JP2005224601A - Composition of mold release agent for dentistry - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composition of a mold release agent for dentistry which hardly causes anxiety such as allergy or the like, is excellent in application properties, is easy to be handled, and can easily release a resin base prosthesis even from a plaster model or the like having a complicated shape. <P>SOLUTION: The composition of the mold release agent for dentistry is made by dissolving a polyolefin copolymer including at least a structural unit derived from an ethylene and a structural unit derived from a 3-20C α-olefin in an organic solvent. It is desirable that this polyolefin copolymer further includes a structural unit derived from a non-conjugated diene. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a release material composition used for dental treatment. In particular, a resin-based prosthesis such as a resin inlay produced from a complex inner / outer cavity-type gypsum model such as a resin jacket crown or MOD cavity produced from an outer-cavity-type gypsum model from a gypsum model The present invention relates to a dental release material composition that can be easily released. The present invention also relates to a dental release material composition used for releasing dental materials composed of dental resin materials, dental metal materials, and dental inorganic materials.

  When preparing a resin-based prosthesis by the indirect method, build up a resin-based paste containing a polymerizable monomer, filler, and photopolymerization initiator as the main components on a gypsum model prepared based on the oral impression. Then, a method of producing a prosthesis by photocuring is common.

  However, the paste is directly built on the plaster model, and then the resin component is released from the plaster model because the paste component penetrates into the plaster and hardens in the plaster even if it is photocured and released from the plaster model. It is not easy.

  Therefore, after applying the dental release material to the plaster model first, the paste is built up, and then photocured to release the prosthesis from the plaster so that the resin-based prosthesis can be released. A method is used in which a dental release material is removed by sandblasting, washing, or the like, and then the abutment tooth in the oral cavity and the prepared resin-based prosthesis are bonded with an adhesive resin cement or the like.

  Also, the coating thickness of the dental release material corresponds to the thickness of the adhesive cement, but if the cement layer is thick, the color tone of the cement may affect the color tone of the resin-based prosthesis and affect aesthetics. It is clinically preferable that the thickness of the dental release material thin film is 10 to 50 μm.

  When building a paste in a concave inner gypsum cavity with few edges, etc., and then photocuring to produce a resin-based prosthesis, the plaster model cavity and resin-based prosthesis due to polymerization shrinkage that occurs during photocuring Therefore, the resin-based prosthesis can be released as long as it is a dental release material capable of preventing the paste component from impregnating the gypsum. Such a mold release material is a dental mold release material in which an alginate-based solution is applied to a gypsum model and dried, and a hard film formed by a crosslinking reaction between the calcium content of gypsum and alginic acid is used as a mold release layer, or a surface active material. Dental release materials that apply liquid thin films with poor affinity to resin components, such as agent solutions and silicone oils, to plaster models are widely used.

  However, in the convex outer gypsum cavity model like a resin jacket crown, the paste is built up on the convex part. In hard thin-film dental release materials such as system release materials, or liquid dental release materials with high fluidity such as surfactant types and silicone oil types (and thus can be eliminated from the gaps under contraction pressure) It is difficult to release the resin-based prosthesis from the plaster model. Furthermore, in a complicated form of an inside / outside cavity type gypsum model such as a MOD cavity, since the model has edges and anchor portions, these dental mold release materials cannot release the prosthesis from the gypsum model.

  Therefore, dental release materials for forming natural rubber latex as a release layer are commercially available in order to deal with complicated outer and outer cavities type gypsum models such as convex outer mortar models and MOD cavities.

  Since this dental release material is a polyisoprene rubber composed only of hydrocarbons having no polar group, the affinity for resin prosthesis containing polar groups such as ester groups and carbamoyl groups is poor. Furthermore, since the coating is flexible, the resin-based prosthesis can be easily released from a plaster model having a complicated shape. However, using a dental release material made of natural latex can secure a sufficient cement thickness in the crown part, but using a dental release material made of natural latex in the margin makes the cement thickness too thick, so it can be worn in the oral cavity. Sometimes it is not only aesthetically inferior, but there is also a risk that notch is generated in the cement layer due to wear in the oral cavity, leading to breakage of the resin-based prosthesis. In order to prevent such a resin-based prosthesis from breaking, a method is employed in which natural latex is used for the crown portion and the above-mentioned alginate-based release material is used for the margin portion so that the coating thickness is thin. However, in addition to the complexity of using two types of release materials, in recent years, allergies using proteins contained in natural rubber as an antigen have been regarded as a problem, and there are concerns about safety.

  Silicone rubber-based dental release materials are also commercially available. Unlike the silicone oil type dental release material, this dental release material is mixed immediately before use with a solution (1) containing polyalkylalkenylsiloxane and platinum catalyst and a solution (2) containing polyalkylhydrogensiloxane. Then, it is a mold release material that is applied to a gypsum model in a solution state and left to stand for several minutes for addition polymerization to form a polymer silicone rubber coating. This dental release material has a release performance similar to that of natural latex and also has biosafety not found in natural latex, but entrains bubbles when mixing (1) and (2), There is a problem that voids or the like are easily generated in the cured coating. Also, because the curing time varies depending on the working temperature, even if a mixed solution is prepared, it cannot be used after being cured on a gypsum model, or when it is left on the gypsum model for a specified time after application, the silicone rubber coating does not cure. There is also a problem in handling such as not being formed.

  An example of mold release for dental use other than the above is an example of mold release between gypsum and porcelain. When porcelain is built, porcelain mud composed of inorganic powder and water is built up on a metal frame. However, when the porcelain mud comes into contact with the adjacent gypsum, the water contained in the porcelain mud is absorbed by the gypsum. Built structures may break. In order to prevent such breakage of the built-up structure, the method of forming the above-mentioned alginic acid film on the adjacent plaster model is adopted, but since this alginic acid film also has a characteristic of absorbing water, the plaster model is still used. Since the water is absorbed in the water and the breakage cannot be completely prevented, there is room for improvement.

  An example of mold release between a dental metal and a dental resin is shown below. When producing a resin for a metal floor by bonding an immediately polymerizable resin or the like to the metal floor, the metal floor and the finishing line of the resin are separated. If the mold material is not applied, the resin adheres to unnecessary metal parts, so it is difficult to remove the resin easily, and improvement is required.

  Furthermore, when an example of mold release between a dental resin and a dental resin is shown, when the resin core and the temporary crown are released, the above-described fracture of the plaster model and the resin-based prosthesis is also described. Since the folding phenomenon is recognized, improvement is desired.

  As described above, mold release between dental materials and dental materials is performed in various applications, but existing mold release materials have advantages and disadvantages, and dental mold release materials that can be used for many purposes are desired.

The present invention is less susceptible to allergies, does not require separate coating, is easy to handle, such as excellent applicability, and easily releases a resin-based prosthesis from a plaster model having a complicated shape. It is an object of the present invention to provide a dental release material composition that can be used.

  Furthermore, the present invention is a mold release applicable to all dentistry, such as mold release between dental metal and dental resin, mold release between dental resin and dental resin, mold mold and porcelain mold release, etc. Another object of the present invention is to provide a dental release material composition that is also preferably used for operation.

  As a result of intensive studies to solve these problems, the present inventors have completed the present invention. That is, the dental release material composition of the present invention is obtained by dissolving a polyolefin polymer containing at least a structural unit derived from ethylene and a structural unit derived from an α-olefin having 3 to 20 carbon atoms in an organic solvent. It is a feature.

  The dental release material composition of the present invention is not only for exfoliating a resin prosthesis from a gypsum model, but also at least one selected from the group consisting of dental resin materials, dental metal materials, and dental inorganic materials. It can be used for mold release between dental materials composed of different kinds of materials.

  The dental release material composition of the present invention comprises a solution in which a polyolefin-based copolymer is dissolved, has less fear of allergies, has high safety, and is excellent in flexibility. Moreover, since it is a one-component type, a release film can be formed by a simple operation of applying and drying a plaster model or the like with a brush at room temperature, and handling is very easy. Then, by controlling the number of coating / drying times and / or the concentration of the polyolefin copolymer, the coating thickness can be adjusted in accordance with the thickness of the cement layer required for the crown portion or the margin portion. it can. In addition, since the polyolefin copolymer used in the present invention is composed of hydrocarbons and is nonpolar, it is used not only for resin prosthesis containing polar groups such as ester groups or carbamoyl groups, but also for general dental resins. The resin-based prosthesis can be easily released from a plaster model or the like having a complicated shape due to its poor affinity with the adhesive material having adhesive properties and the flexible coating.

The dental release material composition of the present invention will be described in detail below.
The dental release material composition of the present invention is formed by dissolving a polyolefin copolymer having at least a structural unit derived from ethylene and a structural unit derived from an α-olefin having 3 to 20 carbon atoms in an organic solvent. .

  The polyolefin copolymer used in the present invention is a polymer having at least a structural unit derived from ethylene and a structural unit derived from an α-olefin having 3 to 20 carbon atoms, preferably a binary copolymer or a ternary. It is a copolymer. 1 type of C3-C20 alpha olefin copolymerized with ethylene may be used, and may be used in combination of 2 or more type.

Specifically, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, 4-
Methyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, 3-ethyl-1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1- Examples include hexadecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene and the like. Among these, α-olefins having 3 to 10 carbon atoms such as propylene, 1-butene, 1-hexene and 1-octene are preferable, and α-olefins such as propylene, 1-butene and 1-octene are particularly preferable.

  The polyolefin copolymer may further be a copolymer having a structural unit derived from a non-conjugated diene, preferably a ternary copolymer. The non-conjugated diene co-labeled here has one carbon / carbon double bond among the carbon / carbon double bonds existing in the non-conjugated diene molecule as a vinyl group at the end of the molecule. The carbon double bond is preferably present in the form of an internal olefin structure in the molecular chain including the main chain and the side chain. Examples of such non-conjugated diene compounds include aliphatic dienes and alicyclic dienes, and these may be used alone or in combination of two or more.

Specific examples of non-conjugated dienes include 5-ethylidene-2-norbornene, 5-propylidene-2-norbornene, dicyclopentadiene, 5-vinyl-2-norbornene, 5-methyl-2-norbornene, and 5-isopropylidene. Cyclic non-conjugated dienes such as -2-norbornene and norbornadiene; 1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,5-heptadiene, 6-methyl-1,5-heptadiene, 6 -Chain-like nonconjugated dienes such as methyl-1,7-octadiene and 7-methyl-1,6-octadiene; and trienes such as 2,3-diisopropylidene-5-norbornene. Among these, 5-ethylidene-2
-Norbornene, 1,4-hexadiene and dicyclopentadiene are preferred, and 5-ethylidene-2-norbornene and dicyclopentadiene are particularly preferred.

Next, the composition ratio of each structural unit constituting the polyolefin copolymer, particularly the binary copolymer and the ternary copolymer in the present invention will be described.
First, in a binary copolymer having a structural unit derived from ethylene and a structural unit derived from an α-olefin having 3 to 20 carbon atoms, the coating film formed from the dental release material composition of the present invention has a desired release. The composition ratio of each structural unit is not particularly limited as long as it shows moldability. In general, although polyethylene has a low glass transition point and is easy to crystallize and has a high melting point, it is a rigid body at room temperature, but the molecular arrangement of polyethylene can be obtained by copolymerizing an α-olefin having 3 to 20 carbon atoms. It becomes a flexible polymer by disturbing and inhibiting crystallization. Accordingly, the amount of structural units derived from ethylene affects the properties of the polymer and is generally 2 to 90% by weight, preferably 10 to 90% by weight, more preferably 20 to 90% by weight. Use of the original copolymer is one of preferable conditions for obtaining a flexible film having good releasability.

  A terpolymer composed of a structural unit derived from ethylene, a structural unit derived from an α-olefin having 3 to 20 carbon atoms, and a structural unit derived from a non-conjugated diene also includes an α-olefin having 3 to 20 carbon atoms and By copolymerizing a non-conjugated diene, the crystallization of polyethylene is inhibited to become a flexible substance, so that the structural unit derived from ethylene is 1 to 90% by weight, preferably 10 to 80% by weight, more preferably 20 A terpolymer composed of 1 to 20% by weight, preferably 2 to 15% by weight, more preferably 2 to 10% by weight of structural units derived from non-conjugated dienes is preferably used. It is done. Further, since this terpolymer does not dissolve in an organic solvent when vulcanized with sulfur or the like and crosslinked, it is preferably used in an unvulcanized state. In addition, it may be vulcanized if it is a small amount that does not hinder the effects of the present invention.

The MFR (g / 10 minutes, 190 ° C.) in the case of a polyolefin copolymer used in the present invention, particularly a binary copolymer, is usually 0.5-100 g / 10 minutes, preferably 0.5-80 g. / 10 minutes, more preferably 0.5 to 50 g / 10 minutes, and the density (kg / m ³ , 23 ° C.) is usually 500 to 1000 kg / m ³ , preferably 600 to 1000 kg / m ³ , more preferably Is preferably in the range of 600 to 1000 kg / m ³ . Since the release agent solution of the present invention containing such a polyolefin copolymer has an appropriate viscosity, it can be applied to a plaster model and can form a release film having excellent release properties.

In the case of a polyolefin polymer, particularly a terpolymer, Mooney viscosity (ML
(1 + 4) 100 ° C. is usually in the range of 1 to 50, preferably 3 to 50, more preferably 5 to 40, and a dental release material composition excellent in viscosity and release performance of the release material solution. Can be provided.

Polymerization other than the above is within a range that does not impair the performance such as handleability and releasability of the dental release material composition of the present invention, for example, preferably 20% by weight or less, more preferably 10% by weight or less. It may be included as a structural unit derived from a sex compound. Although there is no restriction | limiting in such a polymeric compound, Specifically, styrene, alpha-mesitylene, vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile, 1, 4- butadiene, isoprene, fluorine-containing olefin,
Mention may be made of maleic anhydride, silyl group-containing ethylene and the like.

The polyolefin copolymer that forms the release material composition of the present invention preferably has predetermined mechanical properties. That is, a test piece having a length of 3 mm, a width of 30 mm, and a height of 10 mm formed by using the polyolefin copolymer constituting the release material composition of the present invention is converted into, for example, a small tabletop testing machine (EZ · Test, tooth profile manufactured by Shimadzu Corporation). Using a push bar B and a JIS fold test jig), perform a three-point bend test at room temperature, typically 18-30 ° C, span 20mm, crosshead speed 2mm / min. The flexural modulus obtained by the least square method is usually 5 N / mm ² or less, preferably 2 N / mm ² or less, more preferably 1 N / mm ² for the flexural modulus between the test forces of 0.1 N and 0.2 N. When it is below, a release film excellent in releasability can be obtained.

As the polyolefin copolymer used in the present invention, it is preferable to use a polyolefin copolymer having the mechanical properties as described above, but the test force is 0.1 N / mm ^2.
Therefore, in the case of a copolymer whose flexural modulus is not required under the above conditions, a test piece is cut with a thickness of 1 mm and a depth of 1 mm, and the cut is blocked within 10 seconds. The polyolefin copolymers shown can also be used.

  When preparing the test piece by dissolving the copolymer in an organic solvent and adjusting it, if the copolymer is a mass containing no organic solvent, the length is 3 mm, the width is 30 mm, and the height is 10 mm. What is necessary is just to cut and produce with a cutter knife etc., and if the said copolymer is granular shape, such as a pellet form, the temperature below a decomposition temperature from a melting temperature, the temperature of 180 to 200 degreeC in normal cases Under the conditions, after heating to 1 atm for 1 hour to form a lump, it may be cut into a predetermined test piece shape. If the copolymer is in the form of a solution, the solvent is removed until the solvent content is 0.5% by weight or less, the copolymer is collected, and a three-point bending test is performed using a predetermined test piece. That's fine.

Next, an organic solvent for dissolving the copolymer will be described.
As the kind of the organic solvent for forming the dental release material of the present invention, any organic solvent can be used as long as the coating property of the desired dental release material composition can be improved. An organic solvent capable of dissolving at least wt% is preferred. Also, if the boiling point of the organic solvent is too low, the solvent will volatilize while applying the solution of the dental release material composition to the plaster model etc. with a brush etc. It may not be possible to form a film of the release material. On the other hand, if the boiling point is too high, it is difficult to volatilize even if it is applied to a plaster model or the like, so that it takes time to form a coating film of the release material and it is necessary to heat at a high temperature. Therefore, as the organic solvent, an organic solvent having a boiling point under 1 atm of generally 50 to 200 ° C., preferably 60 to 150 ° C. is used. Preferable organic solvents include hydrocarbon organic solvents such as hexane, heptane, octane, nonane, decane, benzene, toluene, xylene, and benzine, and hexane, heptane, and toluene are particularly preferable. Further, two or more of these organic solvents may be used in combination, and even if the organic solvent cannot be dissolved by 1% by weight or more, this performance can be achieved by using it together with the organic solvent capable of dissolving the copolymer. You may mix and use if it can demonstrate. In addition, although the dental release material composition of the present invention may be applied to the oral cavity, an organic solvent having high biosafety is selected in consideration of use by the surgeon such as a dentist in the oral cavity. It is preferable.

  The concentration of the copolymer in the dental release material composition may be appropriately determined in consideration of applicability to a gypsum model and the volatilization rate of the organic solvent, but generally 1 to 30% by weight, preferably It is 3 to 20% by weight, more preferably 5 to 15% by weight. The dental release material composition of the present invention is a one-component type, and after having been applied to a plaster model once or several times with a brush or the like, it can be easily released just by leaving it at room temperature for several tens of seconds to several minutes. A good coating can be formed, and the thickness of the crown portion and the margin portion of the adhesive resin cement for bonding the abutment tooth corresponding to the coating thickness of the release material and the resin-based prosthesis, preferably 10 ˜50 μm can be secured. Here, if the concentration of the copolymer is less than 1% by weight, the thin film formed from the release material is too thin and the performance for releasing the resin-based prosthesis from the gypsum model is not sufficiently exhibited. Therefore, it is necessary to increase the number of times of application, and the operability becomes complicated. Conversely, if it exceeds 30% by weight, the viscosity of the dental release material composition solution becomes too high, making it difficult to apply to the plaster model with a brush and the like, and not only the applicability is inferior, but also the thickness of the crown part and the margin part. Becomes too thick, which tends to be a cause of inferior aesthetics of the margin portion, and also causes a poor mechanical strength of the resin-based prosthesis.

  In addition, as described above, the dental release material composition of the present invention and the coating film formed from the dental release material composition are poor in affinity with general dental resins containing a (meth) acrylate polymer as a main component. The present invention can be applied as a release material between a resin and a dental resin or as a release product between a dental metal and a dental resin. Furthermore, since the coating film formed from the mold release material composition of the present invention has high hydrophobicity, it is also suitable for mold release between a plaster model and porcelain.

Thus, the dental mold release agent composition of the present invention can be used for mold release operations generally used in the dental field.
For example, the mold release between gypsum and porcelain will be described as an example. For the construction of porcelain, after preparing porcelain mud composed of inorganic powder and water in a frame of metal etc., this porcelain mud is used as a plaster model. There is an operation to build up and release from the plaster model. When porcelain mud comes into contact with the adjacent gypsum, moisture contained in the porcelain mud is absorbed by the gypsum, so that the built-up structure may be broken when the built-up structure is released. Even in such a case, it is possible to form a highly hydrophobic film by using the release material composition of the present invention, and build up on this by interposing such a highly hydrophobic film. Since the water in the porcelain mud is not absorbed by the gypsum and maintains the same moisture content as the built-up, it will not break. In addition, even if the film remains on the built-up object, it can be removed by the firing process, so that it does not affect the adhesion during intraoral mounting.

  An example of mold release between a dental metal and a dental resin is shown below. When producing a resin for a metal floor by bonding an immediately polymerizable resin or the like to the metal floor, the metal floor and the finishing line of the resin are separated. If the mold material is not applied, the resin adheres to unnecessary metal parts, and such a resin cannot be easily removed. That is, since such a resin can only be scraped off with a bar or the like, the removal operation becomes very complicated. However, if the coating of the present invention is formed on the finishing line, the adhesion between the metal and the resin can be prevented, and therefore the resin can be easily removed.

  Moreover, when an example of mold release between a resin and a resin is shown, a temporary crown is formed on the resin core with an immediately polymerizable resin, but a film is formed on the resin core using the release material composition of the present invention. If a temporary crown is produced, it can be easily removed, which is very convenient.

In addition, when the release material composition of the present invention is applied to a dental resin that is heated and polymerized at 100 ° C. or higher, such as a heat-polymerized resin, the release film softens and deforms due to heat, so that the desired performance is exhibited. Therefore, care must be taken when using the dental release material composition of the present invention when using a heat-polymerized resin.

  In the dental release material composition of the present invention, organic pigments and inorganic pigments are used in order to make it easy to visually understand that the release material composition is applied to the plaster model within a range that does not impair the release properties. May be added. In addition, aggregates such as light stabilizers, antioxidants, fine particle inorganic oxides, organic polymer particles, organic / inorganic composite particles may be added for viscosity adjustment.

  The dental release material composition of the present invention is dissolved in an organic solvent used in the composition in an amount of 1% by weight or more as long as the handleability and release properties of the release material of the present invention are not impaired in addition to the above copolymer. Further, it may contain a polymer or oligomer whose polar group is not the main constituent. Examples of these compounds include synthetic polyisoprene, polybutadiene, and polybutyl.

  As described above, the release material composition of the present invention can be particularly preferably used as a dental release material composition. However, metals and metals other than dental use, resins and metals, resins and resins, resins and inorganics can be used. It is not limited as long as it can be suitably used in a mold release operation for general industrial use such as oxide.

[Example]
Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.

Test method A copolymer mass obtained by treating a polyolefin copolymer at 180 ° C. and 1 atm for 45 minutes, or adjusting the solvent content to 0.5% by weight or less, was 3 mm in length and 30 mm in width with a cutter knife. The specimen was cut to a height of 10 mm to prepare a bending test piece. The produced bending test piece is 20mm span and 2mm / min crosshead speed using Shimadzu small tabletop testing machine EZ ・ Test (manufactured by Shimadzu Corporation) equipped with tooth shaped push rod B and bending test jig for broken core JIS. Then, a three-point bending test was performed under the temperature condition of room temperature (23 ° C.), and the bending elastic modulus was obtained by the least square method for a test number of 5 or more with a test force of 0.1 N to 0.2 N.

  A plaster model having the shape shown in FIG. 1 was prepared and used for a mold release test. That is, a gypsum model 1 having an upright shape of a cylinder having a diameter of 10 mm and a height of 10 mm is formed at the center of a square prism (30 mm × 30 mm square section) having a height of 20 mm. The coating layer 3 and the body paste 4 were sequentially laminated to form a jacket crown 5 (opaque coating layer + body paste layer). FIG. 1 shows a cross-section cut by a plane that passes through the central axis of the cylinder and is perpendicular to the side surface of the regular quadrangular prism after the lamination.

ENB-EPD manufactured by Mitsui Chemicals Co., Ltd. which is 95 g of toluene and ethylene / propylene / 5-ethylidene-2-norbornene copolymer rubber (unvulcanized) in a 200 mL Erlenmeyer flask
M (4010) [non-conjugated diene content: 8.0 wt%, ethylene content (ASTMD3900): 59 wt%, ML (1 + 4) 100 ° C .: 8, flexural modulus: 0.03 N / mm ² ] 5 g After the addition, the solution was sealed and stirred at room temperature using a magnetic stirrer until ENB-EPDM (4010) was dissolved to obtain a toluene solution in which 5% by weight of ENB-EPDM (4010) was dissolved. It was. This toluene solution was put in a bottle and used for an experiment.

After collecting 2 to 3 drops of the above solution in a dappen dish, apply the solution evenly to the gypsum model 1 in FIG. 1 using a Superbond C & B brush, leave it at room temperature for 1 minute, volatilize toluene, and ENB-EPDM. A release material film 2 of (4010) was formed. On top of this, opaque (A3-O) 3 of Newmecolor Infice (manufactured by Sun Medical Co., Ltd.), which is a hard resin for dental crowns, was applied without being left uncoated, and a visible light irradiator α-Light II ((Co., Ltd.) was applied. ) And polymerized for 30 seconds. Next, body paste (A3-B) 4 was placed in a thickness of about 1.5 mm so as to hide the opaque, and then photopolymerized with α-Light II for 3 minutes to prepare a model of jacket crown 5. When I tried to release this jacket crown model from the plaster model by hand, I was able to easily remove the jacket crown model from the plaster model.

ENB-EPDM (4021) manufactured by Mitsui Chemicals, which is an ethylene / propylene / 5-ethylidene-2-norbornene copolymer rubber (unvulcanized) [non-conjugated diene content: 8.0% by weight,
Ethylene content (ASTMD3900): 51% by weight, ML (1 + 4) 100 ° C: 21, flexural modulus: 0.51
N / mm ² ] and a toluene solution of 5 wt% ENB-EPDM (4021) was prepared in the same manner as in Example 1.

  Further, when a jacket crown model of New Meta Color Inphis was produced and released by the same method as in Example 1, the jacket crown model could be easily released from the gypsum model.

ENB-EPDM (14030) manufactured by Mitsui Chemicals, which is an ethylene / propylene / 5-ethylidene-2-norbornene copolymer rubber (unvulcanized) [non-conjugated diene content: 8.0 wt%
, Ethylene content (ASTMD3900): 51% by weight, ML (1 + 4) 100 ° C .: 27, flexural modulus: 0.4
9N / mm ² ] and a toluene solution of 5 wt% ENB-EPDM (14030) was prepared in the same manner as in Example 1.

  Further, when a jacket crown model of New Meta Color Inphis was produced and released by the same method as in Example 1, the jacket crown model could be easily released from the gypsum model.

ENB-EPDM (3012P) manufactured by Mitsui Chemicals, which is an ethylene / propylene / 5-ethylidene-2-norbornene copolymer rubber (unvulcanized) [non-conjugated diene content: 4.5% by weight
, Ethylene content (ASTMD3900): 72% by weight, ML (1 + 4) 100 ° C. 15: flexural modulus: 1.0
0N / mm ² ] was used to prepare a toluene solution of 5 wt% ENB-EPDM (3012P) in the same manner as in Example 1.

  Furthermore, when a jacket crown model of New Meta Color Inphis was prepared and released by the same method as in Example 1, a little force was required for release, but the jacket crown model was released from the plaster model. did it.

A-1050S manufactured by Mitsui Chemicals, which is an ethylene / butene binary copolymer [MFR (190 ° C.): 1 g / 10 min, density (23 ° C.): 862 kg / m ³ , flexural modulus: 0.52 N / mm ² Was used in the same manner as in Example 1 to prepare a 5 wt% A-1050S toluene solution.

  Further, when a jacket crown model of New Meta Color Inphis was produced and released by the same method as in Example 1, the jacket crown model could be easily released from the gypsum model.

P-0480 manufactured by Mitsui Chemicals, which is an ethylene / propylene copolymer [MFR (190 ° C.) 1: g / 10 min, density (23 ° C.): 870 kg / m ³ , flexural modulus: 0.53 N / mm ² ] Was used to prepare a 5 wt% P-0480 toluene solution in the same manner as in Example 1.

  Further, when a jacket crown model of New Meta Color Inphis was produced and released by the same method as in Example 1, the jacket crown model could be easily released from the gypsum model.

A-4050S (MFR (190 ° C.): 3.6 g / 10 min, density (23 ° C.): 863 kg / m ³ , flexural modulus: 0.40 N / mm ^2, manufactured by Mitsui Chemicals, Inc., which is an ethylene / butene copolymer. In the same manner as in Example 1, a 5 wt% A-4050S toluene solution was prepared.

  Further, when a jacket crown model of New Meta Color Inphis was produced and released by the same method as in Example 1, it was found that the jacket crown model could be easily released from the gypsum model.

[Comparative Example 1]
A powder of Matsukaze Tissue Conditioner (manufactured by Matsukaze Co., Ltd.) was mixed and adjusted according to the instruction, and collected in a polyethylene container having a length of 5 mm, a width of 40 mm, and a height of 15 mm. After curing, the sample was cut into 3 mm length, 30 mm width and 10 mm height with a cutter knife to prepare a bending test piece. The produced bending test pieces were subjected to a three-point bending test at room temperature with a span of 20 mm and a crosshead speed of 2 mm / min using a Shimadzu small desktop testing machine EZ • Test (manufactured by Shimadzu Corporation). As a result of obtaining the bending elastic modulus by the least square method between 2 N, it was found to be 0.3 N / mm ² .

  In addition, although this tissue conditioner hardening body is a flexible hardening body which has a bending elastic modulus comparable as ENB-EPDM (4021) of Example 2, it uses the hydrocarbon of Examples 1-6 as a structural component. Unlike a non-polar copolymer, it is a polar cured product having an ester group.

  After adding 95 g of acetone and 5 g of the above-mentioned tissue conditioner cured body to a 200 mL Erlenmeyer flask, seal tightly and stir at room temperature using a magnetic stirrer until the tissue conditioner cured body is dissolved. An acetone solution in which the cured tissue conditioner was dissolved was obtained. When this acetone solution was put into a bottle and a jacket crown model of New Meta Color Infis was prepared and released by the same method as in Example 1, the jacket crown model could not be easily released from the gypsum model, It was found that even if the polymer had the same degree of flexibility as in Example 2, it could not be released from a polymer containing a polymer having an ester group that is a polar group.

[Comparative Example 2]
95 mL of acetone in a 200 mL Erlenmeyer flask and Primalloy manufactured by Mitsubishi Chemical Corporation [A1500: polyester-based airmer having flexibility and rubber elasticity, density: 970 kg /
After adding 5 g of m ³ ], it was sealed and stirred at room temperature using a magnetic stirrer until A1500 was dissolved to obtain an acetone solution in which 5% by weight of A1500 was dissolved.

  Except for using this acetone solution, a jacket crown model of New Meta Color Inphis was prepared and released by the same method as in Example 1. However, the jacket crown model could not be released from the plaster model, and the coating was flexible. It has been found that even if the polymer has elasticity and rubber elasticity, it cannot be released by using a polymer having an ester group which is a polar group.

[Comparative Example 3]
Add 95 g of purified water and 5 g of sodium alginate to a 200 mL Erlenmeyer flask, seal tightly and stir at room temperature using a magnetic stirrer until sodium alginate is dissolved, and 5 wt% sodium alginate dissolves An aqueous solution was obtained.

  Except for using this aqueous solution, a jacket crown model of New Meta Color Inphis was prepared and released by the same method as in Example 1, but the jacket crown model could not be released from the gypsum model.

A Teflon (TM) mold with holes 30 mm long, 30 mm wide and 3 mm high was placed on a transparent glass plate. Immediately polymerizable resin metafast (made by Sun Medical Co., Ltd., powder is used in pink) adjusted at a powder liquid weight ratio of 3/2 was poured into this hole, then both sides of the Teflon (TM) mold were made with transparent glass. Was cured with a sandwich between and a cured body (A) was produced. A 5% wt% A-1050S toluene solution prepared in Example 5 was applied to the entire cross section (length 30 mm × width 30 mm) of the cured body and dried to form an A-4050S film. A Teflon (TM) mold with a 5 mm diameter and 10 mm high hole in the shape of a cylinder is placed on the coated surface, and an immediate polymerizable resin metafast adjusted at a powder liquid weight ratio of 3/2 is placed therein. Was poured and cured. After curing, a cured body in which a columnar cured body (B) was joined to the cured body (A) was obtained except for the Teflon (TM) mold. (A)
And (B) were peeled off by hand, and as a result of carrying out a release test, it was found that (A) and (B) were released.
[Comparative Example 4]
In Example 8, except that the toluene solution containing A-4050S was not used, a release test was performed in the same manner as in Example 8. As a result, it was difficult to release (A) and (B). I understood.

  The entire surface of a 30 mm long, 30 mm wide, 3 mm high cross section (30 mm long x 30 mm wide) entire surface of the SUS plate is sandblasted with 50 μm particle size alumina to make the SUS surface uneven, and then ultrasonically cleaned. Washed and dried.

A 5% wt% A-1050S toluene solution prepared in Example 5 was applied to the sandblast surface and dried to form an A-4050S coating.
A Teflon (TM) mold with a 5 mm diameter and 10 mm high hole in the shape of a cylinder is placed on the coated surface, and an immediate polymerizable resin metafast adjusted at a powder liquid weight ratio of 3/2 is placed therein. Was poured and cured. After curing, a test piece in which a cylindrical resin cured body was bonded to a SUS plate was obtained except for the Teflon (TM) mold. As a result of releasing the SUS plate and the cured resin body by hand and performing a release test, it was found that the release was performed.
[Comparative Example 5]
In Example 9, a release test was performed in the same manner as in Example 9 except that the A-4050S toluene solution was not used. As a result, it was found that the SUS plate and the cured resin body were difficult to release.

  A toluene solution of 5% wt% A-1050S prepared in Example 5 was applied and dried on the entire cross section (length 30 mm × width 30 mm) of a gypsum plate 30 mm long, 30 mm wide and 3 mm high to make A-4050S. A film was formed. 0.3 g of porcelain mud of Noritake super porcelain AAA E1 (manufactured by Noritake Dental Supply Co., Ltd.) composed of water and porcelain powder was placed in a hemisphere and condensed.

After condensation, the interface between gypsum and porcelain mud was peeled off with a spatula and a mold release test was performed. As a result, gypsum and porcelain mud could be released in a hemispherical form.
[Comparative Example 6]
In Example 10, the mold release test was performed in the same manner as in Example 10 except that the A-4050S toluene solution was not used. As a result, the moisture of the porcelain mud was absorbed into the gypsum and the hemispherical porcelain was left as it was. It turned out to be difficult to release.

FIG. 1 shows an embodiment in which the dental release material composition of the present invention is applied.

Explanation of symbols

1: Gypsum model 2: Release material coating 3: Opaque coating layer 4: Body paste 5: Jacket crown

Claims (7)

  A dental release material composition, wherein a polyolefin copolymer containing at least a structural unit derived from ethylene and a structural unit derived from an α-olefin having 3 to 20 carbon atoms is dissolved in an organic solvent.   The dental release material composition according to claim 1, wherein the copolymer further comprises a structural unit derived from a non-conjugated diene.   The dental release material composition according to claim 1 or 2, wherein the constituent unit derived from ethylene in the copolymer is an amount of 1 to 90% by weight. A test piece of 3 mm length, 30 mm width and 10 mm height made from the copolymer was subjected to a three-point bending test at room temperature, a span interval of 20 mm, and a crosshead speed of 2 mm / min. The dental release material composition according to any one of claims 1 to 3, wherein a bending elastic modulus obtained by a least square method is 5 N / mm ² or less.   The dental release material composition according to any one of claims 1 to 4, wherein the organic solvent has a boiling point in the range of 50 to 200 ° C under 1 atm.   The dental release material composition according to any one of claims 1 to 5, wherein the copolymer is contained in an amount of 1 to 30% by weight. The dental release material composition is used for release between dental materials composed of at least one material selected from the group consisting of dental resin materials, dental metal materials, and dental inorganic materials. The dental release material composition according to any one of claims 1 to 6, wherein the dental release material composition is used.

Images