US1549487A - Dental tray - Google Patents

Description

Aug. ll, 1925.

1,549,415? s. R. HANDYSIDE DENTAL TRAY Filed not. 2?-, '1921 ATTf JEY.

Patented Aug. l1, 1925.

u1u-rusa. srafirgsfs .simon ROBERT HANDysrnn, or SAN FRANCISCO,0 CALIFORNIA.

DENTAL TRAYJ- l i To' @ZZ/whom it 'may concern.:

Be it known that I, SIMON R. I-IANDYsIm-1, a citizen; `of jthe. UnitedfStates,e.4 residing at San Francisco, in the county of San Francisco, State of California, have invented a new and useful Dental Tray, of which the following is a specification in such full and clear terms as will enable those skilled in the art to construct and use the same.

This invention relates to a dental tray and one of its objects is to provide means to prevent the compound used for taking the impression of the mouth from flowing over the back of the tray when the impression is being taken.

A further object of the invention is to provide means whereby the depth of the material forming the cast will be prevented from being thinner than a predetermined minimum.

A further obj ect of the invention is to pro vide means whereby the impression made will be suitably lined or grooved in order that it may be separated into several parts and thereby more easily removed from the mouth than it would be if attempted to be removed after the cast has been made in a single piece.

A further object of the invention is to provide the tray with a sufficiently resilient bottom to permit it to accommodate itself to irregularities of different mouths, while at the same time maintaining a thickness of the cast above the given minimum.

A further object of the invention is to provide a tray with a resilient edge around its outer edges which will aid the operator in producing good casts by preventing the overflowing of the casting material at the edges of the tray.

Other objects of the invention will appear as the description proceeds.

An embodiment of the invention is shown in the accompanying drawings in which the same reference numeral is applied to the same portion throughout, but I am aware that there may be modifications thereof.

Fig. 1 is a plan view of one form of the tray.

Fig. 2 is a sectional view of the tray.

Fig. 3 is a plan view of an ordinary form of tray with the production beads formed therein.

Fig. 4L is a view of the tray shown in Figure 3 looking from the right hand side, and

Fig. y5 .isa sectional viewv ofoneportionof theutray .shownin Figure 3f Thetray-has a handle,` 1 and :consists of` a, sheet of thin metal formed to produce a horse-shoe like retaining groove indicated at 2 with a raised central portion 3. In the bottom of the tray there is secured a body of suitable resilient rubber 4. This rubber has a horse-shoe like raised rib 5 extending around its outer portion, a medium raised rib 6 and two laterally raised ribs 7 and 8. The rubber body used in t-he form of the invention shown in Fig. 2, is more or less porous spongy rubber in its lower portion, while the upper part is more dense, as indicated at 9, in that cross-section.

The front and side edges of the tray are provided with a rubber strip 9 which is sufficiently resilient to come in contact with the inside of the mouth and gums and prevent the loss of the casting material over the top of the tray, and which forms the surface of the less dense body of rubber used at the bottom of the tray.

At the back of the tray there is a raised rubber' dam 10 which prevents the loss of the casting material at the back of the tray.

Vhen a cast is to be made the tray is covered over with a suflicient amount of the casting material and is placed within the mouth of the person whose impression is to be taken. lhen the tray is pushed up against the teeth, the ribs 5, 6, 7 and 8 prevent the teeth from cuttingy into the impression material deeper than the thickness of said ribs thereby insuring an even depth of casting material all around the tray.

Vhen the material has hardened, the tray may be removed from the cast; whereupon the cast is easily removed from the teeth because it is broken up by reason of the grooves formed by the ribs 5, 6, 7 and 8 into siX different sections, each section may be easily re-assembled after having been removed from the mouth.

In the form of the invention shown in Figures 3 to 5 inclusive, the tray handle is indicated at 12, and the tray is of an ordinary form with a horse-shoe shaped groove 13 to receive the casting material. This groove has a bead 14 in its bottom and a bead 15 at the front extending transversely across the first bead. Rubber dams 16 and 17 are formed at the back of the horse-shoe shaped groove, and both the front and inside edges of the tra-y are provided with a rubber covering as indicated at 18 and 19.

The operation of producing the cast and removing it from the mouth is substantially the same in the 'form of the invention shown in these figures as with the previous orm.

Inorder to aid in holding` the casting material heaped up to lit the center of the mouth7 the center` of the tray is slightly roughened as indicated at 6.

What I claim is as follows, but various modifications may be made in the construction shown in the drawings and above par- Lin the inal cast.

In testimony whereof I have hereunto set my hand this 20th day of October' A. D. 1921.

SIMON ROBERT HANDYSIDE.

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