Vulcanite and Celluloid (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 edition. Excerpt: ...out upon separating, pour boiling water upon it. This leaves the tin upon the plaster. Pack the case and vulcanize. If care has been exercised, the case will be nearly finished, with the exception of removing and polishing where the surplus has been. MoUTHs HAVING SoET PLACES. Dr. C. H. Land described the method of managing these cases, in the DENTAL Cosluos, vol. xxv., page 557, as follows: To secure good results in an artificial denture, a correct impression is first in order and first in importance. Plaster of Paris is, in our estimation, the only material with which a normal impression can be obtained. The various other materials used for the purpose force the muscles and soft tissues out of position, resulting in an inaccurate cast. Having secured a normal impression, ---the negative from which a positive is to be obtained, --it should be considered as representing merely the outlines; the conditions to be noted after a careful study of the parts. With the patient in the chair and the cast in hand, the conditions may be indicated by a series of characters and figures penciled on the cast. For instance, the thickness of the tissues may be represented by figures 64, 32, 16, 8; the sixty-fourth, the thirty-second, the sixteenth, and the eighth of an inch in thickness. Fwill indicate flexible; R, ridged, etc. With such a record an intelligent idea can be formed of the requirements in the particular case, and the necessary modifications will be easily comprehended and accomplished; the adaptation to the hard and soft, rigid and flexible, parts secured; the pressure obtained just where wanted--most in the soft parts, and least in the rigid. In order to trim a cast judiciously, one must have a thorough understanding of the...