JP5116400B2 - Colored abutment building former - Google Patents

Description

  The present invention relates to a former for building an abutment that is used when an abutment is constructed using a photocurable resin for constructing an abutment.

  Conventionally, when fixing a dental prosthesis to a remaining tooth, if the remaining tooth remains in a substantially perfect shape, the operator cuts it into a shape approximating a frustoconical shape with a turbine or the like, and serves as an abutment. I use it. On the other hand, when the remaining tooth is only the root portion, in order to use it as a support as described above, a metal post made of a metal material or a fiber post (resin impregnated with resin) Planting a dental post such as a glass fiber), and then building an abutment-building resin on the occlusal surface side of the root of the tooth post in a shape approximating a truncated cone shape and curing it It is common to build an abutment. Here, as the resin for building an abutment, a photocurable resin containing a photopolymerization initiator is generally used because of good operability. Further, as the photopolymerization initiator, In consideration of its use in the body, not ultraviolet light or the like that may cause harm to the living body, but usually one whose polymerization is initiated by light in the visible light region is used.

  By the way, in the construction method of the above-mentioned abutment, the reason why the photocurable resin for abutment construction is built up in a shape that approximates the truncated cone shape is that when attaching a dental prosthesis from the occlusal surface side. This is because it is easy to operate and adapt. In order to build the photocurable resin for building an abutment into the truncated cone shape, it must be filled directly from the syringe and then shaped by hand tools. Since the photo-setting resin for building a table is easily deformed, it has to be built up little by little and hardened each time, and the work must be advanced.

  Under these circumstances, a method for building an abutment is proposed, which uses an abutment-building former made up of a synthetic resin cup with a shape that approximately matches the shape of the abutment to be built (a shape that approximates a truncated cone shape). (Patent Document 1). That is, in this method, as shown in FIG. 3, the abutment building photocurable resin 2 is injected into the inner space of the abutment building former 1, and in this state, the abutment is to be built. It is a method of building the abutment by covering the remaining teeth 3 from the occlusal surface side and curing the injected photocurable resin 2 by irradiating visible light from above the cup. Therefore, it is possible to reliably manufacture the abutment having the desired shape, which is very excellent.

  This abutment building former is similar in shape to the frustoconical shape as described above, but this shape is not limited to one, but it is subtle to correspond to various forms of teeth. Usually, multiple types with different shapes are prepared and set.

JP 2003-305059 A

  Depending on the form of the above teeth, the abutment building former used as a set of different types of shapes, the difference in shape between each other is a slight difference, just by looking at this at a glance It is difficult to take out what is present. For this reason, normally, a part of the former for building an abutment is given a number so that it can be distinguished. However, this also requires careful selection of individual formers, which puts a lot of stress on the surgeon in the abutment-building clinic that requires precise and neat operation.

  Therefore, it has been strongly desired to develop an abutment building former that can easily identify and take out a desired shape according to the shape of a tooth to be treated.

  As a result of diligent research to solve the above-mentioned problems, the present inventors have colored the abutment-building former into a specific color according to the shape, and this color is injected into the inner space. The inventors have found that the above-mentioned problems can be solved by devising a color that does not hinder the photo-curing reaction of the photo-curable resin for building a table, and have completed the present invention.

That is, the present invention is used when a support for fixing a dental prosthesis to a remaining tooth is constructed using a visible light curable resin for building an abutment containing camphorquinone as a photopolymerization initiator. The abutment-building former comprising a synthetic resin cup having a shape substantially matching the shape of the abutment, and colored to facilitate selection from other abutment-building formers of different shapes The coloring is performed with a color having no maximum absorption wavelength at ± 100 nm of 470 nm, which is the excitation wavelength of the camphorquinone, and the light transmittance of light having the wavelength of 470 nm is 70% or more. It is a former for building an abutment characterized by being.

  Furthermore, the present invention also provides the above-mentioned abutment building former, which is a set of abutment building formers in which a plurality of different colors are stored depending on the shape.

  Since the abutment building former of the present invention is colored in a unique color according to its shape, it can be easily distinguished from a different shape, and has an optimum shape according to the shape of the tooth to be treated. Can be easily taken out. Moreover, even though it is colored in this way, the color is devised to a color that does not interfere with the photocuring reaction of the photocurable resin for abutment construction to be injected into the inner space, so that the photocuring Sex resin cures well.

  Therefore, according to the former for building an abutment according to the present invention, when the abutment is built using the photocurable resin for building an abutment, an accurate and neat operation can be performed, and the burden on both the patient and the operator can be reduced. Very useful.

  In the present invention, the former for building an abutment is an abutment for fixing a crown prosthesis such as a crown or a bridge to a remaining tooth. This is a member made of a synthetic resin cup having a shape substantially matching the shape of the abutment, which is used when building with a photocurable resin. The shape substantially matching the shape of the abutment is usually a shape that approximates a truncated cone shape. The wall thickness of the synthetic resin cup forming the former is usually 0.05 to 2 mm.

  Here, the synthetic resin forming the synthetic resin cup is not particularly limited, and a known resin can be adopted, but a resin having good transparency is preferable. For example, an olefin polymer such as polyethylene, polypropylene, polybutylene, and a copolymer thereof, an acrylic polymer such as poly (meth) acrylic acid represented by polymethyl methacrylate, and a copolymer thereof, polystyrene, poly ( Acrylonitrile-styrene), poly (butadiene-styrene), styrene polymers such as ABS polymer, vinyl polymers such as polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polychlorinated vinyl chloride, and copolymers thereof, nylon 6 , Nylon 66, Nylon 610, Nylon 612, Nylon 11, Nylon 12, Nylon 46, and other amide polymers, unsaturated polyester resins such as polyethylene terephthalate, dimethyl terephthalate, 1,4-butanediol, poly (oxytetramethyl) Len) glycol as a raw material, fluoroelastomers such as thermoplastic elastomers, polytetrafluoroethylene, polytrifluoroethylene, and polyvinylidene fluoride produced by transesterification and polycondensation reactions and their copolymers, other polycarbonates, polyacetals, poly Ethersulfone, polyphenylene oxide, polyphenylene sulfide, polysulfone and copolymers thereof can be preferably used. These are preferably called flexible elastomers.

  Among them, the olefin polymer or the copolymer thereof is particularly preferable because it is optimal for the use of the present invention in terms of safety to the living body, transparency of the material, and flexibility.

  As for the shape of the synthetic resin cup, there are a large number of slightly different shapes depending on the shape of the tooth to be treated. For example, if it is a former for medium incisors, side incisors, and canines, it has the shape shown in the sectional view of FIG. 1, and if it is a former for premolars and molars, it is as shown in the sectional view of FIG. Shape. These are generally treated as a set by combining several types of different shapes according to the shape of the tooth used.

  The shape is not particularly limited. For example, in the case of the shaper shown in FIG. 2, there is a shape having a taper at a portion in contact with the gingiva and a gripping portion at the center of the occlusal surface. preferable.

  In the present invention, this abutment-building former is colored in a unique color according to its shape. Therefore, even when a plurality of different shapes are mixed, such as when the above several types are combined, it is possible to easily identify and take out the desired shape for more reliable abutment construction. Can contribute. In addition, when the abutment building former is used as a set, it can be distinguished if other abutment building formers are colored, and one of them can be uncolored.

  The greatest feature of the present invention is that the former is colored so that the light transmittance of the light having the excitation wavelength of the photopolymerization initiator contained in the photocurable resin for building an abutment is 30% or more. In the point. That is, when the abutment-building former is colored so that it can be distinguished visually, it usually has absorption in the visible light region, and the light beam corresponding to the excitation wavelength of the photopolymerization initiator contained in the photocurable resin. Will also absorb. In this case, the photopolymerization of the photocurable resin for building an abutment is greatly hindered.

  On the other hand, the former of the present invention is colored with a color in which the absorption of the light with the excitation wavelength of the photopolymerization initiator is suppressed as described above, and therefore, the light for building the abutment is formed in the inner space. When a curable resin is injected and this is applied to the remaining teeth to form the abutment and irradiated with light, the light having the excitation wavelength of the photopolymerization initiator can be transmitted through the former satisfactorily. As a result, the light beam sufficiently reaches the photocurable resin for building an abutment, the photocuring reaction proceeds actively without hindering, and a high-strength abutment is built.

  In the present invention, the light having the excitation wavelength of the photopolymerization initiator contained in the photocurable resin for building an abutment is the maximum in the visible light absorption spectrum of the photopolymerization initiator component that absorbs and excites light. A light beam having a wavelength having absorption. If a plurality of components that absorb and excite light are mixed, the mixture has a wavelength that maximizes absorption. The excitation wavelength of such a photopolymerization initiator may be determined by dissolving the photopolymerization initiator in an organic solvent such as acetonitrile or ethanol to prepare a solution and measuring it with a visible ultraviolet spectroscopic hardness meter.

In addition, the light transmittance of the light having the excitation wavelength of the photopolymerization initiator is the difference between the amount of incident light and the amount of light that has passed through the test piece. The ratio is expressed as a percentage, and is generally a value measured by a visible ultraviolet spectrophotometer or the like. In the present invention, the light transmittance of light having an excitation wavelength of the photopolymerization initiator needs to be 70% or more.

In the photocurable resin for building an abutment, the photopolymerization initiator contained is mostly composed mainly of camphorquinone having an excitation wavelength of 470 nm. That is, the above camphorquinone is used alone, or combined with a photopolymerization polymerization accelerator such as tertiary amine as a reducing agent, and further combined with an auxiliary accelerator such as triazine compound or iodonium salt. Often used . The former for building an abutment according to the present invention is used when building with a visible light curable resin for building an abutment containing camphorquinone as such a photopolymerization initiator. Therefore, the above-mentioned photopolymerization initiator is used. The requirement of the light transmittance of the light having the excitation wavelength is that the light transmittance of the light having a wavelength of 470 nm is 70 % or more.

  In addition, the photocurable resin for building an abutment used in the present invention is preferably a dual cure type by further blending a chemical polymerization initiator represented by a combination of an organic peroxide and an amine. It is possible to adopt.

In addition to the requirement that the light transmittance at 470 nm, which is the excitation wavelength of the camphorquinone, is 70 % or more, the coloring of the former for building abutment is a color in which there is no maximum absorption wavelength at ± 100 nm of the 470 nm. It is necessary . That is, in the color having the maximum absorption wavelength in the vicinity of the wavelength region described above specific excitation wavelength of the camphor quinone, in order to suppress the as the absorption rate of light of the excitation wavelength of the camphor quinone invention defined in this ray of the maximum absorption wavelength also it is difficult to satisfy if kept to a correspondingly low absorption, in this case, the coloring of the former becomes pale, Ru danger that sorting of the former is decreased.

When the photopolymerization initiator contains the above-described camphorquinone as a main component, the coloring is achieved by, for example, coloring the blue having a maximum absorption wavelength around 625 nm, blue-green around 650 nm, or the like to realize the present invention. It is practical. Further, the coloring of the former for building an abutment is preferable because a ^* and b ^* measured based on JIS Z 8729 can be clearly identified visually when the following formula is satisfied.
c ^* = (a ^{* 2} + b ^{* 2} ) ^1/2 > 2 (more preferably> 10) (1)
Here, a ^* and b ^* are called chromaticness indices, and are coordinates in a three-dimensional color space having a visually uniform rate, where a ^* indicates reddishness and b ^* indicates yellowishness, respectively. . When the value of a ^* increases, the redness increases, and when the value becomes negative, the greenness increases. When the value of b ^* increases, yellowishness increases, and when the value becomes negative, blueness increases. Accordingly, the color depth depends on the values of a ^* and b ^* , and the higher the c ^* (saturation) represented by the following formula, the darker the color.

  In addition, although the coloring of the former for building an abutment does not necessarily have to be performed on the entire former, it is preferable that 50% or more of the surface area is colored for ease of visual recognition, and further 80%. It is more preferable that the above is colored.

  In the present invention, the former may be colored with a colorant called a pigment or a dye. Among these, it is preferable to use a pigment from the viewpoint of color tone stability.

The pigment used is used alone or in combination of two or more in order to adjust the color satisfying the requirements specified in the present invention in relation to the camphorquinone contained in the photocurable resin for building an abutment used. do it. Specifically, azo pigments such as monoazo lakes, monoazos, disazos, condensed azos, metal complex azos, phthalocyanines such as copper phthalocyanine blue, copper phthalocyanine green, brominated copper phthalocyanine green, acid dye lakes, dye with pigments such as basic dye lake, anthraquinone, thioindigo, perinone, perylene, quinacridone, dioxazine, key Nofutaron, isoindoline, condensed polycyclic pigments pyrrole etc., benzimidate the pyrazolone-based pigments, metal complex salt azomethine, organic pigments such as aniline black, daylight fluorescent pigments, titanium oxide, zinc sulfide, zinc oxide, barium sulfate, ultramarine, bismuth vanadate, cerium oxide, cobalt blue, the present invention from the inorganic pigments such as carbon black defined What satisfies the requirements may be selected as appropriate.

  Moreover, what is necessary is just to determine arbitrarily the compounding quantity of these pigments by the quantity which satisfies the said requirements of this invention.

  The production method of the former for building an abutment of the present invention is not particularly limited, and any known resin molding method can be employed without any limitation. For example, injection molding or cutting out is suitable. Among these, injection molding is particularly preferable from the viewpoints of molding accuracy and speed.

  The method for using the former for building an abutment of the present invention will be described with reference to FIGS. The remaining teeth 3 for which the abutment is built on the occlusal surface side are enlarged in the root canal as shown in FIG. 4 when there is a portion that can be a part of the abutment on the occlusal surface side. In some cases, it consists only of the root.

  In order to build an abutment on the occlusal surface side of the remaining tooth 3 using the abutment building former of the present invention, first, the shape of the tooth is set so that the end edge of the synthetic resin cup is close to the gingiva near the abutment tooth. Select a suitable abutment building former according to the color of the former. The selected abutment building former is preferably trimmed in accordance with the height of the abutment formed in advance if necessary.

  Next, when the remaining tooth 3 has a portion that can become a part of the abutment on the occlusal surface side as shown in FIG. 3, the abutment-building photocurable resin 2 is injected into the abutment-building former 1. After that, it is positioned and pressed so as to cover the shape part approximate to the abutment of the remaining teeth 3 to be built from the occlusal surface side. When excess photocurable resin 2 for building an abutment flows out from the margin, after the resin 2 that has flowed out is wiped off, light is irradiated from above the abutment building former 1 to build an abutment in the cup. The photocurable resin 2 is photocured.

  After the abutment building photocurable resin 2 is cured in this manner, the abutment building former 1 is peeled from the cured product of the abutment building photocurable resin 2. Thereafter, the abutment construction can be completed by adjusting the shape of the photocurable resin 1 for abutment construction using a cutting tool such as a diamond point, if necessary.

  On the other hand, if the remaining tooth 3 is composed only of the root of the root canal as shown in FIG. 4, the abutment may be formed as follows. That is, the abutment-building photocurable resin 2 is injected and filled into the root canal of the remaining teeth 3, and the post 7 is injected and filled into the root canal forming portion as necessary. After being inserted into 2 and temporarily fixed, the abutment-building former 1 in which the abutment-building photocurable resin 2 is injected into the inner space is pressed so as to cover the remaining teeth 3 from the occlusal surface side. Then, the abutment-building photocurable resin 2 in the abutment-building former 1 may be photocured in the same manner as described above and subjected to the same post-treatment.

  In these abutment constructions, when the abutment construction photocurable resin 2 in the abutment construction former 1 is photocured, the abutment construction former 1 is moved from a predetermined position until the curing is completed. It is preferable to fix firmly so as not to move. For this purpose, as shown in FIG. 4, it is effective to project the grip portion 4 at a predetermined position on the bottom surface of the cup of the abutment building former 1. The gripping portion 4 is gripped by a gripping rod 6 or the like provided with an engagement recess 5 for engaging the gripping portion 4 by inserting the gripping portion 4 at the tip as shown in FIG. The remaining teeth 3 can be lightly pressed, and reliable fixing of the abutment building former 1 is facilitated. Of course, in the case where such a gripping portion 4 is not formed on the bottom surface of the cup like the abutment building former 1 shown in FIG. 3, the bottom surface of the cup is used for hands such as hands with dental gloves or tweezers. What is necessary is just to lightly harden | cure by pressing the abutment building former 1 against the remaining teeth 3 by pressing with a tool or the like.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to the examples. The physical property values were measured according to the following methods.
[Visible spectrum]
The absorption spectrum in the visible region is measured using a visible ultraviolet measuring device (manufactured by Hitachi Keiki Service Co., Ltd .; U-3210). The measured value when no sample is placed is taken as 100%, and the sample former is selected. The light transmittance at each wavelength was measured for the flat part of the material cut open at. The light source was D2, and the range from 380 nm to 800 nm was scanned at a rate of 600 nm per minute.
[Former color tone]
For the color tone of the former, a ^* and b ^* were measured by the following method. That is, a ^* and b ^* were measured in accordance with JIS Z 8729 using a color difference meter (TC-1800MKII, manufactured by Tokyo Denshoku Co., Ltd.) with a white background as the background for the flat part of the sample former that had been cut open with a scissors. .
[Curing depth]
The photocurable resin for building an abutment was inserted into a stainless steel split mold having a hole with a diameter of 4 mm and pressed with a polypropylene film. Next, a part of the flat part of the former for building the abutment is partially cut on the pressure contact surface, and the tip of the visible light irradiator Tokso Power Light (trade name, manufactured by Tokuyama Dental Co., Ltd.) is fixed on the surface. Light irradiation was performed for 2 seconds. After irradiation, the sample was removed from the split mold and the unpolymerized portion was removed. Next, the length of the cylindrical polymer cured product was read with a micrometer to determine the curing depth.

Moreover, the raw material of the photocurable resin for abutment construction used in the Example and the comparative example is as follows.
<Former ingredients>
(A) Thermoplastic resin olefin-based elastomer (manufactured by Riken, LFR9676L)
(B) Pigment Chrophtal Blue A3 (Anthraquinone)
Chromophthal Red BG (Condensed Azo)
Chromophthal Yellow 3G (Condensed Azo)
Chromophthal Orange 2G (isoindolinone)
Cyanine green 5390 (copper phthalocyanine green)
<Raw material for composite resin>
(A) Polymerizable monomer 2,2-bis [4 (2-hydroxy-3-methacryloxypropoxy) phenyl] propane (hereinafter abbreviated as Bis-GMA)
Triethylene glycol dimethacrylate (hereinafter abbreviated as 3G)
(B) Inorganic filler amorphous silica-zirconia, γ-methacryloxypropyltrimethoxysilane surface-treated product, average particle size: 4.2 μm (hereinafter abbreviated as b-1)
Spherical silica-zirconia, average particle size: 0.1 μm (hereinafter abbreviated as b-2).
(C) Photopolymerization initiator camphorquinone (excitation wavelength: 470 nm, hereinafter abbreviated as CQ)
2,4,6-Trimethylbenzoyl-diphenyl-phosphine oxide (excitation wavelength: 390 nm, hereinafter abbreviated as TPO)
Photopolymerization accelerator ethyl 4-dimethylaminobenzoate (hereinafter abbreviated as DMBE)
Example 1
(B-1) 53 parts by mass as inorganic filler, (b-2) 23 parts by mass, (a) Bis-GMA 14 parts by mass and 3G 10 parts by mass as a polymerizable monomer, (c) light CQ 0.1 mass part and DMBE 0.1 mass part were mixed as a polymerization initiator, and photocurable resin CR-1 for abutment construction was produced.

  Using LFR9676L manufactured by Riken as an olefin elastomer, a blue colored former (cup wall thickness 0.5 mm) was prepared by blending 50 ppm of Cromophtal Blue A33 (anthraquinone). By distinguishing the blue color of this former, it was easy to adopt even if it was mixed with a different-shaped former colored in another color.

When the absorption spectrum in the visible region was measured, it had a maximum absorption wavelength at 625 nm. The light transmittance at 470 nm was 90%. The depth of cure was measured when the former was cured with visible light transmitted through the former. Example 2 in which the curing depth was 6.2 mm , Comparative Examples 1 and 2
Using CR-1 produced in Example 1, LFR9676L manufactured by Riken Co., Ltd. was used as the olefin-based elastomer, and respective formers containing 50 ppm of the pigments shown in Table 1 were produced.

When the same measurement as in the example was performed, a value of 5 mm or more in the curing depth was obtained.
Comparative Example 3
(B-1) 53 parts by mass as inorganic filler, (b-2) 23 parts by mass, (a) Bis-GMA 14 parts by mass and 3G 10 parts by mass as a polymerizable monomer, (c) light CR-2 was produced by mixing 0.1 part by mass of TPO and 0.1 part by mass of DMBE as a polymerization initiator.

  Using LFR9676L made by Riken as an olefin elastomer, a former colored in orange was prepared by blending 50 ppm of Cromophtal Orange 2G (isoindolinone).

The curing depth was measured when cured by visible light passing through a former for building an abutment having an orange color. The curing depth was 5.5 mm.
Comparative Example 4
The CR-1 produced in Example 1 was used to measure the depth of cure when cured by visible light transmitted through the abutment building former having the orange color tone produced in Comparative Example 3 . The curing depth was 3.0 mm, and compared with Examples 1 and 2 , the effect on the photocurability of the resin for building an abutment included was very large.
Comparative Example 5
Using CR-2 produced in Comparative Example 3 , 25 ppm each of Cromophtal Yellow 3G (condensed azo type) and Cromophtal Blue A33 (anthraquinone type) were blended into LFR9676L made by Riken as an olefin elastomer to give a yellowish green color tone. A former for building an abutment was prepared. The curing depth when cured by visible light transmitted through the former was measured. The curing depth was 2.0 mm, and compared with Comparative Example 3 , the effect on the photocurability of the resin for building an abutment included was very large.

FIG. 1 is a cross-sectional view showing a typical embodiment of an abutment building former for medium incisors, side incisors, and canines. FIG. 2 is a cross-sectional view showing a typical embodiment of an abutment-building former for premolars and molars. FIG. 3 is a diagram illustrating a method of using the abutment building former, and is the above method when the remaining teeth have a portion that can become a part of the abutment on the occlusal surface side. FIG. 4 is a diagram showing another method of using the abutment building former, which is the method described above when the remaining teeth are composed only of the root of the root canal. FIG. 5 is a schematic view showing a gripping rod used to fix the abutment building former.

Explanation of symbols

1: Abutment building former 2: Photocurable resin for building abutment 3: Residual teeth 4: Gripping part 5: Engaging recess 6: Gripping bar 7: Post

Claims (2)

The shape of the abutment used when the abutment for fixing the dental prosthesis to the remaining tooth is constructed using a visible light curable resin for abutment construction containing camphorquinone as a photopolymerization initiator. Is a former for building an abutment made of a synthetic resin cup having a shape substantially conforming to the above , and is colored to facilitate selection from other abutment building formers of different shapes , The excitation wavelength of camphorquinone is made in a color having no maximum absorption wavelength at ± 100 nm of 470 nm, and the light transmittance of light having the wavelength of 470 nm is 70% or more. Former building former. The former for building an abutment according to claim 1, wherein a plurality of different colors are stored depending on the shape.

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