Dental furnace

Patent metadata

Field	Value
Publication number	US-9726431-B2
Application number	US-201514880335-A
Country	US
Kind code	B2
Filing date	Oct 12, 2015
Priority date	Jul 25, 2011
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

The invention relates to a dental furnace ( 10 ) for dental restorations comprising a firing chamber into which, in particular between a furnace bottom part ( 14 ) and a furnace upper part ( 12 ), the dental restoration, in particular within a muffle, can be introduced, and a sensor that is connected with a control device ( 52 ) for the dental furnace ( 10 ), characterized in that the sensor, in particular the temperature sensor ( 22 ), is arranged outside the firing chamber and comprises a detection range ( 40 ) that also extends outside the firing chamber.

First claim

What is claimed is:

1. A dental furnace for dental restorations comprising
a furnace bottom part,
a furnace upper part,
a firing chamber into which the dental restorations can be introduced,
a sensor that is remotely or locally connected to a control device for the dental furnace,
the sensor detecting and recognizing an approaching object and a user of the dental furnace,
wherein the sensor is arranged outside the firing chamber and comprises a detection range that also extends outside the firing chamber,
wherein the said sensor is formed as a proximity and/or a temperature sensor, and
wherein the sensor is configured to respond to an elevated temperature compared to room temperature.

2. The dental furnace according to claim 1 ,
wherein the dental furnace is formed as a muffle press furnace for dental restoration parts,
wherein the firing chamber is adapted for the accommodation of a muffle and
wherein an object that is to be detected in the detection range comprises the muffle of the muffle press furnace.

3. The dental furnace according to claim 1 ,
wherein the control device performs a special control function if the muffle or the dental restoration reaches the detection range of the sensor.

4. The dental furnace according to claim 3 ,
wherein the control function includes a function that is associated with a start of a firing process of the dental furnace.

5. The dental furnace according to claim 4 ,
wherein the start of the firing process comprises switching on of the dental furnace.

6. The dental furnace according to claim 5 ,
wherein the switching on of the dental furnace comprises opening of the dental furnace.

7. The dental furnace according to claim 1 ,
wherein the detection range of the temperature sensor enlarges in a direction transverse to the temperature sensor if starting from the temperature sensor, and that the detection range extends obliquely to a lateral surface of the dental furnace.

8. The dental furnace according to claim 1 ,
wherein the detection range of the temperature sensor extends along the furnace upper part.

9. The dental furnace according to claim 1 ,
wherein the detection range of the temperature sensor substantially extends horizontally or obliquely upwards or obliquely downwards and covers an area to the side of the furnace upper part.

10. The dental furnace according to claim 1 ,
wherein the temperature sensor is attached to the furnace bottom part and wherein the detection range of the sensor extends upwards about the optical axis of the sensor.

11. The dental furnace according claim 1 ,
wherein the detection range of the temperature sensor, starting from the furnace bottom part, extends upwards or obliquely upwards along the furnace upper part.

12. The dental furnace according to claim 1 ,
wherein the temperature sensor has an optical axis facing towards the furnace and
wherein the optical axis of the temperature sensor hits a reflector that is formed in a manner for reflecting the heat radiation that impinges on the temperature sensor.

13. The dental furnace according to claim 1 ,
wherein the optical axis of the temperature sensor intersects the vertical axis of the firing chamber in the furnace upper part or extends at an angle that deviates at most 15° C. from a straight line that connects the vertical axis with the temperature sensor.

14. The dental furnace according to claim 1 ,
wherein the temperature sensor comprises a spectral sensitivity with a focus in the infrared wavelength range, and responds to objects that are located within the detection range and have an elevated temperature.

15. The dental furnace according to claim 14 ,
wherein the elevated temperature is a higher temperature than room temperature.

16. The dental furnace according to claim 15 ,
wherein the elevated temperature is more than 100 C.

17. The dental furnace according to claim 14 ,
wherein the elevated temperature is more than 300 C.

18. The dental furnace according to claim 1 ,
wherein the temperature sensor is a thermal imaging camera that detects image information of objects located within the detection range as far as they exhibit an elevated temperature.

19. The dental furnace according to claim 1 ,
wherein the control device opens the dental furnace when the temperature sensor detects the presence of an object having an elevated temperature in the detection range.

20. The dental furnace according to claim 1 ,
wherein the temperature sensor comprises a detection range which is subdivided into two subdetection ranges, and
wherein the control device opens the dental furnace when the temperature sensor first detects an object in the first subdetection range that is more distant from the furnace, and subsequently detects the object in a detection range that is closer to the furnace.

21. The dental furnace according to claim 1 ,
wherein the temperature sensor detects a certain approach of an object to the furnace.

22. The dental furnace according claim 1 ,
wherein the temperature sensor is embodied as a one- or two-dimensional field of infrared-sensitive diodes and
wherein the temperature sensor is arranged at least ten centimeters away from the firing chamber.

23. The dental furnace according to claim 1 ,
wherein said sensor is arranged and adapted to detect firing carriers for dental restoration parts.

24. The dental furnace according to claim 1 ,
wherein said sensor is arranged and adapted to detect auxiliary filing parts such as susceptors.

25. The dental furnace according to claim 1 ,
wherein said sensor is arranged remote from the dental furnace and is connected by a remote connection like WIFI, LAN or Bluetooth, and
wherein said sensor is arranged to detect an object which is remote from that dental furnace.

26. The dental furnace according to claim 1 ,
wherein said sensor is arranged to detect the direction of motion and that control device provides a control function dependent on the direction of motion.

27. The dental furnace according to claim 1 ,
wherein said sensor is arranged to detect the status of a debinding oven which is located close to or remote from said dental furnace,
wherein said control device is adapted to control the status of the dental furnace based on an output signal received from said sensor, and
wherein said dental furnace preferably is a sintering furnace.

Assignees

• Ivoclar Vivadent Ag

Inventors

• Jussel Rudolf
• Bürke Harald

Classifications

• F27B5/18

  Arrangement of controlling, monitoring, alarm or like devices · CPC title

• F27D21/0014

  Devices for monitoring temperature · CPC title

• F27D21/04

  Arrangement of indicators or alarms · CPC title

• F27B17/025 Primary

  for dental workpieces · CPC title

• F27D2019/0003

  Monitoring the temperature or a characteristic of the charge and using it as a controlling value · CPC title