KR101974519B1 - Photo-polymerized Dental restoration material composition and production mehtod thereof - Google Patents

Abstract

The present invention relates to a photopolymerizable dental restorative composition and a process for its preparation.
The photopolymerizable dental restoration composition of the present invention comprises a composite resin base composed of a methyl methacrylate (MMA) monomer and a polymerization initiator for initiating polymerization of the monomer, a transparency adjusting agent having the same refractive index as the composite resin base, And reinforcing inorganic filler.
According to the present invention, it is possible to realize a transparent color of the cervical region by exhibiting high light transmittance compared to a conventional dental restoration composition, thereby naturally assuring esthetics of various tooth parts and improving the refractive index and depth of polymerization. A photopolymerizable dental restoration composition excellent in operability and a method of manufacturing the same are provided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental restorative composition,

More particularly, the present invention relates to a photopolymerizable dental restoration composition and a method of preparing the same. More specifically, the present invention relates to a photopolymerizable dental restoration composition and a method of preparing the same. The present invention also relates to a photopolymerizable dental restoration composition having excellent operability and a method for producing the same.

Dental restorative composition refers to those used for the purpose of treating and preventing dental burrs, such as fillings restored by filling the cavity of a dental caries.

Dental restorative compositions include gold, amalgam, a composite containing mercury, and composite resins.

The gold is not discolored over time, but has a high strength, and is a good restoration material. However, it has a disadvantage in that the cost is high and the esthetics are not high due to the inherent color of the gold itself.

Amalgam is the oldest dental restorative material and has been used continuously since its economic and convenient use. However, the problem of secondary caries inducing discoloration and corrosion over time and not sticking to hemorrhoids The research on the polymer dental restorative composition that can gradually replace it has been carried out variously.

The composite resin is a polymer-based restoration material such as a reinforcing plastic, and may be generally composed of an organic matrix and a filler. Here, the organic substrate means that the additive material capable of imparting a shape similar to a tooth can be mixed. By mixing the filler material, it is possible to form a material enhancing the durability of the composite resin. In addition, the composite resin is a restorative material that can enhance the aesthetics because it can realize the color of natural teeth by adding various kinds of hues. Recently, it has been most widely used in the field of preservative restoration.

Polymerization is called polymerization in which the composite resin is filled in a site where a tooth is required to be restored and hardened. The composite resin can be classified into a photopolymerizable type, an autopolymerizable type, and a bi-polar type depending on the polymerization method.

Among them, the photopolymerizable type composite resin means that the photopolymerizable type composite resin is filled in a site where repair is required and then light is irradiated to the photopolymerizable type composite resin by using a photopolymerization machine to cause the photopolymerization reaction to occur and harden in a short time. It is widely used.

The light curing unit used in the use of the light-cured composite resin is a device capable of using blue light having a wavelength of 450 nm to 500 nm. The curing depth at which the light of the light curing unit reaches the polymerization curing unit of the light- (hereinafter, referred to as " photopolymerization type dental restoration composition " in the present invention) in a case where the restoration range is a maximum of 4 mm, such as a tooth cavity, Quot;) is filled in a small amount and several times.

There have been many studies to improve this, and related known technologies include Korean Patent No. 10-1517628 (materials for inducing improved dental composite materials and composite materials produced therefrom) and Korean Patent Laid- -2015-0108010 (light-curing dental restoration composition) and the like are known

However, although Korean Patent No. 10-1517628 improves the physical properties of existing dental composite materials, it still has a low transparency, and it is troublesome to fill it by a lamination method. In Korean Patent Laid-Open No. 10-2015-0108010 However, it is disadvantageous to separately use the material of the nano-optical fiber so that the light of the light-curing machine can reach the light-curing dental restoration composition.

It is an object of the present invention to provide a dental restorative composition which has high light transmittance compared to existing dental restorative compositions and can realize transparent color of the cervical portion, And at the same time, the refractive index and the depth of polymerization can be improved, so that the photopolymerization reaction can be performed by injecting the dentin into the cavity of the tooth at once, thereby providing a photopolymerizable dental restoration composition having excellent operability and a method of manufacturing the same.

In order to achieve the above object, the present invention provides a photopolymerizable dental restoration composition comprising a composite resin base composed of a methyl methacrylate (MMA) monomer and a polymerization initiator for initiating polymerization of the monomer, And an inorganic filler for reinforcing the strength.

The composite resin base includes 95 to 98.7% by weight of the methyl methacrylate (MMA) based monomer based on the total weight of the composite resin base, and the methyl methacrylate (MMA) based monomer is 2,2 (Bis-GMA), triethyleneglycol dimethacrylate (TEGDMA) and urethane dimethacrylate (UDMA), which is a mixture of bis [4- (2-hydroxy-3- methacryloxypropoxy) phenyl] propane , The polymerization initiator is at least one selected from the group consisting of camphorquinone (CQ), 4- (dimethylamino) ethylbenzoate (4-EDAB), 2,6-di- And 4-methoxybenzophenone (BP).

Also, the transparency adjusting agent is Ba-glass having a particle size of 1 탆, and the inorganic filler is selected from the group consisting of silicon dioxide, nano zirconia filler, synthetic (synthetic) amorphous silica).

The composition of the present invention is characterized in that the composite resin base is 33 to 35% by weight, the transparency adjusting agent is 62 to 64% by weight, and the remaining inorganic fillers are used.

Another method for producing a photopolymerizable dental restoration composition according to the present invention comprises mixing a methyl methacrylate (MMA) monomer and a polymerization initiator for initiating polymerization of the monomer at 80 to 120 rpm for 1 to 2 hours, A second step of measuring a refractive index of the composite resin base produced in the first step, and a step of selecting a transparency adjusting agent having the same refractive index as the refractive index of the composite resin base measured in the second step The transparent regulator and the inorganic filler for strength reinforcement selected in the third step are sequentially added to the composite resin base prepared in the third step and then stirred until completely melted to prepare a photopolymerizable dental restorative composition And a fourth step of fabricating the semiconductor device.

In the first step of preparing the composite resin base, the methyl methacrylate (MMA) -based monomer may be contained in an amount of 95 to 98.7% by weight based on the total weight of the composite resin base. The refractive index of the composite resin base measured in the step is 1.55.

In addition, the transparency adjusting agent selected in the third step is Ba-glass having a particle size of 1 탆, and the inorganic filler added in the fourth step is selected from the group consisting of silicon dioxide, nano- It is characterized by a mixture of nano zirconia filler and synthetic amorphous silica.

In the fourth step, the composite resin base is contained in an amount of 33 to 35 wt% based on the total weight of the composition, the transparency adjusting agent is contained in an amount of 62 to 64 wt%, and the remaining inorganic filler Feature.

The present invention is characterized by providing a photopolymerization type dental restoration composition prepared through the above-mentioned production method.

The photopolymerizable dental restoration composition according to the present invention exhibits high light transmittance as compared with conventional dental restoration composition, so that it is possible to realize a transparent cervical part color, so that aesthetics of various tooth parts naturally can be exhibited without additional coloring.

Also, since the refractive index and depth of polymerization are improved due to high light transmittance, the photopolymerization reaction can be performed by injecting the inside of the tooth cavity, which has a deep polymerization depth, by a single charging method instead of the lamination charging method.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process flow chart showing a method for producing a light-curing dental restoration composition according to an embodiment of the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, and a detailed description of known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted.

The present invention relates to a photopolymerizable dental restorative composition which undergoes a photopolymerization reaction by photopolymerization, wherein one aspect of the present invention relates to a composition comprising a methyl methacrylate (MMA) monomer and a polymerization initiator for initiating polymerization of the monomer A transparent base resin, a resin base, a transparency adjusting agent having the same refractive index as that of the composite resin base, and an inorganic filler for strength reinforcement.

Specifically, the photopolymerization reaction refers to a polymerization reaction that takes place by irradiation of light, and a conventionally known photopolymerizable dental restorative composition is a material that allows a tooth-like shape to be imparted It consists of an organic matrix with a composite resin and a filler that enhances durability. In addition, in order to enhance the aesthetics, various kinds of color tones are usually added to enhance the aesthetics of the natural tooth by increasing the content of the filler having small particles in order to increase the light transmittance. However, When the content is increased, the viscosity is increased and the operability is lowered, and the transparency is lowered due to a large amount of filler.

In addition, since the depth of polymerization for polymerizing the light-cured composite resin by reaching the light of the light curing unit is extremely limited, when the repair range is wide or wide, There are also disadvantages that can not be done.

Accordingly, the inventors of the present invention have conducted numerous studies to overcome the disadvantages of the conventional light-cured dental restoration composition. As a result, the light transmittance of the composition determines the degree of polymerization depending on the polymerization depth, In the present invention, it is considered to be the most important technique to increase the transparency so as to increase the light transmittance of the composition itself. After confirming the refractive index of the composite resin base, using the same transparency adjusting agent having the same refractive index, Type dental restorative composition. Therefore, it is possible to naturally assure the esthetics of various tooth parts without additional coloring, and at the same time, the refractive index and the depth of polymerization can be improved and the photopolymerization reaction can be performed by injecting the inside of the tooth cavity at once It is confirmed that the operability becomes easy.

Hereinafter, the role and content ratio of each component to the photopolymerizable dental restoration composition of the present invention will be described in detail.

1. Composite resin base

1) Methyl methacrylate (MMA) monomer

The methylmethacrylate (MMA) monomer is a dental material capable of exhibiting mechanical strength and capable of being polymerized, but is preferably 2,2-bis [4- (2-hydroxy-3-methacryl Butyloxypropoxy) phenyl] propane (Bis-GMA), triethylene glycol dimethacrylate (TEGDMA), urethane dimethacrylate (UDMA), and the like. May be used in the form of a mixture of two or more of them.

The composition and content of the MMA monomer are important factors for exhibiting the self-efficacy of the photopolymerizable dental restoration composition of the present invention.

Accordingly, the content of the MMA monomer is preferably 95 to 98.7% by weight based on the total weight of the composite resin base, and when it is less than 95% by weight, mixing with the polymerization initiator is not easy, If it is contained in an amount exceeding 98.7% by weight, the content of the following polymerization initiator is relatively decreased, and the photopolymerization reaction itself may become insufficient.

In one preferred example, the MMA-based monomer in the photopolymerizable dental restorative composition of the present invention is blended in a weight ratio of Bis-GMA: UDMA: TEGDMA = 1: 1: 1 in consideration of the desired mechanical properties, It is best to use an MMA-based monomer.

2) Polymerization initiator

The polymerization initiator is a material capable of forming a free radical in the activation so that a chain photopolymerization reaction can take place in the MMA monomer. The polymerization initiator is not particularly limited as long as it can induce photopolymerization. Preferably, the polymerization initiator is a camphorquinone (CQ) , 4-ethylbenzoate (4-EDAB), 2,6-di-tert-butyl-4-methylphenol (BHT), 2-hydroxy-4-methoxybenzophenone But are not limited to these, and may be used in the form of a mixture of two or more thereof in some cases.

The content of the polymerization initiator may be included in the composite resin base within a range that does not affect the physical properties of the final composition, that is, a photopolymerization catalyst amount, preferably 1.3 to 5 wt% based on the total weight of the composite resin base It is good to have.

If the content of the composite resin base is less than 33% by weight, the content of the composite resin base may be in the range of 33 to 35% by weight based on the total weight of the composition. It is difficult to use itself and mixing with the transparency adjusting agent and the inorganic filler is not easy. When the content is more than 35% by weight, the content of the following transparency adjusting agent and the inorganic filler is relatively small and the physical properties such as mechanical strength, It is difficult to obtain such a degree.

2. Transparency control agent

In order to increase the light transmittance, the present invention is limited to a separate transparency regulator among known materials known as inorganic fillers. As the transparent regulator, an inorganic filler material having the same refractive index as the composite resin base is used . In one preferred embodiment, the transparency modifier in the photopolymerizable dental restorative composition of the present invention is a barium-glass (barium-glass) having a particle size of 1 탆 having the same refractive index as the composition according to one embodiment of the present invention, .

Specifically, in general, a photopolymerizable dental restoration composition contains particles smaller than the wavelength of light in order to ensure transparency and aesthetics such as transparency and light, thereby realizing various tooth tone. As a practical example, barium-glass (Ba-glass) having a particle size of 0.7 μm has been usually used, but only a small amount of aesthetic property is secured only in a small amount of use. there was. In the present invention, when a material capable of achieving high light transmittance among the inorganic filler materials conventionally used is being sought, when an inorganic filler having the same refractive index as that of the composite resin base is used, high light transmittance is obtained And it is possible to realize the color of the transparent cervical portion.

That is, in the present invention, an inorganic filler having the same refractive index as that of the composite resin base is used so that esthetics of various tooth parts can be secured without restriction of the content of the inorganic material. Therefore, a large amount of inorganic filler can be used, .

Accordingly, the content of the transparency adjusting agent may be in the range of 62 to 64 wt% based on the total weight of the composition. If the content of the transparency adjusting agent is less than 62 wt%, the content may be too low to obtain transparency, It is difficult to expect a desired effect as a filling material. When the content exceeds 64% by weight, the content of the composite resin base is relatively decreased, and the function of the composite resin base is weakened. Thus, the use of the present invention as a desired dental restorative material It is preferable that the content of the transparency adjusting agent is in the range of 62 to 64% by weight based on the total weight of the composition in order to increase the light transmittance while maintaining the original function of the composite resin base Do.

3. Strengthening inorganic filler

The inorganic filler for reinforcing the strength is used for reinforcing the strength of the matrix composed of the composite resin base and the transparency adjusting agent and may be a commonly known material and is preferably silicon dioxide, Nano zirconia filler, synthetic amorphous silica, and the like. However, it is not limited to these, and in some cases, it may be used in the form of a mixture of two or more thereof.

The content of the inorganic filler for strength reinforcement may be included in the composition within a range that does not affect the physical properties of the composition, that is, a catalytic amount, preferably 1 to 5% by weight based on the total weight of the composition .

Hereinafter, the method for producing the photopolymerizable dental restoration composition of the present invention will be specifically described.

< Light-curing type  Dentistry Restoration material  &Lt; Preparation of composition &gt;

FIG. 1 is a flow chart showing a method of preparing a photopolymerizable dental restoration composition according to an embodiment of the present invention. The present invention includes both an organic matrix including a composite resin and a filler for enhancing durability A first step of preparing a composite resin base so as to enhance light transmittance through transparency unlike a conventional process of preparing a light-cured dental restoration composition which is mixed at once, a method of measuring the refractive index of the composite resin base produced in the first step A second step of selecting a transparency adjusting agent having the same refractive index as the refractive index of the composite resin base measured in the second step; And a fourth step of preparing a photopolymerizable dental restorative composition by adding and stirring an adjusting agent and an inorganic filler for strength reinforcement, It is characterized.

1) Step 1: Manufacture of composite resin base (S1)

In this step, a composite resin base is prepared by mixing a methyl methacrylate (MMA) based monomer and a polymerization initiator for initiating polymerization of the monomer, wherein the MMA based monomer is mixed with 95 to 98.7 wt% And is mixed at 80 to 120 rpm for 1 to 2 hours.

If the mixing speed is less than 80 rpm or the mixing time is less than 1 minute, sufficient mixing may not be performed, resulting in the materials not being mixed uniformly. If the mixing speed exceeds 120 rpm or the mixing time is 2 minutes , It is possible to increase the viscosity without further mixing effect.

2) Step 2: Measurement of refractive index of the composite resin base (S2)

In this step, the refractive index of the composite resin base prepared in the first step is measured, and it is an indispensable step that must be performed in order to have transparency of the entire composition.

As one of the most preferred examples, the MMA monomer in the composite resin base prepared in the first step is a mixture of Bis-GMA, UDMA and TEGDMA in a mixing ratio of 1: 1: 1, (CQ), 4- (dimethylamino) ethylbenzoate (4-EDAB), 2,6-di-tert-butyl-4-methylphenol (BHT) and 2-hydroxy-4-methoxybenzophenone (BP), the refractive index was measured and the refractive index of the measured composite resin base was found to be 1.55.

3) Step 3: Transparency control agent  Selection (S3)

In this step, for the purpose of improving the low light transmittance due to the use of a large amount of inorganic filler, which is a disadvantage of the conventional composition, and raising the esthetics and facilitating the operability, the refractive index is checked in the material of the inorganic filler which is conventionally used, The material of the inorganic filler having the same refractive index as the refractive index of the resin base is selected and applied as the transparency adjusting agent of the present invention.

In the second step, the material of the inorganic filler having a refractive index of 1.55 was confirmed in accordance with the refractive index of the composite resin base suggested as one of the most preferable examples. As a result, a Ba-glass having a particle size of 1 μm And is applied as the transparency adjusting agent of the present invention.

3) Step 4: Light-curing type  Dentistry Restoration material  Composition Preparation (S3)

In the final step, the transparency adjusting agent and the inorganic filler for strength reinforcement selected in the third step are sequentially added to the composite resin base prepared in the first step, and the mixture is stirred until it is completely melted, A repair composition is prepared.

At this time, high light permeability compared to conventional dental restorative compositions can be achieved, enabling transparent cervical coloring to be realized, naturally ensuring esthetics of various tooth areas, and improving refractive index and depth of polymerization. It is preferable that the composition contains 33 to 35% by weight of the composite resin base, 62 to 64% by weight of the transparency adjusting agent, and the rest of the inorganic filler for strength reinforcement Is most preferable.

Hereinafter, the present invention will be described in more detail with reference to Examples and Experimental Examples. However, these Examples and Experimental Examples are for illustrative purposes only and do not limit the scope of protection of the present invention.

< Example  1 to 3: Light-curing type  Dentistry Restoration material  Preparation of compositions>

As shown in the following Table 1, a methyl methacrylate (MMA) monomer and a polymerization initiator were prepared as follows and mixed at 100 rpm for 2 hours to prepare a composite resin base first.

Composite resin
Base
(Based on 100% by weight as a whole) MMA monomer Bis-GMA 32.884 wt% UDMA 32.884 wt% TEGDMA 32.884 wt% Polymerization initiator CQ 0.164 wt% 4-EDAB 0.822 wt% BHT 0.329 wt% BP 0.033 wt%

Then, the refractive index of the composite resin base was checked and found to have a refractive index of 1.55.

Next, barium-glass having a particle size of 1 μm having a refractive index of 1.55 was selected as an inorganic filler and used as a transparency regulator, and then added to the composite resin base.

Next, silicon dioxide, nano zirconia filler and synthetic amorphous silica were prepared as inorganic fillers for strength reinforcement, and then the mixture was added sequentially. The mixture was stirred until it was completely melted, Dental restorative compositions were prepared, which were prepared according to the contents of Table 2 below.

Overall configuration Example 1 Example 2 Example 3 The
Light-curing dental restorative composition
(Based on 100% by weight as a whole) The composite resin base of Table 1 33 wt% 34 wt% 35 wt% Transparency control agent
Ba-glass: 1 탆 64 wt% 63 wt% 62 wt% Inorganic filler 실리콘 이산화물 1 wt% 1 wt% 1 wt% nano zirconia filler 1.8 wt% 1.8 wt% 1.8 wt% synthetic amorphous silica
-TS530 0.2 wt% 0.2 wt% 0.2 wt%

< Comparative Example  1: Existing dentistry Restoration material  Manufacturing>

Methyl methacrylate (MMA) monomer, polymerization initiator, and inorganic filler were prepared as shown in Table 3, and then all of them were mixed together at 80 to 120 rpm for 2 hours to prepare a conventional dental restoration composition. At this time, barium-glass (Ba-glass) having a particle size of 0.7 탆 which is an inorganic filler commonly used for controlling the esthetics of dental restorative materials was used, and the refractive index of Ba-glass of 0.7 탆 1.45.

Overall configuration Comparative Example 1 existing
Dental restorative composition
(Based on 100% by weight as a whole) MMA monomer

Bis-GMA 12 wt% UDMA 12 wt% TEGDMA 12 wt% Polymerization initiator CQ 0.0853 wt% 4-EDAB 0.1219 wt% BHT 0.0424 wt% BP 0.65 wt% Inorganic filler 실리콘 이산화물 2.1004 wt% nano zirconia filler - synthetic amorphous silica
-TS530 - Ba-glass: 0.7 탆 61 wt%

< Experimental Example  1: Property test>

1. Experimental Method

The flexural strength, the compressive strength, the polymerization depth and the transparency of the photopolymerizable dental restorative compositions of Examples 1 to 3 and the conventional dental restorative compositions of Comparative Example 1 are shown in Table 4 below.

The flexural strength and the polymerization depth were measured according to the ISO 4049 standard, and the compressive strength was measured using a small UTM of 4 mm × 5 mm (diameter, depth) of the mold of the present invention. The transparency was measured according to the Journal of Biomedical Materials Research Part B: Applied Biomaterials, 2007 Feb; 80 (2): 332-8.

2. Experimental results

analysis Example 1 Example 2 Example 3 Comparative Example 1 Flexural Strength Mpa 99.59 95.54 94.07 43.28 Compressive strength Mpa 261.31 293.41 311.98 155.89 Polymerization Depth mm 9.8 9.8 9.4 3.2 Transparency (light transmittance)
(contrast ratio, 500 nm) 155 155 154 54

As a result of the experiment, it was confirmed that the flexural strength and the compressive strength were much higher than the conventional composition (Comparative Example 1) as shown in Table 4, and the embodiments of the present invention showed a lower control ratio in the visible light region than that of Comparative Example 1 As can be confirmed, it was confirmed that the transparency was excellent and the polymerization depth was also high

As a result, the photopolymerizable dental restoration composition according to the embodiments of the present invention exhibits high physical properties and is suitable for use as a dental restorative composition, and exhibits high light transmittance compared to conventional dental restorative compositions It is possible to realize the color of transparent cervical part and thus it is possible to naturally express the esthetics of various tooth parts naturally without adding any coloring matter and at the same time the polymerization depth is more than 2 times that of the conventional one. The composite resin filled in the deep region of the tooth cavity was transferred to the composite resin, which allowed the photopolymerization reaction area to be enlarged. As a result, the resin was hardened even once by the charging method, and the physical properties were improved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. You can implement the examples. The essential technical scope of the present invention is set forth in the appended claims and any differences within the scope of equivalents thereof should be construed as being included in the present invention

Claims (14)

(Bis-GMA), triethylene glycol dimethacrylate (TEGDMA), and urethane dimethacrylate (UDMA), as well as 2,2-bis [4- (2-hydroxy- And a polymerization initiator for initiating polymerization of the monomer, wherein the polymerization initiator is a mixture of methyl methacrylate (MMA) based monomer and a polymerization initiator which are mixed in a weight ratio of 1: 1: 1,
A transparency adjusting agent having the same refractive index as that of the composite resin base,
And an inorganic filler for strength reinforcement,
Wherein the composite resin base comprises 95 to 98.7% by weight of the methyl methacrylate (MMA) monomer and 1.3 to 5% by weight of the polymerization initiator based on the total weight of the composite resin base,
The polymerization initiator may be at least one selected from the group consisting of camphorquinone (CQ), 4- (dimethylamino) ethylbenzoate (4-EDAB), 2,6-di-tert- -Methoxybenzophenone (BP), &lt; / RTI &gt;
The transparency adjusting agent is Ba-glass having a particle size of 1 탆,
The inorganic filler is composed of a mixture of silicon dioxide, nano zirconia filler and synthetic amorphous silica,
33 to 35% by weight of the composite resin base, 62 to 64% by weight of the transparency adjusting agent, and the remaining inorganic filler,
Wherein the polymerized depth according to ISO 4049 is 9.4 to 9.8 mm.
delete delete delete delete delete delete (Bis-GMA), triethylene glycol dimethacrylate (TEGDMA), and urethane dimethacrylate (UDMA), as well as 2,2-bis [4- (2-hydroxy- Is mixed at a weight ratio of 1: 1: 1, and a polymerization initiator for initiating polymerization of the monomer are mixed at 80 to 120 rpm for 1 to 2 hours to prepare a composite resin base A first step of manufacturing,
A second step of measuring a refractive index of the composite resin base prepared in the first step,
A third step of selecting a transparency adjusting agent having the same refractive index as the refractive index of the composite resin base measured in the second step;
The transparency adjusting agent and the inorganic filler for strength reinforcement selected in the third step are sequentially added to the composite resin base prepared in the first step and then stirred until completely dissolved to prepare a photopolymerizable dental restorative composition. Comprising:
Wherein the methyl methacrylate (MMA) monomer is used in an amount of 95 to 98.7 wt% based on the total weight of the composite resin base, 1.3 to 5 wt% of the polymerization initiator based on the total weight of the composite resin base %, Respectively,
The selected transparency adjusting agent in the third step is Ba-glass having a particle size of 1 탆,
The inorganic filler added in the fourth step of the upper part is composed of a mixture of silicon dioxide, nano zirconia filler and synthetic amorphous silica,
In the fourth step, the composite resin base and the transparency adjusting agent are contained in an amount of 33 to 35% by weight and 62 to 64% by weight, respectively, based on the total weight of the composition,
Wherein the composition has a polymerization depth of from 9.4 to 9.8 mm according to ISO 4049. &lt; RTI ID = 0.0 &gt; 8. &lt; / RTI &gt; delete 9. The method of claim 8,
Wherein the refractive index of the composite resin base measured in the second step is 1.55.
A method for preparing a light-curing dental restoration composition.
delete delete delete delete

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