WO2019004506A1 - Artificial crown and manufacturing method therefor - Google Patents

Abstract

The present invention provides an artificial crown and a manufacturing method therefor, and according to the manufacturing method of the present invention, an artificial crown having a crown shape can be prepared by mixing a nanofiller, a thermoplastic resin and silica, and then applying the mixture onto fibers so as to prepare a plate, placing the prepared plate into a mold, applying heat thereto so as to perform molding, and then cooling the same. In addition, the artificial crown of the present invention can be thermally deformed in a short time and can be easily used for the production of a customized denture capable of restoring lost dental functions and an aesthetic appearance, thereby enabling convenience to be provided to patients and also to dentists and dental technicians.

Description

Artificial crown and its manufacturing method

The present invention relates to an artificial crown and its manufacturing method, and more particularly, to an artificial crown having improved physical properties by introducing high-strength functional fibers into a crown made only of a conventional resin, And more particularly, to an artificial crown for facilitating the manufacture of a customized prosthesis and providing convenience to dentists and dental technicians, as well as patients.

Generally, when a tooth is damaged by tooth decay, gum disease, or tooth extraction, it is difficult to break up for ingestion of food, or the shape of the face may be asymmetrically deformed, Rapid treatment and treatment with artificial teeth are essential for a healthy life.

The crown of the tooth refers to the head of the tooth, and the head of the molar is like a crown. It is roughly the upper third of the total teeth. The crown of the front part is essential for esthetical role and accurate pronunciation, while the crown of the molar part functions to chew food, but it is difficult to function properly with only the head of the teeth, and it is possible to have a backed tooth root and healthy periodontal support.

An artificial crown is a dental restoration that wraps around the entire tooth. Use it to strengthen the teeth when the teeth are cracked, broken or weakened, when grooving at the root, or when there is not enough tooth structure to support the filler. Artificial crown made of 100% ceramic is mainly used for anterior teeth (front teeth). Ceramic artificial crown is natural and translucent, so it is suitable for use on cosmetic front teeth. On the other hand, if strength is more important than beauty, tooth-colored dental crown is used, which is a mixture of ceramics and metal. Gold teeth are used in the posterior teeth (molar teeth) or in the back teeth. The gold teeth are strong and resistant, and they are stronger than the ceramic teeth and are not broken.

Conventional artificial crown products are predominantly crown shaped, predominantly made of aluminum crown for posterior teeth (for molar teeth) and zirconia crown for anterior teeth (forearm teeth). In addition, the existing products have a disadvantage in that it is necessary to erase the teeth in order to fit the crown, and it takes a long time to manufacture them to fit them, and it is impossible to wear them immediately. Therefore, the patient has inconvenience and time wasted due to hospital visit again.

Accordingly, the present invention has been completed in order to provide convenience to patients, dentists and dental technicians by developing an artificial crown which is easy to manufacture a customized prosthesis by introducing high-strength functional fibers and short-time thermal deformation.

Accordingly, one object of the present invention is to provide an artificial crown having improved physical properties by introducing high-strength functional fibers into a crown made only of a conventional resin.

Another object of the present invention is to provide an artificial crown manufactured by mixing a nanofiller, a thermoplastic resin and silica on a fiber, compressing and alighting the fiber, cooling through a molding process, and a method of manufacturing the artificial crown .

In one aspect, the present invention provides a method of manufacturing a semiconductor device, comprising: (1) mixing a material; (2) applying the mixed material on the fiber in the step (1); (3) pressing the fibers applied in the step (2) and cutting the fibers into a plate; (4) molding the plate, which has been removed in the step (3); (5) cooling the plate formed in the step (4).

The manufacturing method according to the present invention is shown in FIG. 1, and a method of manufacturing an artificial crown according to the present invention will now be described in detail with reference to FIG. 1.

In the step (1), a nanofiller, a thermoplastic resin and silica are used as a material, and a nanofiller and a thermoplastic resin are mixed and then silica is mixed. Typically, the matrix containing the thermoplastic resin is mostly filled with a ceramic cluster filler containing zirconia (Zirconia) and alumina (Alumina). In this case, filling the interstitial spaces of the matrix with the nanopiller can improve the resistance to abrasion and fracture of the resin. Therefore, the nanofiller and the thermoplastic resin are mixed at a ratio of 90 wt%: 10 wt%. Preferably, the nanofiller and the thermoplastic resin are mixed at a ratio of 80 wt%: 20 wt%, more preferably at a ratio of 70 wt%: 30 wt%.

The thermoplastic resin may be at least one selected from the group consisting of polyglycolic acid (PGA), poly-ε-caprolactone, polydioxanone, polylactic acid-glycolic acid copolymer (PLGA), polydioxane-caprolactone copolymer polyhydroxybutyric acid-co-hydroxy resin, polydioxanone-co-ε-caprolactone, polylactic acid-caprolactone copolymer, polyhydroxybutyric acid-co-hydroxyvleric acid copolymer, Polyoxyethylene-polylactic acid copolymer, polyethylene oxide-polylactic acid copolymer, polyethylene oxide-polylactic glycolic acid copolymer, and polyethylene oxide-polycaprolactone copolymer are used in combination.

Yellow and red pigments may be mixed with the thermoplastic resin to control the color tone of the permanent-tooth pipe. The pigments may be used at 0.0001 phr (parts per hundred rubber) to 0.1 phr. Preferably 0.001 to 0.1 phr, more preferably 0.02 to 0.08 phr.

The silica (SiO ₂ ) is the most abundant component in the crust and is a chemical compound of silicon and oxygen. Silica is a typical glass-forming mineral, and when the liquid is quenched, it readily changes to a glassy state and becomes quartz glass. Quartz glass is highly heat-resistant, has a very low coefficient of thermal expansion, is strong against thermal shock, and has excellent chemical resistance. The hardness of the artificial crown of the present invention can be controlled by controlling the mixing ratio of silica having such characteristics.

In the step (2), the fibers may be one or two or more selected from the group consisting of glass fiber, carbon fiber, and aramid fiber.

Carbon fiber is a fiber made by heating and carbonizing organic fibers in an inert gas and has properties such as high strength, high tensile strength, light weight, conductivity, corrosion resistance, chemical resistance, fatigue resistance and biocompatibility. Core materials, medical CT equipment, robot parts, aviation, wind power equipment, and automobile parts.

Fiberglass is a fiber made by finely milling inorganic fiber obtained by melt-spinning a qualitative glass raw material at a high temperature of 1,600 ℃ ~ 1,800 ℃ for several hundreds of minutes depending on the application. It has properties such as heat resistance, heat insulation, chemical resistance and thermal stability (FRP) industrial raw materials, leisure products, general industrial products, etc., in combination with organic materials.

Aramid fiber is a polymer polyamide formed by bonding an amide bond and an aromatic ring such as a benzene ring. The aramid fiber is excellent in tensile strength, toughness and heat resistance, and has high strength and high elastic modulus. In addition, it is used as plastic reinforcement material because it does not increase even if you apply any force. It is applied to military materials such as bulletproof jacket and helmet, golf club, tennis racket, etc. by taking advantage of these advantages.

The application is performed so that the mixed material is coated on the fiber so that the total thickness is 0.1 m to 0.5 m, preferably 0.2 m to 0.4 m, and more preferably 0.25 m to 0.35 m.

In the step (3), the plate may be pressed with the mixed material-applied fiber under pressure, and the plate may be cut to a size suitable for its use, for example, a width X length of 300 mm x 300 mm.

In the present invention, the artificial crown can be standardized in various sizes.

The above standard refers to tooth size, crown length, crown diameter of crown, crown diameter of cervical crown, crown of crown and crown diameter, size and size of each crown.

As a specific example of the above standard, each permanent tooth constituting the maxilla and mandible is divided into a tooth shape, a tooth crown length, a root crown of a crown, a root crown of a cervical crown, a crown of a crown, Respectively. The results are shown in Tables 1 to 3 below. More specifically, the following Table 1 is a "large" standard, Table 2 is a "medium" standard, and Table 3 is a "small" standard. The tooth size, the length of the crown, the diameter of the crown of the crown, the diameter of the crown of the cervical crown, the diameter of the crown, and the diameter of the crown were set to a single size. The following Tables 1 to 3 are the permanent tooth size standards, and Table 4 is an example of the tooth size basic standard or the present invention.

Permanent tooth (unit = mm)		Length of crown	Root of crown	Root of cervical spine	Crown of the crown,
Maxilla	Central incisor	11.5	9.5	8.0	8.0
	Lateral incisal	10.0	7.5	6.0	7.0
	Canine	11.0	8.5	6.5	9.0
	First premolar	9.5	8.0	6.0	10.0
	Second premolar	9.5	8.0	6.0	10.0
	First molar	8.5	11.0	9.0	12.0
	Second molar	8.0	10.0	8.0	12.0
Mandatory	Central incisor	10.0	6.0	4.5	7.0
	Lateral incisal	10.5	6.5	5.0	7.5
	Canine	12.0	8.0	6.5	8.5
	First premolar	9.5	8.0	6.0	8.5
	Second premolar	9.0	8.0	6.0	9.0
	First molar	8.5	12.0	10.0	11.5
	Second molar	8.0	11.5	9.0	11.0

Permanent tooth (unit = mm)		Length of crown	Root of crown	Root of cervical spine	Crown of the crown,
Maxilla	Central incisor	10.5	8.5	7.0	7.0
	Lateral incisal	9.0	6.5	5.0	6.0
	Canine	10.0	7.5	5.5	8.0
	First premolar	8.5	7.0	5.0	9.0
	Second premolar	8.5	7.0	5.0	9.0
	First molar	7.5	10.0	8.0	11.0
	Second molar	7.0	9.0	7.0	11.0
Mandatory	Central incisor	9.0	5.0	3.5	6.0
	Lateral incisal	9.5	5.5	4.0	6.5
	Canine	11.0	7.0	5.5	7.5
	First premolar	8.5	7.0	5.0	7.5
	Second premolar	8.0	7.0	5.0	8.0
	First molar	7.5	11.0	9.0	10.5
	Second molar	7.0	10.5	8.0	10.0

Permanent tooth (unit = mm)		Length of crown	Root of crown	Root of cervical spine	Crown of the crown,
Maxilla	Central incisor	9.5	7.5	6.0	6.0
	Lateral incisal	8.0	5.5	4.0	5.0
	Canine	9.0	6.5	4.5	7.0
	First premolar	7.5	6.0	4.0	8.0
	Second premolar	7.5	6.0	4.0	8.0
	First molar	6.5	9.0	7.0	10.0
	Second molar	6.0	8.0	6.0	10.0
Mandatory	Central incisor	8.0	4.0	2.5	5.0
	Lateral incisal	8.5	4.5	3.0	5.5
	Canine	10.0	6.0	4.5	6.5
	First premolar	7.5	6.0	4.0	6.5
	Second premolar	7.0	6.0	4.0	7.0
	First molar	6.5	10.0	8.0	9.5
	Second molar	6.0	9.5	7.0	9.0

Tooth tooth (unit = mm)		Length of crown	Root of crown	Root of cervical spine	Crown of the crown,
Maxilla	Central incisor	6.0	6.5	4.5	5.0
	Lateral incisal	5.6	5.1	3.7	4.8
	Canine	6.5	7.0	5.1	7.0
	First Goal	5.1	7.3	5.2	8.5
	Second posterior	5.7	8.2	6.4	10.0
Mandatory	Central incisor	5.0	4.2	3.0	4.0
	Lateral incisal	5.2	4.1	3.0	4.0
	Canine	6.5	5.0	3.7	4.8
	First Goal	6.0	7.7	6.5	7.0
	Second posterior	5.5	9.9	7.2	8.7

As described above, the permanent teeth can be manufactured to the standardized artificial crown according to the present invention in the standards shown in Tables 1 to 3 above, and the artificial crown according to the present invention can be manufactured according to the standard shown in Table 4 .

The molding in the step (4) is to form the crown for the purpose of the present invention so as to have various sizes and shapes of the above-mentioned standardized sizes. The molding can be carried out by a conventional method, and one specific example can be formed by a compression molding method. Compression molding is a method of putting a plastic material into a mold, heating it, and applying pressure to the desired shape. As a specific example of the present invention, the plate put in step (3) is placed in a die mold having the above standard, heated with heat at 100 to 200 DEG C, and then mixed with a material layer in which the fiber portion of the plate is mixed by applying pressure To form a shell. Preferably 120 to 180 캜, and more preferably 140 to 160 캜. On the other hand, a softening and holding process may be added in the molding step. The softening is a process for increasing the workability of a plate formed in a shell shape, and the formed shell-shaped plate is heated to 100 to 150 ° C to increase the workability. Preferably 110 to 140 占 폚, and more preferably 115 to 130 占 폚. The pressure is applied to compensate for the shrinkage of the plate in the mold when the molded plate is cooled, so that the shape of the product can be maintained as desired and the defective portion of the molded product can be prevented through the pressure holding process.

In the step (5), the crown-shaped crown can be manufactured by cooling it by a conventional method for 30 to 40 seconds.

The artificial crown manufactured according to the present invention can be used as an injection tube (for a child) or a permanent tooth tube (for an adult). The tooth is called a child's tooth, and the tooth is replaced with a permanent tooth. The artificial crown for an artificial tooth has a characteristic of being deformed within 100 ° C. It can be put into boiling water for 20 to 50 seconds, and if it has a slight ductility, it can be directly used by pressing it into the oral cavity. It is preferably used in boiling water for 25 to 40 seconds, more preferably 30 to 35 seconds. On the other hand, the permanent teeth have a large shape, rich in minerals, high in hardness, and small in size (齒 髓 cavity) compared with the teeth, because they function during their lifetime. The artificial crown for permanent tooth can be deformed at over 100 ℃ and it can be used by pressing directly on the gypsum model with the deteriorator.

In addition, the artificial crown of the present invention may be a single crown, but it may be a connecting crown for artificial tangles in which two or more are connected together. The connecting crown can be manufactured by the same method as that of the remaining artificial crown except that the blending ratio of the nanofiller and the thermoplastic resin is blended with nanofiller (~ 80 wt%) and thermoplastic resin (~ 20 wt%).

In one specific use method of the present invention, the primer is applied inside the manufactured artificial crown, and light curing is performed for 5 to 30 seconds. Preferably, light curing is performed for 7 to 15 seconds, and more preferably light curing is performed for 9 to 12 seconds. Next, the composite resin is filled in the artificial crown, and light curing is performed again for 10 to 30 seconds. Preferably 15 to 25 seconds, and more preferably 17 to 22 seconds. It is then placed on the tooth to be treated and finally used for polishing.

On the other hand, composite resin is a mixed material composed of organic polymer and inorganic filler. Due to the development of polymer engineering, composite resins are widely used in various fields ranging from automobiles, aircrafts, household appliances, and medical equipments that require high strength in daily life, and they are attracting attention as dental restorative materials. Dental restorative materials have traditionally been used with materials such as gold, alloys, or amalgam because high strength is required to restore the chewing function. These metallic materials have the disadvantage of being non-esthetic because they do not have the color of teeth. Also, since the metallic material is not bonded to the teeth, many deletions of the teeth must be preceded in order to prevent the restoration from falling off. In contrast, the adhesive restoration including the composite resin has the advantage of minimizing tooth deletion and enhancing the structure of the vulnerable tooth by the defect, so that the tooth can be preserved without unnecessary tooth erasure.

The artificial crown manufactured according to the above manufacturing method can be used to easily manufacture a customized prosthesis that enables the restoration of the lost tooth function and the aesthetic shape.

According to the present invention, it is possible to provide a method of manufacturing an artificial crown having improved physical properties by introducing high-strength functional fibers into a crown made only of a conventional resin.

Therefore, the artificial crown of the present invention can be easily used for manufacturing a customized prosthesis for restoration of a lost tooth function and an aesthetic shape, thereby providing convenience to dentists and dental technicians, as well as patients.

1 is a flow chart of a manufacturing process of an artificial crown of the present invention.

Fig. 2 shows a sample preparation process for evaluating the properties of an artificial crown of the present invention.

FIG. 3 shows a sample preparation process for evaluating the water absorption and solubility of the artificial crown of the present invention.

Hereinafter, a method for manufacturing an artificial crown according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples and the like according to the gist of the present invention. will be.

Example 1: Manufacturing method of artificial crown

In order to develop the artificial crown of the present invention, an inorganic composite resin is prepared by mixing nanofiller (~ 70 wt%), thermoplastic resin (~ 30 wt%) and silica so as to have a total thickness of 0.3 m on the high- Respectively. In addition, yellow and red pigments were mixed with a thermoplastic resin to show the color tone of the artificial crown. Then, the high-strength functional fiber coated with the inorganic composite resin was pressed to produce a plate having a size of 300 mm x 300 mm. The prepared plate was placed in a metal mold, heated at about 150 ° C. for 15 seconds, and then shaped into a shell. Then, it was softened by heating to about 120 DEG C, and a pressure holding process was performed. After cooling for 30 to 40 seconds, a crown-shaped crown was prepared.

The connecting crown was prepared in the same manner as the other artificial crown manufacturing methods except that the blending ratio of the nanofiller and the thermoplastic resin was blended with nanofiller (~ 80 wt%) and thermoplastic resin (~ 20 wt%).

In addition, the artificial crown can be manufactured as an inlet tube (for a child) or a permanent tooth tube (for an adult). The inlet pipe has a characteristic of being deformed within 100 ℃ and it is put into boiling water for more than 30 seconds and if it has a slight ductility, it is directly pressed to the oral cavity and molded. The permanent-tooth tube is a crown with increased hardness by varying the content of silica and has a characteristic of being deformed at a temperature of 100 ° C or higher. It is lightly heated by a deteriorator and directly press-molded into a plaster model.

The prepared artificial crown was coated with a primer in a crown-shaped artificial crown, subjected to light curing for about 10 seconds, filled with a composite resin, and then subjected to light curing for about 20 seconds It is covered on the teeth to be treated and finally used by polishing.

Example 2: Evaluation of physico-chemical and biological safety of manufactured artificial crown

The specimens of the artificial crown prepared in the above Example 1 were classified into bubbles and defects according to the Guideline of the Food and Drug Administration's Safety Directive and Related Standard and Food Safety Management Notice No. 2014-115, : ISO 22112), surface finish (related standards: ISO 22112, ISO 10477), color consistency (ISO 7491), color stability, water absorption, water solubility and biosafety.

The specimens for the color stability test were 37 ± 1 for 23 ± 1 hours. The specimens for the color stability test were as follows: bubble and defect (related standard: ISO 22112), surface finish (ISO 22112, ISO 10477) Lt; RTI ID = 0.0 > C < / RTI > for 60 +/- 10 hours. The sample preparation process is shown in Fig.

On the other hand, the water absorption and water solubility test specimens were immersed in water at 37 ± 1 ° C for 7 days ± 2 hours and then wetted specimens were weighed and the wet specimens were heated at 37 ± 1 ° C Dried in an oven at 23 ± 1 ° C for 60 ± 10 hours and then used. The sample preparation process is shown in Fig.

Cytotoxicity test, oral mucosal irritation test and sensitization test were carried out using the sample solution to evaluate the biological safety of the sample.

As a result of the test, the artificial crown manufactured according to the manufacturing method of the present invention meets the Common Criteria for Biological Safety of Medical Devices, Guideline of the Food and Drug Administration, and Related Standard and Food Safety Management Notice No. 2014-115, It is confirmed that it can be useful for the dental equipments industry for making prosthetic prosthesis.

TECHNICAL FIELD The present invention relates to an artificial crown capable of improving physical properties in the production of an artificial crown and capable of easily fabricating a customized prosthesis, and a method of manufacturing the same.

Claims (6)

1. (1) mixing nanofiller, thermoplastic resin and silica;

   (2) applying the mixed material on the fiber in the step (1);

   (3) pressing the fibers applied in the step (2) and cutting the fibers into a plate;

   (4) molding the plate, which has been removed in the step (3);

   (5) cooling the plate formed in the step (4).
2. The thermoplastic resin composition according to claim 1, wherein the thermoplastic resin is selected from the group consisting of polyglycolic acid (PGA), poly-ε-caprolactone, polydioxanone, polylactic acid-glycolic acid copolymer (PLGA) Caprolactone copolymer, polyhydroxybutyric acid-co-caprolactone copolymer, polyhydroxybutyric acid-co-caprolactone copolymer, polyhydroxybutyric acid- at least one member selected from the group consisting of polyvinyl alcohol, polyvinyl alcohol, hydroxyvleric acid, polyphosphoester, polyethylene oxide-polylactic acid copolymer, polyethylene oxide-polylactic glycolic acid copolymer and polyethylene oxide-polycaprolactone copolymer Are mixed with each other and used.
3. The artificial crown according to claim 1, wherein the fibers are one or more selected from the group consisting of glass fibers, carbon fibers, and aramid fibers. ≪ / RTI >
4. The method according to claim 1, wherein the step (4) is performed by applying heat at 100 to 200 ° C.
5. The method according to claim 1, wherein the forming step (4) further includes softening and / or pressing.
6. An artificial crown manufactured by the manufacturing method according to any one of claims 1 to 5.

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