JP2880496B1 - Dental molten wax extrusion equipment - Google Patents

Abstract

The present invention provides a wax extruder useful in the injection and filling of relatively large amounts of wax in the field of dental prostheses and orthodontics. SOLUTION: This is a dental wax extruder comprising a grip-type apparatus main body and a temperature control means, wherein the apparatus main body comprises:
A heating block having a through-hole that is provided inside the main body to melt the wax rod and extrude the tip of the apparatus main body; an electric heater and a temperature sensor attached to the block to control heating; A feed mechanism for pushing in a wax rod from the rear, and a temperature control unit compares a block temperature detection signal from the temperature sensor with a preset set temperature signal, and controls a supply current to the electric heater by the comparison signal. A wax extruder for dental use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wax extruder used in the field of dental prostheses and orthodontics for temporarily attaching artificial teeth with wax or forming a casting mold.

[0002]

2. Description of the Related Art In the field of dentistry, when artificial teeth are temporarily attached to a plaster model or an occlusal embankment, waxes are widely used because of their low softening temperature and good moldability and easy handling. In the past, a trowel called a wax spatula has been used. A wax spatula is applied to a pre-heated solid wax to soften or melt a part of it, scoop it up little by little, and frequently transfer it to the required gypsum model or bite ridge, and serve it or, It is routine in the art to press a heated spatula against the surface and level with the heat to prepare the wax mass into the desired shape.

[0003] At this time, the wax spatula is frequently used by heating it with a gas burner or the like. Recently, a wax spatula which has a built-in heater and whose temperature is controlled by electric heating is known. When heating and melting in a larger amount, a dedicated large-sized wax heating device is used.

[0004] Conventional wax spatula is good for scooping a small amount of wax from a lump of wax to form and form a surface, but when handling a large amount of wax, heating and shaping of the spatula are required. And the conventional wax melting apparatus is convenient for melting a large amount of wax, but for example, a metal or resin crown portion connected in series is used. In order to arrange the gypsum at a desired height on a gypsum dental jaw model or an occlusal embankment, it was unsuitable for an operation in which wax was filled into a gap between an crown part and a gypsum model or an undercut and solidified. For such a work, it is necessary to inject a desired amount of wax into the gap between the crown and the plaster model to completely fill the gap, and in the method using a conventional wax spatula, Impossibility rate.

[0005] The present invention aims to provide a wax extruder useful for pouring and filling a relatively large amount of wax in order to solve such problems in dental wax work.

[0006]

A dental wax extruding apparatus according to the present invention includes a heating block having a through hole through which an apparatus body is melted and extruded from an apparatus body, the apparatus body being internally provided in the body, and a wax being inserted into the through hole from behind. Feeding means for pushing the rod in,
It includes an electric heater and a temperature sensor attached to the block to control heating.

[0007] The apparatus of the present invention includes a wax extrusion nozzle which is screwed into the through hole and protrudes from the apparatus main body, in the heating block.

Further, the apparatus includes a temperature control means,
The temperature control means compares a block temperature detection signal from the temperature sensor with a preset set temperature signal, and controls a current supplied to the electric heater by the comparison signal. The temperature control means includes a temperature setting means for defining a required block set temperature, a comparator for comparing the block temperature signal from the temperature sensor with the block set temperature signal, And a current control circuit for ON-OFF controlling the current supplied to the heater.

This temperature control means preferably further comprises:
A current regulator is provided for controlling the current control circuit by defining the upper limit of the supply current for adjusting the viscosity range of the wax.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of a dental wax extruder according to the present invention will be described below. A heating block provided in a main body of the apparatus has a through hole through which a wax rod is melted and extruded from the main body. In addition, an electric heater and a temperature sensor for attaching to the block and controlling heating are attached to the block.

The block is selected from materials having good thermal conductivity, particularly metals or alloys, because it is heated by an electric heater. In addition, the block needs to have a heat capacity such that the supplied wax rod is melted and the temperature does not drop much. In this regard, blocks of aluminum, its alloys, copper, brass and other alloys are used.

FIG. 1 shows a heating block. The heating block 2 is provided with a through hole 3 through which a solid wax rod 9 is inserted and melted. The wax rod is inserted from the rear end side 31 and is heated and eluted from the front end portion 33 as a molten wax 90 to be extruded as a molten extruded wax 91.

The through hole 3 is tapered so as to slightly increase its diameter toward the rear, and has an inner diameter larger than the outer diameter of the wax rod 9 on the rear end side so that the wax rod 9 can be easily inserted. And at the heating section or the tip side, the diameter is smaller than the outer diameter of the wax rod. The wax rod 9 inserted from the rear is melted in the heating part 32 of the through-hole 3, and the wax rod contacts the inner surface of the through-hole near the heating part, seals the inner surface, and feeds the wax rod into the inner part. Molten wax 9
0 is pressed and extruded from the tip side 33 of the through hole.

A nozzle 4 is attached to a through hole 3 opened in the block end face 21 at the tip 33 of the block. The nozzle 4 is provided with a small through-hole 41, and is screwed from the block end face 21 to the tip side 33 of the through-hole to be fixed. This nozzle 4 prevents the wax melted in the through hole from leaking out spontaneously and, when the wax rod is pushed forward, squeezes the molten wax 90 and discharges it as a molten extruded wax 91 to a desired thickness. It is to make it. The inner diameter of the nozzle discharge hole 41 is selected in consideration of the purpose of the extruder and the characteristics of the wax. For example, the inner diameter of the nozzle can be about 1 to 5 mm.

The electric heater 5 is preferably buried in the heating block 2, preferably near the through-hole 3, especially inside the block in parallel with the through-hole 3. FIG. 1A shows an example in which an electric heater 5 is embedded in a heating hole 24 which is provided in parallel with the above-described through hole 3 and opens rearward in the block. The electric heater 5 in the heating hole 24 heats the block 2 and uses the heat to melt the wax rods 9 sequentially inserted into the through holes 3. As the electric heater 5, a nichrome wire, a ceramic heater in which another electric heating wire 51 is integrated with a ceramic material 52, or the like is conveniently used. The ceramic heater is inserted and fixed in the heating hole 52.

A temperature sensor 6 for measuring a temperature is fixed to the heating block 2. The temperature sensor 6 includes
Preferably, a thermistor is used. In this example, as shown in FIG. 1B, the sensor is mounted on the outer surface of the block 2 at a position close to the through hole 3.

As the wax applicable to the wax extruder of the present invention, dental wax is used. The wax must be prepared and used in a melting temperature range so as to have an appropriate viscosity. . The range of the melting temperature varies depending on the type and use of the wax, but usually, a range of a softening temperature of 50 ° C. or higher and melting to 90 ° C. is used. At room temperature, the mixture is formed into a rod shape, heated in a block, and extruded to a viscosity that exhibits appropriate fluidity by pressurization. Illustratively, certain dental waxes have an available temperature range of 60-67 ° C., and for such waxes, the heating temperature of the block also needs to be adjusted to such a narrow range. is there.

In the present invention, a temperature control means is used for this purpose. The temperature control means compares the block temperature detection signal from the temperature sensor with a preset set temperature signal, and A method of controlling a supply current to the electric heater by a signal is employed.

As shown in FIG. 2, such a temperature control means 7 is a comparison between a temperature setting means for setting a required block temperature and a block temperature signal from the temperature sensor 6 and a block set temperature signal. And a current control circuit for ON-0FF controlling the current supplied to the electric heater by an output signal from the comparator.

More specifically, in this example, a thermistor fixed to the outer surface of the block 2 is used as the temperature sensor 6, and the output voltage from the thermistor connected to the constant voltage power supply is amplified and its output is increased. The temperature detection signal 72 of
It is input to the comparator 74. In this example, a variable resistor R1 connected to a constant voltage power supply is used as the temperature setting means, and the block setting temperature signal 73 is set as a voltage and input to the comparator 74.

Block setting temperature signal 7 by comparator 74
3 is output to the gate of the triac T1 connected in series to the AC power line of the electric heater 51, and the conduction of the triac T1 is controlled by the comparison signal. . If the temperature of the block 2 is lower than the set temperature, a comparison signal between the temperature detection signal 72 from the thermistor and the set signal is set so as to conduct the triac T1, and the block is heated. Conversely, if the block temperature is high, the triac T1 is shut off, the block is allowed to cool, and the electric heater 5
1 is performed.

Further, the temperature control means includes a current limiter 7 for controlling the current control circuit by regulating the upper limit of the current supplied to the electric heater for adjusting the viscosity range of the wax.
Preferably, 0 is provided. In FIG. 2, the current limiter 70 has another triac T2 connected in series to the AC power line of the electric heater 51. The triac T2 is controlled by a phase adjuster composed of a diac D and an RC phase shift circuit. By adjusting the variable resistor R2 in the circuit, the power supplied to the electric heater 51 is finely regulated and regulated, so that the temperature of the block can be easily controlled to a narrow range.

FIG. 3 shows a further embodiment of the present invention. In FIG. 3 (A), the apparatus main body forms a pistol type case 1 inside which is provided at the front of the main body. The heating block 2 having the above structure is fixed with the through hole 3 facing forward, the nozzle 4 fixed to the front portion 11 of the block 2 protrudes from the tip of the case 1, and the case rear portion 12 has A wax rod feeding mechanism 8 for inserting a wax rod 9 into the through hole 3 of the block, and a wax rod 9 in the rear portion 12 of the apparatus main body.
And a wax rod insertion hole 19 that can be inserted into the through hole 3 of the block 2.

A trigger 87 for operating the wax rod feeding mechanism 8 is provided on the grip portion 16 of the pistol type case 1 so as to be pivotally supported by the case 1, and the trigger 87 (852) is provided.
, The wax rod 9 is pushed into the through-hole 3 of the block 2, whereby the melted wax 90 can be pressurized and discharged from the nozzle 4.

In this example, the wax rod feeding mechanism 8 has a ring 81 slidable back and forth through the wax rod 9 behind the block 2 and provided coaxially with the through-hole 3. A claw member 83 having a claw 82 supported by the ring and capable of protruding inside the ring 81; a lower front portion of the claw member 83 and a support pin 851 of the trigger 87;
A movable link 84 connecting the more distal end and a trigger 87
And a trigger 87 urged rearward through a spring 86 fixed to the front side of the shaft support pin.

The wax rod 9 is inserted into the through hole 3 of the block 2 through the ring 81 from the rear.
In order to use the trigger 87, hold the grip 16 and use the trigger 87
When the finger pad 852 is pulled, the pivot pin 85 of the trigger 87 is pulled out.
1 moves forward, and this movement is
4, the claw member 83 is moved forward and upward, whereby the claw 82 of the claw member 83 moves upward to be sandwiched between the inner surface of the ring 81 and the lower side of the wax rod 9. , And in this state, the nail stand member 82 and the ring 81 slide forward together at the same time, so that the wax rod 9 can be fed forward.

When the trigger 87 is released or loosened, the front side portion 85 of the trigger 87 is pulled backward by the force of the spring 86 from the pivot pin 85 of the trigger 87.
Since the hook 3 moves downward and retreats, the engagement of the claw 82 with the wax bar 9 is released, and the ring 81 and the claw holder 83 return to their original positions while the wax bar 9 remains.

The tip of the remaining wax rod 9 is melted in the through hole 3 of the block 2, and then, when the trigger 87 is pulled again, the wax rod 9 is similarly sent forward. Thus, the melted wax 90 can be pressed and ejected from the nozzle 4 and discharged. Thus, by pulling the trigger 87 one after another, the molten wax 91
Can be discharged.

The wax rod feeding mechanism 8 shown here is a method using the ring 81 and the nail stand member 83, but may be a collet chuck or another method. Further, the device does not need to be a pistol type case, and the device may be a cylindrical container having a grip portion at a rear portion.

[0030]

As described above, the dental wax extruder of the present invention comprises:
A heating block having a through-hole through which the wax rod is melted and extruded to the front side of the apparatus main body; an electric heater and a temperature sensor attached to the block to control heating; and a wax rod inserted into the through-hole from behind. Since a feed mechanism for pushing in is included, a relatively large amount of molten wax can be extruded from a rod-shaped wax as a raw material.

Since the heating block includes a wax extrusion nozzle which is screwed into the through hole and protrudes from the apparatus main body, it is possible to supply the molten wax to a desired position even when the space to be filled with the wax is narrow. Comes.

The wax extruder of the present invention is provided with a temperature control means, which compares a block temperature detection signal from a temperature sensor with a preset temperature signal to control a current supplied to the electric heater. Thereby, the current control circuit that controls the supply current to the electric heater ON-OFF,
Since the block temperature is adjusted to the set temperature, the molten wax can be adjusted to a desired viscosity range.

Further, since a current limiter for controlling the current control circuit by specifying the upper limit of the supply current for adjusting the viscosity range of the wax is provided, the block temperature can be reduced to a predetermined set temperature and a narrow temperature range. It is possible to adjust the temperature accurately within the range, and it is easy to appropriately handle dental wax having a narrow temperature range.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a heating block used in a molten wax extruder according to an embodiment of the present invention.

FIG. 2 shows a block diagram for a temperature control device used in a molten wax extruder according to an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a molten wax extruder according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Heating block 3 Through hole 4 Nozzle 5 Electric heater 6 Temperature sensor 7 Temperature control means 8 Feeding mechanism 9 Wax stick 90 Melted wax

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A61C 13/00

Claims (4)

(57) [Claims] 1. A dental molten wax extruder comprising a grip-type apparatus main body and a temperature control means, wherein the apparatus main body is provided inside the main body, melts a wax rod, and is attached to a front side of the apparatus main body. A heating block having a through hole to be extruded, an electric heater and a temperature sensor attached to the block to control heating, and a feed mechanism for pushing a wax rod into the through hole from behind, A molten wax extruder for dental use, wherein a block temperature detection signal from a temperature sensor is compared with a preset set temperature signal, and a current supplied to the electric heater is controlled by the comparison signal. 2. The wax extruder according to claim 1, wherein the heating block includes a wax extrusion nozzle screwed into the through hole and protruding from the apparatus main body. 3. A temperature control means for defining a required block set temperature, a comparator for comparing a block temperature signal from the temperature sensor with the block set temperature signal, and an output from the comparator. 2. The wax extruder according to claim 1, further comprising a current control circuit that controls ON / OFF of a supply current to the electric heater by a signal. 4. The wax extruder according to claim 1, further comprising a current limiter for controlling an electric current by defining an upper limit of a supply current for adjusting a viscosity range of the wax.