US973408A

US973408A - Dental apparatus.

Info

Publication number: US973408A
Application number: US52799109A
Authority: US
Inventors: John C Corcoran
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-11-15
Filing date: 1909-11-15
Publication date: 1910-10-18
Anticipated expiration: 1927-10-18

Description

J,. G. GORGORAN. DENTAL APPARATUS. APPLYIOATION FILED NOV. 16, 1909.

Patented 0ct.'18,19 10.

2 Snnmwmnm 1.

J. 0., GORGORAN.

DENTAL APPARATUS. APPLIOATION FILED NOV. 15, 1909.

Patented Oct. 18, 1910.

2 SHEBTB-SHEET 2 JOHN C. CDRCORAN, OF ST. PAUL, MINNESOTA.

DENTAL ALPPARATUS.

Specification of Letters Patent.

Patented Got. 18,1910.-

Application filed November 15, 1909. Serial No. 527,991.

To all whom it may concern:

Be it known that 1, JOHN C. OoRooRAN, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Dental Apparatus, of which the following is a specification.

My invention relates to improvements in dental apparatus, designed for use in making crown attachments for removable bridges, and has for its object to provide apparatus whereby the various operations required can be conveniently, expeditiously and accurately performed.

The apparatus is particularly adapted for use with the sectional crown attachments shown in my application for United States Letters Patentfiled June 29th, 1909, Serial Number 505,051.-

To this end the invention consists in the features of construction, combination and arrangement of parts hereinafter particularly described and claimed.

In the accompanying drawings forming part of this specification, Figure 1 is a perspective view of the apparatus shown supporting a model or cast of a patients jaw; Fig. 2 is a perspective view of a jaw model, showing the use of the paralleler; Fig. 3 is a perspective view of the transfer instrument, shown in engagement with the lower sections of the crowns; Fig. 4 is a perspective view of a complete upper section of a crown; Fig. 5 is a perspective view of the upper section before the top has been placed thereon; Fig. 6 is a cross section on line w-m of Fig. 1; Fig. 7 is a section on line Q 2 of Fig. 1; Fig. 8 is a section on line .2-2 of Fig. 1; Fig. 9 is a sectional detail of the adjustment elements for adjusting the position of the transfer instrument; Fig. 10 is a perspective view of a bridge built upon crown attachments constructed by the use of the apparatus; Fig. 11 is a perspective detail of one of the lug-bearing disks or plates; and Fig. 12 is a vertical section through one of the upper crown sections shown in Fig. 5.

As shown in the drawings the apparatus "comprises a frame 2 arranged to stand upon the work table. Upon this are supported in cooperative relation an articulator, a paralleler, and a transfer instrument.

The articulator comprises a lower jaw member A and a cooperating upper jaw member B. The lower jaw member A has sliding support in the tubular guides 3, and

can be held in adjusted position by means of the thumb nut 42. The upper jaw member has sliding support in the tubular guides 4 of the frame 43, and can be held in adjusted positions by means of the adjusting nut 44. The frame-43 has swinging support upon a cross bar 5, which itself has horizontal sliding support upon the rearWardly extending plns 6. The cross bar is held normally pressed forward by means of coil springs 7 interposed between the bar and the outer ends of the pins. Thus the upper articulator jaw B can be adjusted back and forth in .the guides 4, and instead of swinging upon a rigid pivotal support, has elasticity of movement back and forth to correspond with the movement of the jaws of a human being. By the use of this mechanism the bite of the patient can be reproduced, when the east of the mouth is placed upon the articulator jaws, as hereinafter described.

The paralleler comprises a horizontal shaft 21 which is slidingly and revolubly supported in a tubular guide 22 at the top of the frame. It is held in adjusted positions by means of an adjusting nut 23. This rod terminates in a head 45, in which is revolubly supported a horizontal shaft 46, which can be held in adjusted positions by means of a wing nut 26. The shaft 46 carries a vertical tubular guide 24 in which the vertical arm 25 of the paralleler has sliding support. The tubular guide 24 is in the form of a split ring or pinch collar, and the vertical arm 25 is held in adjusted positions in it by tightening the wing nut 27 upon the flanges of the split ring or pinch collar. Joined at right angles with the vertical arm 25 is a horizontal swaying bar 28 upon which is slidingly supported a cross head 29. The bar 28 is formed longitudinally with a slot 38 into which projects the end of a screw 34 threaded through the cross head, whereby the cross head is held from turning. This cross head carries a vertical tubular guide 80 in which is slidingly supported a chuck 32, which is held in adjusted positions by means of an adjusting screw 31. To secure a fine adjustment back and forth, the cross head is arranged to be moved backward and forward by means of a screw 35 rotatably supported by the arm and threaded through the cross head. The screw is operated by means of a finger piece 36. By means of the various sliding and rotative connections and supports, the paralleler-c'huck can be adjusted at any desired angle, and moved to any desired position with reference to the articulator jaws, and when all the thumbnuts are set in binding position except the wing nut 27, the arm 28 can be swung across the articulator model so as to bring the chuck into various positions, all of which will be parallel to each other.

The transfer instrument consists of an angle bracket 9 which has vertically sliding support in the upward portion 10 of an angle bracket 11, which is horizontally slidable upon the rearwardly extending plate 12 of the main frame. The two sliding brackets are held in adjusted positions by means of the adjusting

screws

13 and 14, respectively. Pivotally and slidably mounted upon the forwardly extending horizontal member of the angle bracket 9 are a plurality of slotted leaves 15, which can be bound together by means of a thumb nut 17 which .works upon a vertical screw 16 passing through the leaves and the horizontal member of the angle bracket 9. Each leaf carries at the end a screw 18 corresponding in size with the interiorly threaded holes in the lugs 48 of the crown attachments, as hereinafter explained.

In using this apparatus to prepare the crown attachments for the bridge, the roots in the patients mouth are first prepared and fitted with bands 37. A plaster impression of the mouth is then taken and the bands removed from the tooth roots and placed on their respective positions in the impression. From this impression is cast a model, which is then firmly secured upon the articulator jaws. In the drawings I have shown for the purposes of illustration a model 38 of one of the patients jaws secured upon the lower jaw of the articulator. After the model has been cast, the bands are placed over the plaster projections 39, which correspond with the prepared roots in the patients mouth. The upper jaw of the articulator is then adjusted to the lower jaw so that the bite of the model jaws will correspond with the bite of the patient. When the adjustment has been made, the nuts 42 and 44 are tightened so as to hold the jaw in adjusted position to retain the length of bite. Complete gold crown attachments, comprising the separable parts shown in Figs. 11 and 4, of the requisite length and size, are then placed upon the bands. The paralleler is then moved around to all of the banded projections to determine the angle at which the crown attachments must be set. IVhen this has been determined, the paralleler is firmly set, by means of various thumb screws hereinbefore de scribed, so as to permit of no movement except that of the swaying bar 28 which carries the perpendicular chuck for securing adaptation. It will be understood that the crowns are intended to form the abutments for supporting a bridge 49, such as that illustrated in Fig. 10, which carries the in-- termediate suspended artificial teeth 50.

The bridge is built up upon the upper crown v sect-ions illustrated in Figs. 4 and 5, so as to be integral with them. These upper crown sections comprise an open topped shell 51 formed in its bottom with a central upwardly extending socket 52 which is constructed to fit snugly over the lug 48 of one of the lugged disks, which, for convenience, may be called the lower crown sections. In order that the bridge may be removable from the mouth, it is necessary that all of g the lugs should be parallel, so that the upper crown sections with the bridge plate built upon them may be lifted off without binding. It is to secure such parallelism of the lugs that the paralleler is used. WVhen the lower crown sections have been finished and are in position upon their respective plaster roots, the transfer instrument is adjusted by means of thesliding elements hereinbefore described so as to bring the screw of each leaf into alinement with the threaded hole in one of the lower crown sections. The screws are then screwed down into the holes, and the thumb nut 17 is tightened so as to hold the leaves firmly in the same relation to each other. The transfer instrument is then removed from the frame by unscrewing the thumb nut 13 and lifted from the model 38, carrying with it the crown sections at the ends of the leaves.

The transfer instrument is now inserted into the patients mouth and the crown sections are fitted down over the respective roots. The screws of the transfer instrument are then unscrewed from the crown sections, leaving the crown sections in the mouth upon the roots to which they belong. A new impression of the mouth is then taken, and, after the crown sections have been removed from the teeth and placed in their proper positions in the impression, a new model is cast. The cast is placed upon the articulator and the lower crown sections fitted upon the root projections of the model. of the upper crown sections is then cletermined, by manipulating the articulator,

The shape of the tops and the tops are soldered upon the open ends of the upper crown sections. The upper sections are then secured removably to the lower sections by means of screws 54-. which go down through the upper crown section into the holes in the lugs, as illustrated in Fig. 4:. The crowns are then ready for the construction of the bridge, which is not involved in the present invention.

I claim as my invention:

1. In dental apparatus for making ercwn attachments, the combination with a frame, of an articulator supported thereon, and a transfer instrument slidably supported upon the frame over the articulator and provided with adjustable leaves having means for engaging crown attachments.

2. In dental apparatus for making crown attachments, the combination with a frame, of an articulator supported thereon, a transfer instrument having sliding support on the frame in position to be moved over the articulator and into engagement with a model held thereon, and a paralleler also movably supported in the frame in position to be moved over the articulator, and adjustable at any desired angle.

3. In dental apparatus for making crown attachments, the combination, with an articulator, of a transfer instrument having sliding support at the rear of the articulator in two perpendicular planes and provided with a pin and a plurality of slotted leaves working upon the pin.

a. In dental apparatus of the class described, the combination, with a frame, of

an articulator carried thereby, a paralleler also carried by the frame and having sliding and rotative support thereon, said paralleler having a horizontally swaying arm, a chuck holder longitudinally slidable upon said arm, and an adjusting screw carried by the arm and threaded through the chuck- ,holder for adjusting the same back and forth.

5. In dental apparatus for making crown attachments, the combination, with a frame, of an articular carried thereby, a paralleler also carried by the frame and having sliding and rotative support thereon, and adjustable at any desired angle, and a transfer instrument supported upon the frame between the paralleler and articulator and slidable in two perpendicular planes.

(5. In dental apparatus for making crown attachments, the combination, with a: frame, of an articulator supported thereon, a trans fer instrument also supported upon the frame, and having sliding support in two perpendicular planes, a pin carried by the.

transfer instrument, a plurality of slotted leaves fitting over said pin, and a thumb nut threaded upon said pin and adapted to bind said leaves together in adjusted positions.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN C. GORCORAN.

Witnesses:

ARTHUR P. LOTHROP, H. SMITH.