JPH06104328B2 - Visible Light Polymerization Resin Curing Device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a visible-light-curing resin curing apparatus used for curing a visible-light-curing resin that is cured by being irradiated with visible light.

(Prior Art) The use of synthetic resins in recent years extends to all industrial fields, and the method of curing the synthetic resin (resin polymerization method)
For this, various molding methods such as injection molding, extrusion molding, vacuum molding, and suction molding are adopted.

Recently, polymerization under irradiation of ultraviolet rays and visible light,
With the advent of a photopolymerizable resin that cures, a method of obtaining a polymerized cured product by irradiating the photopolymerizable resin with light is becoming widespread. In particular, it is being adopted as a dental member, an embedding member, and the like.

The light source of this light irradiation means includes an ultraviolet lamp, a fluorescent lamp, a halogen lamp, a xenon lamp, and the like.
62-38149 discloses a curing device having a fluorescent lamp that emits visible light of 400 to 500 nm, and, for example, in JP-A-62-47354, it is arranged on a turntable that rotates light from a halogen lamp. A curing device for irradiating an irradiation target is disclosed, and it is excellent in that a dental member using a photopolymerizable resin can be cured in a short time.

(Problems to be Solved by the Invention) However, the conventional curing device for a photopolymerizable resin has the following problems because the illuminance of irradiation light is fixed.

That is, (1) a curing device that uses a fluorescent lamp as a light source of an irradiation light generation device has a large temperature rise of the photopolymerizable resin during light irradiation, but the light intensity is weak and the deep part curability is poor, so When it is used for curing a thick object to be irradiated, the polymerization and curing take time, and the strength and water resistance of the polymer are insufficient.

Further, (2) a curing device using a halogen lamp or a xenon lamp as a light source of an irradiation light generation device has a high light intensity and can polymerize and cure the photopolymerizable resin to a deep portion in a short time, but the polymerization may be rapid. The temperature rises significantly. As a result, cracks due to polymerization strain occur in the polymer, or the dimensional accuracy of the polymer decreases due to local thermal expansion, or the polymer,
For example, sagging may occur in the dental technical product made of photopolymerizable resin (the photopolymerizable resin becomes fluid).

(Means for Solving the Problems) The present invention provides means for solving the problems of the above-mentioned conventional methods, that is, visible light polymerization for producing a thick cured product using a visible light polymerization resin. In a curing device for a mold resin, a visible light generator and a visible light irradiation stage are provided, and the visible light generator is provided with a visible light source and a means for changing the illuminance of visible light with the passage of time of visible light polymerization. It is a curing device for a visible-light-curing resin characterized by the following.

Here, “changing the illuminance (light intensity of irradiation light)” means changing the illuminance stepwise or continuously (steplessly) changing.

Although the irradiation light is visible light in the above, it is preferable to use a halogen lamp or a xenon lamp as a light source of the visible light generator. As a means for changing the illuminance of visible light with time, it is preferable to adopt a method of changing the power supplied to the halogen lamp or the xenon lamp.

Furthermore, as a means for changing the illuminance of visible light, it is also preferable to change the number of lighting of a plurality of halogen lamps or quinocene lamps in multiple stages over time. and again,
Two or more different lamps as light sources, such as fluorescent lamps,
It is also preferable to provide a halogen lamp and a xenon lamp and to switch the types of these lighting lamps with time.

When the apparatus of the present invention is used, for example, weak light can be irradiated at the initial stage of polymerization and then strong light can be irradiated, or light can be irradiated in the reverse order.

Therefore, for example, after filling the light-transmissive molding die with a visible-light-curing resin, it is installed in the curing device of the present invention, and when visible light irradiation is performed, depending on the occurrence of polymerization strain or the like during visible-light polymerization molding. By adjusting the illuminance of visible light by changing
As a whole, it is possible to produce a polymerized molded product with less polymerization strain and the like.

In addition, for example, it is possible to suitably carry out the polymerization of a visible light-curing resin having a shapeability such as a dental technique.

That is, after the visible light-curing resin is formed into a desired shape, the molded product is placed in the curing device of the present invention, and then when light irradiation is performed, the illuminance is relatively weak in the initial stage of visible light irradiation. To irradiate light to cure the surface, and subsequently to increase the illuminance of visible light sufficiently to irradiate visible light. By carrying out such a method, it is possible to polymerize and cure without damaging the initially formed morphology.

The change of the illuminance of visible light may be manually performed by a switch, a dial, or the like, or may be automatically performed by a timer after a predetermined time has elapsed.

Further, a method of automatically controlling according to a change pattern of illuminance that is preset by using a sequencer, a programmable controller, or the like can be applied.

As a method of changing the illuminance, voltage adjustment by a sliderac or the like can be used, and when the light source is, for example, a halogen lamp, the power supplied to the halogen lamp can be continuously changed arbitrarily, which is preferable. is there. It can also be easily achieved by controlling the number of lamps to be turned on.

Further, when lighting two or more different lamps, the type of the lighting lamp can be switched by a switch or a timer. For example, a fluorescent lamp is turned on in the initial stage of light irradiation, and then a halogen lamp or a xenon lamp is turned on.

Examples of the visible light polymerization type resin include a composition in which a small amount of a visible light polymerization initiator is added to a single compound or a mixture of compounds having at least one carbon-carbon unsaturated double bond in the molecule. Furthermore, if necessary, a photosensitizer or 3
A reducing agent such as a primary amine can be used.

Further, it is possible to use a composition filled with an inorganic or organic filler, a composition added with an antioxidant, an antistatic agent, a coloring agent, a thermal polymerization inhibitor, etc. in the composition.

Examples of the compound having at least one carbon-carbon unsaturated double bond in the molecule include methyl (meth) acrylate,
Monofunctional (meth) acrylates such as ethyl (meth) acrylate, propyl (meth) acrylate, cyclohexyl (meth) acrylate, benzyl (meth) acrylate, (meth) acrylic acid, hydroxyethyl (meth) acrylate, and hydroxypropyl (meth) acrylate. ) Acrylic acid derivative, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, bisphenol A di (meth) acrylate, bisphenol A
Polyfunctional (meth) acrylates such as ethylene glycol-modified di (meth) acrylate, bisphenol A propylene glycol-modified di (meth) acrylate, bisphenol A glycerol modified di (meth) acrylate, and trimethylolpropane tri (meth) acrylate can be mentioned. .

Examples of the visible light polymerization initiator include camphorquinone, benzyl, anthraquinone, dicarbonyl derivatives such as α-naphthyl, 2-chlorothioxanthone, 2-methylthioxanthone, thioxanthone derivatives such as 2,4, -dimethylthioxanthone, and the like. Alternatively, examples of the organic filler include glass beads, silica fine powder, titanium oxide fine powder, glass fiber, whiskers, carbon fiber, and various polymer powders.

Typical examples of these compositions and visible light-curable resins include dental composite resins.

(Example) Next, the Example of this invention is described.

Embodiment 1: FIG. 1 is a partially cutaway structural view of the first embodiment according to the present invention, and its electric circuit diagram is as shown in FIG.

In the apparatus of this example, five halogen lamps 1 are provided so as to surround the turntable 2 on which the object to be irradiated is placed from above.

Further, it is provided with a variable lamp output transformer 3 and a voltage switching dial 4 for changing the voltage applied to the halogen lamp. After the power switch 5 is turned on to turn on the halogen lamp 1, the voltage switching dial 4 is switched. As a result, it is possible to change the illuminance of visible light with which the light irradiation object is irradiated.

Further, the main curing device is provided with a cooling fan 6 for suppressing a temperature rise of the light irradiation object during irradiation of visible light.

The turntable 2 has a turntable rotation speed variable dial 7, and by sliding the dial, the rotation speed of the irradiation object is appropriately selected within the range of 3 to 60 rpm during irradiation of visible light. Therefore, it is possible to reduce variations in the illuminance of light.

Next, a method of curing the visible light-curing resin using the curing device of the present invention will be described.

First, using a new metacolor (manufactured by Sun Medical Co., Ltd.) as a visible light-curing resin for producing a hard dental resin, a crown (prosthesis) -shaped object to be irradiated is prepared and mounted on the turntable 2 in the main curing device. I put it.

Then, with the voltage switching dial 4 set to the 20V position, the power switch 5 was turned on, and the halogen lamp 1 was turned on and held for 90 seconds.

Next, switch the voltage switching dial 4 to the 75V position and
After irradiation with visible light for 20 seconds, the power switch 5 was turned off.

The cured product of the crown-shaped hard resin thus obtained does not impair the shape shaped in the initial stage of work,
It was fully cured as a whole.

Embodiment 2: FIG. 2 is a partially cutaway structural view of a second embodiment according to the present invention, and its electric circuit diagram is as shown in FIG.

In this device, a halogen lamp is placed above the turntable 12.
10 and a fluorescent lamp 11 are provided, and according to the time set by the halogen lamp / fluorescent lamp switching timer 13, from the lighting state of the fluorescent lamp (the halogen lamp is off) to the lighting state of the halogen lamp (the fluorescent lamp is It is designed to be switched off).

Next, a method of curing the visible light-curing resin with the main curing device will be described.

First, 90 parts by weight of methyl methacrylate, 10 parts by weight of triethylene glycol dimethacrylate, camphor quinone
A photopolymerizable resin having a composition of 0.1 part by weight and benzoyl peroxide 0.1 part by weight was prepared, sufficiently stirred, and then filled in a predetermined amount in a translucent molding die for contact lens molding made of poly (4methyl) pentene. It was placed on the turntable 22 of the main curing device.

And halogen lamp / fluorescent lamp. The switching timer was set to 15 minutes, the power switch 14 was turned on, and the fluorescent lamp 11 started light irradiation.

After about 15 minutes, the function of the timer 13 turned off the fluorescent lamp 11 and turned on the halogen lamp 10 to increase the light intensity.

20 minutes after the halogen lamp 10 was turned on, the power switch 14 was turned off to complete the curing.

The translucent molding die was taken out of the device from the turntable 2, and the mold was opened to obtain a cured contact lens-like photocured molding.

The contact lens-shaped molded product obtained in this manner had no optical distortion, and the radius of curvature also accurately copied the radius of curvature of the molding die.

Embodiment 3: FIG. 3 shows a partially cutaway structural view of a third embodiment according to the present invention, and FIG. 6 shows an electric circuit diagram thereof.

In the device of this example, the turntable 22 on which the object to be irradiated is placed
A 250 W halogen lamp 20 with a large output and a 100 W halogen lamp 21 with a relatively small output are provided above.

In the main curing device, the high-output halogen lamp 20 is turned on as soon as the power switch 25 is turned on, and the timer 1 (23) for setting the lamp switching time is timed out, so the halogen lamp 20 is turned off and the halogen lamp of low output is output. The lamp 21 lights up.

The main curing device is further equipped with a timer 2 (24) for setting the lamp switching time.
As the time elapses, the small output halogen lamp 21 is turned off and the large output halogen lamp 20 is turned on again. The power switch 25 may be turned off when the irradiation is finished.

Next, a method of curing the visible light-curing resin using the main curing device will be described.

First, in order to produce a dental denture base, a visible light-curing resin: "Epolex D" (trade name: manufactured by NOF CORPORATION) was pressed onto a plaster model and placed on the turntable 22.

Next, after setting the lamp switching time setting timer 1 (23) for 2 minutes and the lamp switching time setting timer 2 (24) for 10 minutes, turn on the power switch 25 and turn on the high output halogen lamp 20 first. It was

After 2 minutes, the high output halogen lamp 20 is turned off and the small output halogen lamp 21 is turned on by the function of the lamp switching setting timer 1 (23), and after a further 10 minutes, the lamp switching setting timer 2 (24 ), The high output halogen lamp 20 was turned on again and the small output halogen lamp 21 was turned off.

After 5 minutes, the power switch 25 was turned off to complete the curing.

The denture base thus obtained was well compatible with the model, and the effects of deformation due to polymerization shrinkage and thermal expansion were extremely small.

Comparative Example 1: In the curing device used in Example 1, the voltage switching dial 4 was set at the position of 75 V, and the crown-shaped irradiation target object was set to 180 in the same manner as in Example 1 without changing the illuminance of visible light.
Irradiation with visible light was performed for a second.

The cured product thus obtained needed to be modified because sagging due to resin flow was observed in the surface layer portion.

Comparative Example 2: Using the curing device used in Example 2, only the fluorescent lamp 11 was turned on for 60 minutes without turning on the halogen lamp 10.
A contact lens-shaped molded product was cured in the same manner as in Example 2.

The contact lens-like molded product thus obtained had no optical distortion, but had poor strength and was easily deformed / destroyed, so that it could not be practically used.

Further, using the curing apparatus used in Example 2, only the halogen lamp 10 was turned on for 30 minutes without turning on the fluorescent lamp 11, and the contact lens-shaped molded product was cured in the same manner as in Example 2.

The contact lens-shaped molded product thus obtained had a desired mechanical strength, but optical distortion was observed and crack-like defects were generated on a part of the lens surface,
It could not be used for practical purposes.

(Effects of the Invention) As described above, according to the present invention, the following excellent operational effects can be obtained.

(1) By changing the illuminance at the time of light irradiation, it is possible to control the polymerization rate of the visible light-curing resin, and thus it is possible to drastically reduce the occurrence of internal strain and cracks in the cured product.

(2) It is possible to prevent sagging (deformation) of a photopolymerizable resin having shaping properties such as a dental technique due to an increase in temperature due to increase in illuminance.

(3) Since the illuminance can be changed and the temperature rise during visible light irradiation can be effectively controlled accordingly, the dimensional accuracy of the polymer is significantly improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway structural view of a first embodiment device of the present invention, FIG. 2 is a partially cutaway structural view of a second embodiment device, and FIG.
FIG. 4 is a partially cutaway structural view of the device of the embodiment, FIG. 4 is an electric circuit diagram of the device of FIG. 1, FIG. 5 is an electric circuit diagram of the device of FIG. 2, and FIG. An electric circuit diagram of an example device is shown, respectively. 1: Halogen lamp, 2: Turntable, 3: Lamp output variable transformer, 4: Voltage switching dial, 5: Power switch, 6:
Cooling fan, 7: Dial for changing turntable, 8, 9: Electric circuit of turntable, 10: Halogen lamp, 11: Fluorescent lamp, 12: Turntable, 13: Halogen lamp / fluorescent lamp / switching timer, 14 : Power switch, 15: Cooling fan, 16: Turntable variable dial, 17: Turntable variable transformer, 18: Variable speed motor, 19: Lamp switching power relay, 20: Halogen lamp (250W for high output) , 21: Halogen lamp (100W for small output), 22: Turntable, 23: Lamp switching time setting timer 1, 24: Lamp switching time setting timer 2, 25: Power switch, 26: Cooling fan, 27: Turntable variable dial, 28: Turntable variable transformer, 29: Variable speed motor, 30: Lamp switching power relay

Claims (4)

[Claims] 1. A curing apparatus for a visible light-curing resin for producing a thick cured product using a visible light-curing resin, comprising a visible light generator and a visible light irradiation stage, and a visible light generator. Is provided with a visible light source and means for changing the illuminance of visible light with the passage of time of visible light polymerization, and a curing device for a visible light polymerization resin. 2. The visible light source is a halogen lamp or a xenon lamp, and the means for changing the illuminance of visible light with the passage of time of visible light polymerization comprises a means for changing the electric power supplied to the halogen lamp or the xenon lamp. The curing device for a visible light-curing resin according to claim 1, wherein 3. The visible light source comprises a plurality of halogen lamps or xenon lamps, and the means for changing the illuminance of visible light with the passage of time of visible light polymerization comprises means for changing the number of lamps to be turned on in multiple stages. The visible light-curable resin curing apparatus according to claim 1, wherein 4. A lamp comprising two or more kinds of different visible light sources, wherein the means for changing the illuminance of visible light with the passage of time of visible light polymerization is constituted by means for switching the kind of lamp to be turned on. A curing device for a visible light-curing resin according to any one of claims 1 to 3.