KR20220096250A - High strengthen and high aesthetic composite material for tooth restoration and method thereof - Google Patents

Abstract

The present invention relates to a reinforced composite material for dental restoration, and a manufacturing method thereof. More specifically, the present invention relates to: a reinforced composite material for dental restoration with improved strength and aesthetics, and excellent processability by combining biocompatible ceramics with methyl methacrylate (MMA)-based polymer materials; and a manufacturing method thereof.

Description

High-strength and highly esthetic composite material for dental restoration and manufacturing method thereof

The present invention relates to a reinforced composite material for tooth restoration and a method for manufacturing the same, and more specifically, a high-strength, highly esthetic tooth capable of improving physical properties and esthetics by compounding a biocompatible ceramic with an MMA-based polymer material having an unsaturated double bond. It relates to a method for manufacturing a reinforcing composite material for restoration.

Medical materials can be broadly classified into metal, ceramic, and polymer materials. Metal has excellent mechanical properties such as tensile strength and compressive strength, and has a desired shape such as cutting, grinding, and forming. It is easy to process with a furnace and relatively stable to chemical reactions, but the metal material is strongly bound to inhibit the growth of bone tissue.

Ceramic material is a material with high affinity when used in the body, but has low impact strength and cannot be deformed after being manufactured, so it is difficult to respond to shape deformation and bone recovery.

Currently, medical materials tend to use high-strength, easy-to-process, and bio-stable polymer materials by fusion and fusion. Medical polymers are used in a wide range of fields such as bone cement, heart valves, contact lenses, artificial soft tissues, bio-fillers, materials for 3D printing, and artificial joints, and the areas used are also increasing.

In general, when teeth are damaged by caries, gum disease, tooth extraction, etc., it is difficult to shred for food intake, or the face shape is gradually asymmetrically deformed to have a sense of atrophy in the gaze of others. In order to lead a life, prompt treatment and replacement of artificial teeth are essential.

As described above, various prosthetic procedures such as implants, bridges, and dentures are used as a treatment method for teeth damaged by tooth decay, gum disease, tooth extraction, and the like. For patients with damaged or missing teeth, mastication and aesthetic treatment are performed through dental restoration or prosthetic treatment, which is a replacement treatment for teeth. Depending on the procedure, dental restoration can be largely divided into direct restoration and indirect restoration. Direct restoration is performed on small areas that can be restored in the oral cavity by methods such as chemical curing and light curing. A typical example is prosthetic surgery.

A prosthetic procedure is a procedure to cut out the affected part of a tooth that needs treatment due to partial damage caused by caries or fracture of the tooth and seal it with a tooth replacement material in the formed cavity. is the material

Dental restorative materials are key dental materials that are used in a wide range of areas such as orthodontics and esthetic dental treatment, as well as general dental procedures to restore the entire crown or to restore the entire crown caused by caries or fracture of the tooth. one of them

These dental restorative materials require various properties unlike general materials due to the special environment in the oral cavity. That is, a humid environment with a relative humidity close to 100%, high occlusal pressure generated during mastication, rapid temperature change, close contact with living tissue, frequent side effects such as hypersensitivity reactions, and resident in the oral cavity of countless bacterial species. It should be manufactured taking into account factors. In addition, it is necessary to consider the color harmony with hemorrhoids, reflecting the individual's high esthetic needs due to the recent development of mass media.

Prosthetics refers to the production of artificial replacements such as fixed prostheses or removable prostheses for the area from which teeth were extracted in order to minimize the side effects of tooth loss. The fixed prosthesis is a method in which the surface of the adjacent natural teeth in the front and rear of the missing teeth is ground by about 1.0 ~ 1.5 mm and covered with the prosthesis. Like natural teeth, there is a tendency to restore with crowns or bridges without using dentures or partial dentures, as it is easy to pronounce, has no foreign substances, and has high mastication efficacy. Removable prostheses are inevitably used when the rearmost teeth or many teeth are lost and there is not enough sound abutment to use for a fixed prosthesis. Although the treatment period is short and the cost is low, the amount of foreign material is large and the masticatory efficiency is greatly reduced by 1/4 to 1/10.

Dental prostheses are often customer-specific materials used as replacements for dental structures. Common dental prostheses include restorations, supplements, inlays, onlays, veneers, full and partial crowns, bridges, implants, posts, etc. can be heard The prosthesis is manufactured manually by a dentist with specialized knowledge or by a technician who is a professional manufacturer who is skilled in a laboratory that can manufacture it.

A prosthesis for use in prosthetics is manufactured by utilizing the above-mentioned medical materials, and as in Korean Patent Application Laid-Open No. 10-2009-0056121, dentures are manufactured using poly methyl metacrylate (PMMA).

However, PMMA has disadvantages in that it is easy to wear or scratch the surface due to the fragility of flexural strength and surface strength, and is easily broken by external force.

Accordingly, there is an urgent need for research and development of materials to solve the above problems.

The present invention relates to a reinforced composite material for dental restoration and a method for manufacturing the same.

An object of the present invention is to provide a reinforced composite material for dental restoration that has superior strength compared to the existing PMMA block, and has a lower possibility of being damaged by an external impact.

An object of the present invention is to provide a reinforced composite material for dental restoration that can be used as inlay, onlay, veneer, and single crown, which are restoration materials for indirect restoration, when manufactured as a reinforced composite material for dental restoration.

Another object of the present invention is to provide a reinforced composite material for dental restoration using equipment in which temperature and pressure are kept constant in order to impart high-strength physical properties.

Other objects and advantages of the present invention will become more apparent from the following detailed description, appended scope and drawings.

The composite material for dental restoration according to an embodiment of the present invention for achieving the above object is a reinforced composite material for dental restoration and a manufacturing method thereof, wherein the polymer having an unsaturated double bond is 1 to 40 weight based on the total weight of the composition. % and biomaterial ceramics comprise 30 to 99% by weight, 0.01 to 10% by weight of initiator, 0.001 to 10% by weight of additives and 0.0001 to 5% by weight of pigment.

In addition, the polymer having an unsaturated double bond may be a methyl methacrylate (MMA)-based monomer.

In addition, the particle size of the biomaterial ceramic may be 0.01 to 10 μm.

In addition, the polymer having an MMA-based unsaturated double bond is 2,2-bis-(4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl)propane (Bis-GMA), ethylene glycol dimethacrylic Late (TGDMA), triethyleneglycol dimethacrylate (TEGDMA), ethoxylate bisphenol A dimethacrylate (Bis-EMA), urethane dimethacrylate (UDMA), dipentaerythritol pentaacrylate mono phosphate (dipentaerythritol pentaacrylate monophosphate, PENTA), 2-hydrozyethyl methacrylate (HEMA), polyalkenic acid, biphenyl dimethacrylate (BPDM), and glycerol It may be one or two or more polymers selected from the group consisting of phosphate dimethacrylate (glycerol phosphate dimethacrylate, GPDM).

The biomaterial ceramic may also include inorganic fillers and/or organic fillers.

In addition, the biomaterial ceramic may be one or two or more selected from the group consisting of amorphous synthetic silica, crystalline natural silica, barium aluminum silicate, strontium aluminum silicate, zirconium silicate, kaolin, talc, zirconia, and acid reactive fillers.

In addition, the initiator may include a photopolymerization initiator and/or and/or a thermal polymerization initiator.

In addition, the photopolymerization initiator is benzyl dimethyl ketal (Benzyl dimethyl ketal), benzophenone (Bezophenone), 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (2,4,6-Trimethylbenzoyl-diphenyl-phosphineoxide, TPO) ), camphorquinone, and the thermal polymerization initiator is benzoyl peroxide (BPO), t-butylperoxybenzoate (TBPB), 2,2-azobisisobutyronitrile (2,2-Azobisisobutyronitrile, AIBN) It may be one or two or more selected from the group consisting of.

In addition, the additive is one selected from the group consisting of hydroquinone (HQ), hydroquinone mono methyl ether (MEHQ), hydroquinone mono ethyl ether (EEHQ), Tinuvin, Iganox, butylated hydroxy toluene (BHT) or two or more.

In addition, the pigment may be made of iron oxide (FeO).

In addition, the polymer having the MMA-based unsaturated double bond may be included in an amount of 1 to 40% by weight based on the total weight of the composition.

In addition, the biomaterial ceramic may be included in an amount of 30 to 99% by weight based on the total weight of the composition.

In addition, the polymerization initiator may be included in an amount of 0.01 to 10% by weight based on the total weight of the composition.

In addition, the additive may be included in an amount of 0.001 to 10% by weight based on the total weight of the composition.

In addition, the pigment may be included in an amount of 0.0001 to 5% by weight based on the total weight of the composition.

According to an embodiment of the present invention, a method of manufacturing a high-strength, highly esthetic reinforced composite material for dental restoration capable of improving physical properties and esthetics by compounding a biocompatible ceramic with an MMA-based polymer material having an unsaturated double bond is provided. do.

1 is a flowchart for a method of manufacturing a reinforced composite material for dental restoration of the present invention.
Figure 2 is a process schematic diagram for the process of manufacturing the reinforced composite material for tooth restoration of the present invention.
3A is a result of analysis of flexural strength according to pressure in the curing step.
3b is a result of analysis of flexural strength according to temperature in the curing step.
4 is a result of color comparison comparing the reinforced composite material for tooth restoration and Sunjinsa according to the addition of pigment.
5 is a result of CIE color system (L*, a*, b*) and color difference values (ΔE*) comparing the tooth restoration reinforced composite material and Sunjinsa according to the addition of pigment.

Examples of the present invention are provided to more completely explain the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and the scope of the present invention is as follows It is not limited to an Example. Rather, these examples are provided so that this disclosure will be more thorough and complete, and will fully convey the spirit of the invention to those skilled in the art.

In addition, in the drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description, and the same reference numerals refer to the same elements in the drawings. As used herein, the term “and/or” includes any one and any combination of one or more of those listed items.

The terminology used herein is used to describe specific embodiments, not to limit the present invention. As used herein, the singular form may include the plural form unless the context clearly dictates otherwise. Also, as used herein, “comprise” and/or “comprising” refers to specifying the presence of the recited shapes, numbers, steps, actions, members, elements, and/or groups thereof. and does not exclude the presence or addition of one or more other shapes, numbers, movements, members, elements and/or groups.

Hereinafter, a reinforced composite material for dental restoration according to an embodiment of the present invention will be described.

In one embodiment of the present invention, the polymer having an unsaturated double bond is an MMA polymer having an unsaturated double bond and is not limited to a specific polymer, and 2,2-bis-(4-(2-hydroxy-3-meta) Acryloyloxypropoxy)phenyl)propane (Bis-GMA), ethylene glycol dimethacrylate (TGDMA), triethylene glycol dimethacrylate (TEGDMA), ethoxylate bisphenol A dimethacrylate (Bis-EMA) ), urethane dimethacrylate (UDMA), dipentaerythritol pentaacrylate monophosphate (PENTA), 2-hydrozyethyl methacrylate (HEMA), polyalkeno It may be one or two or more selected from the group consisting of polyalkenic acid, biphenyl dimethacrylate (BPDM), and glycerol phosphate dimethacrylate (GPDM). Particularly preferably a mixture of 2,2-bis-(4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl)propane (Bis-GMA) and triethyleneglycol dimethacrylate (TEGDMA) may be in the form

The size of the particles used in the tooth restoration reinforcing composite material is not limited, but a preferred example may be 0.01 to 10 μm. When particles with a size larger than 10 μm are used, a relatively decrease in physical properties occurs, chipping occurs during CAD/CAM processing, and when particles with a size smaller than 0.01 μm are used, the composition due to an increase in surface area It is not preferable because the viscosity of the mixture is high, so it is not possible to remove the bubbles inside, and it is not possible to prepare a homogeneous mixture.

The additive polymerization initiator may be variously performed by a cation formation mechanism, an anion formation mechanism, a radical formation mechanism, etc. depending on the type of catalyst used in the polymerization reaction, and the double radical formation mechanism is most commonly used. According to these mechanisms, the polymerization reaction can be carried out by photopolymerization, thermal polymerization, or the like.

The photopolymerization reaction is benzyl dimethyl ketal (Benzyl dimethyl ketal), benzophenone (Bezophenone), 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (2,4,6-Trimethylbenzoyl-diphenyl-phosphineoxide, TPO) , may be one or two or more selected from the group consisting of camphorquinone. Preferably it can be done with camphorquinone.

The thermal polymerization reaction is one selected from the group consisting of benzoyl peroxide (BPO), t-butylperoxybenzoate (TBPB), 2,2-azobisisobutyronitrile (AIBN), or There may be more than one. Preferably it can be done with benzoyl peroxide (BPO).

Other known compounds may be added to the composition of the present invention within a range that does not impair the effects of the present invention, and examples of such substances include polymerization inhibitors, antioxidants, and pigments.

In the present invention, the biomaterial ceramic may include an inorganic filler.

Examples of the inorganic filler include, but are not limited to, amorphous synthetic silica, crystalline natural silica, barium aluminum silicate, strontium aluminum silicate, zirconium silicate, kaolin, talc, zirconia, acid-reactive filler, and the like. Depending on the circumstances, it may be used in the form of two or more mixtures.

In general, since inorganic fillers are hydrophilic and have poor compatibility with the hydrophobic MMA-based monomer, affinity with the monomers can be increased by including a binder component or surface treatment of the inorganic filler with a silane coupling agent. Specific examples of the silane coupling agent as the hydrophobic surface treatment agent of the inorganic filler are well-known compounds, and a detailed description thereof will be omitted.

In the present invention, polymerization equipment may include equipment that maintains constant temperature and pressure.

The polymerization equipment is not particularly limited as long as the temperature and pressure are kept constant. Preferably, a constant temperature pressurization autoclave and/or a medical hot isostatic pressurization apparatus are mentioned.

The pressure conditions may include 1 to 1,000 bar, preferably 5 to 700 bar, and when lower than 5 bar, physical properties are not improved, and when higher than 700 bar, there is no change even when pressure is applied any more. The temperature condition may be 0 to 1000 °C, preferably 50 to 300 °C, if lower than 50 °C, polymerization does not proceed, and if it is higher than 300 °C, the polymer may be deformed.

In one embodiment of the present invention, the present invention comprises the steps of 1) mixing an additive, an initiator, and a pigment to the unsaturated double bond polymer 2) mixing the biomaterial ceramic with the mixture of step 1) and mixing for 24 to 36 hours , 3) relates to a method for manufacturing a reinforcing composite material for tooth restoration according to claim 1, comprising the step of curing the mixture of step 2).

In one embodiment of the present invention, step 1) of the present invention comprises 1 to 40% by weight of an unsaturated double bond polymer; 0.01 to 10% by weight of an initiator; 0.001 to 10% by weight of additives; and 0.0001 to 5% by weight of a pigment, but is not limited thereto.

In one embodiment of the present invention, step 2) of the present invention includes mixing the biomaterial ceramic into the mixture of step 1) with a vacuum high-viscosity mixer for 24 to 36 hours to obtain a homogeneous mixture of polymer and inorganic filler Therefore, it is not limited to examples.

In one embodiment of the present invention, step 3) of the present invention is a step of curing the mixture, using a constant temperature pressure autoclave and/or a medical hot isostatic pressure device to cure the polymer, in nitrogen, argon, air atmosphere hardened in In the curing step, the pressure may be 1 to 1,000 bar, preferably 5 to 700 bar, if lower than 5 bar, physical properties are not improved, and if higher than 700 bar, there is no change even if the pressure is applied any more. The temperature condition may be 0 to 1000 °C, preferably 50 to 300 °C, if lower than 50 °C, polymerization does not proceed, and if it is higher than 300 °C, the polymer may be deformed.

In one embodiment of the present invention, the present invention may be a reinforced composite material for dental restoration that can be used as inlay, onlay, veneer, and single crown, which are restoration materials for indirect restoration, when manufactured with the reinforced composite material for dental restoration. . A restoration material is a prosthesis that is attached to a tooth when a tooth is missing, and the reinforced composite material for tooth restoration of the present invention can be manufactured using a CAD/CAM system.

Hereinafter, the present invention will be described in more detail through examples. These examples are only for more practical explanation of the present invention, and it will be apparent to those of ordinary skill in the art that the scope of the present invention is not limited by these examples according to the gist of the present invention. will be.

1 is a flowchart of a method for manufacturing a reinforced composite material for tooth restoration of the present invention, specifically, step 1) comprises 1 to 40% by weight of an unsaturated double bond polymer; 0.01 to 10% by weight of an initiator; 0.001 to 10% by weight of additives; and 0.0001 to 5% by weight of the pigment, step 2) is to mix the biomaterial ceramic with the mixture of step 1) with a reduced pressure high-viscosity mixer for 24 to 36 hours to obtain a homogeneous mixture of polymer and inorganic filler Including step, step 3) is a step of curing the mixture, using a constant temperature pressure autoclave and/or a medical hot isostatic pressure device, to cure the polymer, and is cured in nitrogen, argon, or air atmosphere. In the curing step, the pressure may be from 1 to 1,000 bar, preferably from 5 to 700 bar, if lower than 5 bar, the physical properties are not improved, and if it is higher than 700 bar, there is no change in the physical properties even if the pressure is further applied. none. The temperature condition may be 0 to 1000 °C, preferably 50 to 300 °C, if lower than 50 °C, polymerization does not proceed, and if it is higher than 300 °C, the polymer may be deformed. More specifically, after the mixture is put into the mold, curing is performed.

Preparation of mixtures of MMA-based polymers

To 1 to 40% by weight of Bis-GMA and TEGDMA, 0.01 to 10% by weight of initiator, 0.001 to 10% by weight of additive, and 0.0001 to 5% by weight of pigment are weighed and placed in a sealed container and the temperature of 35 to 50 ℃ can be set A mixture is prepared by mixing for 10 to 24 hours using a mechanical stirrer.

Preparation of MMA-based mixtures and biomaterial ceramic mixtures

In a high-viscosity mixer, mix 2 or more of the inorganic filler of the biomaterial ceramic to the mixture of MMA-based polymer by dividing 30 to 99% by weight several times. and mixing for 24 to 36 hours to prepare a homogeneous mixture.

Hardening properties of reinforced composite materials for dental restoration

Example 1

After putting the reinforced composite material for tooth restoration prepared in Preparation Example into a mold as shown in FIG. 2, it was cured with a medical hot isostatic pressing device. The curing conditions were specifically, 20 bar pressure and 110 ℃ curing.

Example 2

It was prepared in the same manner as in Example 1, except that it was cured at a pressure of 86 bar and 110°C.

Example 3

It was prepared in the same manner as in Example 1, except that it was cured at 100 bar and 110 °C.

Example 4

It was prepared in the same manner as in Example 1, except that it was cured at 200 bar and 110 °C.

Example 5

It was prepared in the same manner as in Example 1, except that it was cured at 400 bar and 110 °C.

Comparative Example 1

Except for pressure, it was prepared in the same manner as in Example 1, except that it was cured at 90 ℃.

Comparative Example 2

Except for the pressure, it was prepared in the same manner as in Example 1, except that it was cured at 100 ℃.

Comparative Example 3

Except for the pressure, it was prepared in the same manner as in Example 1, except that it was cured at 110 ℃.

Comparative Example 4

Except for pressure, it was prepared in the same manner as in Example 1, except that it was cured at 120 ℃.

Comparative Example 5

Except for the pressure, it was prepared in the same manner as in Example 1, except that it was cured at 150 ℃.

Experimental Example 1

Physical properties according to polymerization conditions of reinforced composite materials for dental restoration

An experiment was conducted for the purpose of selecting the optimal conditions for the manufacture of the reinforced composite material for dental restoration through the physical properties of the specimen prepared according to the temperature and pressure of the medical hot isostatic pressing device.

The specimen for flexural strength analysis was carried out by referring to ISO 6872 and/or ISO 4049, and the specimen was manufactured based on 2 Х 2 Х 25 (mm). Results were derived as average values.

The results are the same as in FIG. 3, and specifically, it was confirmed that the flexural strength slightly increased as the pressure increased, but the increase was gradually reduced, so it can be determined that this is a sufficient condition for manufacturing at a pressure of 400 bar or more.

Experimental Example 2

Visual Characteristics of Reinforced Composite Materials for Dental Restoration

By mixing the pigment in Example 4 in proportions, it was manufactured to implement shades of Dentin A series A1, A2, A3, A3.5 A4, and as a reinforced composite material for tooth restoration through Sunjin's products and examples as shown in FIG. After the manufactured product was prepared in specimen sizes 15 and 1T, the color tones were compared, and L*, a*, b*, and ΔE* values were measured with a spectrocolorimeter as shown in FIG. 5 .

What has been described above is only one embodiment for implementing the control box 100 capable of checking the internal temperature according to the present invention, and the present invention is not limited to the above embodiment, but is claimed in the claims below. As such, it will be said that the technical spirit of the present invention exists to the extent that various modifications can be made by anyone with ordinary knowledge in the field to which the invention pertains without departing from the gist of the present invention.

Claims (15)

A reinforced composite material for tooth restoration and a method for manufacturing the same, comprising:
Based on the total weight of the composition, 1 to 40% by weight of the polymer having an unsaturated double bond, 30 to 99% by weight of the biomaterial ceramic, 0.01 to 10% by weight of the initiator, 0.001 to 10% by weight of the additive, and 0.0001 to 5% by weight of the pigment Reinforced composite material for dental restoration, characterized in that it comprises. The method of claim 1,
Reinforced composite material for dental restoration, characterized in that the polymer having an unsaturated double bond is a methyl methacrylate (MMA)-based monomer. The method of claim 1,
Reinforced composite material for dental restoration, characterized in that the particle size of the biomaterial ceramic is 0.01 ~ 10 ㎛. 3. The method of claim 2,
Polymers having MMA-based unsaturated double bonds are 2,2-bis-(4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl)propane (Bis-GMA), ethylene glycol dimethacrylate ( TGDMA), triethylene glycol dimethacrylate (TEGDMA), ethoxylate bisphenol A dimethacrylate (Bis-EMA), urethane dimethacrylate (UDMA), dipentaerythritol pentaacrylate monophosphate ( dipentaerythritol pentaacrylate monophosphate (PENTA), 2-hydrozyethyl methacrylate (HEMA), polyalkenic acid, biphenyl dimethacrylate (BPDM), and glycerol phosphate di Reinforcing composite material for dental restoration, characterized by one or more polymers selected from the group consisting of methacrylate (glycerol phosphate dimethacrylate, GPDM). The method of claim 1,
The biomaterial ceramic is characterized in that it contains inorganic fillers and/or organic fillers,
Composite material for dental restoration. 6. The method of claim 5,
The biomaterial ceramic is one or more selected from the group consisting of amorphous synthetic silica, crystalline natural silica, barium aluminum silicate, strontium aluminum silicate, zirconium silicate, kaolin, talc, zirconia, and acid reactive filler. taking composites. The method of claim 1,
The initiator is a photopolymerization initiator and/or and/or a thermal polymerization initiator, characterized in that it comprises a dental dental composite material. 8. The method of claim 7,
The photopolymerization initiator is benzyl dimethyl ketal, benzophenone, 2,4,6-trimethylbenzoyl-diphenyl-phosphineoxide (2,4,6-Trimethylbenzoyl-diphenyl-phosphineoxide, TPO), Camphorquinone, and the thermal polymerization initiator is benzoyl peroxide (BPO), t-butylperoxybenzoate (TBPB), 2,2-azobisisobutyronitrile (2,2-Azobisisobutyronitrile, AIBN) consisting of Composite material for dental restoration, characterized in that one or two or more selected from the group. The method of claim 1,
The additive is one or two selected from the group consisting of hydroquinone (HQ), hydroquinone mono methyl ether (MEHQ), hydroquinone mono ethyl ether (EEHQ), Tinuvin, Iganox, butylated hydroxy toluene (BHT) Composite material for dental restoration, characterized in that the above. The method of claim 1,
A composite material for dental restoration, characterized in that the pigment is made of iron oxide (FeO). 5. The method of claim 4,
Composite material for dental restoration, characterized in that the polymer having the MMA-based unsaturated double bond is included in an amount of 1 to 40% by weight based on the total weight of the composition. 7. The method of claim 6,
The biomaterial ceramic is a composite material for dental restoration, characterized in that it is contained in an amount of 30 to 99% by weight based on the total weight of the composition. 9. The method of claim 8,
The polymerization initiator is a composite material for dental restoration, characterized in that it is included in an amount of 0.01 to 10% by weight based on the total weight of the composition. 10. The method of claim 9,
The additive is a composite material for dental restoration, characterized in that it is contained in an amount of 0.001 to 10% by weight based on the total weight of the composition. 11. The method of claim 10,
A composite material for dental restoration, characterized in that the pigment is contained in an amount of 0.0001 to 5% by weight based on the total weight of the composition.

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