Improvements in devices for use in taking dental impressions / [Herman Dagett Osgood].

  • Osgood, Herman Dagett.
Date:
1901
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in devices for use in taking dental impressions / [Herman Dagett Osgood]. Source: Wellcome Collection.

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    N° 4628 A.D.1900 Date of Application, 10th Mar., 1900 Complete Specification Left, 10th Jan., 1901—Accepted, 16tn Feh., 1901 PROVISIONAL SPECIFICATION. Improvements in Devices for use in taking Dental Impressions. I, Herman Dagett Osgood, of No. 372, Boylston Street, in the City of Boston, County of Suffolk and State of Massachusetts, TTnited States of America, Dentist, do hereby declare the nature of this invention to be as follows: — This invention relates to appliances used by dentists in taking an impression J of the roof of the mouth and the adjoining parts. The invention has for its object to provide a cup adapted to retain the plaster displaced while the impres¬ sion is being taken, thus preventing the displaced plaster from falling into the throat of the patient, and capable of being easily taken apart to be cleaned. My improved cup comprises two general parts, namely, a bod}* portion, which includes a bottom plate, and a U-sliaPe(l flange Dsing from the margin of said plate, and an arched plate having its margin formed to fit the inner surface of the flange, said plate including a flat or seat portion adapted to rest on the bottom plate of the body of the cup, and an arched portion which is formed to approxi¬ mately fit the roof of the patient’s mouth. The arched portion is struck up from *5 the body of the blank from which it is made, said arched portion having no bottom. A flange is formed on one end of the arched plate, said flange filling or nearly filling the opening between the ends of the flange when the two parts are assembled. The flange is nrovided with a series of inwardly projecting pins or lugs which 20 project over the bottom plate and are in position to bear upon the upper edge of the marginal nortion of the arched plate when the two parts are assembled, the pins holding the marginal portion of the arched plate in close contact with the bottom plate. The arched plate has an opening which when the parts are assembled forms the mouth of a cavity or chamber adapted to receive the surplus 25 plastic material used in making an impression of the roof of the mouth. A vent¬ hole is formed in a wall of the cavity or chamber and preferably in the said bottom plate, its object being to permit the air in said chamber to be displaced by the plastic material which enters the chamber, thus permitting the plastic material to freely enter the chamber. When the device is used, the arched plate 30 is placed upon the bottom plate, and a dam is formed by placing a strip of wax or other suitable material against the inner side of the flange of the arched plate, said strip extending outwardly beyond the ends of the U_slial)0(l flange of the body portion. The pins hold the arched plate down upon the bottom plate of the body portion; but if desired, this may be supplemented by small pieces 35 of wax placed, when melted, in the angle formed by the (J-sliiiped flange and the marginal portion of the arched plate; thus holding the latter securely. After the use of the cup the dam is lemoved, and the two parts are separated, so that all portions of the surfaces may be easily cleaned. Dated this 10th day of March 1900. V HASELTINE, LAKE & Co., 45, Southampton Buildings, London, W.C., Agents for the Applicant. [Price &/.] 40