Dental furnace

FIELD: medicine.

SUBSTANCE: invention refers to a dental furnace for prosthetic dentures. The furnace comprises a firing chamber, wherein a prosthetic denture can be notably placed, particularly in a muffle between the furnace bottom and top; what is also provided is a temperature sensor connected to a control unit of the dental furnace, arranged outside the firing chamber and having a detection sensor extending outside the firing chamber. The temperature sensor is additionally configured in the form of a proximity sensor; the furnace has particularly at least one auxiliary sensor for detection and identification of an approaching object and/or user of the dental furnace.

EFFECT: providing higher accuracy of the furnace temperature control and simplifying the furnace operation.

16 cl, 2 dwg

The invention relates to a dental furnace for dental prostheses in accordance with the preamble p. 1.

Dental furnace with control devices temperature known for a long time.

Such a device, for example, already presented in DE 1160777, serves to maintain a constant temperature in a muffle furnace. Muffle furnace of this type is used for firing the part of the denture in the muffle, which contains the negative casting mold of the received portion of the dental prosthesis. In the illustrated solution, the heating chamber is under camera the actual firing, and heat capacity of local heating of the combustion chamber control or actuate with smoothly adjustable transformer. Heating capacity manages the so-called regulator with a falling arch, which can be considered as the predecessor of the PID controller.

From the point of view of the need to ensure the short duration of the loop parts of the dental prosthesis and an ergonomically advantageous workflow, the solution described in the aforementioned patent, are quite complex and cumbersome. On the one hand, this is due to the fact that the pre-heating zone is positioned in such a way that a cold muffle should, as a rule, only be heated there before may be subjected to a firing cycle by placing it in a press camera is in.

However, the particular disadvantage is that in this solution the furnace head is based on the fixed rack and remains stationary, while the highly sensitive part of the denture to move. This solution is really very inexpensive, but it does not meet high quality standards, if only not to resort to extremely long processing cycle, during which dental oven completely cools before the completion of the firing cycle.

However, in modern dental furnaces shorter processing cycle is also necessary for the casting or pressing of the bridges of the several links. High quality production part of the prosthesis within a short loop provide mainly press furnace, in which the pressing stamp or plunger supressive attigny material in the channel in the muffle and the portion of the dental prosthesis is made in the negative form during melting compacted product or workpiece, which is also referred to as impression material.

Control of the temperature kilns and press furnaces for dental technology in General remains unchanged for several decades. As an additional example of the use of thermocouples in combination with a temperature controller should mention DE 26 56 316.

In addition, in DE 101 36 584 A1 PR is illustrated a dental furnace, containing the muffle, with special characteristic in this case is the fact that the temperature sensor is almost penetrates into the muffle and must determine its temperature. However, this requires a special form of the muffle, which is not compatible with a commercially available muffles. In addition, when the specific grooves in the muffle need to pay attention to the fact that the cavity for the parts of the prosthesis did not approach too close to the mentioned grooves, as at a corresponding high power press stamp or plunger, the muffle may form cracks due to its softening in this place.

Thus, more precise temperature control can be better implemented by using the solution according to DE 10 2005 015 435 A1, according to which the temperature sensor, usually spatially remote from the muffle, measure its temperature, for example, on type of thermometer. Temperature measurement is carried out in a position that is clearly spatially removed from the surface facing to the heating elements, which provides a measurement of the real temperature of the muffle.

On the other hand, the invention is nevertheless based on the task of creating a dental furnace for dental prostheses in accordance with the preamble p. 1, the furnace is further improved in terms of manufacturability and continue the major loop.

This task is solved by the inventive paragraph 1. Preferred further improvements result from the dependent claims.

According to the invention, particularly preferably, if in addition to the temperature sensor aimed at the part of the denture, or instead, include a temperature sensor located outside the combustion chamber, and determining the temperature of objects approaching the dental furnace. This temperature sensor has a detection range, i.e. the range in which it responds to increased temperature compared to room temperature and signals the presence of an object having a high temperature.

This surprisingly simple measure can be used for opening a dental furnace when approaching a hot object, for example the hottest part of the denture or muffle, already preheated in an oven pre-heating, with this opening allows you to put in the oven part of the dental prosthesis or the muffle.

Dental furnace preferably includes a cap of the furnace, which is heated dental furnace, and the lower part of the furnace, which is stationary. The furnace cover is connected with the lower part of the furnace through the known furnace hinge device.

When approaching the mountains is what object the furnace hood now rises rapidly with the help of the engine, so that the dental technician or dentist depending on the circumstances, may immediately be placed or put an object such as, for example, a pre-heated muffle, on the floor of the combustion chamber.

Even though this device with a movable furnace hood is preferred, it is obvious that instead it is also possible the device without additional options, in which the furnace cover remains stationary, while the floor of the combustion chamber low. You can also provide an automatic door opening of the combustion chamber, through which you can make a retort, when this last-mentioned variants of implementation, however, is clearly worse in terms of ease of manipulation.

According to the invention particularly preferably, if the detection range of the temperature sensor or probe begins at significant distance from the dental furnace. Preferably, the detection range is oriented so that it passes under the tilt in the lateral direction in front of the furnace hood. In the case of fast or smooth movement when approaching hot muffle remains enough time to cover the furnace, opened with a drive motor. The opening may occur during, for example, one second, and the dental technician will need little more than a second to transfer the hot muffle, for example, at 80 cm at an angle to the hood of the oven.

Detection range, undoubtedly, may be quite small both in vertical and in horizontal direction, and accordingly, a dental technician can intentionally move the hot muffle in the above-mentioned range of the detection so as to open a dental oven.

It is clear that instead can be implemented in the detection range in the form of a dihedral angle of 90° or more, and if located adjacent dental furnaces clear that preferably substantially reduce the length of the detection range, e.g. up to 50° in order to not accidentally simultaneous opening of several dental furnaces with hot muffle.

In a particularly preferred variant of the invention the furnace hood has a reflector for thermal radiation, the reflector is located at an oblique angle relative to the optical axis of the temperature sensor.

The reflector can be easily made from a strip of sheet metal, which may have a somewhat curved shape optional dental technician in order to adjust the detection range to his personal needs. It is clear that the reflector is chosen so that it is particularly good at reflecting infrared radiation, i.e. radiation within the wavelength range of about 800 nm.

Instead, t is the train you can easily attach the temperature sensor to the dental kiln in a different position. For example, it can be attached on the outside of the furnace hood and have a detection range, which runs from him in the lateral direction. In addition, the temperature sensor can be attached to the lower part of the furnace and the detection range then runs essentially vertically upwards or obliquely outwards/upwards respectively, when viewed relative to the vertical axis of the dental furnace.

The reflector device mainly has the advantage that the temperature sensor is significantly better protected, especially if from the hot parts arise spray, for example, because they are only on the reflector, which is made of a strip of sheet metal or metal plate.

In addition, this solution provides a multi functional using the temperature sensor. If the temperature sensor is rigidly attached, that is rigidly connected with the lower part of the furnace and directed into the oven, it can serve as a proximity sensor with a closed hood of the furnace, since thermal radiation reflected by the reflector, while the effect on the temperature sensor.

However, if the furnace hood is opened, the detection range of the temperature sensor is directed into the oven, for example, to muffle or part denture, so that its temperature can easily be determined.

Available in sales of the infrared sensor can be used as the temperature sensor, which detects the approach of the hot muffle, i.e. the muffle temperature, for example, more than 500°C. in Addition, you can also use a thermal imaging camera or any other camera operating in the infrared range. In addition, you can use the matrix sensitive to infrared radiation diode, which responds to the temperature of the muffle from approximately 300°C and up to approximately 850°C.

If the selected configuration in which the element temperature measurement detects a temperature in the range of detection by using a reflector attached to the hood of the furnace, it is important that the element temperature measurement was protected from the waste heat of the combustion chamber when the outdoor furnace hood. This can be done either by selecting the appropriate acceptable removal element determining the temperature from the furnace hood, or using a shield, which serves as a heat insulator and contains only a very small opening is made in front of the infrared sensor at some distance from him and angle of the detection range, and which blocks the radiation of the furnace emitted open the hood of the furnace in the direction of the temperature sensor.

According to the invention particularly preferably, the invention for the first time can be implemented contactless action and celenapravlennaia then when the dental furnace should be opened.

In a modified embodiment, the sensor is designed as a proximity sensor, which ensures the opening of the furnace when approaching the muffle. This configuration is particularly preferred if the at least one additional distinctive feature, such as a barcode, the iris of the user or something like that, will provide additional identification and differentiation from random approximation.

In a preferred configuration provides that the control device prior to the opening of the dental furnace on the basis of the output signal of the temperature sensor checks whether the combustion chamber sufficient temperature for placing an object, in particular the muffle.

In an additional preferred embodiment provides that the dental furnace designed as a press muffle furnace for part of the denture that the combustion chamber is adapted to accommodate the muffle, and that the object that should be detected in the detection range, is a muffle muffle press furnace.

In an additional preferred embodiment provides that the control device performs a specific control function, when hit muffle or part denture, the particular on the media in the detection range of the temperature sensor.

In an additional preferred embodiment provides that the control function includes a function, which is associated with the beginning of the operation of firing the dental furnace, for example the inclusion of the dental furnace, but especially with the opening of the dental furnace.

In an additional preferred embodiment, it is provided that the detection range of the sensor temperature increases in the direction transverse to the temperature sensor, when viewed from a temperature sensor, and the detection range lies oblique to the side surface of the dental furnace.

In an additional preferred embodiment, it is provided that the detection range of the temperature sensor runs along the upper part of the furnace, in particular the detection range of the temperature sensor lies essentially horizontally or obliquely upwards or obliquely downwards and covers an area at the side of the upper part of the furnace.

In an additional preferred embodiment, provided that the temperature sensor is attached to the lower part of the furnace and the detection range of the sensor lies about the optical axis of the sensor and is aimed, in particular, upward.

In an additional preferred embodiment of the preamplifiers is treno, the detection range of the temperature sensor from the lower part of the furnace passes upward or obliquely upward along the upper part of the furnace.

In an additional preferred embodiment, provided that the temperature sensor converts its optical axis to the furnace, and that the optical axis of the temperature sensor falls on the reflector, which duly completed to reflect thermal radiation impinging on the sensor temperature.

In an additional preferred embodiment provides that the optical axis of the temperature sensor crosses the vertical axis of the combustion chamber in the upper part of the furnace or lies at an angle which deviates not more than 15° from the straight line connecting the vertical axis with temperature sensor.

In an additional preferred embodiment, provided that the temperature sensor has a spectral sensitivity, the focus of which lies in the infrared wave range, responds to objects in the detection range and having an elevated temperature that is significantly higher temperature compared with room temperature, in particular more than 100°C. and particularly preferably more than 300°C.

In an additional preferred embodiment provides that the sensor is temperature performed according to the type of thermal imaging camera, which detects image information of the object located in the detection range, because they have a high temperature.

In an additional preferred embodiment provides that the control device opens the dental furnace when the sensor detects the temperature of the presence of an object with a high temperature in the range of detection.

In an additional preferred embodiment, provided that the temperature sensor provides detection range, which is divided into two sub-bands of detection, and that the control device opens the dental furnace when the temperature sensor first detects the object in the first sub-range detection, more remote from the furnace, and then detects an object in the detection range, which is closer to the furnace, that is, the temperature sensor detects a certain object approaches the furnace.

In an additional preferred embodiment, provided that the temperature sensor is executed in the form of one - and two-dimensional areas, sensitive to infrared radiation of the diodes, and that the temperature sensor is located at least ten centimeters from the camera firing.

In an additional preferred embodiment, the sensor is located outside the camera Obi is and contains a detection range, which also lies outside the combustion chamber, and the sensor is additionally designed as a proximity sensor and, in particular, at least one additional sensor detects and recognizes an approaching object and/or user of the dental furnace.

Additional advantages, details and characteristics are revealed from the following description of exemplary variant implementation in conjunction with the drawings, in which:

in Fig.1 illustrates a schematic view of the proposed dental furnace in one exemplary embodiment, and

in Fig.2 illustrates a side view of an additional variant of implementation of the dental furnace according to the invention.

Dental furnace 10 illustrated in Fig.1, contains a cap 12 of the furnace as the upper part of the furnace and the lower part 14 of the furnace. It is made as a press muffle furnace, and a circular cap 12 forms in the oven in a known manner the combustion chamber, the diameter of which is sufficient for the placement of similar rounded and essentially cylindrical muffle.

The lower part of the furnace contains the inclined plane 16, touch-enabled display 18 through which the proposed dental furnace 10 can operate.

The cap 12 of the furnace rests in a known manner on the lower part of the furnace 14 through lifting on ortnoe device, so it can be lifted from the lower part of the furnace and, leaving the gap, turning to open. Also in a known manner oven can perform firing by incorporating heating in the furnace hood when closed, the furnace hood and by inserting the pressing stamp or plunger in the muffle, and the muffle is heated, and the pressing stamp or plunger supressive material of the denture in the muffle in the prepared cavity of the mold.

According to the invention provides that the sensor 32, the temperature of the reference attached to the lower part of the furnace, while the sensor is directed to the vertical axis 24 of the dental furnace. The sensor 22 temperature rests directly on the upper side 26 of the lower part 14 of the furnace, i.e. at the lower end of the hood 12 of the furnace.

In addition, to the outer periphery of the cap 14 of the furnace, near the sensor 22, the temperature attached to the reflector 30.

The reflector 30 is made in the form of a strip of sheet metal, for example, aluminum foil, or from some other sheet metal and serves to reflect heat radiation. It runs from the furnace cover at a slight angle, for example at an angle of 45°. It is clear that the exact orientation can be adapted to the requirements within wide limits.

If the reflector angle is 45°, the detection range of 40 runs at an angle of 90° with respect to the optical the axis 42 of the sensor 22 and temperature. It is clear that the detection range 40 conically widens and passes in a known manner. Preferably creates a strong enough focus that makes them particularly sensitive detection of temperature and also at a greater distance. Focusing can also be improved by making the reflector 30 by type of concave mirrors.

In the illustrated exemplary embodiment, the muffle 50 schematically illustrated in the position in which thermal radiation is in the range 40 detection sensor 22 and temperature.

The muffle was preheated in an oven pre-heating to a temperature of 700°C and still has a temperature of approximately 500°C with its outer side. Thermal radiation emitted by the muffle, now affects the sensor 22 temperature in the range of 40 discovery through the reflector 30. The sensor 22 temperature electrically connected with the control device 52, which is preferably installed in the lower part 14 of the furnace. When approaching a hot muffle control device 50 outputs a signal opening for lifting and turning device 20, which, activated by the signal, raises the cap 12 of the furnace and allows virtually one movement to put muffle 50 on the lower part of the furnace under an optical axis 42, that is, to slow the movement of the muffle 50 directed by the Yu to dental furnace is not necessary.

It is clear that the connection between the sensor 22 and temperature control device 52 may be performed in any convenient way. The sensor 22, the temperature actually is rigidly fixed to the base, preferably attached to the dental furnace, but is electrically connected with the control device in any suitable way, for example, by radio, Bluetooth, infrared or a known manner by means of an electric line.

It is clear that the orientation of the detection range can be carried out in any suitable way. If necessary, the cap 12 of the furnace as standard can also be attached, for example, several reflectors 30, as may be provided by several possible mounting positions for the sensor 22 and temperature. Dental technician - even if he, for example, left-handed, you may install the sensor 22, the temperature in any suitable way and may automatically start opening when approaching the muffle 50 to dental furnace 10.

In Fig.2 shows a modified variant of the implementation of the dental furnace. Identical reference position designate identical or corresponding components.

Unlike the implementation shown in Fig.1, the range of 40 detection sensor 22, the temperature is oriented essentially vertically. Optical on the ü 42 of the sensor 22, the temperature lies - starting from the lower part 14 of the furnace is vertically upwards, for example, at an oblique angle in the lateral direction in front of the hood 12 of the furnace.

It is clear that in this case, if necessary, can be implemented several options for mounting sensor 22 temperature, which provide a modification of the detection range by the choice of a dental technician. Also in this case, the sensor 22 temperature is due to the fact that the muffle 50 at least partially falls within the range of 40 detection, and due to the fact that thermal radiation emitted by the muffle 50, raises the cap 12 of the furnace by means of a control device 52 in the lower part of the furnace.

1. Dental furnace for dental prostheses containing the lower part of the furnace and the upper part of the furnace, these dental furnace further comprises a combustion chamber for placement of a dental prosthesis or parts thereof, in particular, in the muffle, and the sensor, which is connected with the control device of the dental furnace, characterized in that the sensor, which is, in particular, the sensor (22) the temperature is outside the combustion chamber and adapted to determine the temperature of objects approaching the dental furnace.

2. Dental furnace under item 1, characterized in that the dental furnace (10) is made in the form of a press muffle furnace for frequent is the first dental prosthesis or parts thereof, the combustion chamber is configured to accommodate the muffle (50), and the object detected in the range of (40) detection, is a muffle muffle press furnace.

3. Dental furnace under item 1 or 2, characterized in that the control device (52) is configured to implement control functions, if the muffle (50) or part of a dental prosthesis, in particular, on the media falls within the range (40) detection sensor (22) temperature.

4. Dental furnace according to p. 3, wherein the control function includes a function related to the beginning of the firing process of the dental furnace, for example the inclusion of the dental furnace, especially with the opening of the dental furnace (10).

5. Dental furnace under item 1, characterized in that range (40) detection sensor (22) temperature extends in a direction transverse to the temperature sensor, when viewed from a temperature sensor, and passes obliquely to the lateral surface of the dental furnace (10).

6. Dental furnace under item 1, characterized in that range (40) detection sensor (22) temperature runs along the upper part (12) of the furnace, in particular, in essence, is held horizontally or obliquely upwards or obliquely downwards and covers an area at the side of the upper part (12) of the furnace.

7. Dental furnace under item 1, characterized in that the sensor (22) the temperature attached to the lower part (14) of the furnace and range (40) sensor detection takes place around the optical axis (42) of the sensor, in particular, upward.

8. Dental furnace under item 1, characterized in that range (40) detection sensor (22) temperature, starting from the bottom (14) of the furnace, passes upward or obliquely upward along the upper part of the furnace (12).

9. Dental furnace under item 1, characterized in that the sensor (22) the temperature of its optical axis (42) facing the furnace, and the optical axis of the temperature sensor falls on the reflector (30), configured to reflect thermal radiation impinging on the sensor (22) temperature.

10. Dental furnace under item 1, characterized in that the optical axis (42) of the sensor (22) the temperature crosses the vertical axis (24) of the combustion chamber in the upper part (12) of the furnace or held under the angle that deviates by no more than 15° from the straight line connecting the vertical axis (24) with a sensor (22) temperature.

11. Dental furnace under item 1, characterized in that the sensor (22) temperature has a spectral sensitivity, the focus of which lies in the infrared wave range, and responds to objects in range (40) detection and with increased temperature, in particular more than 100°C. and particularly preferably more than 300°C.

12. Dental furnace under item 1, characterized in that the sensor (22) temperature made in the form of a thermal imaging camera that detects information is Yu about the image of interest, located in range (40) detection and having a fever.

13. Dental furnace under item 1, characterized in that the control device (52) is made with the possibility of opening a dental furnace when the sensor detects (22) the temperature of the object at high temperature in the range of (40) detection.

14. Dental furnace under item 1, characterized in that the sensor (22) temperature range (40) detection, which is divided into two sub-bands of detection, thus the control device (52) opens a dental furnace (10) when the sensor (22) temperature first detects the object in the first sub-range detection, more remote from the furnace, and then detects an object in range (40) detection, which is closer to the oven.

15. Dental furnace under item 1, characterized in that the sensor (22) temperature made in the form of one - or two-dimensional region sensitive to infrared radiation diode and is at least ten centimeters from the camera firing.

16. Dental furnace for dental prostheses containing the lower part of the furnace and the upper part of the furnace, these dental furnace further comprises a combustion chamber for placement of a dental prosthesis or parts thereof and the sensor connected with the control device stomatol the policy of the furnace, characterized in that the sensor is located outside the combustion chamber and additionally designed as a proximity sensor, and, in particular, at least one mentioned the proximity sensor detects and recognizes an approaching object.