Heating element for dental ceramic furnace and dental sintering furnace
A heating element, dental technology, applied in the direction of furnace heating element, heating element, heating element shape, etc., can solve the problems of limited application field, change of induction performance, limitation of use of dental induction furnace, etc.
Pending Publication Date: 2021-06-25
VITA ZAHNFABRIK H RAUTER GMBH & CO KG
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Problems solved by technology
However, when performing induction sintering, the size of the firing chamber is largely limited
In addition, care must be taken not to damage the firing chamber when loading the firing chamber, as damage to the furnace chamber walls can lead to changes in induction performance
In addition, the possible uses of dental induction furnaces are largely limited because the properties of the material to be processed and the inductor / base must be precisely matched to each other to obtain proper thermal performance
Due to the dependence on the material parameters in the case of induction-operated dental furnaces, the field of application is largely limited
Method used
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[0031] The dental furnace comprises a housing 10 which, in the embodiment shown, has a substantially cylindrical cross-section and delimits a firing chamber 12 inside it. Inside the housing 10 is provided a high temperature insulator 14 . The dental element to be fired or sintered arranged on the upper surface 18 of the firing table 16 can be fed into the firing chamber 12 by means of the firing table 16 . Furthermore, the firing chamber 12 is closed on its upper side by a cover, not shown. For example, a vacuum connection for generating a vacuum in the firing chamber can be connected via the cover.
[0032] In the exemplary embodiment shown, two heating elements are arranged in the firing chamber 12, wherein the figure 1 In , the heating element is shown before installation. The two heating elements 20 are each inserted into the firing chamber through a through-opening 22 provided in the housing 10 . In order to fix the heating element 20 in the firing chamber, on the one...
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Abstract
The invention relates to a heating element for a dental furnace having a tube element (30) for receiving a heating coil (34) inside the tube element (30). At least one closure element (28 / 40) is connected to at least one open end of the tube element, electrical connectors (36 / 38) being passed through the closure element (40) and fused with the element (28). According to the invention, the tube element, which is made of ceramic material, in particular oxide ceramics, having a plurality of intermediate / transition glasses and glass solder to compensate for the different thermal expansion coefficients, is connected to the connection part (28, 40) such that, by thermal action up to 500 DEG C, no escape of gas from the tube element (30) can occur and thus the operational reliability of the heating element is ensured. The invention further relates to a dental surface having such a heating element.
Description
technical field [0001] The invention relates to a heating element for a dental ceramic furnace and to a dental firing furnace comprising a heating element according to the invention. Background technique [0002] For sintering metal-free dentures (eg zirconia) and especially for firing dental ceramic compounds from zirconium and / or other ceramic materials onto dental alloys, dental furnaces are known which comprise different heating elements. [0003] As furnaces for sintering veneered ceramics and firing for fixing decorative varnishes or for glossing, electric resistance heaters are known, in which heating wires (preferably of the Kanthal type) in quartz glass cells are used as heating elements. However, the materials allow these heating elements to be used at a maximum of 1200°C, which is sufficient to sinter the veneer ceramics and fire them to set the varnish. [0004] Over the years, SiO has been increasingly used 2 Dental restorations are performed. Typically, this...
Claims
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IPC IPC(8): F27D99/00F27B17/02A61C13/20H05B3/44H05B3/62
CPCF27B17/025F27D99/0006F27D2099/0008F27D2099/0011H05B3/44H05B3/62A61C13/20F27D11/02H05B3/08H05B3/12
Inventor 托马斯·巴霍尔泽
Owner VITA ZAHNFABRIK H RAUTER GMBH & CO KG