US1199647A - Dental impression-tray. - Google Patents

Description

- M; ACKERMAN. DENTAL IMPRESSION TRAY."

APPLICATION FILED FEB. 3 i916.

1 1 99,647 Patented Sept. 26, 1916.-

Inventor Attorneys MAURICE ACKERMAN, on NEW Y RK, N. Y.

DENTAL IMPRESSIONi-TRAY. I

Specification of Letters Patent.

PatentedSept. 26, 1916.

Application filed February 3, 1916. SerialNo. 75,999.

To all whom it may concern:

Be itknown that I, MAURICE AOKERMAN, a citizen of the United States, residing at New York, in the county of New Yorkand- State of New York, have invented a new and useful Dental Impression-Tray, of which the following is a specification.

This invention relates to dental impression trays, one of its objects being to provide a tray formed in one piece and which has a novel arrangement of ribs whereby grooves are formed in the impression and which grooves are so located that the impression can be broken therealong into five pieces all of which are practically straight so that no difliculty will be experienced in separating them from the teeth.

A further object is to provide the tray with a retaining lip upon the palatal portion whereby soft plaster is prevented from flowing into the throat of the patient.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings :Figure 1 is a plan view of the tray. Fig. 2 is a central vertical section therethrough. Fig. 3 is a rear elevation.

Referring to'the figures by characters of reference 1 designates the base of the tray, the same being of substantially the usual 7 configuration and having a handle portion 2 formed integral therewith and provided with an opening 8 whereby it can be suspended readily from a nail or the like. Extending from this base portion is a flange 4 following the curved margin of the base and inclined relative to said base. Formed on the inner face of the flange 4 is a central rib 5 and at each side of this central rib is a side rib 6. These ribs 5 and 6 extend up to a curved rib formed upon the base of the tray and which is parallel with the flange or wall 4:, said rib being indicated at 7 Formed along the palatal portion of the base is a retaining lip 8. It is to be understood that the flange or wall 4 is to be properly shaped to fit comfortably within the mouth so as to accommodate the levator labii superioris and the condyles. In using the trayit is filled with the plaster to be used in making the impression and is then pressed against the teeth so that the teeth will become embedded in the plaster at points close to the flange or wall 4. The lip 8 will prevent the plaster, if soft, from flowing into the throat of the patient and causing discomfort. Afte the plaster has become set the tray is withdrawn therefrom and the ribs 5, 6 and 7 will leave grooves in the front, sides and bottom of the plaster cast. By forcing the nails of the fingers into the grooves the cast can be broken therealong into five different sections, to wit, two sections on each side of the center and a base section bounded by the grooves formed by rib 7. As four side.

sections are produced each of them will be approximately straight so that it can be removed easily from the teeth without crumbling, thus enabling a perfect impression to be retained.

The lip 8 not only serves to prevent plaster from flowing into the throat of the patient but also serves as a gage for the operator. While the impression is being taken the operator first presses the back portion of the tray into position and should the tray be pressed too far the impression would come out too thin and break easily. With the lip 8, however, the operator can only press down as far as this lip will permit and when the impression is taken out it will be of uniform thickness and not so easily broken by handling.

It will be noted that the entire tray is formed in but one piece so that it can be easily kept sanitary and there are no parts likely to become displaced in handling.

It will be noted that the walls of the tray are so shaped as to accommodate the muscles in the vestibule of the mouth and the condyles all of which is important in the making of a perfect fitting plate. The

base, there being a retaining lip along the palatal portion of the base and constituting a gage, there being a curved rib parallel with the wall of the tray and upon the base,

and additional ribs upon the inner surface of the wall of the tray, one of said ribs being arranged at the center of the Wall and extending from the free longitudinal edge thereof downwardly to the rib on the base 10 and the other ribs being extended down- MAURICE ACKERMAN.

Witnesses:

7M. H. KRUsE, JOHN L. PETERS.

Gopies of this patent may be obtained for five cents each, .by addressing the Commissioner of Patents,

- Washington, D. 0.

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