KR101613097B1 - Hollow column typed-composite blank for dental indirect restoration - Google Patents

Abstract

The present invention is characterized in that at least one selected from the group consisting of a monomer containing an unsaturated double bond and an oligomer of a monomer containing an unsaturated double bond; filler; And a polymerization initiator, and is in the form of a hollow column having a cavity therein. The dental composite blank according to the present invention has uniform and excellent physical properties irrespective of its position, has no cracks, and can use a single dental composite blank to produce a plurality of indirect restorations.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a composite hollow blank for dental indirect restoration,

More particularly, the present invention relates to a hollow-column-shaped dental composite blank having uniform physical properties and excellent physical properties without cracks.

Patients who are presently suffering from impaired or defective teeth are subjected to dental restorations or prosthetic procedures, as well as masticatory and aesthetic treatments. According to the procedure, dental restoration can be divided into direct repair and indirect repair. Direct recipes are used for small areas where oral restoration is possible, and curing methods use chemical hardening and photocuring. A variety of materials and curing methods can be used to manufacture representative prostheses for indirect dental implants.

Dental restorative materials used in dental restorative procedures include tooth restorations caused by dental caries or fractures, general dental procedures for restoring the entire crown, fixing dentures, and a wide range of dental restorations and aesthetic dental treatments. It is one of the core dental materials used throughout.

In order to minimize the adverse effects of tooth loss, the dental prosthesis is an artificial tooth such as a fixed prosthesis (crown, bridge) or a removable prosthesis (a prosthesis that can be inserted or removed into the mouth, a denture or a partial denture) To produce a substitute. Dental prostheses are usually customized and used as replacements for tooth structures.

Typical dental restorations include restorations, fillers, inlays, onlays, veneers, full and partial crowns, bridges, implants, posts, etc. . The prosthesis is made by a professional dentist, either by hand, or by a technician who is a well-trained professional manufacturer in a laboratory.

Traditional dental prosthesis manufacturing procedures require a minimum of two dental visits to the patient. Impression on teeth and dentition as a rubbery product on first visit. The prosthesis is then made of metal, ceramic or composite material, and is then comfortably aligned to conform to the patient's oral condition after completion of the fabrication. Such a dental prosthesis manufacturing period takes one to two days or more, and since the dental prosthesis is manufactured by the manual work of the technician, high skill and skill are required.

Due to recent developments in technology, the period of manual work and the period of dental prosthesis production has been reduced by introducing computerized automation equipment such as optics, digitalization device, mechanical milling machine and CAD / CAM. Such computerized automation equipment produces dental prostheses by cutting, milling and grinding the necessary restorations to the correct shape and shape at a faster rate and lower workload than conventional manual methods. The CAD / CAM devices are available from Ce.novation (Inocermic, Germany), Ceron (Degudent, Germany), Cerec 3D (Sirona, Germany), Cerec InLab (Sirona, Germany), Decim (Cad.esthetcs, Germany), Medfacturing (Bego Medical, Germany), Ekton (Germany), Everest (Kavo, Germany), Evolution 4D (D4D Technologies, USA) ), Pricident DCS (DCS, Switzerland), Perfactory (DeltaMed, Germany), Procera Biocare, Sweden), Pro 50 (Cynovad, Canada), Wol-Cram -CAM (ZFN, Germany), ZirkonZahn (Steger, Italy).

Dental prostheses using CAD / CAM devices typically use a solid blank, a material that is the material from which the prosthesis is cut or sculpted. The mill blank is typically made of a ceramic material. VITA CELAY (TM) porcelain blank, VITA Mark II Vitablocks ™ and VITA IN-CERAM ™ ceramic blanks (Vita Zahn, Fabrik), which are commercially available. Machinable mica ceramic blanks (e.g., Corning MACOR (TM) Blank and Dentsply DICOR (TM) Blank) are also commercially available.

In this connection, US Published Patent Application No. 2003-0031984 discloses a ceramic dental mill blanks. The ceramic dental mill blanks are mill blanks used in CAD / CAM because of their very hard material, which has the disadvantage of excessive wear of the tool and prolonged dental prosthesis manufacturing time, and excessive wear of the tool The production cost is relatively high.

U.S. Patent No. 6,899,948 discloses dental materials with enhanced visual opacity and mechanical strength by applying nano-sized silica particles. However, when nanosized silica particles having an average size of 200 nm or less are applied, there is a disadvantage that the dental composition lacks rheological properties.

U.S. Patent No. 7,255,562 discloses a dental blank blank comprising a polymeric resin matrix and a filler. The dental blank blank has excellent cuttability and hardness, which inhibits the generation of cracks during the production of the mill blank. However, cracks are still generated when a blank having a large height is produced. Because it did not control its own stress on polymerization shrinkage by photocuring.

Usually, the direction of polymerization shrinkage is toward the center of gravity of self-polymerization type and toward the direction of light source of light-curing type. Since the van der Waals interactions between the monomers before polymerization are converted into strong covalent bonds through polymerization, a certain amount of shrinkage will necessarily occur. Since the force due to the shrinkage is very strong, the blank margins and cracks in the material itself occur.

In the self-curing type, there is a shrinking stress buffering effect due to the bubbles contained in the mixing process of the composite paste, and since the gel point of the composite paste is not as abrupt as the photopolymerization, Cracks are less generated, but overall physical properties are much lower than photopolymerization.

In the case of the photopolymerization type, the total energy required for polymerization is regarded as the product of the intensity of light and time, which is polymerized in proportion to this amount. As a result, if rapid curing affects shrinkage, it will be necessary to polymerize for a long time with weak light to reduce the stress of polymerization shrinkage. Methods based on this principle have been proposed in which the intensity of light is relatively weakly investigated so that the self-curing of mil-blanks progresses slowly, as in autopolymerization, and a method of delaying the complete curing of the mill blank and temporarily weak binding or curing Followed by induction and waiting for a certain period of time. This is also described in U.S. Patent No. 7,255,562. However, since light is not transferred to the interior of a large size blank blank, an uncured portion occurs and the cracking rate can not be lowered.

Therefore, there is a need to develop a dental composite blank that does not cause a difference in physical properties between the processed prosthesis without cracks.

An object of the present invention is to provide a dental composite blank in which physical properties are uniform and excellent, and cracks are not generated.

Another object of the present invention is to provide a dental composite blank in which a plurality of indirect restorations have uniform physical properties when manufacturing a plurality of indirect restorations in the hollow dental composite blank.

Another object of the present invention is to provide a dental composite blank in which a plurality of dental indirect restorations can be manufactured from one dental composite blank.

According to an aspect of the present invention,

In a dental composite blank,

Wherein the dental composite blank comprises at least one selected from the group consisting of an unsaturated double bond-containing monomer and an unsaturated double bond-containing monomer; filler; And a polymerization initiator,

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

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

The hollow prismatic column has a hollow square column, a hollow pentagonal prism, a hollow hexagonal prism, a hollow prismatic prism, a hollow prism column, a hollow prismatic prism, a hollow prismatic prism, a hollow prismatic prism, Any one selected from each column,

The hollow may be any one selected from the group consisting of a square pillar, a pentagonal prism, a hexagonal pillar, a pentagonal prism, an octagonal pillar, a sphere prism, a prismatic prism, a prismatic prism, and a twelve prism.

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

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

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

The dental composite blank may be a polymer obtained by molding the blank composition into a hollow column shape.

Wherein the blank composition comprises at least 100 parts by weight of at least one selected from the group consisting of unsaturated double bonds-containing monomers and unsaturated double bonds-containing monomer oligomers; 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 containing the unsaturated double bond may be a methacrylate (MA) -based monomer.

The methacrylate monomer may be selected from the group consisting of 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane (Bis-GMA), ethylene glycol dimethacrylate (EGDMA) , Triethylene glycol dimethacrylate (TEGDMA), ethoxylate bisphenol A dimethacrylate (Bis-EMA), urethane dimethacrylate (UDMA), dipentaerythritol pentaacrylate (dipentaerythritol pentaacrylate monophosphate (PENTA), 2-hydrozyethyl methacrylate (HEMA), polyalkenic acid, biphenyl dimethacrylate (BPDM), and glycerol phosphate dimethacrylate And glycerol phosphate dimethacrylate (GPDM).

The methacrylate monomer may be selected from the group consisting of 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane (Bis-GMA), ethylene glycol dimethacrylate (EGDMA) , Ethoxylate bisphenol A dimethacrylate (Bis-EMA), and urethane dimethacrylate (UDMA).

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

The inorganic filler may be selected from the group consisting of synthetic amorphous silica, crystalline silica, barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, Barium aluminoborosilicate, strontium silicate, strontium borosilicate, strontium aluminoborosilicate, calcium silicate, aluminosilicate (also referred to as " and may include at least one selected from alumino silicate, silicon nitrides, titanium dioxide, calcium hydroxyapatite, zirconia, and bioactive glass. .

A barium silicate, a barium borosilicate, a barium fluoroaluminoborosilicate, a barium aluminoborosilicate, a strontium silicate, a strontium borate, Strontium borosilicate, and strontium aluminoborosilicate are in the form of particles, and the size of the particles may be 0.2 to 3 탆.

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.

According to another aspect of the present invention,

At least one selected from the group consisting of a monomer containing an unsaturated double bond and an oligomer of a monomer containing an unsaturated double bond; filler; And a polymerization initiator; (a) preparing a blank composition comprising:

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

(C) polymerizing the composition filled in the mold and molding it into a composite blank in the form of a hollow column;

A method of making a dental composite blank is provided.

The method of making the dental composite blank

(B ') of bubbling the blank composition filled in the mold in the form of a hollow column after said step (b).

According to the present invention, it is possible to provide a dental composite blank in which physical properties are uniform and excellent, and cracks are not generated.

According to the present invention, in the dental composite blank molded in the form of a hollow column, it is possible to provide a dental composite blank in which a plurality of indirect restorations have uniform physical properties when manufacturing a plurality of indirect restorations.

According to the present invention, it is possible to provide a dental composite blank capable of manufacturing 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 photograph of a composite blank manufactured according to an embodiment of the present invention.
4 is a photograph of a composite blank produced according to Comparative Example 1. Fig.

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

However, the following description does not limit the present invention to specific embodiments. In the following description of the present invention, detailed description of related arts will be omitted if it is determined that the gist of the present invention may be blurred .

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises ",or" having ", and the like, specify that the presence of stated features, integers, steps, operations, elements, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, 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 containing an unsaturated double bond and an oligomer of a monomer containing an unsaturated double bond, a filler, and a polymerization initiator, Which is a hollow columnar shape.

The hollow column may be any one selected from a hollow cylindrical column, a hollow elliptic column, and a hollow polygonal column, and the hollow may be any one selected from a cylinder, an elliptical column, and a polygonal column.

 The hollow prismatic column has a hollow square column, a hollow pentagonal prism, a hollow hexagonal column, a hollow prism column, a hollow octagonal column, a hollow prismatic prism, a hollow prismatic column, a hollow prismatic column, And the hollow may be any one selected from a quadrangular prism, an oval prism, a hexagonal prism, a prismatic prism, an octagonal prism, a spherical prism, a prismatic prism, a core prismatic prism, and a twin prism prism, It is not.

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

The ratio (D / d) of the diameter (D) of the column to the hollow diameter (d) of the composite blank may vary depending on the application field and purpose, but may be preferably 1 to 25, May be from 5 to 20. If it is more than 25, it may be difficult to produce a hollow columnar shape and there may be a difference in physical properties depending on the processing position. If it is less than 1, there is no difference in the physical properties depending on the difficulty of manufacture and the processing position, but the processing part may be reduced and the economical efficiency may be lowered.

The ratio H / D of the height H to the diameter D of the hollow column may be more than 0 and less than or equal to 20. Preferably not less than 0 and not more than 10, even more preferably not less than 0 and not more than 5.

In general, composite blanks can be prepared by filling the blank composition into a mold and then curing. At this time, shrinkage of 2 to 10% can be caused by curing. Cracks can occur in the composite blank due to the stress generated by such polymerization shrinkage. This stress can be increased by the surface bonding force existing on the surfaces of the blank composition and the mold. Therefore, it is possible to minimize the contact area between the blank composition and the mold frame, thereby preventing cracking of the composite blank. Since the blank composition is filled in the mold with the top opened, the larger the ratio (H / D) of the height (H) to the diameter (D), the wider the contact area becomes, so that the polymerization shrinkage stress can greatly act. In the case of a cylindrical form, when the ratio (H / D) of the height (H) to the diameter (D) is 2.5 or more, differences in physical properties may occur between restorations processed by internal cracking and self-stress. On the other hand, in the case of the hollow columnar mold, 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 the physical properties between the processed restorations.

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

Wherein the blank composition comprises at least 100 parts by weight of at least one selected from the group consisting of unsaturated double bonds-containing monomers and unsaturated double bonds-containing monomer oligomers; 0.001 to 5 parts by weight of a polymerization initiator; And 40 to 900 parts by weight of a filler.

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

That is, when the content of the oligomers of the monomer and the monomer is as small as less than 10% by weight based on the total weight of the blank composition, it is difficult to form a polymer and mixing with a filler may not be easy. If the content of oligomers of the monomers and monomers is more than 40% by weight based on the total weight of the blank composition, it may be undesirable because of increased flowability. Accordingly, at least one selected from the monomers including an unsaturated double bond and oligomers of a monomer containing an unsaturated double bond may be contained in an amount of 10 to 40% by weight based on the total weight of the blank composition, and preferably 15 to 30% %. ≪ / RTI >

The filler may be contained in an amount of 60 to 90% by weight, more preferably 65 to 85% by weight based on the total weight of the blank composition, More preferably from 70 to 80% by weight.

The polymerization initiator may be a photopolymerization initiator and a thermal polymerization initiator. In addition, depending on the kind of the catalyst used in the polymerization reaction, various formation methods such as cation formation mechanism, anion formation mechanism, radical formation mechanism and the like can be performed, and double radical formation mechanism is most commonly used. Depending on the polymerization mechanism, the polymerization reaction may be carried out by a photopolymerization reaction, a thermal polymerization reaction or the like.

Wherein the photopolymerization reaction is carried out by a photopolymerization initiator that is activated by visible light and initiates polymerization of the monomer, wherein the photopolymerization initiator is selected from the group consisting of a carbonyl compound photopolymerization initiator of an? -Diketone system such as camphorquinone and acylphosphine oxide Based photopolymerization initiator and the like can be used.

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

The polymerization initiator for such a polymerization reaction may be included in the composition within a range that does not affect the physical properties of the product while inducing a polymerization reaction, and thus may be varied depending on the kind and content of other components of the composition and the type of the catalyst.

The monomer containing the unsaturated double bond may be any polymerizable monomer capable of exhibiting mechanical strength as a dental material, and may preferably be a methacrylate (MA) monomer.

The methacrylate monomer may be selected from the group consisting of 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane (Bis-GMA), ethylene glycol dimethacrylate (EGDMA) , Triethylene glycol dimethacrylate (TEGDMA), ethoxylate bisphenol A dimethacrylate (Bis-EMA), urethane dimethacrylate (UDMA), dipentaerythritol pentaacrylate (dipentaerythritol pentaacrylate monophosphate (PENTA), 2-hydrozyethyl methacrylate (HEMA), polyalkenic acid, biphenyl dimethacrylate (BPDM), and glycerol phosphate dimethacrylate Glycerol phosphate dimethacrylate (GPDM), or the like may be used. Preferably, the methacrylate monomer is selected from the group consisting of 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane (Bis-GMA), ethylene glycol dimethacrylate (EGDMA), ethoxylate bisphenol A dimethacrylate (Bis-EMA), urethane dimethacrylate (UDMA).

The filler may be an inorganic filler, an organic filler, a stabilizer, or the like.

The inorganic filler may be selected from the group consisting of synthetic amorphous silica, crystalline silica, barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, Barium aluminoborosilicate, strontium silicate, strontium borosilicate, strontium aluminoborosilicate, calcium silicate, aluminosilicate (also referred to as " alumino silicate, silicon nitrides, titanium dioxide, calcium hydroxyapatite, zirconia, and bioactive glass may be used.

The barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, barium aluminoborosilicate, strontium silicate, strontium silicate, barium silicate, Strontium borosilicate and strontium aluminoborosilicate are in the form of particles and the diameter of the particles can be from 0.2 to 3 mu m, preferably from 0.3 to 2 mu m, more preferably from 0.4 to 2 mu m, Lt; / RTI > If the diameter of the particles is less than 0.2 탆, uniform dispersion in the composition may be difficult due to the cohesive force between the particles, and removal of bubbles and work may be difficult due to viscosity increase. On the other hand, when the diameter is larger than 3 탆, the bond strength and physical properties are rapidly decreased as the ratio (H / D) to the diameter (D) increases, So that the degree of 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, Lt; RTI ID = 0.0 > nm. ≪ / RTI >

In general, since the inorganic filler is hydrophilic, the compatibility with the hydrophobic methacrylate monomer is lowered. Therefore, the inorganic filler can include a binder component, or the inorganic filler can be surface-treated with a silane coupling agent to enhance affinity with the monomer.

The organic filler is prepared by synthesizing a monomer containing an unsaturated double bond or a monomer having compatibility with a monomer constituting the matrix after polymerization in a dental restorative composition by bulk polymerization, emulsion polymerization or suspension polymerization, By weight and having an average particle diameter of 0.005 to 100 탆 can be used. In some cases, it is possible to increase the mechanical strength by increasing the curing molecular weight of the monomer containing the unsaturated double bond without adding an inorganic or organic filler.

The size of the particles used in the blank composition may preferably be from 5 to 3,000 nm. Typically, dental composite blanks may require more than 200 MPa of biaxial strength, capable of bridging, and physical properties of greater than 400 MPa. In the case of using particles having a size exceeding 3000 nm, wear of the mechanism and processing time are increased during CAM processing, 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, so that removal of bubbles is difficult and processing of the composite blank may be difficult.

The stabilizer is preferably a phenol-based or phosphate-based stabilizer.

Other known compounds may be added to the blank composition to the extent that the effect of the invention is not impaired. Therefore, a polymerization inhibitor, an antioxidant, a colorant, a fluorescent agent, a fluorine additive, a stabilizer, and the like may be added.

The dental composite blank may have a column 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, the present invention is not limited thereto. The diameter (D), the height (H) and the diameter (d) of the composite blank may be variously formed according to the application field and purpose.

The dental composite blank may be capable of making bridges. The bridge is a restoration that is completely restrained by the function of the teeth and is installed so that the load of the deleted tooth is compensated by both lateral teeth. Usually, the adult molar size is 10 mm and 10 mm in length and height, The length may be at least about 30 mm. In order to manufacture a plurality of restorations by machining one time, it is preferable that the height H is 5 mm or more and the diameter D is 10 mm or more. In order to facilitate the processing in a commercialized CAD / CAM machine, May be preferably 10 mm or more and 110 mm or less.

Hereinafter, a method for producing the composite blank of the present invention will be described.

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

The detailed contents of the blank composition of step (a) are consistent with the description of the blank composition described above, so this will be referred to.

Removing the bubbles of the blank after step (a), but is not limited thereto.

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

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

The hollow prismatic column has a hollow square column, a hollow pentagonal prism, a hollow hexagonal column, a hollow prism column, a hollow octagonal column, a hollow prismatic prism, a hollow prismatic column, a hollow prismatic column, And the hollow may be any one selected from a quadrangular prism, an oval prism, a hexagonal prism, a prismatic prism, an octagonal prism, a spherical prism, a prismatic prism, a corrugated prism, and a twin prism.

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

(B ') of bubbling the blank composition after step (b).

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

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

The polymerization may be carried out by a photopolymerization reaction or a thermal polymerization reaction.

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

The initiator and the reaction mechanism of the photopolymerization reaction or the thermal polymerization reaction coincide with the description of the polymerization initiator described above, so that reference will be made thereto.

[Example]

Manufacturing example  1: Preparation of blank composition

Blank compositions were prepared with the compositions shown in Table 1 below.

ingredient Content (parts by weight) Methacryloyloxypropoxy) phenyl) propane (Bis-GMA), 2,2-bis- (4- 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 mu m) 70.0 Amorphous synthetic silica 5.0 Phenolic and phosphite-based mixed stabilizers 0.1 Polymerization inhibitor (butylhydroxytoluene) 0.1 Camphorquinone 0.3 Ethyl 4- (N, N-dimethylamino) benzoate 0.7 Benzoyl peroxide 0.5 Dyes and fluorescent agents 0.1

Example  One: Composite  Manufacture of Blank

Referring to FIG. 1, the composition prepared in Preparation Example 1 was shaped into a washer-shaped body 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 Bubbles were removed by filling the hollow cylindrical mold (D / d = 5.5) and centrifuging at 2500 rpm for 1 hour. Thereafter, light curing was performed at 50,000 lux for about 5 minutes to prepare a hollow cylindrical washer-type composite blank.

Example  2: Composite  Manufacture of Blank

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

Example  3: Composite  Manufacture of Blank

Instead of a washer-shaped hollow cylindrical mold (D / d = 5.5) 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 (D / d = 25) with a washer-type hollow cylindrical mold (D / D) of 110 mm, a height H of 5 mm (H / D = 0.09) and a hollow diameter A hollow cylindrical washer-shaped composite blank was produced in the same manner as in Example 1. [

Comparative Example  One: Composite  Manufacture of Blank

2, a washer-shaped 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 Except that a cylindrical mold having a diameter (D) of 110 mm and a height (H) of 5 mm (H / D = 0.09) was used in place of the cylindrical mold A blank was prepared.

[Test Example]

Composite  Blank crack  Occurrence and property measurement

The presence of cracks in the composite blanks prepared according to Examples 1 to 3 and Comparative Example 1 was confirmed. Further, cutting and machining were performed on the outer periphery (5 mm away from the outer periphery of the composite blank), the middle (20 mm away from the outer periphery of the composite blank) and the center (35 mm away from the outer periphery of the composite blank) The strengths are shown in Table 2 below, and the Vickers hardness is measured in the Journal of Biomedical Optics , Volume 9, Pages 601-608 are shown in Table 2 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Measuring position of the blank suburb middle center suburb middle center suburb middle center suburb middle center Cracking X X X X X X X X X O 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, it can be seen that the composite blank produced according to Comparative Example 1 generated some cracks at the outer periphery, and that the composite blank produced according to Examples 1 to 3 did not crack.

The flexural strength and Vickers hardness of the composite blank of Comparative Example 1 were lower than those of Examples 1 to 3. In addition, compared with Examples 1 to 3, the composite blank of Comparative Example 1 showed a large difference in physical properties at the outer, middle, and central positions.

Thus, it was found that the composite blank prepared according to Examples 1 to 3 in the form of a hollow column had no cracks, exhibited excellent physical properties as compared with Comparative Example 1, and had little difference in physical properties between respective positions.

Claims (19)

In a dental composite blank,
Wherein the dental composite blank comprises at least one selected from the group consisting of an unsaturated double bond-containing monomer and an unsaturated double bond-containing monomer; filler; And a polymerization initiator,
The dental composite blank is in the form of a hollow column having a hollow interior therein. The method according to claim 1,
Wherein the hollow column is selected from the group consisting of a hollow cylinder, a hollow ellipsoidal column, and a hollow polygonal column, and the hollow is any one selected from a cylinder, an ellipse column, and a polygonal column. 3. The method of claim 2,
The hollow prismatic column has a hollow square column, a hollow pentagonal prism, a hollow hexagonal prism, a hollow prismatic prism, a hollow prism column, a hollow prismatic prism, a hollow prismatic prism, a hollow prismatic prism, Any one selected from each column,
Wherein the hollow is any one selected from the group consisting of a quadrangular prism, an oval prism, a hexagonal prism, a prismatic prism, an octagonal prism, a spherical prism, a prismatic prism, a prismatic prism, and a twelve prismatic prism. The method according to claim 1,
Wherein said hollow post is in the form of a washer. The method according to claim 1,
Wherein a ratio (D / d) of the diameter (D) of the column to the diameter (d) of the hollow is 1 to 25. The dental composite blank according to claim 1, The method according to claim 1,
Wherein a ratio (D / d) of the diameter (D) of the column to the diameter (d) of the hollow is 5 to 20. The method according to claim 1,
Wherein the dental composite blank is polymerized by molding the blank composition into a hollow columnar shape. The method according to claim 1,
Wherein the blank composition comprises at least 100 parts by weight of at least one selected from the group consisting of unsaturated double bonds-containing monomers and unsaturated double bonds-containing monomer oligomers; 0.001 to 5 parts by weight of a polymerization initiator; And 40 to 900 parts by weight of a filler. The method according to claim 1,
Wherein the polymerization initiator comprises at least one selected from a photopolymerization initiator and a thermal polymerization initiator. The method according to claim 1,
Wherein the unsaturated double bond-containing monomer is a methacrylate (MA) -based monomer. 11. The method of claim 10,
The methacrylate monomer may be selected from the group consisting of 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane (Bis-GMA), ethylene glycol dimethacrylate (EGDMA) , Triethylene glycol dimethacrylate (TEGDMA), ethoxylate bisphenol A dimethacrylate (Bis-EMA), urethane dimethacrylate (UDMA), dipentaerythritol pentaacrylate (dipentaerythritol pentaacrylate monophosphate (PENTA), 2-hydrozyethyl methacrylate (HEMA), polyalkenic acid, biphenyl dimethacrylate (BPDM), and glycerol phosphate dimethacrylate Wherein the composition is at least one selected from glycerol phosphate dimethacrylate (GPDM). 12. The method of claim 11,
The methacrylate monomer may be selected from the group consisting of 2,2-bis- (4- (2-hydroxy-3-methacryloyloxypropoxy) phenyl) propane (Bis-GMA), ethylene glycol dimethacrylate (EGDMA) , Ethoxylate bisphenol A dimethacrylate (Bis-EMA), and urethane dimethacrylate (UDMA). The method according to claim 1,
Wherein the filler comprises at least one selected from inorganic fillers and organic fillers. 14. The method of claim 13,
The inorganic filler may be selected from the group consisting of synthetic amorphous silica, crystalline silica, barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, Barium aluminoborosilicate, strontium silicate, strontium borosilicate, strontium aluminoborosilicate, calcium silicate, aluminosilicate (also referred to as alumino silicate), barium aluminoborosilicate, strontium silicate, strontium borosilicate, strontium aluminoborosilicate, at least one selected from the group consisting of alumino silicate, silicon nitrides, titanium dioxide, calcium hydroxyapatite, zirconia, and bioactive glass. A composite dental blank. 15. The method of claim 14,
Barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, barium aluminoborosilicate, strontium silicate, strontium borate, boron silicate, Strontium borosilicate, and strontium aluminoborosilicate are in the form of particles, and the size of the particles is 0.2 to 3 탆. 15. The method of claim 14,
Wherein said synthetic amorphous silica, crystalline silica and zirconia are in the form of particles and said particles have a size of 5 to 100 nm. The method according to claim 1,
Wherein the dental composite blank is characterized in that the hollow column has a diameter D of 10 to 110 mm and a hollow diameter d of 5.5 to 20 mm. At least one selected from the group consisting of a monomer containing an unsaturated double bond and an oligomer of a monomer containing an unsaturated double bond; filler; And a polymerization initiator; (a) preparing a blank composition comprising:
(B) filling the blank composition into a mold in the form of a hollow column; And
(C) polymerizing the composition filled in the mold and molding it into a composite blank in the form of a hollow column;
Wherein the dental composite blanks are made of a synthetic resin. 19. The method of claim 18,
The method of making the dental composite blank
Further comprising the step of removing bubbles of the blank composition filled in the mold in the form of a hollow column after said step (b). ≪ Desc / Clms Page number 20 >

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