Dental cooling method and dental cooling device

Patent metadata

Field	Value
Publication number	US-11378336-B2
Application number	US-201916696314-A
Country	US
Kind code	B2
Filing date	Nov 26, 2019
Priority date	Dec 17, 2018
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

A dental cooling device is provided, comprising a muffle ( 12 ) and a medium ( 30 ) as cooling source. The medium ( 30 ), in particular a liquid medium ( 30 ), is stored at least in the outer region of the muffle ( 12 ) and has an evaporation temperature higher than the room temperature. The quantity of medium ( 30 ) is calculated in advance such that the enthalpy of evaporation of the medium is substantially destroyed or consumed when cooling the muffle ( 12 ) to the evaporation temperature.

First claim

The invention claimed is:

1. A dental cooling method for cooling a muffle ( 12 ) comprising
cooling the muffle with a cooling source ( 12 ) to a divesting temperature of less than 80° C.,
wherein the cooling source is a medium ( 30 ) having a melting or evaporation temperature higher than room temperature,
wherein the medium ( 30 ) is fed to the muffle ( 12 ),
wherein the cooling is effected by latent heat accumulators,
wherein a quantity of the medium ( 30 ) is at least sufficient such that the muffle ( 12 ) is cooled to at least one phase transition temperature of the medium ( 30 ), and wherein the medium ( 30 ) is accommodated in a high-temperature-resistant, fibrous mass comprising a high-temperature thermal insulation fiber brought into contact with the muffle ( 12 ) for cooling the muffle.

2. The method according to claim 1
wherein the divesting temperature is less than 50° C.,
wherein the medium ( 30 ) comprises a solid or liquid medium ( 30 ),
wherein feeding the medium to the muffle comprises bringing the medium into direct or indirect contact with the muffle,
wherein the quantity of the medium ( 30 ) is calculated in advance.

3. The method according to claim 1 ,
wherein during cooling to the at least one phase transition temperature, the thermal energy of the muffle is converted substantially into the enthalpy of vaporization and/or enthalpy of fusion of the medium ( 30 ), and is consumed.

4. The method according to claim 1 ,
wherein the cooling of the muffle ( 12 ) by means of the cooling source is performed to a temperature below the phase transition temperature.

5. The method according to claim 1 ,
wherein the muffle ( 12 ) is cooled by contacting from a temperature above a phase transition temperature to a temperature below the phase transition temperature.

6. The method according to claim 1 ,
wherein the medium ( 30 ) is predominantly supplied to a lateral surface of the muffle ( 12 ) or is brought into direct or indirect contact with the lateral surface of the muffle.

7. The method according to claim 1 ,
wherein the muffle ( 12 ) is at least partially surrounded by a sleeve ( 14 ) providing the medium ( 30 ) for cooling the outside of the muffle.

8. The method according to claim 7 ,
wherein the muffle ( 12 ) is completely surrounded and circumferentially surrounded by the sleeve ( 14 ).

9. The method according to claim 1 ,
wherein the high-temperature thermal insulation fiber that is brought into contact with the muffle ( 12 ) for cooling the muffle is performed by mutually rolling at selective locations of the muffle ( 12 ).

10. The method according to claim 9 ,
wherein the high-temperature-resistant fibrous mass is brought into contact with the muffle ( 12 ) for cooling thereof by mutually rolling at all locations of the circumference of the muffle ( 12 ).

11. The method according to claim 1 ,
wherein the medium ( 30 ), evenly distributed around the periphery of the muffle ( 12 ), is supplied to the muffle at the start of the cooling method by spraying or immersion in a suitable container or both by spraying and immersion.

12. The method according to claim 1 ,
wherein the medium ( 30 ) is completely liquefied or evaporated in and at the muffle ( 12 ) at the end of the cooling method.

13. The method according to claim 1 ,
wherein a moisture sensor or a plurality of moisture sensors detect the moisture content of the medium ( 30 ) or the muffle ( 12 ) or the temperature of the muffle ( 12 ) at the end of the cooling process, and
wherein a control device initiates divesting of a dental restoration part from the muffle ( 12 ) when the moisture and/or temperature measured falls below a predetermined threshold value.

14. The method according to claim 1 ,
wherein a pot-shaped container is provided for receiving the medium ( 30 ), an inner diameter of which pot-shaped container exceeds an outer diameter of the muffle ( 12 ) by a small amount, and
wherein an annular gap resulting between the muffle ( 12 ) and the container is calculated with respect to a volume such that the volume corresponds to a quantity of the medium ( 30 ) of which an enthalpy of vaporization is to be consumed.

15. The method according to claim 1 ,
wherein, when calculating an enthalpy of fusion and/or enthalpy of evaporation, addition or deduction for the mass of the cooling medium to be provided is included, depending on whether the divesting temperature is below the melting temperature or evaporation temperature (addition) or above (deduction).

16. The method according to claim 1 ,
wherein, at the start of the cooling method, the temperature of the muffle ( 12 ) is detected, and
wherein cooling is enabled by the cooling medium as soon as the temperature of the muffle ( 12 ), which is freely cooling down, falls below a predetermined threshold value.

17. The method according to claim 1 ,
wherein after completion of the cooling method, a dental restoration part in the muffle ( 12 ) is divested.

18. The method according to claim 1 ,
wherein after complete liquefaction or evaporation of the cooling medium, a dental restoration part in the muffle ( 12 ) is divested by sand blasting.

19. A dental cooling device comprising
a muffle ( 12 ) and
a medium ( 30 ) as cooling source,
wherein the medium ( 30 ) is stored at least in an outer circumferential region of the muffle ( 12 ) and has an evaporation temperature exceeding room temperature,
wherein the quantity of the medium ( 30 ) is calculated in advance such that the thermal energy of the muffle is substantially converted into enthalpy of vaporization and/or enthalpy of fusion of the medium ( 30 ) as a result of cooling the muffle ( 12 ), and the thermal energy is consumed, and
wherein the medium ( 30 ) is accommodated in a high-temperature-resistant, fibrous mass comprising a high-temperature thermal insulation fiber brought into contact with the muffle ( 12 ) for cooling the muffle.

20. The dental cooling device according to claim 19 ,
wherein the medium comprises a liquid medium ( 30 ).

21. The cooling device according to claim 19 , comprising one or more of the following:
wherein the muffle ( 12 ) is cylindrical,
wherein the cooling medium is located on a lateral surface and in an upper or outer region of the muffle ( 12 ), and
wherein a sleeve ( 14 ) impregnated or filled with the medium ( 30 ) surrounds the muffle ( 12 ).

Assignees

• Ivoclar Vivadent Ag

Inventors

• Jussel Rudolf
• Tubic Aleksandar

Classifications

• F27B2005/064

  disposed in the furnace, around the chamber, e.g. coils · CPC title

• A61C13/0007

  using sand blasting · CPC title

• F27B17/025

  for dental workpieces · CPC title

• F27B5/10 Primary

  Muffles · CPC title

• A61C13/20 Primary

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