JP2003038527A - Artificial tooth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an artificial tooth produced by injection molding which is kept from slipping off dentures for a longer time even under repeated occlusion and chewing along with an aesthetic nature by achieving a higher adhesiveness to the dentures made of various synthetic resins. SOLUTION: An outer layer formed by injection molding is laminated on the surface excluding at least the base bottom surface of a body part formed by the injection molding out of at least one type of resin selected from the group consisting of cyclic nylon 12, polyethylene telephthalate, polyether sulfone and polymethyl methacrylate, which has at least one type selected from the group consisting of a powdery inorganic filler, organic and inorganic composite fillers, glass fibers and wiskers dispersed and/or compounded therein.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial tooth.
Things. More specifically, the invention relates to injection molding
Of synthetic resin artificial teeth having a multilayer structure
Is what you do. 2. Description of the Related Art Dentures such as full dentures and partial dentures
As artificial teeth used for teeth, artificial teeth using synthetic resin
Is often used. This artificial tooth resembles a natural tooth
In general, a resin layer with different color tones has a multilayer structure.
Have been used. Such artificial teeth include, for example, color
Polymethylmethax adjusted in tone for the artificial tooth body
Polymerate of PMMA and liquid monomer
Liquid obtained by mixing methyl methacrylate (MMA)
The rice cake of the type is charged between the pressing molds for the main body,
After press molding, the rice cake is polymerized and cured.
Place the shaped body in the pressure mold for the enamel layer,
PMMA powder and MMA adjusted for enamel layer
And a rice cake-like material obtained by mixing
After that, it can be roughly obtained by polymerizing and curing the rice cake.
You. In such press molding, the necessary rice cake
If even a small amount is insufficient, the formed artificial tooth will be chipped
I do. Conversely, if there is too much rice cake, parting of the mold
It protrudes from the line and generates burrs, etc.
Post-processing such as stripping is required. [0003] However, there is no lack and no protrusion
It is difficult to use the right amount and press
Add more mochi to apply enough pressure and mold the mochi
Post-processing to remove the burrs etc.
It is usual to do. As post processing, barrel polishing
Adopted. The main body is molded and the generated burrs
Polishing removes the surface of the main body to some extent.
Even if removed, form an enamel layer on the main body
In doing so, there is no particular problem, but deburring the enamel layer
When performing barrel polishing, if barrel polishing is excessive,
Mel layer, that is, the surface of the artificial tooth is shaved and the surface gloss
Will disappear. Therefore, deburring is complete
However, it does not impair the gloss of the surface of the artificial tooth.
Polish the barrel to a small extent and remove the remaining burrs one by one
Is currently being removed and the form is being modified.
is there. Therefore, in the manufacture of artificial teeth by press molding,
It takes a long time, requires skilled personnel, and productivity
It is low and the product cost has to be high. [0004] For these reasons, polycarbonate,
Polysulfone, polyethersulfone, acrylic, etc.
It is proposed to mold artificial teeth by injection molding
(See JP-A-9-220241). Synthesis of these
Production by manufacturing artificial teeth by injection molding of resin
High efficiency, saving labor in deburring, etc.
There is an advantage that cost can be reduced. [0005] Artificial production of synthetic resin by the press molding described above.
Synthetic resin artificial teeth by tooth or injection molding (hereinafter referred to as
Unless otherwise, these are called "artificial teeth." With floor)
The denture is made of a synthetic resin denture base (hereinafter, referred to as the base) of the artificial tooth.
Unless otherwise specified, it is called "denture base." )
It is made by bonding both. However, each of these
The type of artificial tooth depends on the combination of the material and the denture base material.
The adhesion does not appear or the adhesion is poor
(Hereinafter, unless otherwise noted, adhesion is poor.)
You. For example, a polycarbonate artificial tooth is a polycarbonate
Adhesion to the denture base of Nate, but to the denture base of PMMA
Without adhesion, the artificial tooth easily falls off the denture base
Become. Naturally, PMMA artificial teeth are
Adhere to the denture base of A. [0006] As described above, the artificial tooth and the denture base are generally both
If the user is a synthetic resin of the same material, the two
It is good. Materials of artificial teeth and denture base are different
If this is the case, for example,
By forming the undercut holding holes, the inside of the holding holes
The resin for the floor penetrates into the part and the protrusion for mechanical fitting
Part is provided, and the human
It is possible to prevent the tooth from falling off. But
The peripheral edge of the artificial tooth embedded in the denture base and the surface of the protrusion
A discontinuous boundary or gap between the
Occlusion and mastication are repeated so that it is near the base of the protrusion
Stress concentrates, the part is damaged in a relatively short time, and the denture
The artificial teeth will fall off the floor. In addition, it is embedded in the denture base
If there is a gap around the artificial tooth, food residues, saliva
Liquids, bacteria and the like will enter. Buried in the denture base
Even if there is no gap around the artificial tooth, they are not bonded to each other
Because of this, stress caused by bite or chewing, or hot food, etc.
Expansion between denture base and artificial tooth due to contact with body and oral temperature
Rate between the artificial tooth and the denture base
Food residue, saliva, bacteria, etc. As a result,
The teeth will be colored and smell bad. SUMMARY OF THE INVENTION [0007]
High productivity, labor saving in deburring, etc., low cost
The advantages of injection molded artificial teeth that can be
And adheres to any denture base, regardless of the denture base material
There is a need for artificial teeth having good properties. The present invention
It was created as a result of earnest research in view of the
Good adhesion of various synthetic resins to the denture base.
From the denture base for a long period of time even after repeated bite and mastication
Injection molding that does not fall off and has aesthetics etc.
For the purpose of providing artificial teeth manufactured by shape
I have. [0008] In order to solve the above problems,
In addition, the present invention relates to the injection-molded synthetic resin main body,
Outside of synthetic resin injection molded except at least the base surface
An artificial tooth in which layers are laminated, wherein the main body part is a ring.
Nylon 12, polyethylene terephthalate, polyether
-Tersulfone, from the group of polymethyl methacrylate
Fill at least one selected resin with inorganic powder
Material, organic-inorganic composite filler, glass fiber, whisker
At least one selected from the group was dispersed / composited
It is characterized by consisting of People by this injection molding
Dental teeth have high productivity and can save labor in deburring etc.
The advantages of injection-molded artificial teeth
Good adhesion of various synthetic resins to denture base
Even after repeated bite and mastication, the denture base can be
There is no risk of falling off. In addition, the stress caused by occlusion and mastication,
Or the coefficient of thermal expansion due to contact with hot foods and oral body temperature
Of the denture base in the exposed body of the artificial tooth
At the interface between the artificial tooth and the denture base
There is no gap between these boundaries, so food remains between these interfaces.
Smell, saliva, bacteria, etc. invaded, colored, or smelled bad
There is no danger. The outer layer can be injection molded and aesthetic
What is necessary is just to employ | adopt the suitable synthetic resin excellent in etc. The following is a further explanation. Artificial tooth of the present invention
At least on the base surface, a circular nylon 12, polyethylene
Renterephthalate, polyether sulfone, polymer
At least one selected from the group of chill methacrylates
Powder (hereinafter referred to as resin for the main body)
Filler, organic-inorganic composite filler, glass fiber, whis
At least one selected from a group of cars
For composite fillers. ) Is dispersed / composited.
The composite filler table for the exposed main body
The surface is represented by a commonly used silane coupling agent, etc.
Surface treatment allows the contact of various synthetic resins with the denture base.
Improves adhesion and eliminates the risk of artificial teeth falling off over time
No. [0010] Powdered inorganic material in the filling composite for the main body
As the filler, particulate powder is preferred because of easy handling.
However, the present invention is not limited to this.
There may be. The details will be described later. Further, the organic material in the filling composite material for the main body portion
The inorganic composite filler refers to the powdered inorganic filler and meta
Mixed with acrylate or acrylate monomer
Thereafter, polymerization and then pulverization are exemplified. Details
Details will be described later. As glass fiber, there is no problem in injection molding.
It is necessary to use short fibrous material.
In addition to improving adhesion to the tooth bed, heat resistance and dimensions of the body
There is an advantage that stability can be improved. For more information,
It will be described later. [0013] Whiskers are either inorganic or metallic.
There may be a diameter or length that does not hinder injection molding.
To improve the toughness of the main body.
There are points. As described above, the resin for the main body is combined with the composite for the main body.
Due to the dispersion and compounding of the filler, the bending of artificial teeth
Improve mechanical properties such as grinding strength, hardness and dimensional stability
It will be. Among them, good dimensional stability
By this, the shape of the mold can be reproduced more faithfully,
As a result, there is little danger of peeling off at the lamination interface with the outer layer.
It is preferable because it disappears. And this artificial tooth
By laminating the main body and outer layer integrally by extrusion molding
Be more manufacturable and greatly reduce manual work such as deburring
Can be mass-produced with high productivity.
You. The outer layer is in contact with the main body by injection molding.
Select synthetic resin with required mechanical properties
Is done. The outer layer is one or more laminated,
What is necessary is just to adjust the color tone by adding a necessary coloring agent. More specifically, the outer layer includes a main body.
Use the same resin as the part or a resin mixture with the same composition.
Therefore, it is preferable to self-adhere to the main body by injection molding.
Good. Therefore, as the resin of the outer layer, cyclic nylon 1
2. Polyethylene terephthalate, polyether sulf
Or polymethyl methacrylate, or a group thereof
More appropriately selected polymer blend used for body
It is adopted based on the resin composition. For the outer layer resin,
Powdered inorganic filler as well as dispersed and compounded in the main body
Material, organic-inorganic composite filler, glass fiber, whisker
At least one selected from the group
Is also good. When there is only one outer layer, the outer layer is
Become. In the enamel layer, it is necessary to make the color similar to natural teeth
Are added. Embodiments of the present invention will be described below.
The present invention will be described in detail. Of course, this invention
It is not limited by the following embodiments. Figure
1 is a cross-sectional view of an example of the artificial tooth of the present invention,
Shown as the first molar. The first molar 1 shown in FIG.
2 and an enamel layer 3 as an outer layer.
It was formed. In this first molar 1
The main body 2 includes a base surface 1a of the first molar 1 and the base
Following the surface 1a, it is exposed in the side collar at the narrow width.
Shown as not covered by the enamel layer 3
ing. The exposed main body 2 is shown in FIG.
And embedded in the denture base 4 as described above. This
As a result, the exposed main body 2 of the first molar 1
And denture base 4 are adhered to each other.
Between the adhesive interface between the first molar 1 and the denture base 4
Garbage, saliva, bacteria, etc. infiltrate, color, or smell bad
There is no danger. The first mortar shown in FIG.
Tooth 1 is enamelled to the position corresponding to the cervical line of the natural tooth
Preferably, it is coated with a layer 3. FIG. 2 is a sectional view of another example of the artificial tooth of the present invention.
And shown as upper central incisors. Shown in FIG.
The central incisor 11 also includes a main body 12 and an outer enamel layer 13.
And is formed by injection molding into a two-layer structure. This
In the central incisor 11, the main body 12 is
The base surface 11a and a part of a side surface continuing from the base surface 11a.
In addition, the enamel was greatly exposed on the lingual side 14
Shown as not being coated with layer 13. This
When the central incisor 11 is buried in the denture base,
And the main body 12 is partially exposed,
The main body 12 can be seen from the outside even when wearing dentures
There is no. In these artificial teeth, the main body is injection-molded,
Next, the enamel layer is injection molded and laminated with the main body.
Even if it is made to be manufactured by injection molding the enamel layer,
Next, the main body is injection molded and laminated with the enamel layer.
Alternatively, it may be manufactured as follows. Suitable for base plane
Provide appropriate holding holes, grooves, etc. to mechanically adhere to the denture base.
It goes without saying that it may be made to be raised. Powdered inorganic filler used in the present invention
As quartz powder, alumina powder, silica powder,
Phosphorus powder, talc powder, calcium carbonate powder, barium
Aluminosilicate glass powder, titanium oxide powder, ho
Examples include silicate glass powder and colloidal silica powder
You. The average particle size of these powdery inorganic fillers is 0.0
It is preferably from 0.5 to 50 μm. Average particle size is 0.005μm
If less, the bulk is large and the specific surface area is extremely large.
In addition, uniform mixing with the resin for the main body takes a long time. Ma
Also, for example, the mechanical strength of the main body is not sufficiently improved.
This is not preferred. When the average particle size exceeds 50 μm
Large particles, for example, lack of luster on the surface
Worsening, plaque adheres to the fallout of the powdered inorganic filler
Discoloration due to wearing or coloring of food etc.
Is not preferred. And these powders
The filler material is prepared by using a coupling agent as described below.
It is preferable to use a surface-treated one. This
In addition, silica powder is inexpensive and has abrasion resistance and workability.
Is preferred. The organic and inorganic substances used in the present invention
As the composite filler, the above-mentioned powdery inorganic filler and meta
Mix with acrylate or acrylate monomers
After that, it is polymerized and then pulverized.
As methacrylate monomers, methyl methacrylate
, Alkyl methacrylate, alicyclic / aromatic / heterocyclic
And vinyl group-containing methacrylate, hydroxy (alcohol
Xy) containing methacrylate, di and trimethacrylate
G, carboxylic acid-containing methacrylate, dialkylamino
Ethyl methacrylate, fluoroalkyl methacrylate
Is exemplified. Even more specifically, methyl methacrylate
Rate, ethyl methacrylate, n-butyl methacrylate
I-butyl methacrylate, t-butyl methacrylate
Rate, 2-ethylhexyl methacrylate, cyclohexyl
Xyl methacrylate, benzyl methacrylate, 2-
Hydroxyethyl methacrylate, 2-hydroxypro
Pill methacrylate, dimethylaminoethyl methacrylate
, Diethylaminoethyl methacrylate, glycidide
Methacrylate, tetrahydrofurfuryl methacrylate
, Ethylene glycol dimethacrylate, 1,3-
Butylene glycol dimethacrylate, diethylene glycol
Cole dimethacrylate, triethylene glycol dime
Tacrylate, polyethylene glycol dimethacrylate
G, 1,6-hexanediol dimethacrylate, tri
Methylolpropane trimethacrylate is exemplified.
Also, instead of the above methacrylate,
Is exemplified. In addition, methacrylate according to these
Or the above monomer if it is an acrylate monomer
It is not limited to this. These methacrylates
Or acrylates are not limited to monomers but oligomers
A mixture of monomers and oligomers
You may. As an example of the organic-inorganic composite filler,
Powdered inorganic filler, methacrylate or
A monomer of a relevant substance, a polymerization catalyst described later, for example,
Peroxide such as zoyl peroxide, azobisisobuty
Azo compounds such as lonitrile, coupling agents, and
Colorants, oxidation stabilizers, UV absorbers, pigments, dyes
And the like are added as appropriate, mixed with stirring, and
Polymerized at ℃, average particle size of 1-50μm by ball mill
It is possible to adopt what is obtained by grinding to the degree
Wear. When the average particle size is less than 1 μm, the specific surface area is large.
It takes a long time to mix uniformly with the resin for the main body.
In addition, the moldability deteriorates. Also, for example, if it is an artificial tooth
It is preferable because the mechanical strength etc. is not sufficiently improved
Absent. If the average particle size exceeds 50 μm, the particles will be large.
For example, the surface of an artificial tooth lacks luster and feels tongue
Also worsens, in the part where powdered organic and inorganic fillers fall off
Transformation due to adhesion of plaque or pigments such as food
It is not preferable because colors are seen. In addition, powdery inorganic
Filler material was previously surface-treated with a coupling agent.
Or directly with coupling agent and methacrylate
Or acrylate monomer
May be used. The glass fiber has an average diameter of 5 to 30 μm and a length of
Is preferably 0.1 to 1.0 mm. Glass
The average fiber diameter is less than 5 μm and the length is less than 0.1 mm
Has a large specific surface area and is evenly mixed with the resin for the main body.
It takes a long time in
Not good. The average diameter exceeds 30 μm and the length is 1.0
If it exceeds mm, the fiber can be confirmed visually and impair the aesthetics.
Is not preferred. And the glass fiber will be described later
Surface-treated with a coupling agent etc.
It is preferable to use As the whiskers, alumina whiskers are used.
ー, beryllium oxide whiskers, boron carbide whiskers
ー, silicon carbonate whisker, silicon nitride whisker, various gold
Genus whiskers and the like are exemplified. Whiskers have a diameter of 0.
1-20.0 μm, preferably 1-100 μm in length.
Good. Whisker diameter less than 0.1 μm, length 1
If it is less than μm, the specific surface area becomes large,
It takes a long time to mix uniformly, and the moldability deteriorates
This is not preferred. The diameter exceeds 20μm and the length is
If it exceeds 100 μm, it will damage the mold and impair the aesthetics.
This is not preferred. And whiskers
Surface treated with a coupling agent as described below
It is preferable to use one. As the coupling agent, an organophane
Classical silane coupling agent, titanate cup
Examples include ring agents and zircoaluminate coupling agents
Is shown. Organofunctional silane coupling agent
Γ-methacryloxypropyl trimethoxy
Sisilane, γ-glycidoxypropyltrimethoxysila
, Vinyltrichlorosilane, vinyltriethoxysila
, N-β (aminoethyl) γ-aminopropyl trim
Toxisilane, N-β (aminoethyl) γ-aminopro
Pyrmethyldimethoxysilane, γ-chloropropyltri
Methoxysilane, γ-aminopropyltriethoxysila
And the like. As the titanate coupling agent,
Sopropyl triisostearoyl titanate, isopro
Pyrtolidedecylbenzenesulfonyl titanate, iso
Propyl tris (dioctyl pyrophosphate) tita
, Tetraisopropylbis (dioctylphospha
It) titanate, tetraoctylbis (ditridecyl)
(Phosphite) titanate, tetra (2,2-diallyl)
Oxymethyl-1-butyl) bis (di-tridecyl) pho
Sphyte titanate, bis (dioctylpyrophosph
Oxyacetate titanate, bis (dioctyl)
Rupyrophosphate) ethylene titanate, isopro
Piltrioctanoyl titanate, isopropyl dimeta
Crylisosteoyl titanate, isopropyl iso
Stearoyl diacryl titanate, isopropyl tri
(Dioctyl phosphate) titanate, isopropyl
Tricumylphenyl titanate, isopropyl tri (N
-Aminoethyl-aminoethyl) titanate, dicumyl
Phenyloxyacetate titanate, diisostearo
Ilethylene titanate and the like are exemplified. As a zircoaluminate coupling agent
Alcohol cab Komodo (CAVCO MO
D: CAVEDON CHEMICAL CO. , IN
C. ), Glycol-based cabcomodo (CAVCOMM)
OD: CAVEDON CHEMICAL CO. , I
NC. Manufactured). As a polymerization catalyst, heating weight
Preference initiators are preferred. Benzene is used as the thermal polymerization initiator.
Zoyl peroxide, ketone peroxide, pau
Xyketal, hydroperoxide, dialkyl par
-Oxide, diacyl peroxide, peroxye
Organic peroxides such as steal and peroxydicarbonate
And 2,2′-azobisisobutyronitrile, 2,2 ′
-Azobis-2,4-dimethylvaleronitrile, 4,
4'-azobis-4-cyanovaleric acid, 1,1'-
Azobis-1-cyclohexanecarbonitrile, dimethyl
2,2'-azobisisobutyrate, 2,2'-a
Zobis- (2-aminopropane) dihydrochlorite, etc.
And the like. These heat polymerization type initiators
May be used alone or in combination of two or more. In addition, polymerization touch
Needless to say, a photopolymerization initiator or the like can be used as the medium.
Nor. Other surface treatment agents include mercapto
Examples thereof include silane and aminosilane. EXAMPLES Next, examples will be shown together with comparative examples, and further details will be described.
I will explain it. In the following Examples and Comparative Examples,
Using the materials shown in each example, injection molding
A sample to be used for the part is prepared and the bending strength
Test, Vickers strength test, synthetic tree used for denture base
An adhesive strength test with a fat was performed as follows. <Bending strength test> Sample (2 mm × 2 mm ×
25mm) with sandpaper # 1000
And subjected to a bending strength test. The test is based on JIS T6514
Universal testing machine (AUTOGRAPH AGS-50)
0D, manufactured by Shimadzu Corp.)
Speed) = 1mm / min, distance between supporting points under test =
The test was performed with the length set to 20 mm, and the bending strength
I asked for degrees. ## EQU1 ## Σ _b3 : 3-point bending strength (MPa) F: Maximum load when the sample breaks (N) L: Distance between supporting points under test (mm) W: Width of sample (mm) T: Thickness of sample (mm) <Vickers hardness test> Sample (φ10mm
× 6mm) surface with sandpaper # 1000
Polished and mirror-finished by buffing
It was subjected to a Curth hardness test. The test is a small Knoop (Vicca)
S) Hardness tester (HMV-2000, Shimadzu Corporation)
According to JIS B7734, a load of 50 g,
Hold time 30 seconds, Vickers based on the following formula
The hardness was determined. [Mathematical formula-see original document] HV: Vickers hardness F: Test load (N) d: Average of diagonal length of recess (mm) <Crack test> Sample (φ10 mm × 6 mm)
After boiling for 1 hour in accordance with JIS T6506, methyl methyl
Instantaneous contact with TMA (MMA)
Presence or absence is checked visually and with a microscope (20x)
did. This is because the residual stress remains inside due to boiling.
To test the contact effect of MMA on various samples
You. In the evaluation, ◎ indicates that no crack was generated,
○: Cracks hardly occurred, ×: Cracks were noticeable
One thing. <Adhesive strength test> Materials shown in each Example
Into a mold for upper central incisors to produce test teeth,
As shown in FIG. 3, a line connecting the cut end of the test tooth 21 and the cervical part
Is fixed to the resin base 22 so that the angle is about 45 °.
A sample 23 was prepared, and a load was applied in the direction of the arrow.
JIS T6506 for adhesive strength between resin 1 and resin base 22
It measured according to. For the adhesive strength test, a universal testing machine (AU
TOGRAPH AGS-500D, Shimadzu Corporation
And the speed at which the load is applied is at a head speed of 1.
0 mm / min. Polymethylmeta on resin stand
Acrylate (PMMA), polycarbonate (PC),
Three floor materials of polysulfone (PS) were used. What
In the comparative example, a commercially available maxillary central incisor was used as a test tooth.
Was. Samples based on each floor material are prepared as follows
did. <(1) Sample using PMMA floor material>
The bottom surface of the test tooth and the lower part of the side
After polishing to a clean surface with paper # 600, clean with warm water.
Was cleaned. Next, as shown in FIG.
The line connecting the incision and the cervix will be at an angle of about 45 °
Seaweed in a test wax mold 24 and a flask with anhydrite 25
After embedding (see FIG. 4 (b)), wax was flown and the resulting polymerization
The inside of the gypsum mold was washed with boiling water. Buried in divided plaster mold
Two-pack type dental silane on the exposed surface of the test tooth
Coupling agent (trade name; GC Ceramic Primer)
-, Manufactured by GC Corporation).
Powdered liquid mixed with PMMA and MMA in plaster mold after cloth
Type of rice cake-like material, 90 minutes in hot water of about 70 ° C
Immersion in boiling water for 30 minutes
The test teeth were adhered to a resin base to obtain a sample. <(2) Sample using PC flooring material> Test
Sandpaper the base of the tooth and the lower part of the side that follows the base.
After polishing to a clean surface with a paper # 600, clean with warm water.
Was. Next, production of a sample using the PMMA floor material
Similarly, the line connecting the incision of the test tooth and the cervical region has an angle of about 45 °.
The wax in the test wax mold so that the
After embedding in a sco, it was waxed and the resulting gypsum mold for injection molding was obtained.
The inside was washed with boiling water. Buried in split plaster mold
On the exposed surface of the test tooth, a two-pack type dental silane coupling
Agent (trade name: GC ceramic primer,
(Made by GC Corporation).
And then melted at 300 ° C in the combined gypsum mold cavity
Inject the PC and glue the test teeth to the resin base to make a sample
Was. <(3) Sample using PS floor material> For floor
Other than using PS as the material, the above-mentioned PC floor material was used.
A sample using the PS floor material was prepared in the same manner as the sample
Was. PS was melted at 300 ° C. (Example 1) As a resin for the main body, a ring 12 was used.
Nylon, powdered inorganic filler as composite filler for body
Uses fine silica powder with an average particle size of 0.016μm
did. The silica fine powder is γ-methacryloxypropyl
Coupling treated with Rimethoxysilane
It is. 100 parts by weight of the resin for the main body and for the main body
Weigh 10 parts by weight of the composite filler, and at 250 ° C
Melt the fat, mix and stir, then inject into the mold
From the obtained, the bending strength, Vickers strength,
The above test was carried out by cutting out a solvent test sample. Profit
The bending strength, Vickers strength and solvent resistance of the sample
It is as shown in Table 1. In the same manner as described above, the resin
Weighing 10 parts by weight of the composite filler for the main part and the
Melt the resin for the body at ℃, mix and stir, then
Injection into incisor mold to produce test teeth for adhesive strength test
Then, using this, PMMA, P
The adhesive strength between the resin stand of C and PS and the test teeth was measured.
The obtained test teeth and PMMA, PC, PS resin stand
The adhesive strength is as shown in Table 1. Example 2 PMM as a resin for the main body
A, the same composite filler as in Example 1 as the main body composite filler
used. 100 parts by weight of the resin for the main body and the main body
Weigh 10 parts by weight of composite filler for the main body at 250 ° C
Melt resin, mix and stir, then inject into mold
The bending strength and the bit
Cut out a test sample for curl strength and solvent resistance and
Test was carried out. Flexural strength and Vickers strength of the obtained sample
The degree and the solvent resistance are as shown in Table 1. In the same manner as above, the resin for the main body is 100
Weighing 10 parts by weight of the composite filler for the main part and the
Melt the resin for the body at ℃, mix and stir, then
Injection into incisor mold to produce test teeth for adhesive strength test
Then, using this, PMMA, PC,
The adhesive strength between the resin base of PS and the test teeth was measured. Get
Of the test teeth and PMMA, PC, PS resin base
The strength is as shown in Table 1. (Example 3) Polyester as a resin for the main body
Tersulfone, Example 1 as composite filler for main body
The same was used. 100 parts by weight of the resin for the main body
And 10 parts by weight of the composite filler for the main body are weighed,
Melt the resin for the main body at ℃, mix and stir, and then
From the one obtained by injecting into the mold,
Cutting test specimens for brushing strength, Vickers strength and solvent resistance.
Out and tested. The bending strength,
Vickers strength and solvent resistance are as shown in Table 1. Also, as described above, the resin for the main body is 100
Weighing 10 parts by weight of the composite filler for the main part and
Melt the resin for the body at ℃, mix and stir, then
Injection into incisor mold to produce test teeth for adhesive strength test
Then, using this, PMMA, PC,
The adhesive strength between the resin base of PS and the test teeth was measured. Get
Of the test teeth and PMMA, PC, PS resin base
The strength is as shown in Table 1. Example 4 Polyethylene was used as the resin for the main body.
Example of lentephthalate, composite filler for main body
The same one as 1 was used. 100 weight resin for body
Weighed and 10 parts by weight of the composite filler for the main body,
Melt the resin for the main body at 50 ° C, mix and stir,
Then, the same as in Example 1 was obtained from the product obtained by injection into the mold.
, Bending strength, Vickers strength, solvent resistance test sample
And the above test was conducted. Flexural strength of the obtained sample
The degree, Vickers strength and solvent resistance are as shown in Table 1.
is there. In the same manner as described above, the resin
Weighing 10 parts by weight of the composite filler for the main part and the
Melt the resin for the body at ℃, mix and stir, then
Injection into incisor mold to produce test teeth for adhesive strength test
Then, using this, PMMA, PC,
The adhesive strength between the resin base of PS and the test teeth was measured. Get
Of the test teeth and PMMA, PC, PS resin base
The strength is as shown in Table 1. [Table 1] (Embodiment 5) Embodiment 2 is used as a resin for the main body.
The same PMMA as the following, and the following
An organic-inorganic composite filler was used. That is, no organic matter
The material composite filler is finely divided silica 1 having an average particle size of 16 nm.
00 parts by weight, 5 parts of methyl methacrylate as a monomer
0 parts by weight, γ-methacryloxyp as a coupling agent
6.7 parts by weight of ropirtrimethoxysilane, a polymerization catalyst and
Weigh 0.5 parts by weight of benzoyl peroxide,
Stir and mix, heat polymerize at 90 ° C, then powder in mortar
It is crushed. 100 parts by weight of resin for the main body and above
10 parts by weight of the composite filler for the main body is weighed and heated at 260 ° C.
Melt the resin for the main body, mix and stir, and then
The bending strength was obtained from the material obtained by injection in the same manner as in Example 1.
Cut out test samples for temperature, Vickers strength and solvent resistance
The above test was carried out. Flexural strength of the sample obtained, Vicca
The base strength and the solvent resistance are as shown in Table 1. In the same manner as described above, the resin for the main body 100
Weighing 10 parts by weight of the composite filler for the main part and
Melt the resin for the body at ℃, mix and stir, then
Injection into incisor mold to produce test teeth for adhesive strength test
Then, using this, PMMA, PC,
The adhesive strength between the resin base of PS and the test teeth was measured. Get
Of the test teeth and PMMA, PC, PS resin base
The strength is as shown in Table 1. (Example 6) Example 2 as a resin for the main body
Same PMMA as, average diameter as composite filler for body
Glass fiber having a length of 10 μm and a length of 0.2 mm was used.
100 parts by weight of the resin for the main body and composite filling for the main body
Weigh 20 parts by weight of material and melt main body resin at 260 ° C
And mixed and stirred, and then injected into the mold to obtain
The bending strength and Vickers strength were the same as in Example 1.
Degree, the above test was performed by cutting out a test sample for solvent resistance
Was. Flexural strength, Vickers strength, solvent resistance of the obtained sample
The properties are as shown in Table 2. In the same manner as described above, the resin
Weighing 20 parts by weight of the composite filler for the main part and
Melt the resin for the body at ℃, mix and stir, then
Injection into incisor mold to produce test teeth for adhesive strength test
Then, using this, PMMA, PC,
The adhesive strength between the resin base of PS and the test teeth was measured. Get
Of the test teeth and PMMA, PC, PS resin base
The strength is as shown in Table 2. (Embodiment 7) Embodiment 2 as a resin for the main body
The same PMMA as the above, a composite filler for the main body having a diameter of 0.1
Silicon carbide whis of 3 to 0.6 μm and length of 5 to 15 μm
I used a car. 100 parts by weight of the resin for the main body and the above
Weigh 10 parts by weight of the composite filler for the main body and apply it at 270 ° C.
Melt the resin for body part, mix and stir, then put in the mold
From the one obtained by injection, the bending strength was the same as in Example 1.
Cut out test samples for temperature, Vickers strength and solvent resistance
The above test was carried out. Flexural strength of the sample obtained, Vicca
The base strength and the solvent resistance are as shown in Table 2. In the same manner as described above, the resin for the main body 100
Weighing 10 parts by weight of the composite filler for the main part and
Melt the resin for the body at ℃, mix and stir, then
Injection into incisor mold to produce test teeth for adhesive strength test
Then, using this, PMMA, PC,
The adhesive strength between the resin base of PS and the test teeth was measured. Get
Of the test teeth and PMMA, PC, PS resin base
The strength is as shown in Table 2. (Comparative Example 1) Artificial made of commercially available PMMA
After boiling the teeth for 1 hour, add methyl methacrylate (MMA)
Instantly contact and visually check for cracks in the sample
Confirmed with a scope (20x), same as the crack test described above
The solvent resistance was evaluated as described above. The results are shown in Table 2.
It is. The central incisor in this artificial tooth is used as the test tooth.
As in the first embodiment, a resin base for PMMA, PC, and PS
The adhesive strength between the test tooth and the test tooth was measured. The obtained test tooth and P
Table 2 shows the adhesive strength of MMA, PC and PS to the resin base.
It is shown. (Comparative Example 2) From commercially available polycarbonate
Solvent resistance in the same manner as in Comparative Example 1 using artificial teeth
Tests for properties and adhesive strength were conducted. The results are shown in Table 2.
It is. Comparative Example 3 Composed of commercially available polystyrene
Using artificial teeth, in the same manner as in Comparative Example 1, solvent resistance and contact resistance were measured.
A test of strength was performed. The results are as shown in Table 2.
You. [Table 2] According to the present invention, as described in detail above,
Configuration, the following effects can be achieved.
I do. That is, the artificial tooth of the present invention has high productivity,
Labor saving and cost reduction in deburring etc.
The advantages of injection-molded artificial teeth are
Good adhesion of synthetic resin to denture base, falling off for a long time
There is no risk of occlusal or chewing stress,
Is the coefficient of thermal expansion due to contact with hot foods and oral body temperature.
The gap between the artificial tooth and the denture base opens due to differences, etc.
Food residue, saliva, bacteria, etc.
There is no danger of coloring or offensive odor. Above all,
Because of the multilayer structure made by injection molding of synthetic resin,
By appropriately selecting the raw materials used for the layer structure,
Artificial teeth with mechanical properties and esthetics
It can be provided at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of an artificial tooth according to the present invention. FIG. 2 is a cross-sectional view showing another embodiment of the artificial tooth of the present invention. FIG. 3 is an explanatory diagram of a test method for determining the adhesive strength between an artificial tooth and a denture base according to the present invention. 4 is an explanatory view for producing a sample using the artificial tooth of the present invention used in the test method shown in FIG. [Explanation of Signs] 2, 12 Main body 1a, 11a Base surface 3, 13 Enamel layer

Claims (1)

Claims: 1. An artificial tooth comprising an injection-molded synthetic resin main body laminated to an injection-molded synthetic resin outer layer excluding at least a base surface, wherein the main body is made of an injection-molded synthetic resin. Is a cyclic nylon 12, polyethylene terephthalate, polyether sulfone, at least one resin selected from the group of polymethyl methacrylate,
An artificial tooth comprising at least one selected from the group consisting of a powdery inorganic filler, an organic-inorganic composite filler, glass fiber, and whiskers, dispersed and composited.