JP4141855B2 - Light irradiation device for dental photopolymerization type composite resin - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dental photopolymerizable composite resin that is an object to be irradiated by irradiating irradiation light having a specific wavelength selected in accordance with the characteristics of the photopolymerization catalyst of the dental photopolymerizable composite resin used in dental treatment. The present invention relates to a light irradiation apparatus for dental photopolymerization type composite resin that can be polymerized and cured satisfactorily.
[0002]
[Prior art]
Combined with recent improvements in performance, dental photopolymerizable composite resins are easy to impart forms that are not uncomfortable with natural teeth (operability) and have a color tone similar to natural teeth (esthetics) It has gained a great demand among clinicians for its superiority. Such an increase in demand has not only led to higher performance of the dental photopolymerization composite resin itself, but has also promoted the development of peripheral devices for using this material.
[0003]
Until now, as a light irradiation device for polymerizing and curing a dental photopolymerization composite resin filled in the teeth of the patient's oral cavity, the external shape has a shape like a hair dryer, and a light source is used inside it. A cylindrical light guide (generally made of a transparent material to guide the light irradiated to the dental photopolymerization composite resin that contains a halogen lamp or xenon lamp and is filled in the target tooth. Is a bundle of glass fibers) that can be attached to the tip of the glass fiber.
[0004]
The reason why the conventional light irradiation apparatus has to have such a configuration is as follows.
First, a halogen lamp or a xenon lamp is most suitable as a light source capable of obtaining necessary and sufficient light for polymerizing and curing a dental photopolymerizable composite resin. However, since these light sources generate a large amount of heat when they are turned on, if they are not cooled, not only the life of the lamp itself but also the device itself is damaged.
[0005]
Therefore, since the light source cooling mechanism using the cooling fan is indispensable, the light irradiation device cannot be smaller than a certain size, and naturally the power consumption is large, so In order to provide the desired functions, such as the need to supply power, and a large transformer is required to cover the large power consumption of this light source, storage and placement of peripheral function parts is required. I had to consider it.
[0006]
For this reason, light irradiation devices that use halogen lamps or xenon lamps as light sources can suffer from this noise by reducing the size of the devices to improve their usability and eliminating the need for cooling fans that generate noise. It is possible to eliminate giving to the patient, to eliminate the harmful effects on the treatment work with the cordless power supply to the light source, and to freely select the length of the light guide (light guide If the length of the air is too short, there is a risk that the cooling air that has become hot air will be blown directly onto the patient's face, so a certain length (distance) must be secured) Thus, it was impossible to mechanically construct a light irradiation device that was light and excellent in operability.
[0007]
By the way, in order to photopolymerize a dental photopolymerization type composite resin which is widely used at present, a combination of camphorquinone and tertiary amine is most often used as a photopolymerization catalyst. And the characteristic of this camphorquinone became clear as a result of research efforts of many researchers. That is, it has been found that the light wavelength range to which camphorquinone is sensitive absorbs light in the range of 20 to 30 nm before and after the peak at 470 nm most efficiently. This wavelength range is visible light and light in the blue region.
[0008]
On the other hand, for example, a halogen lamp used as a light source emits light in a wide light wavelength range of 350 to 800 nm. From this light, the wavelength required for photopolymerization of a dental photopolymerizable composite resin is obtained. Light was extracted and used by interposing a wavelength selection filter. At this time, it is said that the intensity (brightness) of the light is attenuated to about 1/10 by using this wavelength selection filter. This halogen lamp not only has a significant decrease in light intensity even in normal use (60 to 70% in about 25 hours), but it cannot be said to have a very long life (about 50 hours). . Furthermore, since a transient current that becomes a large load flows when the lamp is turned on, it is vulnerable to flashing, that is, each time the lamp flashes, the life of the lamp itself is shortened. Therefore, in order for the dental photopolymerizable composite resin to perform complete photopolymerization, it has always been necessary to pay attention to the lamp life and usage conditions.
[0009]
However, in response to the development of LEDs that emit blue light from around 1994 and 7, various ideas and proposals have been made for incorporating and using these LEDs in a light irradiation device. As a typical example, a plurality of light emitting diodes having a peak emission wavelength in the range of 430 to 480 nm, optical system means for condensing the light of these light emitting diodes, and light collected by the optical system means are output. There is a “light-curing resin curing light source device” (for example, see Patent Document 1) configured by light irradiation means, and it has been published as a research document in an academic society (for example, see Non-Patent Document 1).
[0010]
In response to these research literatures, and further enhancement of LED performance, light irradiation devices using high-intensity blue LEDs are actually sold as products from domestic and overseas companies and used in actual clinical settings. It has become to. These product catalogs allege that the above-mentioned technical problems that could not be solved because the light source was a lamp were eliminated. That is, there are advantages such as small size and light weight, cordlessness, low power consumption, quietness, and semi-permanent lifetime of the light source. As described above, a light irradiation apparatus for photopolymerizing a dental photopolymerizable composite resin has achieved rapid progress and development.
[0011]
[Patent Document 1]
Japanese Patent No. 2997522 [Non-Patent Document 1]
Journal of Japanese Society for Dental Preservation, Vol. 39, No. 1, Fujibayashi et al., “Study on Irradiator Using Blue Light-Emitting Diode”
[0012]
On the other hand, the photopolymerizable dental composite resin that is photopolymerized has not changed at all. In other words, the combination of camphorquinone and tertiary amine continues to be employed as it is as a photopolymerization catalyst. However, this camphorquinone has a yellow color as its unique property (preferably because healthy natural teeth are yellowish), but its yellowness fades after polymerization and curing by light irradiation, In addition, the remaining yellowish color may also fade as a change over time. Therefore, even if color matching is performed with difficulty from the viewpoint of aesthetic dentistry, there is a drawback that the color is already different at the stage of polymerization and curing.
[0013]
In addition, since it is used in combination with tertiary amines, the storage stability of the material is not so good (the unused dental photopolymerizable composite resin may be altered over time). There are also drawbacks. In order to cope with such drawbacks, development and research of a dental photopolymerization type composite resin using a new photopolymerization initiation assistant has been awaited.
[0014]
By the way, another voice of dissatisfaction has been raised from the clinician who uses the light irradiation apparatus equipped with the high-intensity blue LED as the light source. Compared to the previous photopolymerization using halogen lamps, the photopolymerization using high-intensity blue LEDs has a shallower curing depth (depth from the surface where polymerization and curing have been sufficiently performed) of the dental photopolymerization composite resin, and the unpolymerized part. In view of maintenance, there is a lack of reliability as a prosthesis for teeth. In other words, there are many phenomena that fall out of the tooth in a short period after treatment.
[0015]
Further, in order to cope with the above-described camphorquinone discoloration (original yellow color fades), an acylphosphine oxide [trade name: Lucillin TPO (BASF) The photopolymerization initiator is a colorless and transparent photo-initiator, which makes it easy to aesthetically match colors (color measurement using only the original color of the resin). It is possible and there is no fading), so the color will be as the image. This photopolymerization initiator is a material whose sensitive light wavelength region has a peak at 380 nm, unlike camphorquinone whose sensitive light wavelength region has a peak at 470 nm.
[0016]
However, since all of the light irradiation devices for dental photopolymerization type composite resins that use LEDs currently on the market as light sources are designed only for camphorquinone, the emission wavelength is 450 to 490 nm. Since only the blue light emitting LED with a peak is used, the disadvantage of the dental photopolymerization composite resin as described above is that the curing depth is shallow and there are many unpolymerized parts. The disadvantage that it cannot be used for a dental photopolymerizable composite resin using acylphosphine oxide as an agent cannot be solved.
[0017]
[Problems to be solved by the invention]
The present invention eliminates the disadvantages of the conventional light irradiation device for dental photopolymerization type composite resin, and provides a dental photopolymerization type composite resin using a combination of camphorquinone and tertiary amine as a photopolymerization catalyst. Not only can it be cured and cured efficiently by light irradiation, but also a newly developed dental photopolymerizable composite resin using acylphosphine oxide as a photopolymerization initiator can be cured by light irradiation. It is an object of the present invention to provide a versatile light irradiation apparatus for dental photopolymerization type composite resin.
[0018]
[Means for Solving the Problems]
As a result of diligent research to solve the above-mentioned problems, the present inventors have found a phenomenon in which an unpolymerized portion remains in a dental photopolymerizable composite resin using a combination of camphorquinone and tertiary amine as a photopolymerization catalyst. It is assumed that the light wavelength range to which camphorquinone is sensitive is derived from the fact that only a high-intensity blue LED corresponding to only 20 to 30 nm before and after the peak wavelength of 470 nm is used. After confirming the curing depth by combining various LEDs that emit light in the wavelength range, near-ultraviolet and / or violet light radiation having a peak at a wavelength of 370 nm or more and less than 410 nm as an emission wavelength Light emitted from this near-ultraviolet and / or violet light emitting LED can be obtained in combination with an LED and very favorable results can be obtained. Than is the present invention has been completed by investigating the ability to newly developed applications also dental photopolymerizable composite resin using the acylphosphine oxide for polymerizing cured by light irradiation as a photopolymerization initiator.
[0019]
That is, the present invention provides a blue light emitting LED having a peak at a wavelength of 450 nm or more and 490 nm or less as a light source, and a near-ultraviolet and / or violet light emitting LED having a peak at a wavelength of 370 to 410 nm. These two types of LEDs are provided, and a changeover switch for at least lighting these two types of LEDs at the same time and for turning on only near-ultraviolet and / or violet light emitting LEDs is provided. It is the light irradiation apparatus for dental photopolymerization type composite resins.
[0020]
Also, in such a dental photopolymerization type resin light irradiation device, a switch for selecting the lighting time of the light emitting LED from a plurality of preset times and / or a time setting switch that can be set to an arbitrary time are provided. If it is, it will be possible to irradiate light in advance with the designated time of light irradiation of dental photopolymerization type composite resin sold by multiple manufacturers, so it is possible to reduce labor and dental photopolymerization type composite It was also found that the irradiation time can be set according to the amount of resin used, which is preferable.
[0021]
Further, in such a light irradiation device for a photopolymerization resin for dental use, if a filter for blocking ultraviolet light having a specific wavelength or less is provided between the light emitting LED and the light irradiation port, a carcinogenic effect is obtained. Therefore, they have also found out that it is possible to effectively and reliably remove inconvenient short-wavelength ultraviolet rays that are harmful to the human body.
[0022]
Furthermore, in such a light irradiation device for dental photopolymerization type resin, the output ratio of the blue light emitting LED and the near ultraviolet and / or violet light emitting LED is 9: 1 to 5: 5. When curing not only dental photopolymerizable composite resins using acylphosphine oxide as a polymerization initiator but also dental photopolymerizable composite resins using a combination of camphorquinone and tertiary amine by light irradiation. This is preferable because it eliminates the inconvenience that unpolymerized portions remain and obtains a completely polymerized cured product and shortens the irradiation time of light.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, although the Example of the light irradiation apparatus for dental photopolymerization type composite resins which concerns on this invention with reference to drawings is described in detail, this invention is not limited by the following embodiment.
[0024]
FIG. 1 is a cross-sectional explanatory view illustrating the configuration of one embodiment of a light irradiation apparatus for a dental photopolymerizable composite resin according to the present invention, and FIG. 2 is a dental photopolymerizable composite resin according to the present invention shown in FIG. FIG. 3 is a block circuit diagram illustrating a schematic configuration of an electric circuit of a dental photopolymerization composite resin light irradiation device according to the present invention; FIG. 4 is a spectral characteristic explanatory diagram for explaining the emission spectral characteristics of the LED used in the light irradiation apparatus for dental photopolymerization type composite resin according to the present invention.
[0025]
In the drawings, reference numeral 1 denotes a substantially columnar light irradiator main body having a tapered end and a maximum diameter of about 35 to 45 mm so that a person can easily hold it by hand. This light irradiator body 1 is made of a lightweight alloy for balance and design convenience, even if the entire body is made of resin, in order to reduce the weight so that the user is not burdened by weight. May be.
[0026]
Reference numeral 2 denotes a glass optical fiber or plastic optical fiber that has almost no optical transmission loss, and is inserted into an insertion hole that is a light irradiation port whose rear end portion is formed at substantially the center of the distal end portion 1a of the light irradiator body 1. It is a light guide that bundles light transmitting fibers such as. The distal end side of the light guide 2 is slightly curved as shown in order to make it easy to irradiate light onto the dental photopolymerization composite resin 3a filled in the tooth 3 in the oral cavity as a prosthesis. It is preferable. In addition, it is preferable that a plurality of light guides 2 having different lengths are prepared in accordance with the portion of the tooth 3 to be irradiated in the oral cavity because the usability is improved for the user.
[0027]
Reference numeral 4 denotes a control circuit housed in the light irradiator body 1. As shown in FIG. 1, the control circuit 4 is basically subjected to ON / OFF control by a main switch 4 a provided at the rear end of the light irradiator body 1. In response to the operation / setting of each switch described later, the control circuit 4 controls the lighting time of the light emitting LEDs 5 and 6 described later, and displays the set lighting time. In addition to this, it goes without saying that a circuit indicating the remaining amount of electric power of a battery 9 (described later) built in the light irradiator body 1 may be incorporated in the control circuit 4 in advance.
[0028]
5 is a blue light emitting LED housed in the light irradiator body 1 and having a light emission wavelength having a peak at a wavelength of 450 nm or more and 490 nm or less that is arranged in the vicinity of the axial center of about 5 to 9, The use of high brightness light emitting LEDs that are widely used in the current market is preferred.
[0029]
6 is a near-ultraviolet and / or violet light-emitting LED having a peak at a wavelength of 370 nm or more and less than 410 nm, which is disposed around the blue light-emitting LED 5 and having about 4 to 10 emission wavelengths. It is preferable to use a near-ultraviolet and / or violet light-emitting LED that is widely used for irradiation to an antibacterial / deodorizing member carrying a photocatalyst disposed in an air conditioner or the like.
[0030]
In a normal surgical procedure in dental treatment, the surface of the tooth 3 to be irradiated (filled dental photopolymerization composite resin 3a) is used 1 mm to 2 mm apart. In addition, dental photopolymerization composite resin using acylphosphine oxide as a photopolymerization initiator to be used for the light irradiation apparatus according to the present invention, and dental light using a combination of camphorquinone and tertiary amine When polymerized composite resin is irradiated with light, it is polymerized compared with conventional photopolymerization type composite resin, which uses only a combination of camphorquinone and tertiary amine as a photopolymerization catalyst. Since the curing reaction takes place rapidly, the objective can be achieved even if the output of near-ultraviolet and / or violet light radiation is small. Therefore, it is sufficient that the ratio of the light output emitted from the blue light emitting LED 5 and the light output emitted from the near ultraviolet and / or violet light emitting LED 6 is about 9 to 1 to 5 to 5 as a total amount. .
[0031]
That is, when the dental photopolymerization composite resin using the two types of photopolymerization catalysts as described above is polymerized and cured using the light irradiation apparatus according to the present invention, the blue light emitting LED 5 and the near ultraviolet ray and / or When the light output from the violet light emitting LED 6 is about 9: 1 to 5: 5 as a ratio of the total amount, the dental photopolymerization type composite resin produced when using the conventional LED light irradiation device is used. This is preferable because not only a completely polymerized cured product can be obtained by eliminating the inconvenience that unpolymerized portions remain, but also the light irradiation time can be shortened.
[0032]
Although not shown, depending on the type of the dental photopolymerization composite resin 3a that is an object to be irradiated by the light irradiation apparatus according to the present invention, it is warmed by receiving light rays on the long wavelength (green or red) side. Some products are more polymerized and hardened in this state (it is known that the light on the long wavelength side has the effect of warming the irradiated object), so there are several green in the arrangement area of the blue light emitting LED 5 And / or LEDs emitting red light may be provided. In this case, the intended purpose can be achieved by using LEDs emitting green and / or red light rays so as to occupy about 10% of the total light output. The light emission wavelength of the halogen lamp, which is highly reliable for the polymerization / curing of the dental photopolymerizable composite resin 3a, by configuring the LED arranged in the light irradiator body 1 as described above. It is also possible to take a place with good characteristics.
[0033]
7 is arranged on the outer peripheral side located slightly forward of half of the entire length of the light irradiator main body 1 and is used for simultaneously lighting at least the blue light emitting LED 5 and the near ultraviolet and / or violet light emitting LED 6 at the same time. This is a changeover switch for turning on only the ultraviolet ray and / or violet ray emitting LED 6. By operating this change-over switch 7, it becomes possible to irradiate light in accordance with the characteristics of the dental photopolymerization composite resin 3a used as a prosthesis for filling the tooth 3 or the like. In addition, it is preferable to provide a display unit at a predetermined position of the light irradiator body 1 so that it is possible to determine what wavelength of light is irradiated by the operation of the selector switch 7.
[0034]
8 is arranged in the light irradiator main body 1 so as to be adjacent to the changeover switch 7, and is set in advance to control the lighting time of the light emitting LEDs 5, 6 (for example, 5 seconds, 10 seconds). This is a time setting switch for selecting arbitrarily from 4 types of seconds, 20 seconds and 40 seconds). In the case of this example, according to the number of times the time setting switch 8 is pressed, a new non-standard time is set by appropriately combining the four types of times described above (for example, combining 5 seconds and 10 seconds). 4 times display LEDs 8a arranged on the outer periphery of the rear end of the light illuminator body 1 may be set, and the selected time or the set time may be set. It is displayed by lighting or flashing.
[0035]
Reference numeral 9 denotes a battery housed on the rear side of the light irradiator body 1. The control circuit 4 is operated by the power stored in the battery 9 and power for lighting the light emitting LEDs 5 and 6 is supplied. Is done. In the illustrated embodiment, the power supply to the battery 9 includes connection electrodes 9a and 9a arranged so as to be located on the side opposite to the time display LED 8a at the rear end of the light irradiator body 1. This is done by connecting to the electrodes of the charging stand 11 described later. The power supply to the battery 9 may be unrelated to the main switch 4a described above. Further, it goes without saying that the electric power may be stored by using the induced electromotive force without using the connection electrodes 9a, 9a exposed to the outside.
[0036]
No. 10 has a specific wavelength or less, particularly a carcinogenic action, located between the light guide 2 mounting portion of the light irradiator main body 1 and the light emitting LEDs 5 and 6. This is a filter having a disk shape for blocking ultraviolet rays with an inconvenient short wavelength, for example, less than 370 nm, which is harmful to the human body. As shown in FIG. 1, the shape of the filter 10 is such that the central portion facing the blue light emitting LED 5 has the same thickness, and the portion facing the near ultraviolet ray and / or violet light emitting LED 6 approaches the tip. A tapered prism shape is preferable because the properties of light can be used well.
[0037]
When the light irradiator body 1 is not used and charged, it is inserted into the insertion groove 11a of the charging stand 11 and stored as shown in FIG. At this time, if the plug 11b is inserted into a plug (not shown) of the AC power source and the charging stun domain switch 11c is turned on, the battery 9 is automatically charged. In addition, the charging status display LED 11d is provided at a position that is easily visible on the charging stand 11 so that the charging status can be seen at a glance, and it can be determined how much charge is reached compared to the fully charged status. It is preferable that it is made so.
The relationship between the elements described above is outlined in the block circuit diagram illustrating the schematic configuration of the electric circuit in FIG.
[0038]
【The invention's effect】
As described in detail above, the light irradiation device for dental photopolymerization type composite resin according to the present invention generates heat by not using a halogen lamp or a xenon lamp as a light source which is a feature of the existing LED light irradiation device. In addition to having all the effects of quietness due to the absence of a cooling fan, the convenience of cordless handling and no need to consider the reduction in the life of the light source, camphorquinone and tertiary amine as conventional photopolymerization catalysts Dental photopolymerization composite resin using a combination of these two has the ability to reliably polymerize and harden, and dental light using acylphosphine oxide as a newly developed photopolymerization initiator in recent years Innovative dental photopolymerization type that can cope with polymerization and curing of polymerization type composite resin A Npojittorejin light irradiation device is contributing However those large technical improvement of dental care.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view illustrating the configuration of one embodiment of a light irradiation apparatus for a dental photopolymerization type composite resin according to the present invention.
2 is a perspective explanatory view showing a state where the light irradiation device for a dental photopolymerization type composite resin according to the present invention shown in FIG. 1 is placed on a charging stand. FIG.
FIG. 3 is a block circuit diagram illustrating a schematic configuration of an electric circuit of a light irradiation apparatus for a dental photopolymerization composite resin according to the present invention.
FIG. 4 is a spectral characteristic explanatory diagram illustrating a light emission spectral characteristic of a light emitting LED used in the light irradiation apparatus for a dental photopolymerization composite resin according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Light irradiator main body 1a Tip part 2 Light guide 3 Tooth 3a Dental photopolymerization type composite resin 4 Control circuit 4a Main switch 5 Blue light emission LED
6 Near UV and / or violet LED
7 Changeover switch 8 Time setting switch 8a LED for time display
9 Battery 9a Connecting electrode 10 Filter 11 Charging stand 11a Inserting groove 11b Plug 11c Charging stanza domain switch 11d Charging status display LED

Claims (4)

  As a light source, a blue light emitting LED (5) having a peak at a wavelength of not less than 450 nm and not more than 490 nm, and a near-ultraviolet and / or violet light emitting LED (6) having a peak at a wavelength of not less than 370 nm and less than 410 nm. And two types of LEDs (5, 6) are provided, and at least these two types of LEDs (5, 6) are turned on at the same time, and only near-ultraviolet and / or violet light emitting LEDs (6) are turned on. A light irradiation device for a dental photopolymerization type composite resin, characterized in that a changeover switch (7) is provided.   2. A switch for selecting a lighting time of the light emitting LED (5, 6) from a plurality of preset times and / or a time setting switch (8) which can be set at an arbitrary time. Light irradiation device for dental photopolymerization composite resin.   The dental photopolymerization type composite resin according to claim 1 or 2, wherein a filter (10) for blocking ultraviolet rays having a specific wavelength or less is disposed between the light emitting LED (5, 6) and the light irradiation port. Light irradiation device.   The dental ratio according to any one of claims 1 to 3, wherein the ratio of the output of the blue light emitting LED (5) to the near ultraviolet and / or violet light emitting LED (6) is 9: 1 to 5: 5. For photopolymerization type composite resin.

Images