Dental furnace

Patent metadata

Field	Value
Publication number	US-2017030649-A1
Application number	US-201615293673-A
Country	US
Kind code	A1
Filing date	Oct 14, 2016
Priority date	Apr 30, 2010
Publication date	Feb 2, 2017
Grant date	—

Abstract

In a dental furnace having a firing chamber ( 12 ) with a base and at least one receiving portion for dental restoration parts ( 40 ). The receiving portion has a plurality of support elements ( 26 ) that are arranged adjacent to one another and in particular have the same thickness, wherein said support elements ( 26 ) support the dental restoration part ( 40 ) during the firing process.

First claim

1 . A dental furnace comprising
a firing chamber comprising
side walls, a top wall and a stationary base having at least one recessed receiving section for dental restoration parts, the recessed receiving section having an open top,
wherein the at least one receiving section comprises a plurality of support elements,
wherein at least some of said plurality of support elements form a common support plane for the dental restoration part,
wherein each support element comprises a substantially plane surface,
wherein the support elements are temperature-resistant at a temperature above 1600° C.

2 . The dental furnace as claimed in claim 1 , wherein at least a part of the surface of the support elements is provided with a structure for creating a multi-point, multi-line or multi-area support plane.

3 . The dental furnace as claimed in claim 1 , wherein said plurality of support elements in the top view have the same geometric shape, and mate with each other or fit together.

4 . The dental furnace as claimed in claim 1 , wherein each support element has a width, a length or both the width and length that amounts to more than twice its height.

5 . The dental furnace as claimed in claim 1 , wherein said plurality of support elements are arranged in close packing on the base of the firing chamber of the dental furnace, leaving slots and/or gaps.

6 . The dental furnace as claimed in claim 1 , wherein said plurality of support elements adjacent to one another at least partially abut against each other, and wherein outer support elements are arranged with a clearance or margin to the walls of the firing chamber of the dental furnace, said clearance or margin at least corresponding to the difference between the added up expansion path of said plurality of support elements upon heating from room temperature to a maximum of 1800° C., and the expansion path or movement of the base of the firing chamber upon heating from room temperature to a maximum of 1800° C.

7 . The dental furnace as claimed in claim 1 , wherein said plurality of support elements are formed in a disc-like manner and are at least partially formed of one of Al 2 O 3 , SiNi, Mullite, Cordierite, AlN, AlTi, SiC, SiO 2 , MgO and porcelain.

8 . The dental furnace as claimed in claim 1 , wherein said plurality of support elements are arranged in a multiple arrangement consisting of at least two support elements on the base of the dental furnace.

9 . The dental furnace as claimed in claim 1 , wherein at least one support element comprises a round shape or an outer shape that deviates from the circular shape.

10 . The dental furnace as claimed in claim 1 , wherein the plurality of support elements are interlocking.

11 . The dental furnace as claimed in claim 1 , wherein the at least one receiving section at least comprises two layers of adjacent support elements, said layers being arranged one above the other.

12 . The dental furnace as claimed in claim 1 , wherein said plurality of support elements are differing in height, but at least end on the same plane with respect to a top layer thereof, in case several layers are arranged on top of each other.

13 . The dental furnace as claimed in claim 1 , wherein between the base of the dental furnace and the at least one receiving section at least one one-piece disc having a high thermal conductivity is arranged, said disc comprising SiC.

14 . The dental furnace as claimed in claim 1 , wherein said plurality of support elements have the same thickness.

15 . The dental furnace as claimed in claim 4 , wherein each support element has a width, a length, or both a width and length that amounts to up to approximately five times its height.

16 . The dental furnace as claimed in claim 5 , wherein said plurality of support elements are arranged in close packing on the base leaving a margin or edge distance to the walls of the firing chamber.

17 . A support element for a dental furnace, characterized by the characterizing features of claim 1 .

18 . The dental furnace of claim 1 , wherein the support elements conduct heat well.

19 . The dental furnace of claim 1 , wherein the firing chamber ensures a uniform temperature when the furnace is closed.

20 . The dental furnace as claimed in claim 11 , wherein the two layers are offset relative to each other such that gaps of one layer are covered.

21 . The dental furnace as claimed in claim 1 , wherein said plurality of support elements are round, triangle-shaped, hexagonal-shaped, square-shaped, non-square rectangular shaped or cross-shaped.

22 . The dental furnace as claimed in claim 1 , wherein said plurality of support elements are arranged next to one another in a positive-locking manner.

23 . The dental furnace as claimed in claim 1 , wherein said plurality of support elements comprise a substantially planar surface.

24 . A dental furnace comprising
a firing chamber, wherein the firing chamber comprises
side walls, a top wall and a stationary base having at least one receiving section for dental restoration parts,
wherein the at least one receiving section comprises a plurality of support elements,
wherein at least some of said support elements form a common support plane for the dental restoration part,
wherein each support element comprises a substantially plane surface, and
wherein a width, a length, or both the width and length of each support element is greater than a height thereof,
wherein the support elements are temperature-resistant at a temperature above 1600° C.

25 . The dental furnace as claimed in claim 24 , wherein at least a part of the surface of the support elements is provided with a structure for creating a multi-point, multi-line or multi-area support plane.

26 . The dental furnace as claimed in claim 24 , wherein said plurality of support elements in the top view have the same geometric shape, and mate with each other or fit together.

27 . The dental furnace as claimed in claim 24 , wherein the width, length, or both the width and length amounts to more than twice the height.

28 . The dental furnace as claimed in claim 24 , wherein said plurality of support elements are arranged in close packing on the base of the firing chamber of the dental furnace, leaving slots and/or gaps.

29 . The dental furnace as claimed in claim 24 , wherein said plurality of support elements adjacent to one another at least partially abut against each other, and wherein outer said plurality of support elements are arranged with a clearance or margin to the walls of the firing chamber of the dental furnace, said clearance or margin at least corresponding to the difference between the added up expansion path of said plurality of support elements upon heating from room temperature to a maximum of 1800° C., and the expansion path or movement of the base of the firing chamber upon heating from room temperature to a maximum of 1800° C.

30 . The dental furnace as claimed in claim 24 , wherein said plurality of support elements are formed in a disc-like manner and are at least partially formed of one or more of Al 2 O 3 , SiNi, Mullite, Cordierite, AlN, AlTi, SiC, SiO 2 , MgO and porcelain.

31 . The dental furnace as claimed in claim 24 , wherein said plurality of support elements are arranged in a multiple arrangement consi

Assignees

• Ivoclar Vivadent Ag

Inventors

• Rohner Gottfried
• Jussel Rudolf

Classifications

• F27D5/0043 Primary

  Supports specially adapted for dental prosthesis · CPC title

• A61C13/20

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

• F27B17/025

  for dental workpieces · CPC title