JPH0624539B2 - Dental personal tray and its manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dental individual tray used in a manufacturing process of a denture base or the like used in dental treatment, and a manufacturing method thereof.

[Prior Art] Taking a preliminary impression with a ready-made tray, obtaining a diagnostic model,
The method of making a final impression by making a personal tray on a model is a method that is generally performed in the field of dental prosthesis, not only for denture bases but also for inlays, crowns and bridges. However, in the description of the present invention, the denture base is taken up for the sake of convenience, and the rest is based on the manufacturing method of the individual tray for the denture base.

Among the steps of manufacturing the denture base, the steps up to the manufacturing of the individual tray are shown in FIGS. 1 to 4. Here, FIG. 1 is a perspective view of a gypsum diagnostic model, and FIG. 2 is a perspective view showing a state in which the diagnostic model is covered with a space paraffin wax, and a personal tray material is pressed onto the diagnostic model. The figure shows A ₁ -B of the material for personal tray and paraffin wax part in Fig. 2.
FIG. 4 is a cross-sectional view taken along line _{1 and} FIG. 4 is a cross-sectional view when an impression material is placed on an individual tray.

Conventionally, as the material for the personal tray 3, a shrack compound containing aluminum as a filler, an acrylic heat-polymerized resin, and a vinyl chloride board have been used,
Currently, powder-liquid type room temperature polymerization acrylic resins for trays are mainly used.

In the case of using the room temperature polymerization acrylic resin for a tray, first, in order to provide a space for the impression material 4, the diagnostic model 1 is covered with a paraffin wax 2 having a thickness of 1.5 to 2.0 mm. In order to prevent the tray material 3 from sticking to the paraffin wax 2, the surface of the wax 2 is sprinkled with French chalk. Next, after a specified amount of acrylic resin powder and liquid is kneaded into a putty, a sheet with a thickness of 1 to 2 mm is formed to cover the diagnostic model 1 and is pressed against the diagnostic model 1 to form a personal tray. Prepare the form of 3 and wait for the resin to cure, remove it from the diagnostic model 1 and remove it from the personal tray 3
And Depending on the impression material 4 used, the impression material 4 may be peeled off from the individual tray 3 and deformed. Therefore, a large number of small holes may be formed with a carbide bar or the like for maintaining the impression material 4. Using the individual tray 3 thus manufactured, a precise final impression of the patient is obtained, and a more accurate working model is manufactured. After that, occlusal floor production, occlusal sampling, articulator attachment, artificial tooth arrangement, wax denture oral trial fitting and adjustment, gingiva formation, wax denture embedding, flowing wax, resin separating agent application, resin dosing, resin filling, resin The steps of heat polymerization, removal of the polymerized denture, and polishing are performed to produce the final denture base to be attached to the patient.

[Problems to be Solved by the Invention] However, as a room temperature polymerized acrylic resin for a powder-liquid type tray that is generally used for producing an individual tray 3 for producing a denture base, polymethylmethacrylate (PMMA) is used. A powder in which an appropriate amount of a polymerization initiator such as benzoyl peroxide is mixed therein and a liquid in which a polymerization accelerator such as N, N-dimethyl-p-toluidine (DMPT) is added to a methyl methacrylate monomer (MMA) are formed into bubbles. Knead so that it does not mix, and with the appropriate hardness, 1
Impression material 4 made into a sheet shape of ~ 3mm Paraffin wax for a space of 1.5-2.0mm 2
The diagnostic model 1 covered with is pressed into the shape of the personal tray 3 and is used as the personal tray 3 after polymerization and curing. In the commonly used powder-liquid type room temperature polymerization acrylic resin for trays, Immediately after mixing the powder and liquid, it is too soft or sticky, so it is difficult to even form it into a sheet, but on the other hand, the operating time is short and the curing reaction starts immediately, so the sheet is used. It is necessary to create a personal tray with a satisfactory shape by pressing the test piece onto the diagnostic model in a short time. However, the room temperature polymerization acrylic resin for trays is somewhat elastic when it is in a dough-like state, and it returns elastically even if pressed before the completion of polymerization.
It is difficult to fit the model with your fingers. Further, the personal tray 3 produced is filled with the impression material 4 and sent into the oral cavity,
It is used to obtain the final impression by pressing it in the correct position, but when pressing it, it deforms due to the pressure, or while the impression material is fixed until it hardens, when it is taken out later. It should not be transformed into. Therefore, the manufactured individual tray 3 needs to have strength and elastic modulus that are not deformed during the above process. On the other hand, since the personal tray 3 is a device that is fed into the oral cavity, it must have a thickness that reduces the feeling of foreign matter in the oral cavity, and there is a limit to the thickness, up to about 3 mm. . However, a commonly used polymer of a room temperature polymerized acrylic resin having a thickness of 1 to 3 mm does not have both strength and elastic modulus so as not to be deformed during the above process.

Therefore, it is difficult to obtain sufficient compatibility with a denture base prepared by taking a final impression using a personal tray 3 manufactured using a conventional room temperature polymerization acrylic resin for trays.

[Means for Solving the Problems] Therefore, in view of the above-mentioned conventional problems, the present inventors have an advantage in that it is easy to handle at the time of pressure contact with a diagnostic model and has a long operation time.
Dental personal tray and its manufacturing method that can be accurately fitted to the model by pressure welding, and can be hardened in a short time when it is desired to harden, and even if the hardened body is thin, it does not deform when taking the final impression and gives an accurate impression As a result of earnest studies, the present invention has been achieved by focusing on the use of photopolymerizable FRP.

That is, the present invention relates to an unsaturated polyester resin containing a photopolymerization initiator, or a photopolymerizable fiber-cured plastic obtained by impregnating fibers with a radical polymerizable monomer and / or radical polymerizable oligomer containing a photopolymerization initiator ( Dental personal tray made of photopolymerizable FRP), and unsaturated polyester resin containing photopolymerization initiator, or radical polymerizable monomer and / or radical polymerizable oligomer containing photopolymerization initiator were impregnated into fibers. The present invention provides a method for producing a personal dental tray by using a photopolymerizable fiber reinforced plastic (photopolymerizable FRP) for a personal dental tray and polymerizing it by irradiation with actinic rays.

As the unsaturated polyester resin, an unsaturated acid such as maleic anhydride or fumaric acid is always contained as one component, and a saturated polybasic acid such as phthalic anhydride or isophthalic acid is used in combination with propylene glycol or ethylene glycol. An unsaturated alkyd obtained by esterification with a polyhydric alcohol such as is dissolved in the following radically polymerizable monomer is used.

Examples of the radical-polymerizable monomer and oligomer include acrylic acid ester, methacrylic acid ester, ethylenically unsaturated compounds such as monohydric or polyhydric alcohol having an ethylenically unsaturated bond, urethane-acrylate copolymer, urethane- Examples thereof include a methacrylate copolymer or a reaction product of bisphenol A and glycidyl (meth) acrylate. Further, two or more of these radically polymerizable monomers and oligomers can be mixed and used.

More specifically, styrene, vinyltoluene, methyl (meth) acrylate, alkyl (meth) acrylate such as ethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, and (meth) acrylic. Acid-2-
Hydroxypropyl, ethylene glycol di (meth) acrylate, propylene glycol (meth) acrylate, polyethylene glycol di (meth) acrylate,
Polypropylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, hexylene glycol di (meth) acrylate, 2,2-bis [4
-(Meth) acryloyloxyphenyl] propane,
2,2-bis [4- (meth) acryloyloxycyclohexyl] propane, 2,2-bis [3- (meth) acryloyloxy-2-hydroxypropoxyphenyl]
Examples include monomers and oligomers such as propane, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and 4- (meth) acryloyloxyethoxycarbonylphthalic anhydride.

The photopolymerization initiator contained in the unsaturated polyester resin or the radically polymerizable monomer and / or the radically polymerizable oligomer is composed of a photosensitizer and a reducing agent, and as the photosensitizer,
An α-ketocarbonyl compound is used. Examples of the α-ketocarbonyl compound include α-diketone, α-ketoaldehyde, α-ketocarboxylic acid, and α-ketocarboxylic acid ester. Among the above α-ketocarbonyl compounds, α-diketones having excellent stability are preferable. α
Among the diketones, diacetyl, benzyl and camphorquinone are particularly preferred.

The α-ketocarbonyl compound is used in an amount of 0.001 to 10% by weight, preferably 0.05 to 5% by weight, based on the total amount of unsaturated polyester resin or radically polymerizable monomer and / or radically polymerizable oligomer. It

When the amount of the α-ketocarbonyl compound is less than 0.001% by weight, a sufficient photosensitizing effect cannot be obtained, and when the amount exceeds 10% by weight, the photosensitizing effect is not further improved, which is meaningless. In addition, the storage stability of the obtained photopolymerizable FRP is low, which is not preferable. Examples of the reducing agent include N, N
-Dimethylaniline, N, N-diethylaniline, N,
N-dibenzylaniline, N, N-dimethyl-p-toluidine, N, N-diethyl-p-toluidine, N, N-
Dimethyl-m-toluidine, p-bromo-N, N-dimethylaniline, m-chloro-N, N-dimethylaniline, p-dimethylaminobenzaldehyde, p-dimethylaminoacetophenone, p-dimethylaminobenzoic acid, p- Dimethylaminobenzoic acid ethyl ester, p-dimethylaminobenzoic acid amino ester, N, N-dimethylanthranilic acid methyl ester, N, N-dihydroxyethylaniline, N, N-dihydroxyethyl-p-toluidine, p -Dimethylaminophenethyl alcohol, p
-Dimethylaminostilbene, N, N-dimethyl-3,
5-xylidine, 4-dimethylaminopyridine, N, N
-Dimethyl-α-naphthylamine, N, N-dimethyl-
β-naphthylamine, tributylamine, tripropylamine, triethylamine, N-methyldiethanolamine, N-ethyldiethanolamine, N, N-dimethylhexylamine, N, N-dimethyldodecylamine,
Tertiary amines such as N, N-dimethylstearylamine, N, N-dimethylaminoethylmethacrylate, N, N-diethylaminoethylmethacrylate, 2,2 '-(n-butylimino) diethanol; 5-butylbarbiturics , 1-benzyl-5-phenylbarbituric acid and other barbituric acids, and further 7-diethylamino-4-methylcoumarin, 7-diethylamino-4-methylcoumarin, which the applicant has already filed.
Aminocoumarin compounds such as dimethylamino-4-ethylcoumarin (see Japanese Patent Application No. 62-206232).
m-dimethylaminophenylmethylcarbinol (see Japanese Patent Application No. 62-206233), p-dimethylaminocinnamonitrile, o-dimethylaminocinnamonitrile, etc. (see Japanese Patent Application No. 62-206235). Substituted aromatic amines; dansylglycine, dansyl-L
-Amino-substituted naphthalenesulfonyl compounds such as valine, dansyl-L-leucine and dansyl-L-phenylalanine (see Japanese Patent Application No. 62-206234). These known reducing agents can be used in the form of one kind or a mixture of two or more kinds, and the reducing agent is 0.001 to 10% by weight with respect to the total amount of the radically polymerizable monomer and / or the radically polymerizable oligomer. %, Preferably 0.05 to 5% by weight.

If the reducing agent is less than 0.001% by weight, a sufficient reducing effect cannot be obtained, and if it exceeds 10% by weight, the storage stability of the obtained photopolymerizable FRP is low, which is not preferable.

As the fiber, it is possible to use glass fiber, carbon fiber, graphite fiber, aramid fiber, vinylon fiber, tetron fiber, etc., but a glass fiber that has a good balance of actinic ray transmission, economic efficiency and mechanical strength. preferable.

The form of the fiber may be any of roving, mat, cloth, etc., and the weave method for the cloth is plain weave, plain plain weave,
Either twill weave or Yonago weave may be used.

Known materials such as polyester and silane coupling agents may be used as the fiber binder and surface treatment agent.

The ratio of unsaturated polyester resin or radically polymerizable monomer and / or radically polymerizable oligomer impregnated in the fiber depends on the type and morphology of the fiber, and further, unsaturated polyester resin or radically polymerizable monomer and / or radical polymerizable oligomer type and Depending on the viscosity, etc.,
Generally, the weight ratio of (fiber) / unsaturated polyester resin or radical-polymerizable monomer and / or radical-polymerizable oligomer) is about 0.05 to 1.0, and the photopolymerizable FRP on the diagnostic model 1 is The pressure may be adjusted so that it has a consistency that makes it easy to operate.

The unsaturated polyester resin or radical-polymerizable monomer and / or radical-polymerizable oligomer used in the present invention may further contain other components, if necessary, such as a low-shrinking agent, a powdery filler, a thickener, a polymerization regulator. It is also possible to add a polymerization inhibitor, a pigment, and the like.

The form of the photopolymerizable FRP used in the present invention may be a sheet form or a bulk form, but the bulk form is finally made into a sheet form for the purpose of producing a personal tray having a uniform thickness. Since it is necessary, the sheet form is preferable. In the case of sheet-like photopolymerizable FRP, impression material 4
If holes with a diameter of 1 to several mm are drilled to maintain (Fig. 4), when a non-adhesive impression material such as silicone is used, after hardening, many small holes will be drilled again with a carbide bar. It is convenient to skip the operation.

Photopolymerizable F for use in making the dental personal tray of the present invention
RP is a halogen lamp, similar to conventional photopolymerizable materials,
It can be photopolymerized by an actinic ray having a light source such as a xenon lamp, a fluorescent lamp or sunlight. The temperature during photocuring is usually in the range of 0 to 60 ° C., preferably 5 to 50 ° C., and the time of light irradiation is usually 1 second to 7 minutes.

The dental individual tray of the present invention is manufactured on a diagnostic model made of gypsum, but when the individual tray for all dentures is manufactured, the photopolymerizable FRP is diagnosed without providing a space for impression material with parfin. In the case of direct pressure contact with the working model, it is preferable to apply a solution type or wax type resin separating agent on the diagnostic model in order to facilitate the release of the individual tray after fabrication.

[Examples] Hereinafter, the present invention will be described in more detail with reference to Examples, but it will be apparent that the present invention is not limited to these Examples.

Example 1 (Production of Photopolymerizable FRP) 2,2-bis [4- (3
-Methacryloxy-2-hydroxypropoxy) -phenyl] propane 90 parts by weight and triethylene glycol dimethacrylate 10 parts by weight, camphorquinone 0.2% by weight and 7-diethylamino-4- as a photopolymerization initiator.
1.0% by weight of methylcoumarin was added and mixed to obtain a photopolymerization initiator-containing radically polymerizable monomer. Asahi Fiber Glass Co., Ltd. glass fiber as a fiber base material, Glassron Continuous Strand Mat M8609
-300 (weight: 300 g / m ² ) was used, the fiber base material was impregnated with the above radical polymerization monomer containing a photopolymerization initiator, both sides were covered with a polyethylene film, and then pressure was applied with a roller from above the film. Then, the impregnation was promoted and defoaming was sufficiently performed, and the material was wound into a predetermined length to obtain a sheet-shaped material. The glass fiber content of the produced sheet FRP is 2
8% and the thickness was 0.8 mm.

Example 2 (Production of individual tray made of photopolymerizable FRP) The photopolymerizable FRP produced in Example 1 was preliminarily formed with a number of small holes having a diameter of 2 mm, and the peripheral edge portion was 2 mm from the denture base contour line excluding the posterior palate edge. After moving to the retracted position, the model was pressed against the maxillary edentulous jaw model (Nissin 402U) coated with a resin separating agent to cut off excess photopolymerizable FRP, and then the visible light irradiator was left on the model. Put it in the Zoryo Lab Lite LV-I),
It was irradiated with light for 5 minutes to make a 0.8 mm thick individual tray. Since this FRP was photopolymerizable, it had a sufficient operation time during pressure contact and did not adhere to fingers.

A tray compound was wrapped around the entire edge (excluding the posterior edge of the palate) of this individual tray, and after the tray compound had softened, it was pressed against the maxillary edentulous model to form the impression edge again. After that, a silicone impression material was placed on the tray and pressed against the maxillary edentulous jaw model to obtain a final impression, but the silicone impression material was not peeled off or the tray was not deformed at the time of obtaining. Subsequently, an outer wall of wax was formed around the tray after the impression was taken, gypsum was injected into the impression surface, and after the gypsum was hardened, the surrounding wax was removed to produce a working model. A base floor is manufactured on this work model with a base plate, waxed up on the base floor, artificial teeth are arranged, and then buried by the conventional method, and then flow-flowed to heat-polymerize the resin (Akron MC: manufactured by Jizo). Then, microwave polymerization was performed for 3 minutes in a microwave oven to produce an upper denture base. The gap between the denture base and the model (Nissin 402U) was measured 1 hour and 1 week after production to evaluate compatibility.

The result is shown in FIG.

Comparative Example 1 Acrylic polymer powder obtained by adding 1.0 part by weight of benzoyl peroxide (BPO) to 100 parts by weight of polymethylmethacrylate (PMMA) and N, N-dimethyl-p-toluidine in 100 parts by weight of methylmethacrylate monomer (MMA). A sheet having a thickness of about 1 mm and about 2 mm is obtained by kneading an acrylic monomer added with 0.5 part by weight of (DMPT) at a polymer / monomer ratio (weight ratio) = 7/3 for about 30 seconds to make a dough-like cake. The edgeless part of the denture base excluding the posterior edge of the palate and retracted 2 mm from the contour line of the denture base. After that, it was polymerized at room temperature while being placed on the model to make individual trays with thicknesses of 0.8 mm and 1.5 mm. Immediately after the powder-liquid kneading, the room temperature polymerized resin adhered to the fingers and it was difficult to form a sheet, and the time during which the fingers could be pressed was about 2 minutes, and the operability was very poor. A small number of 2 mm diameter holes were made in this individual tray with a carbide bar, the tray compound was wrapped around the entire edge (excluding the posterior palate edge), and after the tray compound had softened, it was pressed against the maxillary edentulous model. , Impression edge was formed again. After that, a silicone impression material was placed on the tray, and the final impression was taken by pressing it against the maxillary edentulous jaw model, but the 0.8 mm thick tray is thin because it is thin, it deforms by bending,
Since an accurate impression could not be obtained, the subsequent steps were stopped. Thereafter, the tray having a thickness of 1.5 mm was subjected to the same operations as in Example 2 to manufacture an upper denture base. The gap between the denture base and the model (Nissin 402U) was measured 1 hour and 1 week after production to evaluate compatibility.

The result is shown in FIG.

In Comparative Example 1, the room-temperature-polymerized acrylic resin was somewhat elastic when the individual tray was manufactured, and it is considered that the room-temperature-polymerized acrylic resin was elastically returned at the time of press contacting, so that accurate final impression was not taken and a working model was not manufactured. In the maxillary denture base manufactured on the model, the gap between the palate portion 2 and the artificial tooth portions 1 and 3 is large and the compatibility is poor. In contrast, the photopolymerizable FRP of Example 2
The maxillary denture base manufactured on the working model made by taking the final impression with the individual tray made by the manufacturer has a small gap between the palate portion 2 and the artificial tooth portions 1 and 3 and has good compatibility. It is considered that this is because the photopolymerizable FRP does not deform when the individual tray is manufactured and when the final impression is taken.

As a result, it was revealed that the denture base manufactured using the individual tray manufactured by the manufacturing method of the present invention has excellent compatibility on the adhesive surface.

[Bending Test and Tensile Test] Example 3 The glass plate coated with the resin separating agent was pressure-contacted with the photopolymerizable FRP produced in Example 1 and placed in a visible light irradiator (Jansai Laborite LV-I) for 5 minutes. Irradiate light to ADA standard (N
o. 12 for denture base Polymers, J Am Dent Assoc, 9
0,451-458,1975) and the bending test piece of Fig. 7 and 8
Tensile test pieces shown in the figure were prepared, and each test piece was stored in water at 37 ° C. for 48 hours according to the ADA standard, and then subjected to a bending test and a tensile test. The bending test was a three-point bending test with a fulcrum distance of 50 mm, the tensile test was 50 mm between chucks, and the crosshead speed was 1 mm / min for both the bending test and the tensile test. Shimadzu Autograph IS-500 was used as the tester. The measurement results are shown in Table 1.

COMPARATIVE EXAMPLE 2 Waking up on a plaster model, burying in a conventional manner, pouring, and filling with room temperature polymerized acrylic resin having the same polymer / monomer ratio (weight ratio) = 7/3 as used in Comparative Example 1 Then, room temperature polymerization was performed to prepare a test piece having the same shape as that of Example 3, and a bending test and a tensile test were performed under the same conditions as in Example 3. The measurement results are shown in Table 1.

From the measurement results shown in Table 1, the individual tray of the present invention,
It is possible to manufacture products that have higher strength and elastic modulus than conventional room-temperature polymerization acrylic resin personal trays, do not deform when taking a final impression, are thinner than conventional personal trays, and have less feeling of foreign matter in the oral cavity. It is clear.

[Effect of the Invention] According to the dental individual tray using the photopolymerizable FRP of the present invention and the method for producing the same, since it is photopolymerizable, there is a margin in the operation time when pressure-contacting the diagnostic model, and the pressure-contacting After that, by putting it in a light irradiator and irradiating it with light, it is immediately cured, and a personal tray can be manufactured with very good operability. In addition, since the photopolymerizable FRP has sufficient strength and elastic modulus, it is possible to manufacture a thin personal dental tray with less feeling of foreign matter in the oral cavity, and the manufactured personal dental tray is As the final impression is not deformed, an accurate impression can be obtained, so that an accurate working model can be manufactured, and finally, a denture base excellent in mucosa compatibility can be manufactured.

[Brief description of drawings]

Fig. 1 is a perspective view of a diagnostic model made of gypsum made based on the impression of an alginate impression material, and Fig. 2 is a state in which the diagnostic model is covered with paraffin wax for space, and the material for personal tray is pressed onto it. Fig. 3 is a perspective view of Fig. 2 and A ₁ -B of the personal tray material and paraffin wax part of Fig. 2
FIG. 4 is a cross-sectional view taken along line _{1 and} FIG. 4 is a cross-sectional view when an impression material is placed on an individual tray. 5 and 6 are graphs showing the compatibility of the denture base, FIG. 7 is a bending test piece, and FIG. 8 is a drawing showing a tensile test piece.

Claims (2)

[Claims] 1. An unsaturated polyester resin containing a photopolymerization initiator, or a photopolymerizable fiber reinforced plastic in which fibers are impregnated with a radical polymerizable monomer and / or a radical polymerizable oligomer containing a photopolymerization initiator. Polymerizable FR
A personal dental tray, characterized in that it consists of P). 2. An unsaturated polyester resin containing a photopolymerization initiator, or a photopolymerizable fiber-reinforced plastic in which fibers are impregnated with a radical polymerizable monomer and / or radical polymerizable oligomer containing a photopolymerization initiator (photo Polymerizable FR
P) is used for a dental personal tray and is polymerized by irradiation with an actinic ray.