WO2016032012A1

WO2016032012A1 - Hollow column-shaped composite blank for indirect dental restorations

Info

Publication number: WO2016032012A1
Application number: PCT/KR2014/007882
Authority: WO
Inventors: 오명환; 김원호; 유현철; 이대영; 김윤기
Original assignee: (주) 베리콤
Priority date: 2014-08-25
Filing date: 2014-08-25
Publication date: 2016-03-03

Abstract

The present invention relates to a hollow column-shaped dental composite blank having a hollow inside and being produced using a blank composition comprising: at least one selected between a monomer having an unsaturated double bond and an oligomer having an unsaturated double bond; a filler; and a polymerization initiator. The dental composite blank according to the present invention has uniform and excellent physical properties regardless of the position thereof and has no crack, and multiple indirect restorations can be produced using the one dental composite blank.

Description

Composite blank in the form of a hollow column for indirect dental restoration

The present invention relates to a hollow pillar-shaped composite blank for indirect dental restorations, and more particularly to a hollow pillar-shaped composite composite blank having excellent physical properties without uniform cracks.

At present, dental and aesthetic treatments are performed for dental damaged or defective patients through dental restoration or prosthetic procedures. Depending on the procedure, dental restorations can be broadly divided into direct and indirect restorations. Direct restoration is used for small areas that can be restored in the oral cavity. The curing method uses chemical curing and photocuring. Typical indirect restoration prosthesis fabrication can use a variety of materials and hardening methods.

Dental restorative materials used in dental restorations can be used for a wide range of dental repairs and aesthetic dental treatments, in addition to general dental procedures for repairing or fixing the entire crown or tooth breakage caused by dental caries or fractures. One of the key dental materials in use.

In order to minimize the side effects of tooth loss, dental prosthesis is a method of artificial prosthesis such as a fixed prosthesis (crown, bridge) or a removable prosthesis (prosthesis that can be inserted and removed; denture, partial denture). To make a substitute. Dental prostheses are often used as a substitute for dental structures on a custom basis.

Common dental prostheses include restorations, supplements, inlays, onlays, veneers, full and partial crowns, bridges, implants, posts, etc. Can be mentioned. The prosthesis is produced by a technician, a professional manufacturer who is skilled in laboratories that can be manufactured by hand or by a skilled dentist.

Traditional dental prosthesis manufacturing procedures require a patient to visit at least two dentists. At the first visit, it is a rubber-like product that impresses teeth and teeth. After that, the prosthesis is made of metal, ceramic, or composite material, and after the completion of the production, the prosthesis is comfortably aligned with the patient's oral condition. The dental prosthesis manufacturing period takes a period of 1 day to 2 days or more, and since the production of the dental prosthesis by the manual labor of the technicians require a high level of skill and finesse.

Recent advances in technology have led to the emergence of computer automation equipment such as optics, digitizers, mechanical milling machines, and CAD / CAM, which has significantly shortened the laboratories' area of work and the creation of dental prostheses. Such computer automation equipment produces dental prostheses by cutting, milling and grinding the required restorations into precise shapes and forms at a faster speed and lower labor than conventional manual methods. CAD / CAM devices include ce.novation (Inocermic, Germany), Ceron (Degudent, Germany), Cerec 3D (Sirona, Germany), Cerec InLab (Sirona, Germany), Decim (Cad.esthetcs, Sweden), DigiDent (Girrbach, Germany), etkon (etkon, Germany), Everest (Kavo, Germany), Evolution 4D (D4D Technologies, USA), GN-1 (GC international, Japan), Lava (3M ESPE, Germany), Medfacturing (Bego Medical, Germany) ), Pricident DCS (DCS, Switzerland), Perfactory (DeltaMed, Germany), Procera Biocare, Sweden), Pro 50 (Cynovad, Canada), Wol-Cram (Wol-Dent, Germany), Xawx (Xawex, Switzerland), ZEN -CAM (ZFN, Germany), ZirkonZahn (Steger, Italy) and the like are commercially available.

Dental prostheses using CAD / CAM devices typically use a mill blank, i.e. a solid blank, which is the material from which the prosthesis is cut or engraved. Mill blanks are typically made of ceramic material. VITA CELAY ™ porcelain blanks, VITA Mark II Pitablocks ™ and PITA IN-CERAM ™ ceramic blanks (Vita Zahn, Bad Saggingen, Germany) Commercially available mill blanks are available. In addition, machineable mica ceramic blanks (eg, Corning MACOR ™ blanks and Dentsply DICOR ™ blanks) are commercially available.

In this regard, US Patent Publication No. US2003-0031984 discloses ceramic dental mill blanks. The ceramic dental mill blanks are mill blanks used for CAD / CAM, and the materials are very hard, resulting in excessive wear of the tool and a long time for producing a dental prosthesis. Due to the relatively high production cost.

US Patent No. 6,899,948 discloses dental materials having improved visual opacity and mechanical strength by applying nano-sized silica particles. However, the application of nano-sized silica particles having an average size of 200 nm or less has a disadvantage in that the dental composition lacks rheological properties.

US Patent No. 7,255,562 discloses a dental mill blank consisting of a polymeric resin matrix and a filler. The dental mill blank has suppressed crack generation generated during mill blank manufacture and has excellent cuttability and hardness. However, cracks are still generated when the blank is made of a large size. This is because the self-stress on the polymerization shrinkage rate due to photocuring could not be controlled.

Usually, the direction of polymerization shrinkage is directed toward the center of gravity of the self-polymerization type and the direction of the light source to the photopolymerization type. Since the van der Waals interaction between monomers before the polymerization process is converted into a strong covalent bond through polymerization, a certain amount of shrinkage occurs. The force of shrinkage is very strong, causing blank margins or cracks in the material itself.

In the case of the self-polymerizing type, it has a buffering effect of shrinkage stress caused by bubbles in the mixing process of the composite paste, and the curing process of the composite paste (gel point) is not as rapid as photopolymerization. Less cracking occurs but overall physical properties are much lower than those of photopolymerization.

In the case of photopolymerization, the total energy required for polymerization is expressed as the product of light intensity and time, which is polymerized in proportion to this amount. After all, if rapid hardening affects the shrinkage, in order to reduce the stress of the polymerization shrinkage, the polymerization may be performed for a long time with weak light. The methods derived from this principle are relatively weakly irradiated with light intensity, allowing the hardening of the mill blank to proceed slowly, as in autopolymerization, to disperse the self stress, to delay the complete hardening of the mill blank, and to induce weak bonding or hardening. It is a method of finally polymerizing after waiting for a certain time. Although it is mentioned in US Patent No. 7,255,562, there is a problem that the uncured portion is generated and the crack incidence is not lowered because light is not transmitted to the inside of a large size mill blank.

Therefore, there is a need for development of a dental composite blank without cracks and without differences in physical properties between processed prostheses.

It is an object of the present invention to provide a dental composite blank having uniform and excellent physical properties and no cracking.

Another object of the present invention is to provide a dental composite blank in which the plurality of indirect restorations have uniform physical properties when the plurality of indirect restorations are manufactured in the dental composite blank molded into a hollow pillar shape.

It is another object of the present invention to provide a dental composite blank capable of producing a plurality of dental indirect restorations from one dental composite blank.

According to one aspect of the invention,

In the dental composite blank,

The dental composite blank is at least one selected from monomers containing unsaturated double bonds and oligomers containing unsaturated double bonds; filler; And is made of a blank composition comprising a polymerization initiator,

The dental composite blank is provided with a dental composite blank in the form of a hollow pillar comprising a hollow therein.

The hollow pillar may be any one selected from among a hollow cylinder, a hollow elliptic cylinder, and a hollow polygonal cylinder, and the hollow may be any one selected from a cylinder, an elliptic cylinder, and a polygonal cylinder.

The hollow polygonal pillar, the hollow square pillar, the hollow pentagonal pillar, the hollow hexagonal pillar, the hollow octagonal pillar, the hollow octagonal pillar, the hollow octagonal pillar, the hollow octagonal pillar, the hollow rim pillar and the hollow twelve. Any one selected from each column,

The hollow may be any one selected from a square pillar, a pentagonal pillar, a hexagonal pillar, a octagonal pillar, an octagonal pillar, a octagonal pillar, a decagonal pillar, a rim pillar and a twelve pillar.

The hollow pillar shape may be in the form of a washer.

The ratio (D / d) of the diameter (D) of the pillar to the diameter (d) of the hollow may be 1 to 25.

The ratio (D / d) of the diameter (D) of the pillar to the diameter (d) of the hollow may be 5 to 20.

The dental composite blank may be polymerized by molding the blank composition into a hollow pillar shape.

The blank composition is at least one 100 parts by weight selected from monomers including unsaturated double bonds and oligomers containing unsaturated double bonds; 0.001 to 5 parts by weight of a polymerization initiator; And 40 to 900 parts by weight of a filler.

The polymerization initiator may include at least one selected from a photopolymerization initiator and a thermal polymerization initiator.

The monomer including the unsaturated double bond may be a methacrylate (MA) monomer.

The methacrylate monomers include 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 dimethacryl It may be at least one selected from the group (glycerol phosphate dimethacrylate, GPDM).

The methacrylate monomers include 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane (Bis-GMA), ethylene glycol dimethacrylate (TGDMA) , Ethoxylate bisphenol A dimethacrylate (Bis-EMA), and urethane dimethacrylate (UDMA).

The filler may include at least one selected from inorganic fillers and organic fillers.

The inorganic filler may be synthetic amorphous silica, crystalline silica, barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, barium fluoroaluminoborosilicate Barium aluminoborosilicate, strontium silicate, strontium borosilicate, strontium aluminoborosilicate, calcium silicate, calcium silicate, alumino borosilicate It may include one or more selected from alumino silicate, silicon nitrides, titanium dioxide, calcium hydroxy apatite, zirconia, and bioactive glass. .

Barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, barium aluminoborosilicate, strontium silicate, strontium silicate Silicate (strontium borosilicate), and strontium aluminoborosilicate (strontium aluminoborosilicate) is in the form of particles, the size of the particles (size) may be 0.2 to 3㎛.

The synthetic amorphous silica, crystalline silica and zirconia may be in the form of particles, and the size of the particles may be 5 to 100 nm.

The dental composite blank may have a diameter D of 10 to 110 mm and a diameter d of 5.5 to 20 mm of the hollow pillar.

According to another aspect of the invention,

At least one selected from monomers containing unsaturated double bonds and oligomers containing unsaturated double bonds; filler; And (a) preparing a blank composition comprising a polymerization initiator;

(B) filling the blank composition into a mold in the form of a hollow column; And

(C) polymerizing the composition filled in the mold to form a composite blank in the form of a hollow column;

Provided is a method of manufacturing a dental composite blank comprising.

Method for producing the dental composite blank

After the step (b) may further comprise the step (b ') of removing the bubbles of the blank composition filled in the mold in the form of the hollow pillar.

According to the present invention, it is possible to provide a dental composite blank having uniform and excellent physical properties and no cracking.

In addition, according to the present invention, when manufacturing a plurality of indirect restorations in the dental composite blank molded in the form of a hollow column, the plurality of indirect restorations may provide a dental composite blank having uniform physical properties.

In addition, according to the present invention can provide a dental composite blank capable of producing a plurality of dental indirect restorations from one dental composite blank, thereby providing an economical dental composite blank.

1 is a view of a hollow cylindrical mold according to an embodiment of the present invention.

2 is a view of a cylindrical mold.

3 is a view of a composite blank made in accordance with an embodiment of the present invention.

4 is a view of a composite blank prepared according to Comparative Example 1. FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

However, the following descriptions are not intended to limit the present invention to specific embodiments, and detailed descriptions of well-known techniques related to the present invention will be omitted when it is determined that the present invention may obscure the gist of the present invention. .

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, operation, component, or combination thereof described in the specification, and one or more other features or It should be understood that it does not exclude in advance the possibility of the presence or addition of numbers, steps, operations, components, or combinations thereof.

Hereinafter, the dental composite blank of the present invention will be described.

The dental composite blank of the present invention is made of a blank composition comprising at least one selected from a monomer comprising an unsaturated double bond and an oligomer comprising an unsaturated double bond, a filler, and a polymerization initiator, and comprising a hollow therein. It is shaped like a pillar.

The hollow polygonal pillars are hollow square pillars, hollow pentagonal pillars, hollow hexagonal pillars, hollow octagonal pillars, hollow octagonal pillars, hollow octagonal pillars, hollow octagonal pillars, hollow rim pillars and hollow twelve pillars. It may be any one selected from each pillar, and the hollow may be any one selected from a square pillar, a pentagonal pillar, a hexagonal pillar, a octagonal pillar, an octagonal pillar, a square pillar, a decagonal pillar, a shim pilgal pillar, and a twelve-octagonal pillar. It doesn't happen.

The hollow polygonal pillar may be preferably in the form of a washer.

The ratio (D / d) of the diameter (D) of the pillar to the diameter (d) of the hollow of the composite blank may vary depending on the field and purpose of use, but preferably 1 to 25, more preferably May be 5 to 20. In the case of more than 25, it may be difficult to manufacture the hollow columnar shape, and a difference in physical properties may occur depending on the processing position. If it is less than 1, there is no difference in physical properties depending on the difficulty of manufacturing and processing location, but the processing part may be reduced and economic efficiency may be reduced.

The ratio H / D of the height H to the diameter D of the hollow pillar may be greater than 0 and less than or equal to 20. Preferably greater than 0 and 10 or less, even more preferably greater than 0 and 5 or less.

In general, the composite blank may be prepared by curing the blank composition after filling the mold. At this time, by curing, shrinkage of 2 to 10% may occur. Due to the stress generated by the polymerization shrinkage, cracks may occur in the composite blank. This stress can be increased by the surface bonding force present on the surface of the blank composition and the mold. Therefore, the contact area between the blank composition and the mold can be minimized to prevent cracking of the composite blank. Since the blank composition is filled in the mold having an open top, the contact area is wider as the ratio (H / D) of the height (H) to the diameter (D) increases, so that the polymerization shrinkage stress may act. In the case of a cylindrical mold, when the ratio H / D of the height H to the diameter D is 2.5 or more, a difference in physical properties may occur between the restorations processed by internal cracking and self stress. On the other hand, in the case of a hollow columnar frame, no crack occurs when the ratio H / D of the height H to the diameter D is 20 or less, and there is no difference in physical properties between the processed restorations.

The composite blank may be obtained by molding and polymerizing the blank composition into a hollow pillar shape.

The content of at least one selected from monomers including the unsaturated double bonds and oligomers containing the unsaturated double bonds may vary depending on the field and purpose of use. The monomer including the unsaturated double bond and the oligomer including the unsaturated double bond play an important role in the degree of dispersion during polymerization of the blank composition, and may be an important factor for determining wear resistance and workability.

That is, when the content of the monomer and oligomer is less than 10% by weight based on the total weight of the blank composition, it may be difficult to form a polymer and may not be easily mixed with the filler. If the content of the monomer and oligomer is more than 40% by weight based on the total weight of the blank composition may be undesirable due to the increase in flowability. Therefore, at least one selected from the monomer including the unsaturated double bond and the oligomer containing the unsaturated double bond may be included in an amount of 10 to 40% by weight based on the total weight of the blank composition, and preferably 15 to 30% by weight. May be included.

When considering the content relationship between the monomer and the oligomer, the filler may be preferably included in 60 to 90% by weight, more preferably 65 to 85% by weight, even more preferably based on the total weight of the blank composition Preferably 70 to 80% by weight.

The polymerization initiator may be a photopolymerization initiator and a thermal polymerization initiator. In addition, according to the type of catalyst used in the polymerization reaction can be carried out in various ways, such as cation formation mechanism, anion formation mechanism, radical formation mechanism, etc., the double radical formation mechanism is most commonly used. Depending on the polymerization mechanism, the polymerization reaction can be carried out by photopolymerization reaction, thermal polymerization reaction and the like.

The photopolymerization reaction is performed by a photopolymerization initiator activated by visible light to initiate the polymerization of monomers, and the photopolymerization initiator is an α-diketone-based carbonyl compound photopolymerization initiator such as camphorquinone and acylphosphine oxide. A system photoinitiator etc. can be used.

The thermal polymerization initiator may be a peroxide system such as benzoyl peroxide, and radicals may be formed by heat to initiate polymerization.

Since the polymerization initiator for the polymerization reaction may be included in the composition within the range that does not affect the physical properties of the product while inducing the polymerization reaction, it may vary depending on the type and content of the other components of the composition and the type of catalyst.

The monomer including the unsaturated double bond may exhibit mechanical strength as a dental material, and any monomer can be used as long as it is polymerizable. Preferably, the monomer may be a methacrylate (MA) monomer.

The methacrylate monomers include 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 dimethacryl Glycerol phosphate dimethacrylate (GPDM). Preferably the methacrylate monomer is 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane (Bis-GMA), ethylene glycol dimethacrylate (TGDMA), ethoxylate bisphenol A dimethacrylate (Bis-EMA), urethane dimethacrylate (UDMA).

An inorganic filler, an organic filler, a stabilizer, etc. can be used for the said filler.

The inorganic filler may be synthetic amorphous silica, crystalline silica, barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, barium fluoroaluminoborosilicate Barium aluminoborosilicate, strontium silicate, strontium borosilicate, strontium aluminoborosilicate, calcium silicate, calcium silicate, alumino borosilicate alumino silicate, silicon nitrides, titanium dioxide, calcium hydroxy apatite, zirconia, and bioactive glass may be used.

The barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, barium aluminoborosilicate, strontium silicate, strontium silicate Borosilicate and strontium aluminoborosilicate are in the form of particles, the diameter of the particles may be 0.2-3 μm, preferably 0.3-2 μm, more preferably 0.4-0.4 1 μm. If the diameter of the particles is smaller than 0.2 μm, uniform dispersion in the composition may be difficult due to cohesion between the particles, and bubbles may be difficult to remove and work by increasing the viscosity. On the other hand, when it is larger than 3 μm, the bond strength and physical property decrease rapidly as the ratio (H / D) of the height (H) to the diameter (D) increases, and large particles are lost due to abrasion after application to the teeth. Thus, lubrication can be reduced.

The synthetic amorphous silica, crystalline silica and zirconia are in the form of particles, the diameter of the particles may be 5 to 100 nm, preferably 6 to 50 nm, more preferably Preferably 7 to 20 nm.

In general, since the inorganic filler is hydrophilic, it is incompatible with the hydrophobic methacrylate-based monomer, and thus the affinity with the monomer may be enhanced by including a binder component or by surface treating the inorganic filler with a silane coupling agent.

The organic filler is prepared in the form of a powder after synthesizing a monomer containing an unsaturated double bond or a monomer compatible with the monomer in the dental restorative composition by bulk polymerization, emulsion polymerization, suspension polymerization, or the like. The particle | grains which made the average particle diameter into 0.005-100 micrometers can be used. In some cases, without adding an inorganic or organic filler, instead of increasing the curing molecular weight of the monomer containing the unsaturated double bond may increase the mechanical strength.

The size of the particles used in the blank composition may preferably be 5 to 3,000 nm. In general, dental composite blanks may require physical properties of more than 200 Mpa of biaxial strength and 400 Mpa of compressive strength that can be bridged. When particles having a size of more than 3000 nm are used, the wear and processing time of the instrument during CAM processing may increase, and surface polishing may be difficult. In addition, when particles having a size of less than 5 nm are used, the viscosity of the blank composition becomes high, which makes it difficult to remove bubbles and difficult to process the composite blank.

The stabilizer is preferably a phenol-based, phosphate-based stabilizer and the like.

Other known compounds may be added to the blank composition within a range that does not inhibit the effects of the invention. Therefore, polymerization inhibitors, antioxidants, colorants, fluorescent agents, fluorine additives, stabilizers and the like may be added.

The dental composite blank may have a diameter D of 10 to 110 mm, preferably 30 to 110 mm, a height H of 5 to 20 mm, and a hollow diameter d of 5.5 to 20 mm. However, it is not limited thereto. The diameter (D), height (H) of the composite blank and the diameter (d) of the hollow can be formed in various ways depending on the field of use and purpose.

The dental composite blank may be made of a bridge. A bridge is a restoration that is installed so that the function of a tooth is completely impaired and the load of the deleted tooth is compensated for by the teeth on both sides. In general, the molar size of an adult is 10 mm and 10 mm in length and height, respectively, The length may be at least about 30 mm. In addition, in order to manufacture a plurality of restorations in one process, the height (H) is preferably 5 mm or more, and the diameter (D) is preferably 10 mm or more, and the diameter (D) for ease of processing in commercially available CAD / CAM equipment. It may be desirable that this is 10 mm or more and 110 mm or less.

Hereinafter, the manufacturing method of the composite blank of the present invention.

First, a blank composition comprising at least one selected from a monomer comprising an unsaturated double bond and an oligomer comprising an unsaturated double bond, a filler, and a polymerization initiator is prepared (step a).

The detailed content of the blank composition of step (a) is consistent with the description of the blank composition described above, so reference is made here.

After step (a) may include removing the bubbles of the blank, but is not limited thereto.

Next, referring to FIG. 1, the blank composition is filled in a mold in the form of a hollow pillar (step b).

The mold may be any one selected from a hollow cylinder, a hollow elliptic cylinder, and a hollow polygonal cylinder as in the form of the dental composite blank described above, and the hollow may be any one selected from a cylinder, an elliptic cylinder, and a polygonal cylinder. have.

The hollow polygonal pillars are hollow square pillars, hollow pentagonal pillars, hollow hexagonal pillars, hollow octagonal pillars, hollow octagonal pillars, hollow octagonal pillars, hollow octagonal pillars, hollow rim pillars and hollow twelve pillars. It may be any one selected from each pillar, and the hollow may be any one selected from a square pillar, a pentagonal pillar, a hexagonal pillar, a octagonal pillar, an octagonal pillar, a square pillar, a decagonal pillar, a shim pilgal pillar, and a twelve octagonal pillar.

The hollow columnar shape may preferably be in the form of a washer.

After step (b) may further comprise the step (b ') of removing the bubbles of the blank composition.

Step (b ') may be preferably performed by a centrifuge, but is not limited thereto.

Finally, the composition filled in the mold is polymerized and molded into a hollow columnar composite blank to prepare a dental composite blank (step c).

The polymerization may be performed by a photopolymerization reaction or a thermal polymerization reaction.

The photopolymerization reaction is a radical polymerization reaction of a monomer that is initiated and activated by light, and the thermal polymerization reaction is a radical polymerization reaction in which radicals are formed by heat.

Since the initiator and reaction mechanism of the photopolymerization reaction or the thermal polymerization reaction are consistent with the description of the polymerization initiator described above, it is referred to this.

EXAMPLE

Preparation Example 1 Preparation of Blank Composition

A blank composition was prepared in the composition of Table 1 below.

Table 1

ingredient	Content (parts by weight)
2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane (Bis-GMA)	8.2
Triethylene Glycol Dimethacrylate (TEGDMA)	5.0
Ethoxylate Bisphenol A Dimethacrylate (Bis-EMA)	5.0
Urethane Dimethacrylate (UDMA)	5.0
Barium Aluminosilicate (D50 Size: 1 ㎛)	70.0
Amorphous synthetic silica	5.0
Phenolic and Phosphite Mixing Stabilizers	0.1
Polymerization Inhibitor (Butylhydroxy Toluene)	0.1
Camper Quinone	0.3
Ethyl 4- (N, N-dimethylamino) benzoate	0.7
Benzoyl peroxide	0.5
Pigments and fluorescent agents	0.1

Example 1 Preparation of Composite Blanks

Referring to FIG. 1, the composition prepared in Preparation Example 1 was a washer of diameter (D) of 110 mm, height (H) of 5 mm (H / D = 0.09) and hollow diameter (d) of 20 mm. The hollow cylindrical mold (D / d = 5.5) was filled and centrifuged at 2500 rpm for 1 hour to remove bubbles. Thereafter, photopolymerization was performed at 50,000 lux for about 5 minutes to prepare a composite blank of washer type in the form of a hollow cylinder.

Example 2: Preparation of Composite Blanks

Instead of washer-type hollow cylindrical mold (D / d = 5.5) with a diameter (D) of 110 mm and a height (H) of 5 mm (H / D = 0.09) and a hollow diameter (d) of 20 mm Except for using a washer-type hollow cylindrical mold (D / d = 20) with (D) 110 mm, height (H) 5 mm (H / D = 0.09), and hollow diameter (d) 5.5 mm In the same manner as in Example 1 was prepared a composite blank washer-shaped hollow cylinder.

Example 3: Preparation of Composite Blanks

Instead of washer-type hollow cylindrical mold (D / d = 5.5) with a diameter (D) of 110 mm and a height (H) of 5 mm (H / D = 0.09) and a hollow diameter (d) of 20 mm Using a washer-type hollow cylindrical mold (D / d = 25) with (D) 110 mm, height (H) 5 mm (H / D = 0.09), and hollow diameter (d) 4.4 mm Except for the hollow cylindrical cylindrical washer composite blank was prepared in the same manner as in Example 1.

Comparative Example 1: Preparation of Composite Blank

Referring to FIG. 2, a hollow cylindrical mold (D / d) having a diameter (D) of 110 mm, a height (H) of 5 mm (H / D = 0.09), and a hollow diameter (d) of 20 mm = 5.5), instead of using a cylindrical mold having a diameter D of 110 mm and a height H of 5 mm (H / D = 0.09), the disc-shaped composite having the cylindrical shape in the same manner as in Example 1 Blanks were prepared.

[Test Example]

Crack Initiation and Property Measurement of Composite Blanks

It was confirmed the presence of cracks for the composite blank prepared according to Examples 1 to 3 and Comparative Example 1. In addition, the outer periphery (5 mm from the outer circumference of the composite blank), the middle periphery (20 mm from the outer circumferential surface of the composite blank), and the central part (35 mm from the outer circumferential surface of the composite blank) are cut and machined, respectively. Intensity is an average value measured five times in accordance with the ISO 6872: 2008 standards are shown in Table 2, the beaker hardness (Vickers hardness) is the average value measured five times according to the method of Journal of Biomedical Optics , Volume 9, Pages 601-608 It is shown in Table 2 below.

TABLE 2

division	Example 1			Example 2			Example 3			Comparative Example 1
Measuring position of blank	suburb	middle	center	suburb	middle	center	suburb	middle	center	suburb	middle	center
Crack	X	X	X	X	X	X	X	X	X	Ο	X	X
Flexural Strength (MPa)	233	234	241	214	221	224	219	198	176	208	193	176
Vickers Hardness (Hv)	93	96	96	91	92	96	91	87	84	79	72	65

Referring to Table 2, the composite blank prepared according to Comparative Example 1 was found to have some cracks in the outer, the composite blanks prepared according to Examples 1 to 3 was found that no cracks.

Composite blanks of Comparative Example 1 showed lower flexural strength and Vickers hardness than Examples 1-3. In addition, compared with Examples 1 to 3, the composite blank of Comparative Example 1 was also found to have a large difference in physical properties at each position of the outside, the middle, and the center.

Therefore, it was found that the composite blanks prepared according to Examples 1 to 3 in the form of hollow pillars did not generate cracks, exhibited better physical properties than Comparative Example 1, and also had small differences in physical properties between respective positions.

Claims

In the dental composite blank,

The dental composite blank is at least one selected from monomers containing unsaturated double bonds and oligomers containing unsaturated double bonds; filler; And it is made of a blank composition comprising a polymerization initiator,

The dental composite blank is a dental composite blank in the form of a hollow pillar including a hollow therein.
The method of claim 1,

The hollow pillar is any one selected from a hollow cylinder, a hollow elliptic cylinder and a hollow polygonal cylinder, and the hollow composite blank characterized in that any one selected from a cylinder, an elliptic cylinder and a polygonal cylinder.
The method of claim 2,

The hollow polygonal pillar, the hollow square pillar, the hollow pentagonal pillar, the hollow hexagonal pillar, the hollow octagonal pillar, the hollow octagonal pillar, the hollow octagonal pillar, the hollow octagonal pillar, the hollow rim pillar and the hollow twelve. Any one selected from each column,

Dental composite blank, characterized in that the hollow is any one selected from a pillar, a pentagonal pillar, a hexagonal pillar, a octagonal pillar, an octagonal pillar, a octagonal pillar, a decagonal pillar, a rim pillar and a twelfth pillar.
The method of claim 1,

The hollow pillar shape is a dental composite blank, characterized in that the washer (washer) form.
The method of claim 1,

Dental composite blank, characterized in that the ratio (D / d) of the diameter (D) of the pillar to the diameter (d) of the hollow.
The method of claim 1,

Dental composite blank, characterized in that the ratio (D / d) of the diameter (D) of the pillar to the diameter (d) of the hollow.
The method of claim 1,

The dental composite blank is a composite composite blank, characterized in that the blank composition by molding (molding) the blank composition in the form of a hollow column.
The method of claim 1,

The blank composition is at least one 100 parts by weight selected from monomers including unsaturated double bonds and oligomers containing unsaturated double bonds; 0.001 to 5 parts by weight of a polymerization initiator; And fillers 40 to 900 parts by weight; dental composite blank comprising a.
The method of claim 1,

Wherein said polymerization initiator comprises at least one selected from a photopolymerization initiator and a thermal polymerization initiator.
The method of claim 1,

The monomer comprising the unsaturated double bond is a dental composite blank, characterized in that the methacrylate (MA) monomer.
The method of claim 10,

The methacrylate monomers include 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 dimethacryl Dental composite blanks, characterized in that at least one selected from glycerol phosphate dimethacrylate (GPDM).
The method of claim 11,

The methacrylate monomers include 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane (Bis-GMA), ethylene glycol dimethacrylate (TGDMA) And a composite of ethoxylate bisphenol A dimethacrylate (Bis-EMA), and urethane dimethacrylate (UDMA).
The method of claim 1,

The filler is a composite composite blank, characterized in that it comprises at least one selected from inorganic fillers and organic fillers.
The method of claim 13,

The inorganic filler may be synthetic amorphous silica, crystalline silica, barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, barium fluoroaluminoborosilicate Barium aluminoborosilicate, strontium silicate, strontium borosilicate, strontium aluminoborosilicate, calcium silicate, calcium silicate, alumino borosilicate at least one selected from alumino silicate, silicon nitrides, titanium dioxide, calcium hydroxy apatite, zirconia, and bioactive glass. Dental composite blanks.
The method of claim 14,

Barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, barium aluminoborosilicate, strontium silicate, strontium silicate Silicate (strontium borosilicate), and strontium aluminoborosilicate (strontium aluminoborosilicate) is in the form of particles, the size of the particle (dental) composite composite blank, characterized in that 0.2 to 3㎛.
The method of claim 14,

And wherein the synthetic amorphous silica, crystalline silica, and zirconia are in the form of particles, and the size of the particles is 5 to 100 nm.
The method of claim 1,

The dental composite blank is a dental composite blank, characterized in that the diameter (D) of the hollow pillar is 10 to 110 mm, the diameter (d) of the hollow is 5.5 to 20 mm.
At least one selected from monomers containing unsaturated double bonds and oligomers containing unsaturated double bonds; filler; And (a) preparing a blank composition comprising a polymerization initiator;

(B) filling the blank composition into a mold in the form of a hollow column; And

(C) polymerizing the composition filled in the mold to form a composite blank in the form of a hollow column;

Method for producing a dental composite blank comprising.
The method of claim 18,

Method for producing the dental composite blank

And removing the air bubbles of the blank composition filled in the mold in the form of the hollow pillar after the step (b).