Dental firing or press furnace

Patent metadata

Field	Value
Publication number	US-9759487-B2
Application number	US-201414260445-A
Country	US
Kind code	B2
Filing date	Apr 24, 2014
Priority date	Mar 2, 2011
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

The invention relates to a dental firing or press furnace ( 10 ) that enables the production of at least one dental restoration part ( 62 ). The dental firing or press furnace is provided with a firing space ( 12 ) that is heatable with the aid of a heating device ( 22 ), preferably, a resistance heating device. A heat-conducting element ( 50 ) having a specific thermal conductivity of at least 100 W/mK is arranged on the floor of the firing space ( 12 ).

First claim

The invention claimed is:

1. A dental firing or press furnace for the production of at least one dental restoration part, comprising
a heating device,
a firing space that is heatable with the aid of the heating device,
a heat-conducting element having a specific thermal conductivity of at least 100 W/mK that is arranged on a floor of the firing space,
wherein the floor of the firing space comprises a positive locking element onto which the heat conducting element is accommodated,
wherein the heat-conducting element extends along the floor of the firing space while covering or nearly covering the floor of the firing space.

2. The furnace as claimed in claim 1 , wherein the positive locking element can be arranged such that the positive locking element protrudes from the floor of the firing space into a mating recess within the heat conducting element.

3. The furnace as claimed in claim 1 , wherein the positive locking element protrudes from the heat conducting element into a mating recess within the floor of the firing space.

4. The furnace as claimed in claim 1 , wherein the positive locking element comprises at least one pin and/or embossment.

5. The furnace as claimed in claim 1 , wherein the positive locking element comprises at least one cone.

6. The furnace as claimed in claim 1 , wherein the positive locking element comprises at least a combination of a tongue and groove.

7. The furnace as claimed in claim 1 , wherein the heating device comprises a resistance heating device.

8. The furnace as claimed in claim 1 , wherein the heat-conducting element forms a footprint on its upper side, and acts as a carrier to support at least a restoration part, a firing tray with at least one restoration part, or a press muffle.

9. The furnace as claimed in claim 3 , wherein the heat-conducting element is substantially formed in a disk-shaped manner and radially extends past the restoration part or the press muffle.

10. The furnace as claimed in claim 9 , wherein the disk-shaped manner of the heat-conducting element comprises a circular disk-shaped manner.

11. The furnace as claimed in claim 10 , wherein the heat-conducting element is spaced apart from the side wall of the firing space thereby forming a gap whose width is less than one third of its diameter.

12. The furnace as claimed in claim 11 , wherein the gap is one fourth to one twentieth of its diameter.

13. The furnace as claimed in claim 12 , wherein the heat-conducting element is centrally located on the floor of the firing space and comprises an edge or rim, wherein between the edge or rim and a circumferential side wall of the firing space a gap exists as an annular gap whose width remains constant throughout its run.

14. The furnace as claimed in claim 13 , wherein the heat-conducting element comprises a height of one twentieth to one third of its diameter.

15. The furnace as claimed in claim 14 , wherein the heat-conducting element comprises a height of approximately one tenth of its diameter.

16. The furnace as claimed in claim 15 , wherein the heat-conducting element comprises silicon carbide (SiC), aluminum nitride (AlN) or molybdenum.

17. The furnace as claimed in claim 16 , wherein the floor of the firing space comprises a thermal insulation material.

18. The furnace as claimed in claim 17 , wherein the thermal insulation material comprises fireclay.

19. The furnace as claimed in claim 18 , wherein the floor comprises a central recess, in which the heat-conducting element is accommodated in a partially ground-recessed manner.

20. The furnace as claimed in claim 19 , wherein the heating device is arranged in a region of the side wall of the firing space and wherein the floor of the firing space is free from the heating device.

21. The furnace as claimed in claim 20 , wherein the heat-conducting element is shaped as an alveolar or honeycombed carrier.

22. The furnace as claimed in claim 21 , wherein the honeycombs of the alveolar or honeycombed carrier are shaped according to the type of a square pipe that extends vertically, and that the heat-conducting element is formed into lattice shape in the plan or top view.

23. A dental firing or press furnace for the production of at least one dental restoration part comprising
a heating device,
a firing space that is heatable with the aid of the heating device,
a heat-conducting element having a specific thermal conductivity of at least 100 W/mK that is arranged on a floor of the firing space,
wherein the floor of the firing space comprises one part of a centering means and the heat conducting element comprises a mating counter-part of said centering means by means of which the heat conducting element is automatically centered with respect to the floor of the firing space,
wherein the heat-conducting element extends along the floor of the firing space while covering or nearly covering the floor of the firing space.

24. The dental firing or press furnace according to claim 23 , wherein the one part of the centering means exerts magnetic force with respect to the counter-part of said centering means.

Assignees

• Ivoclar Vivadent Ag

Inventors

• Jussel Rudolf

Classifications

• F27B17/025

  for dental workpieces · CPC title

• F27B5/10 Primary

  Muffles · CPC title

• A61C13/20

  Methods or devices for soldering, casting, moulding or melting {(A61C13/04, A61C13/081 take precedence)} · CPC title