surgery, obstetrics, dentistry, pathology and popular science
Year: 1883 (1880s)
Authors:
Subjects: Dentistry
Publisher: New York : The New York Dental Association
Contributing Library: Dentistry - University of Toronto
Digitizing Sponsor: University of Toronto

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with a considerably enlarged and split up cement cor-puscle. 31.—Multinuclear protoplasmic mass, sprung from the cementumafter liquefaction of its basis-substance. The large offshoots of this massshow the process of transformation of the basis-substance into medullary cor-puscles. F. C.—Fibrous connective tissue, the result of the liquefaction ofcementum. Magnified 500 diam. In this tissue an active new formation of bony trabecular of bonetakes place, characterized by the presence of large and irregularbone corpuscles. The widened socket, or dissolving surface of anabsorbing provisional tooth, is not infrequently filled with newlyformed bone. The newly formed layer of cementum in part showscircular fields (territories) of bone tissue, each of which may con-tain a varying number of bone corpuscles, or there is a uniformreduction of the original cementum, the boundary of which is 354 Original Communications. made up by regularly arranged medullary corpuscles, so-called os-teoblast-.
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Fig. 2.—absobption of neck op tooth. N.—Dentine of neck of tooth not supplied with canaliculi. D.—Canali-culi of dentine stopping short of the surface of the neck. B.—Bay-like exca-vations in the middle of dentine, filled with a pale and finely granulatedprotoplasm, nuclei beginning to appear. C.—Excavation filled with coarselygranular protoplasm, tending toward an active new formation of medullarycorpuscles. M.—Multinuclear protoplasmic bodies, the so-called myeloidcells, in connection with fibrous connective tissue on the surface. Magnified600 diam. On the neck of the tooth the excavations penetrate not only thelayer of the cementum proper, but also the layer of the subjacentdentine, which we know to be destitute of dentinal canaliculi. Hereagain we observe at first a dissolution of the basis-substance inglobular fields, which appear filled at first with a finely granularprotoplasm, lacking nuclei, afterward with usually nucleated med-ullary corpuscles, and at length wit

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