A dictionary of dental science, biography, bibliography, and medical terminology / by Chapin A. Harris.

  • Harris, Chapin A. (Chapin Aaron), 1806-1860.
Date:
1849
Catalogue details

Licence: Public Domain Mark

Credit: A dictionary of dental science, biography, bibliography, and medical terminology / by Chapin A. Harris. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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forceps which the author has found very valuable. When a metallic pivot is used, the end going into the artificial crown may be fastened in either of the following ways, namely: first, by cutting a screw on it, either with a file, or by passing it through a screw-plate; the cavity in the crown should next be filled with a wooden tube, and this then screwed into it. Second, by filling the cavity in the crown with pulverized borax, moistened with water, inserting the end of the pivot into it, which should be large enough to fill the cavity, placing several small pieces of solder around it, and applying heat to the tooth by means of a blow-pipe and lamp until it fuses and flows down around it into the tooth. The solder by adapting itself, when in a state of fusion, to the rough walls of the cavity in the crown of the tooth, will prevent the pivot from loosening or coming out. The latter method we consider preferable to the former. The projecting part of the pivot should be about half an inch in length, square and pointed. The cavity in the root of the tooth, which requires to be deeper for a metaUic than for a wood pivot, should be filled with wood, with a small hole through the centre. Into this, the end of the pivot should be introduced and forced up, in the manner as before described, until the tooth and root come firmly together. But when a metaUic pivot is used, a plate-tooth is preferable to those which are made expressly for pivots. The manner of attaching a pivot to one of the former, is as follows: the root should be first prepared in the manner as before described; after which, an impression should be taken in wax, from this a plaster cast should be taken, and from the latter metallic casts. This done, a piece of gold plate large enough to cover the root, should be swaged up between the metallic casts, a plate- tooth of the proper size, shape and color, should then be fitted to the root. backed with gold, and soldered to the plate previously fitted to the root, and to the upper or convex surface of this last, and immediately beneath the canal in the root, a gold pivot should be attached. But, for the manner of conducting these various processes, see Mounting Porcelain Teeth upon a Me- tallic Base. The author has been in the habit, for a number of years, of-using a pivot, consisting of gold encased in a thin layer of wood. It is made in the fol- lowing manner : the gold is first made into wire of the proper size, and passed through a screw-plate. A hole is then drilled lengthwise into a piece of well seasoned hickory as far as is required for the length of the pivot. Into this the wire is screwed, and then cut off close up to the wood, which is reduced with a file or knife, to the size of the orifice in the artificial crown, and firmly forced into it. The projecting part of the wood, to the termination of the wire, is trimmed down to the size of the cavity in the root, and cut off, when the tooth is ready for insertion. This kind of pivot, he conceives to be, in many respects, preferable to either of the others. The wood pre- vents the gold from enlarging the cavity of the root, or that of the artificial tooth; and, at the same time, by the swelling of the wood, the pivot is firmly re- tained in both. The gold keeps the ar- tificial tooth from being moved, as of- ten happens, when a wood pivot alone is used, after it becomes saturated and softened with the juices of the mouth. The gold employed for pivots should be eighteen carats fine, and the wood which we have found best suited to the purpose, is firm, close-grained, and well seasoned hickory. The cavity in the root should be cleansed from all ex- traneous matter, previous to the inser- tion of the tooth. The artificial crown should be first fitted to the root with a temporary pivot of soft wood, in order the more