JP2006167308A - Light irradiation device for dental restoration - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light irradiating chip which improves adhesiveness of photocuring resin to a cavity in dental treatment. <P>SOLUTION: The light irradiating chip 6 having a light generation element is inserted into the photocuring resin 4 packed into the cavity 3 of a tooth and used for light irradiation. The chip 6 consists of a non-adhesive member. Thus, when the photocuring resin 4 shrinks by light irradiation, the photocuring resin 4 is separated from the chip 6 and a gap is generated between the chip 6 and the photocuring resin 4. The adhering surface side of the photocuring resin is bonded with an adhering material 9 whose polymerization and shrinkage is controlled and which is applied firmly to the inner wall of the cavity. Into a photocuring resin hole from which the chip 6 is pulled out, a conventional post is inserted or the photocuring resin 4 is packed again and photopolymerized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light irradiation apparatus for dental restoration which is a photopolymerizer for dentistry. Specifically, the present invention relates to a light irradiation device for dental restoration for photopolymerizing and bonding a resin filled in a cavity of a tooth.

  In dental treatment, etc., recently, a photocurable resin is filled in the cavity of the tooth to be treated, cured by irradiation with light, and is integrated with the tooth, so that the teeth are esthetically restored. Yes. In addition, in the construction of an abutment after endodontic treatment, an abutment construction method using a resin is frequently used in place of metal which has been the mainstream in the past. Most of the resin filling in the carious cavity is a photo-curing resin, and a chemical polymerization type or a chemical polymerization / photo-polymerization type resin is used for abutment construction.

  When filling the photocurable resin, a bonding material (adhesive) is applied and polymerized and cured in order to adhere the photocurable resin to the inner wall of the cavity. After the bonding material is applied and polymerized and cured, the photocurable resin is filled and the photocurable resin is cured by photopolymerization with light irradiation. After curing, cutting or polishing is performed to restore the original tooth shape or form an abutment tooth to restore the function of the tooth. A conventional curing method after filling a photocurable resin is to irradiate the surface of the photocurable resin with light. In order to irradiate the light evenly, the applicant of the present application has proposed a light irradiation auxiliary chip that is inserted into a resin filled in a cavity of a tooth and irradiated with light (Patent Document 1).

As a light source for this light irradiation, a halogen lamp, a xenon lamp, an arc, an LED (light emitting diode), or the like is used. The light emitted from the light source is guided by a light guide formed of glass fibers and irradiated to a photocurable resin filled in the cavity. Many of the photopolymerizers for irradiating light in this way are hand-held type with a built-in light source and light guide. (See, for example, Patent Document 1 and Patent Document 2).
JP2003-310642A Opening 2003-52719 Opening 2003-190184

  As described above, dental treatment for caries or abutment construction is performed by filling a cavity formed in a repaired tooth with a photocurable resin and curing it. In order to strengthen the adhesion, ultrasonic cleaning or the like is performed in the cavity, and after drying, pretreatment for adhesion with a primer, a bonding agent or the like is performed. Thus, the adhesive surface is treated with careful treatment. However, the curing of the photo-curing resin has a problem peculiar to photo-curing because only the surface of the filled photo-curing resin is irradiated and cured, and is completely adhered to the inner wall of the cavity. It may not be possible.

  When the cavity is deep, it is considered that polymerization curing starts from the light irradiation proximity portion of the photocurable resin, and the resin is pulled in the surface direction to shrink the resin, and a gap is likely to be generated at the adhesion interface. This means that in the living environment after treatment, there is a gap on the bonding surface, so that the bonded state cannot be maintained during the engagement and may be peeled off. If a gap occurs in the restoration stage, it is not possible to guarantee a sufficient period of use of the tooth, and if the use is continued with the gap, there is a possibility that the tooth decay may be advanced, which causes a problem. there were. Accordingly, there has been a demand for a method for curing a photocurable resin that can control polymerization shrinkage without such gaps.

Further, the therapist holds the photopolymerizer by hand and works by placing the irradiation port of the photopolymerizer on the irradiated surface. Depending on the operator, the distance between the irradiation port of the photopolymerizer and the irradiated surface varies. Since the light emitted from the light source passes through the light guide and is irradiated from the irradiation port to the treated tooth, the light is attenuated. It is desirable to shorten the distance until the light emitted from the light source is applied to the photocurable resin to reduce light attenuation.
The present invention solves the above-mentioned problems and achieves the following objects.
An object of the present invention is to provide a light irradiation device for dental restoration that can start polymerization not from the surface of a filled photocurable resin but from the inside thereof to increase the adhesive strength with a tooth. It is in.

Another object of the present invention is to provide a light irradiation device for dental restoration in which a light generating element is incorporated and light for photopolymerization generated from the light generating element is irradiated to a photocurable resin without attenuation. is there.
Another object of the present invention is to provide a light irradiating apparatus for dental restoration in which the polymerization treatment for the filled photocurable resin is made smooth so that the restoration can be efficiently performed.

In order to achieve the above object, the present invention is achieved by the following means.
The light irradiation apparatus for dental restoration of the present invention is for irradiating light to polymerize and cure a photocurable resin for dental treatment.
The light irradiation device for dental restoration according to the present invention comprises a light irradiation chip incorporating one or more light generating elements for generating the light, and the light irradiation chip is formed in a shape along the cavity of the tooth. And is inserted into the photocurable resin filled in the cavity and is configured to be extracted after photopolymerization.
The light irradiation tip may be a pointed member with a thin tip.
Moreover, the said chip | tip for light irradiation is good to be comprised with the non-adhesive member which does not adhere to the said photocurable resin.

Furthermore, it is preferable that the light irradiation tip is along a post shape inserted into the photocurable resin filled in the cavity.
Furthermore, the light irradiation device for dental restoration has a power supply unit for supplying power to the light generating element, and the power supply unit is connected to the light irradiation chip by an electric wire via a detachable connector. Good to have been.
The photocurable resin may be filled after an adhesive is applied and cured in the cavity.
However, application of this adhesive is not necessarily required if the photocurable resin is directly bonded to the cavity of the tooth.

  The advantage of the present invention is that it is inserted into a photocurable resin filled in the core cavity of the tooth and irradiated with light, so that when the photocurable resin contracts, it is peeled off from the light irradiation chip and irradiated with light. A gap is generated between the chip and the photocurable resin, and the adhesive surface side of the photocurable resin is firmly bonded with the polymerization shrinkage controlled. As a result, it is possible to perform a treatment that allows for easy, reliable and stable restoration of a tooth and enables maintenance of the tooth for a long time after the restoration. In addition, it has a built-in light generating element, and light for photopolymerization generated from the light generating element is irradiated to the photo-curing resin without being attenuated. Become.

  The light irradiation apparatus for dental restoration according to the present invention has an effect that the restoration of a tooth is simple, reliable and stable, and a treatment that enables maintenance of the tooth for a long time after the restoration is possible. In addition, light for photopolymerization is emitted from the light source and irradiated to the photocurable resin without being attenuated, so that it is possible to reduce the size of the light source, save power, and reduce power consumption.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a tooth 1 after the construction of an abutment that has been treated by applying the light irradiation tip for dental restoration of the present invention. FIG. 1 is schematically shown for easy understanding. The structure of the tooth 1 after the abutment is constructed is that a photocurable resin 4 (low-viscosity composite resin, photopolymerization resin) and a pre-made post 5 are inserted as a restoration material into the core cavity 3 provided on the restoration target tooth 2. It is sectional drawing which showed the state of the tooth 1 which was constructed and formed the abutment tooth.

[Explanation of light irradiation chip]
FIG. 2 illustrates a light irradiation tip 6 for dental restoration according to the present invention. The light irradiating chip 6 is used to fill the core cavity 3 with the light curable resin 4 and then insert the light curable resin 4 into the uncured photo curable resin 4 to irradiate the photo curable resin 4 from the inside to perform photopolymerization. Is done. The light irradiation tip 6 has a conical shape, and one end forms a pointed portion 6 a and is easy to insert into the photocurable resin 4. This light irradiation chip 6 includes a light generating element 21. The light generating element 21 is for generating light for photopolymerizing the photocurable resin 4.

  Since the light generated from the light generating element 21 is directly irradiated onto the photocurable resin 4, there is almost no attenuation. The light generating element 21 operates by supplying power from a power supply device (not shown), and generates light for photopolymerization. Necessary power is supplied by a cord 22 from a power supply device (not shown). The light irradiation chip 6 is configured to be detachable from the connector 20 provided at the end of the cord 22.

One end of the light irradiation chip 6 is a connector 6 b that is detachably attached to the connector 20. The connector 20 and the connector 6b have a paired structure and are detachable. The connector 6 b has a shape extended to the light irradiation chip 6. The shape of the connector 6b can be changed as necessary. Although not shown, the light irradiation tip 6 can be easily replaced with another shape of the light irradiation tip 6 if the tooth repair site or the cavity shape is different.
The light generating element 21 is a known LED (light emitting diode), and a detailed description thereof is omitted. The light generated from the light generating element 21 must have sufficient intensity and wavelength band to cure the photocurable resin 4. For this reason, the light of the wavelength of the vicinity optimal for hardening of the photocurable resin 4 is generate | occur | produced. The wavelength of the generated light is generally preferably 430 to 480 nm.

[About the control panel]
FIG. 18 shows a control panel 50 of a power supply device for supplying power to the light irradiation chip 6. The control panel 50 is connected to the light irradiation chip 6, supplies power to the light irradiation chip 6, and controls the irradiation intensity and irradiation time of the light irradiation chip 6. In the upper area of the control panel 50, a display panel 51 having a level 52 and an irradiation time 53, which is a display for displaying the irradiation intensity and irradiation time of the light irradiation chip 6, is arranged.

  The irradiation intensity of the light irradiation chip 6 can be selected from multiple levels depending on the irradiation intensity, and this level is displayed on the level display unit 52 as a numerical value. The irradiation time of the light irradiation chip 6 is displayed on the irradiation time display unit 53 in units of minutes and seconds. In the lower area of the display panel 51, there are a level setting button 54 and an irradiation time setting button 55 which are buttons for setting the irradiation intensity and irradiation time of the light irradiation chip 6. The level setting button 54 and the irradiation time setting button 55 are push buttons. However, the level setting button 54 and the irradiation time setting button 55 may be adjusted by rotating them.

  In the lower region of the display panel 51, a light irradiation chip connection terminal 56 for connecting to the light irradiation chip 6 and a power switch 57 for turning on and off the entire power supply of the control panel 50 are arranged. A power cord 22 (see FIG. 2) connected to the light irradiation chip 6 is connected to the light irradiation chip connection terminal 56 by insertion.

[About the circuit]
FIG. 19 conceptually shows the inside of the power supply device for supplying power to the light irradiation chip 6 and the electric circuit of the light irradiation chip 6. The electric circuit of FIG. 19 is an example of a circuit for supplying and controlling power to the light irradiation chip 6, and since the circuit and function of each element constituting this electric circuit are well-known techniques, the function Only the outline of is briefly described. This electric circuit includes a power supply circuit 60, a control circuit 61, a pulse generation circuit 63, and a light irradiation chip circuit 62.

  A portion surrounded by a dotted line is an electric circuit inside the power supply device and the display panel 51, and a light irradiation chip circuit 62 illustrated outside the dotted line indicates an internal circuit of the light irradiation chip 6. The power supply circuit 60 is a circuit for supplying power to the light irradiation chip 6 and other circuits, and is connected to a commercial AC power supply or a DC power supply. In the case of being connected to a commercial AC power supply, it is preferable that the AC power supply is constituted by a full-wave rectifier circuit in which four diodes are bridge-connected, a step-down resistor, a capacitor, or the like. A battery or the like is used as the DC power source.

  The light irradiation chip circuit 62 is a circuit composed of the light generating element 21 built in the light irradiation chip 6. These light generating elements 21 are connected in parallel or in series. The control circuit 61 is a circuit for controlling the current supplied to the light irradiation chip circuit 62 and is a circuit for controlling the entire operation of the control panel 50. The control circuit 61 has a function of grasping the number of the light generating elements 21 of the light irradiation chip circuit 62 and controlling the light emission intensity and the light emitting time of the light generating elements 21.

  Since the light emission intensity of the light generating element 21 is controlled by the current supplied to the light irradiation chip circuit 62, the control circuit 61 has a current limiting circuit. The light emission time of the light generating element 21 is controlled by the duration of the current supplied to the light irradiation chip circuit 62. If a direct current having a predetermined voltage and current is continuously supplied to the light generating element 21, the light generating element 21 itself may generate heat and its performance may change. For this purpose, it is possible to drive the light generating element 21 by supplying pulse power of a predetermined frequency.

  For this purpose, a pulse is generated by the pulse generation circuit 63 and supplied to the control circuit 61. The control circuit 61 supplies the set power to the light irradiation chip circuit 62 by the pulse from the pulse generation circuit 62. The repetition frequency and pulse width of the pulses generated from the pulse generation circuit 62 are set by the level 54 of the control panel 55. The duration of the current supplied by the light irradiation chip circuit 62 is set by the irradiation time 55, and the control circuit 61 supplies and controls power according to these settings. A power supply circuit 64 for the pulse generation circuit for the pulse generation circuit 62 may be provided independently.

[How to build an abutment]
Next, a method for constructing the abutment of the tooth 2 to be repaired will be described. 3 to 10 show the series of steps. FIG. 3 shows a process of forming the core cavity 3 in the tooth 2 to be repaired. In this example, the core cavity 3 is cut with a root canal forming bar (steel bar) 8. For example, the root canal forming bar 8 is rotated by a micromotor capable of rotating at a high speed, and is generally used in dental treatment. The root canal forming bar 8 is adapted to the shape of the core cavity 3. This cutting method is not different from the case of forming a conventional metallic core cavity.

  FIG. 4 shows that the cutting pieces, which are chips in the formed core cavity 3, are washed, dried, removed and cleaned, and then a dental adhesive 9 is applied with an applicator 10 such as tweezers and a micro sponge. The process in the state of being polymerized and cured is shown. When the adhesive 9 is photocurable, it is polymerized and cured using the light irradiation chip 6. FIG. 4 is a view showing a state in which the light irradiation tip 6 is inserted into the core cavity 3 and is cured by polymerization.

  Subsequently, as shown in FIG. 5, the photocurable resin 4 is filled with a syringe 11 or the like. This photocurable resin 4 has a low viscosity. Immediately after the photocurable resin 4 is filled, the light irradiation chip 6 of the present invention is inserted into the photocurable resin 4. This state is shown in FIG. The shape of the light irradiation tip 6 is in line with the shape of the core cavity 3 so that the distance between the light irradiation tip 6 and the opposite wall of the core cavity 3 is substantially uniform. The light irradiation chip 6 generates light for photopolymerization from a built-in light generation element 21, and the photocurable resin 4 is irradiated with the light for photopolymerization.

  With the light irradiation chip 6 inserted, light is irradiated as shown by an arrow A to cause photopolymerization. Since the light is emitted from the entire light irradiation chip 6 and diffusely reflected, light having a substantially uniform intensity is emitted from the outer surface of the light irradiation chip 6. Since the back part which is the bottom of the core cavity 3 and the part close to the upper surface emit substantially uniform light, the photopolymerization of the surface of the photocurable resin 4 proceeds uniformly and is cured. Further, since the light irradiation chip 6 is a non-adhesive member, it peels off from the light irradiation chip 6 when the photocurable resin 4 contracts, and a gap is formed between the light irradiation chip 6 and the photocurable resin 4. The bonding surface side is bonded by controlling polymerization shrinkage. That is, the bonding is performed in a state where the polymerization shrinkage does not act on the peeling of the bonding interface.

  When the photocurable resin 4 is cured, the light irradiation chip 6 is pulled out. This state is shown in FIG. At the same time as the light irradiation chip 6 is pulled out, the adhesive 9 is applied to the photocurable resin hole 12 from which the light irradiation chip 6 has been removed with an applicator 10 such as tweezers and microsponge. As in the case of FIG. If it is photocurable, it is polymerized and cured using a light irradiation chip. Subsequently, a pre-made post 5 formed in advance so as to fit the photocurable resin hole 12 is inserted and fixed with an adhesive 9. This state is shown in FIG.

  The pre-made post 5 is made in advance (slightly smaller) in the same shape as the light irradiation chip 6 with a metal, a resin, or the like. FIG. 11 shows the state of the ready-made post 5 as a single unit. This ready-made post 5 is formed in a shape that matches the shape of the light irradiation chip 6 and is slightly smaller than the light irradiation chip 6. Conversely, the light irradiation tip 6 may be formed along this shape as long as the pre-made post 5 is predetermined. The ready-made post 5 may be another hard molded product or a machined one.

  After inserting this ready-made post 5, the photocurable resin 4 is built up with a syringe 11 or the like so as to cover all. After building up, the surface of the photocurable resin 4 is again irradiated with light and photopolymerized. This state is shown in FIG. Since this cured state is in an uneven state, the surface of the photocurable resin 4 built up at the diamond points 13 so as to be in the shape of an abutment tooth is formed in the shape of an abutment tooth. FIG. 10 shows this state.

  Basically, treatment for abutment tooth formation is performed in this way. Since the shape of the teeth differs depending on the part and the shape of the defect also differs, the light irradiation tip 6 and the existing post 5 are not limited to the shapes of the illustrated configurations. FIG. 12 shows a case where the cavity is large when applied to the molar tooth 14. FIG. 12 shows a state corresponding to FIG. 3, but the light irradiation chip 15 used in the subsequent process has a shape as shown in FIG. 13, and the molar teeth are different from the narrow shape as described above. The light irradiation chip 15 has a flat shape according to the 14 cavities 16.

  In this case as well, although the subsequent steps are not shown, the light irradiation chip 15 is inserted into the filled photocurable resin 4 and light polymerization is performed from the inside for photopolymerization. After the light irradiation tip 15 is pulled out, a pre-formed post formed in accordance with a light irradiation post (not shown) is inserted and bonded in the same manner as described above, and the photocurable resin 4 is filled again to repair the molar tooth 14.

  Moreover, FIG. 14 is an example applied when the tooth 2 is missing due to caries. The figure shows a repaired state when a part of the tooth 2 is missing, but the light-curing resin 4 is bonded to the missing surface 2a of the tooth 2 so as to rise, and light is transmitted along the missing surface 2a as described above. The irradiation chip 6 is inserted into the photocurable resin 4 and photopolymerized from the inside.

  Although not shown, after the light irradiation chip 6 is pulled out, a pre-made post that fits into the hole is inserted and bonded, and if necessary, the photocurable resin 4 is further filled and photopolymerized to form and repair it with diamond points or the like. . In this case, if the photocurable resin hole after removing the light irradiation chip 6 is small and shallow, a treatment method may be used in which the low viscosity photocurable resin 4 is filled again instead of the existing post.

  In any case, when the cavity has a complicated shape, the light irradiation tip and the existing post are formed according to the shape. Usually, there are many tapered conical shapes, but they may be elliptical or cylindrical, and may be rectangular or deformed.

  FIG. 15 is a special example of the ready-made post 17. Use this when you want to correct the direction of tooth implantation for therapeutic reasons. The method of use is the same as described above, and is effective in securing the hardness of the abutment tooth having poor conditions. The light generating element 21 is made of a known LED (light emitting diode). In general LEDs, a lens may be provided on the light emitting surface in order to give directionality to light emission. Since the light generated from the LED propagates only to a distance of about several millimeters, there may be no lens. Further, in order to irradiate the light generated from the LED to the surroundings temporarily, an optical mechanism may be provided so that the emitted light is temporarily dispersed.

  16 and 17 illustrate another example of the light irradiation chip. This is an example in which the number of light generating elements 21 incorporated in the light irradiation chip is changed depending on the size of the core cavity 3 provided in the tooth 2 to be repaired. The light irradiation chip 23 in FIG. 16 has one light generating element, and the light irradiation chip 25 in FIG. 17 has two light generating elements.

As described above, the restoration of the tooth has two steps of filling the photocurable resin, and using the light irradiation tip of the present invention, the adhesion to the cavity is surely performed by the strong photopolymerization in the first step. After the photocurable resin is filled, the photopolymerization is performed again by ordinary light irradiation, and it is finished by cutting in the final process.
Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment.

  In the embodiment of the present invention, in the method for constructing the abutment of the tooth 2 to be repaired, it is applied in the core cavity 3 using the adhesive 9 (see FIG. 4). When the photocurable resin 4 has adhesiveness, it is not necessary to use the adhesive 9, and the photocurable resin 4 is filled into the core cavity 3 with a syringe 11 or the like. And the light irradiation chip | tip 6 is inserted in the photocurable resin 4, and it irradiates and photopolymerizes.

FIG. 1 is a sectional view showing a tooth 1 of a resin core abutment tooth treated by applying a light irradiation chip for dental restoration of the present invention. FIG. 2 is a conceptual diagram showing a light irradiation chip having a light generating element. FIG. 3 is a cross-sectional view showing a process of forming a core cavity in a tooth. FIG. 4 is a cross-sectional view showing a process of applying an adhesive into the formed core cavity and polymerizing and curing it. FIG. 5 is a cross-sectional view showing a step of injecting a photocurable resin into the core cavity using a syringe. FIG. 6 is a cross-sectional view showing a step of inserting the light irradiation chip into the photocurable resin immediately after filling the photocurable resin. FIG. 7 is a cross-sectional view showing a process of applying an adhesive after the light-irradiated chip is removed from the photocurable resin. FIG. 8 is a cross-sectional view showing a process of inserting and bonding a pre-made post into a photocurable resin hole. FIG. 9 is a cross-sectional view showing a process of building a photocurable resin with a syringe again so as to cover all after post insertion. FIG. 10 is a cross-sectional view showing a process of making a photocurable resin built with diamond points into an abutment tooth shape. FIG. 11 is an external view of a ready-made post. FIG. 12 is a cross-sectional view showing a process of forming a deep and large core cavity such as a molar part. FIG. 13 is an external view of a light irradiation chip applied to FIG. FIG. 14 is a cross-sectional view showing a process of inserting a light irradiation chip applied to a tooth missing with a decayed tooth into a photocurable resin. FIG. 15 is an external view showing a special form of an existing post. FIG. 16 is a conceptual diagram showing another example of the light irradiation chip. FIG. 17 is a conceptual diagram showing another example of the light irradiation chip. FIG. 18 is an external view of a control panel of a power supply device for supplying power to the light irradiation chip. FIG. 19 is a conceptual diagram of the inside of the power supply device for supplying power to the light irradiation chip and the electric circuit of the light irradiation chip.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Teeth after abutment tooth formation 2 ... Restoration tooth 3 ... Core cavity 4 ... Photocurable resin 5 ... Pre-made post 6 ... Light irradiation tip 9 ... Adhesive

Claims (5)

In a light irradiation device for dental restoration that polymerizes and cures a photocurable resin for dental treatment by irradiating light,
The dental restorative light irradiation device comprises a light irradiation chip containing one or more light generating elements for generating the light,
The light irradiation tip is formed in a shape along a cavity of a tooth, inserted into the photocurable resin filled in the cavity, and configured to be extracted after photopolymerization. Light irradiation device for dental restoration. In claim 1,
The light irradiation tip is a pointed member with a thin tip. A light irradiation device for dental restoration, wherein: In claim 1 or 2,
The said light irradiation chip | tip is comprised by the non-adhesive member which does not adhere to the said photocurable resin. The light irradiation apparatus for dental restorations characterized by the above-mentioned. In one selected from claims 1 to 3,
The said light irradiation chip | tip is along the post | mailbox shape inserted in the said photocurable resin with which the said cavity was filled. The light irradiation apparatus for dental restoration characterized by the above-mentioned. In claim 1,
The light irradiation device for dental restoration has a power supply unit for supplying power to the light generating element,
The said power supply part is connected to the said chip | tip for light irradiation with the electric wire through the connector which can be attached or detached. The light irradiation apparatus for dental restorations characterized by the above-mentioned.

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