DE7138855U - Device for the production of synthetic resin oral prostheses by die casting or injection molding - Google Patents

Description

Andrejewski, Honke & Gesthuysen patent attorneys Graduate physicist Dr, Walte; Andreevsky

Graduate engineer

Dr.-lng. Manfred Ho .. ^ e

Engineer Anwolfcakte: 37 73o / ve- _{Hans Dieter} Gesthuysen

4300 Essen, December 15th, 1971

Theaterplatz 3

Utility model registration

Karel CLAES, 35oo Hasselt (Belgium)

"Device for the production of synthetic resin oral prostheses according to the die casting or injection process "

The invention relates to an apparatus for manufacturing of artificial heart oral prostheses according to the die-casting or injection process, consisting of upper and lower Half-grouches who are sitting on top of each other with splashing around. Die casting or injection process means in the context of production of synthetic resin oral prostheses, a process in which the oral prosthesis is first pre-modeled from wax. the The oral prosthesis made of wax is then cast in plaster of paris in the upper and lower half-muffle. It will First, cast the oral prosthesis in the lower half-muffle. After placing a protective layer on the plaster of paris is the upper half-muffle is poured with plaster of paris. The wax is then removed by boiling water or the like.

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen, TheaJarplatz 3

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The cavity is filled or injected with synthetic resin. the Polymerization of the synthetic resin takes place through heating, e.g. by immersing the half-muffles filled with plastic in a hot water bath instead.

In the device of the type described is disadvantageous that the two metal half-muffles under the Influence of the warmth of the water bath expand. In addition, the two half-muffles are polymerized by ion pressure Resin (approx. 30 kg / cm) from each other by 0.05 - 0.1 lomm pushed away. After the injection, the high pressure of the plastic (45o - ooo kg / cm ") causes the plaster of paris to be about 0.2 nini äüöäfliincrigeui'üclCt. Dös 8.1 iöö conditional / öiriö disadvantageous postponement the purchase surface level, which leads to cumbersome regrinding work.

The invention is based on the object of providing a device for the production of synthetic resin oral prostheses according to the one described To create die-casting or injection processes which, when used, prevent the described shift in the level of the occlusal surface can be.

The invention is based on a device of the type described at the outset Genus. It consists in that a compensating ring is removably arranged between the splashes. After preferred Ausfüiirungsform the invention is the balance ring than 0.5 0.25 Executed mm thick metal ring, this ring having a width which corresponds at least to the width of the paddles.

Andrejewski, Honk & Gesthuysen, patent attorneys, 4300 Essen, Theaterplatz 3

DlC · ΞΓΓΐΓϊαΐίΓίΞ £ ~ δ ~ - ^ - "" "- ·" - do he f ^ mHfi 1 does a new job = wise in the manufacture of synthetic resin oral prostheses. All deviations caused by expansion become systematic switched off. A post-processing of the finished synthetic resin oral prosthesis is therefore no longer necessary. - All of this is explained in the following on the basis of just one exemplary embodiment The illustrative drawing is described in more detail, it shows:

1, 2, 5 schematically and in section a known device for the production of synthetic resin oral prostheses with the resulting shift in the sales area level and

FIG. K - 6 a device according to the invention in section and the avoidance of the displacement of the chewing surface level in a device according to the invention.

In Fig. 1, the main parts of a conventional device for the production of synthetic resin oral prostheses with the most important parts for the production of the oral prosthesis schematicx-wise reproduced.

The device has two half-muffles 1 and 2, the bottom of which has at least one opening 3 or 4, and the one with it not here drawn, in and per se known means for their connection via flanges 5 and 6 are equipped.

The basic model 7 of an oral prosthesis to be produced is made by embedding it in a plaster of paris compound 8, the surface of which is preferably with the surface of the flange 6 of the half muffle 2 concerned, fastened in such a half muffle.

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen-7r «aterplatz SDCLaΛ.u 1 'uiT'iilocrxx I ι ^ Γα ^ Ό UaS VüimOucixiSi to Via.0iiafilOu £ ll

which carries the teeth Io of the oral prosthesis to be produced. After the gypsum mass 8 has set, the parting surface of the half-muffle 2 is covered with a protective layer 11, whereupon the second Half-muffle 1 with the first half-muffle 2 by combining the two planes 5 and 6 by means of screws or the like. connected. The interior of the half muffle 1, i.e. the space above the protective layer 11 and the wax moss 9, is then placed with one, for example through an opening 5 supplied Plaster mass 12 filled.

There is also the option of pre-arranging the foregoing Halbmuffel i the pre-modeled wax model 9 in one To include plaster of paris 15, which in turn after the attachment the upper half-muffle 1 on the lower half-muffle 2 is coated with the plaster of paris compound 12.

If necessary, a side wall of the half-muffle 1, 2 with one that is only shown schematically here is preferred Injection opening 14 arranged transversely with respect to the connection plane between the planes 5 and 6.

After the gypsum masses 8 and 12 have hardened, the two half-muffles become 1 and 2 away from each other and is the half-muffle 1 containing the pre-modeled wax model 9 in one Warm water bath, preferably in a boiling water bath, in order to remove the wax from the gypsum masses 12 and 13. The cavity created in this way is either filled with synthetic resin, whereupon the half muffle 1 and 2 over their paddles 5 and 6 are connected to one another, or the half-muffles

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen, Theaterplatz 3

and 2 only become 5 and 6 with one another by means of their puddles

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is splashed. The muffle is put into a warm water bath, for example, to accelerate the precipitation process submerged. '

The FIg. 2 explains the vertical displacement of the cream Io in With reference to the basic model 7 in the production of oral prostheses with a known device, i.e. when performing in which the cavity created by the removal of the wax model 9 is filled with synthetic resin before the two half-muffs Gl 1 and 2 are joined together.

In Fig. 2 the teeth Io are at the height A in Mn onto the basic molded part after the gypsum compounds 12 or 13, in this position the expansion through the one another clamped half-muffles 1, 2 is prevented. B is the location of the teeth after the artificial resin has been compressed by the two half-muffles 1 and 2 clamped on top of each other, which position B, as can be seen, corresponds to the aforementioned position A.

Finally, C is the height of the teeth Io after the polyolysis of the synthetic resin, which position on the one hand due to the expansion of the metallic half-muffles in the warm water bath and on the other hand due to the expansion of the synthetic resin during the polymer! ons process is achieved. As a result of Ausde of metal half muffles hnung rises so the mass of plaster 12 situated in the half muffle from 1, because it is slightly lifted by the pressure of the resin.

All of this leads to a vertical displacement a of the teeth Io with respect to the base molding 7, which is, for example, approximately 0.05 mm - a not insignificant shift »

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Andregewski, Honke & Gast huy sen, patent attorneys, 4300 Essen, Theuterplatz

which results in a significant increase in the sales area level.

3 explains the shift in the level of the chewing surface in the production of oral prostheses, the machined model 9 after its removal by injection of synthetic resin through the Injection opening i4 after clamping the two half-muffles together 1 and 2 is moved. The teeth Io are now at level A with respect to the base molding after setting the plaster of paris, whereby any expansion is prevented by the half-muffles clamped on top of one another.

B is the height of the teeth Io with respect to the base molding 7 after the expansion of the muffle in the warm water bath, while C the end position of the teeth after the end of the polymerization process is in the resin compound. In this case the total vertical displacement of the teeth is Io with respect to the basic model about three times as large as the distance a in the previous case and is thus about 0.15 mm, which is a very means a large increase in the purchase area level.

From FIGS. 2 and 3 it can be seen that in the manufacture of the prosthesis with injection of the synthetic resin, the increase in the occlusal surface level is significantly greater than with die casting the oral prosthesis. This is the reason why the injection of the synthetic resin is still used relatively little, despite its great advantages, which among other things allow a significant acceleration of the manufacturing process.

The distance a in FIGS. 2, 3 and 6 is for the sake of clarity Drawn on an enlarged scale.

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen, Thoaterplati 3

In Fig. 4 is a device according to the invention for Oral prosthesis production shown.

In this case too, a base molding 7 embedded in a plaster of paris compound 8 is assumed, with a protective layer 11 being poured onto the plaster of paris compound 8 after it has hardened, whereupon the second half-muffle 1 is combined with the first and the pre-modeled wax model 9 in a plaster of paris compound 12 or . is embedded in the gypsum masses 12 and 1J>.

According to the method improved according to the invention, however, according to the expansion of the muffle, the expansion of the plaster, the compressibility of the plaster, the type of synthetic resin selected, the volume of the various materials, the temperature and the pressure, between the puddles 5 and 6 clamped on each other the Hal'omuffeln 1 and 2, in front of the arrangement of the plaster of paris 12, a suitable compensating ring 15 is arranged, which has at least the same width as the two flanges 5 and 6 and extends over the entire circumference of the same, after the arrangement of this compensating ring 15 the plaster of paris 12 and possibly also the Gipsraasse IJ> is arranged. The width of the compensating ring 15 corresponds at least to the width of the two flanges 5 and 6 with regard to a very precisely coincident elevation between the two half-muffles. After the plaster of paris has set (hardened) and the wax model 9 has been removed, the half-muffles 1 and 2 are combined with their flanges 5 and 6, but now without the interposition of the compensating ring 15.

This has the consequence that each of the loosening of the plaster of paris 12 causing Expansion of the half-muffle 1 daduroh systematically

713185524 «2.72

Andrejewski, Honke & Gesthuysen _r Patentanwcilte, 4300 Essen, Theaterplatz

it is avoided that when the half-muffles 1 and the plaster of paris is somewhat compressed over its entire surface will until the puddles 5 and 6 touch each other. As a result It is recommended not to use hard plaster, but rather the more compressible alabaster plaster or Parisian plaster.

All this has the consequence * that the teeth Io with respect to the Base molding by a certain value (approx. 0.15 mm in present Pail) until position B (Fig. 6) is reached be moved below.

The synthetic resin 16 is then injected under relatively high pressure! whereby the plaster of paris is compressed a second time is, i.e. by about 0.1 mm in the area of the teeth, which are then shifted upwards again until they are reached the position D (Fig. 6).

Finally, the half-nuffles 1-2 are immersed in a warm water bath to accelerate the polymerization process Half-muffles expand, on the one hand under the influence of heat and on the other hand as a result of the polymerization of the Synthetic resin, since the polymerization process takes a pressure of about Jo kg / cm generated. All of this leads to the fact that with the right choice the thickness of the compensating ring 15 concerned, the teeth are finally in position E (Fig. 6), which is the original Position A corresponds to.

The device according to the invention therefore enables a

Andrejewtκι, Honke & Gesthuysen, patent attorneys, 4300 Essen, Theaterplatz

systematic elimination of the undesired increase in the occlusal surface j levels and thus the production of flawless, suitable synthetic resin oral prostheses that cannot be re-grinded.

The thickness of the compensating ring 15 is determined each time by experiment © according to the expansion of the materials used, the compressibility the plaster of paris, the volume of the materials and the pressure.

The invention is of course in no way restricted to the exemplary embodiment described above and explained by the accompanying drawings, but also relates to all modifications, additions and adaptations of the same, provided, of course, that the scope of the invention is not exceeded.

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Claims (2)

Andrejewski, Honke & Gesthuysen, patent attorneys, 4300 Essen. Theaterplatz - Io - Protection claims: 1. Device for the production of synthetic resin oral prostheses after die casting or injection process, with upper and lower half-muffle., which are placed on top of each other with splashing, characterized in that between the flanges (5 * 6) a compensating ring (15) is removably arranged » 2. Device for the production of synthetic resin oral prostheses according to claim 1, characterized in that the compensating ring (15) is designed as a 0.05-0.25 mm thick metal ring and has a width at least equal to the width of the flange. 713185524,2.72