DE8108695U1 - MUFFLE INSERT FOR DENTAL TECHNOLOGY - Google Patents

Description

Muffle insert for dental technology

The invention relates to a muffle insert for dental technology for the production of denture parts or tooth frameworks on the way of the investment casting in a hollow form, which by a model which can be melted out, for example made of wax, in one of a cylindrical side wall of the Investment material surrounded by the muffle insert is determined.

Lashing To produce tooth models, ceramic ovens with firing openings are usually used that Xuffel insert was brought in with its investment material will; the heat melts the intermediate model, so that the hollow shape for receiving the cast metal is created.

The usual vessels with an annular cross-section require a higher one. Consumption of investment material after the investment casting removed and then present as waste.

R-122 - 2 -

In addition, the known muffle inserts Known disadvantage of uneven heating.

In view of these circumstances, the inventor set himself the goal of using a muffle insert of the type mentioned at the beginning Art to be designed in such a way that the use of investment material is reduced and energy consumption is reduced. About that In addition, a uniform heat transfer to the casting center should be possible.

To solve this problem, the side wall has a wall of approximately oval cross-section of an inner vessel surrounds and approximately half-moon-shaped chambers are provided between the side wall and the vessel wall. However, it is also within the scope of the invention to have the cross section of the inner vessel in the shape of a banana or a bean shape, whereby one of the chambers has a bulge in addition to its crescent-shaped cross-sectional area receives, which further favors the heat supply to the casting center.

Thanks to this design - compared to conventional muffle inserts - more than a third of the investment material saved and not only reduced the amount used, but also the resulting waste η in more environmentally friendly Way significantly restricted.

Since with a muffle insert with a circular cross-section, the distance to the casting area is obviously very uneven is, the investment material forms a shell due to the different thickness, which leads to an equally uneven Heat distribution leads. Here, too, a remedy is provided because the investment material that is present around the casting cavity is stretched heat can now be applied more evenly in the oval or banana-shaped inner vessel.

R-122 - 3 -

The air chambers on both sides contribute significantly to smoothening this process. The result is a casting mold of particularly high quality, which obviously also leads to better results the subsequent investment casting leads.

According to a further feature of the invention, the side wall and the vessel wall are made of metal and are along two linear and opposing areas inextricably linked. This leads to a better one Manageability of the muffle insert both for preparation for creating the shape as well as during the investment casting itself.

Thanks to this invention, the disadvantages mentioned at the outset are eliminated and the use of investment material as well the energy requirement due to shorter heating times is reduced. The result is a particularly high-strength one Casting mold.

R-122

-A-

Further advantages, features and details of the invention emerge from the following description in a preferred manner Embodiments and based on the drawing; this shows in

Fig. 1: the top view of a so-called muffle furnace with a furnace;

FIG. 2: a representation corresponding to FIG. 1 of another exemplary embodiment of the firing vessel; FIG.

FIG. 3: the enlarged cross section through the firing vessel of FIG. 1 along the line III-III;

4: the enlarged cross section through the firing vessel of Fig. 1 - corresponding to the line IV-IV.

In a cylindrical recess 1 with an example diameter d of 90 mm of a muffle furnace 2 is a furnace or muffle insert 3 arranged with a cylindrical side wall 4. In the latter, according to FIG. 1, there is an inner vessel 5 set with a wall 7 of oval cross-section.

The embodiment of FIG. 2 shows an inner vessel 6 with a banana-like or bean-like cross section; the In Fig. 2, the lower wall part 8 is curved towards the upper - partially circular - wall part 9, the one marked with S designated diameter forms an axis of symmetry.

Between the outer side wall 4 and the vessel wall 7 there are two chambers 10, which in the example of FIG In the case of the lower chamber 10 of FIG. 2, a bulge is added to this shape.

• * I I I

R-122 - 5 -

The interior 11 of the inner vessel 5, 6 takes an investment material 12 for a wax model 13 of a denture part.
on.

This wax model 13 is the replica | of a metal frame or the like after its production with | covered with a veneer for the production of dentures | will. This wax model 13 is attached to a wax base 14 f, which in FIG. 3 is similar to a 5-armed candlestick. I According to the so-called lost wax technique, the embedded einge- ι wax pattern is melted out 13 with its wax base 14, and there is thus the mold - reference numeral \

20 in Fig. 4 - for that metal frame and the pouring channel I.

21 with inlet funnel 22 within the investment material 12. \

The investment material 12 is electrically or |

heated in another form. Since the distance a of the vessel wall |

7 of the wax model 13 in the main axis of the oval about the \

equals the corresponding distance q across it, there is a ί all around

even temperature distribution achieved. At the same time \

fill the chambers 10 with hot air, whereby a closed |

additional warming effect and a very fast penetration \

penetration of the investment material 12 is achieved. ;

Claims (3)

1. Muffle insert for dental technology for the production of Denture parts or tooth frameworks on the way of the investment casting into a hollow shape, which can be melted out by a For example, a model made of wax in one of a cylindrical side wall of the muffle insert surrounding investment material is determined, characterized, that the side wall (4) surrounds a wall (7) approximately oval cross-section of an inner vessel (5) and between Side wall and vessel wall approximately crescent-shaped chambers (10) are provided in cross-section. 2. Muffle insert for dental technology for the manufacture of denture parts or tooth frameworks by means of investment casting into a hollow mold, which is formed by a model that can be melted out, for example made of wax, in a is determined by a cylindrical side wall of the muffle insert surrounded by investment, characterized in that, that the side wall (4) of a wall (8, 9) has an approximately banana-shaped cross section of an inner vessel (6) surrounds and between the side wall and the vessel wall an approximately half-moon shaped chamber (10) and a crescent-shaped chamber (10) with an outlet 3. recess towards the casting center are provided. - A 2 - • · · I R-122 - A 2 - 3. muffle insert according to claim 1 or 2, characterized in that that the side wall (4) and the vessel wall (7; 8, 9) are made of metal and are linear along two I as well as opposing areas with each other I are inextricably linked.