JP2003144459A - Method of manufacturing metal crown - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a metal crown reducing a burden at a treating site by facilitating the correction of bite shape while providing basic bite shape with a crown bite part molding material. SOLUTION: Only the top part of a model foundation 1 formed from a foundation 8 on a tooth root is crowned with a crown bite part molding material 10 formed of a thermoplastic plastic film 10' of crown shape, and a soft wax layer 14' is formed between the top face of the model foundation 1 and a covering part 12 having the bite shape 11 of the molding material 10 which covers the top face. The bite shape 11 is corrected by deforming the soft wax layer 14' while thermally deforming the local part of the covering part 12 with the bite shape 11 with a heated trowel 23. The outer peripheral surface of the model foundation 1 not crowned with the molding material 10 is covered with a wax form part 15' to form a crown forming composite material 16 integral with the molding material 10. A metallic material is substituted for the crown forming composite material 16 to manufacture the metal crown.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a metal crown that covers a base formed on a tooth root in the oral cavity.

[0002]

2. Description of the Related Art According to Japanese Patent Application Laid-Open No. 2001-61864, the applicant makes a model base from a base formed on a tooth root in the oral cavity, and a crown occlusion made of a plastic film having a shallow crown shape on the top of the model base. Part of the mold for molding occlusal part is covered with an adhesive, and the outer peripheral surface of the model base not covered with the mold for forming occlusal part of the crown is covered with wax to form a tooth integrated with the mold for forming occlusal part of the tooth. Forming a composite mold material for crown molding,
Provided is a method for producing a metal crown by substituting this composite mold material for molding a crown with a metal material.

The above-mentioned mold material for molding the occlusal part of the crown is made of a thermoplastic film and is heat-pressed to be molded into a shallow crown shape. Therefore, the purpose of using the thermoplastic film is to hot press-mold the above-mentioned crown occlusal part molding material.

Further, an example is shown in which soft wax is used as an adhesive when the crown occlusal part molding material is crowned on the model base. This soft wax is used for molding the model base and crown occlusal part molding material. It has a function as an adhesive to bond and a function to plastically deform the same type material when pressed against the model base so that it can be crowned in an appropriate posture.

[0005]

The above-mentioned molding material for molding the occlusal part of the crown has an advantage that an occlusal shape can be easily given without requiring the skill of a technician. For example, the occlusal shape of the posterior teeth is classified into several types of typical shapes, and a basic occlusal shape is given by the above-mentioned mold material for molding the occlusal part of the tooth. Was dealing with it by cutting.

However, there is a limit to the correction at the treatment site, and there are problems that the patient is forced to have poor occlusion and that the correction work is burdened.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a novel method for producing a metal dental crown that fundamentally solves the above problems.

In the method for producing a metal crown according to the present invention, a model base is made from a base formed on the root of the oral cavity, while a crown occlusal part forming mold material made of a thermoplastic film having a shallow crown shape is used. prepare.

The crown occlusal part forming mold material is capped on the model base through soft wax, and the space between the cover part having the occlusal shape of the mold part and the top surface of the model base covered by the cover part. A method for producing a metal crown, wherein a soft wax layer is formed on a substrate, and the soft wax layer is deformed while the local portion of the cover having the occlusal shape is thermally deformed by a heating iron to correct the occlusal shape and the metal is replaced. To adopt.

In the above-described method for producing a metal crown, a thermoplastic iron film is used to form a crown occlusal part molding material in cooperation with the plasticity and / or the heat melting property of the soft wax. The complicated occlusion shape can be easily corrected and the burden on the treatment site is reduced.

Further, there is prepared a mold material for molding the occlusal part of the crown, in which the soft wax is filled in advance and the opening surface of the mold material is sealed with a protective film. The protective film is peeled off from the crown occlusal part molding material to cover the top of the model base to form the soft wax layer. This contributes to maintaining the quality characteristics of the soft wax, optimizing the amount of soft wax, and optimizing the thickness of the soft wax layer.

As a suitable material for the above-mentioned thermoplastic film, Emmasoft (trade name, manufactured by Okamoto Co., Ltd.) containing ethylene methyl methacrylate as a main material is used.

This Emmasoft, that is, the Emmasoft film and the mold material for molding the occlusal part of the crown comprising the film are
It has suitable rigidity and elasticity and has a shape-retaining effect, and is suitable as a mold material for forming a dental occlusal part to be crowned on the model base.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

In FIG. 1A, reference numeral 10 denotes a mold material for forming a dental crown occlusal portion made of a plastic film. The mold material 10 is formed by subjecting a thermoplastic film 10 'to hot press molding.

The crown occlusal part molding material 10 is a cover part 12 having an occlusal shape 11 for covering the top surface of a model base 1 molded from a base formed on the tooth root in the oral cavity, and the cover part 12.
And a fitting portion 13 that is fitted to the peripheral surface of the top of the model base 1 and is erected from the peripheral edge portion of the model base 1. The covering portion 12 and the fitting portion 13 are integrally formed of a thermoplastic film 10 '. , The whole has a shallow crown shape.

The lower end surface 17 of the fitting portion 13 forms an angle α with the peripheral surface thereof at a substantially right angle.

The mold 10 for molding the crown occlusal part is heated and pressed by using a female mold 18 and a male mold 19 on a thermoplastic film 10 'as shown in FIG. A plurality of crown occlusal part forming mold members 10 press-molded on one film 10 'shown in the figure are obtained.

Next, as shown in FIG. 6C, the base of the fitting portion 13 is cut off from the side of the fitting portion 13 of the crown occlusal part forming mold 10 with a cutting tool to cut the bottom surface of the fitting portion 13. 17
Is separated from the film 10 'while forming the crown occlusion part molding material 10 at a substantially right angle to the peripheral surface thereof.

The thermoplastic film 10 '
As a suitable material, Emmasoft (trade name) manufactured by Okamoto Co., Ltd., which is mainly composed of ethylene methyl methacrylate and is used as a main material, 3 27-12 Hongo, Bunkyo-ku, Tokyo.

The above-mentioned Emmasoft contains approximately 80% (weight ratio) of ethylene methyl methacrylate (EMMA).
Polyethylene (PE) is mixed with about 20% (weight ratio), and suitable pigments and auxiliaries are further added.

This Emmasoft, that is, a film made of Emmasoft and a mold material for forming a dental occlusal part made of the film are
It has suitable rigidity and elasticity and has a shape-retaining effect, and is suitable as a mold material for forming a dental occlusal part to be crowned on the model base.

As described above, the shallow crown-shaped crown occlusal part molding material 10 made of the thermoplastic film 10 '.
On the other hand, as shown in FIG. 1B, the model base 1 is made from the base 8 formed on the tooth root in the oral cavity, and only the top of the model base 1 is intercalated with the soft wax 14 to form the crown occlusion. It is crowned with the part forming mold material 10.

The molding material 10 for molding the crown occlusal portion covers the top surface of the model base 1 with the covering portion 12 and the fitting portion 13
Surrounds the peripheral surface immediately below the top surface, and forms a soft wax layer 14 'between the top surface of the base 1 and the cover portion 12 of the same shape material 10. Similarly, the fitting portion 13 and the top surface of the base 1 are formed. A soft wax layer 14 'is formed between the surface immediately below and the peripheral surface.

As a preferred example, as shown in FIG. 3, the soft wax 14 is preliminarily filled in the inner cavity portion of the crown occlusal part molding die material 10 so as to be closely adhered to the inner peripheral surface of the inner cavity portion, The one whose opening surface is sealed with the protective film 24 is prepared.

The mold material 10 for molding the crown occlusal part is peeled off the protective film 24 to cover the top of the model base 1 to form the soft wax layer 14 '. This maintains the quality characteristics of the soft wax 14, and contributes to the optimization of the amount of the soft wax 14 and the optimization of the thickness of the soft wax layer 14 '. In addition, the technician's work of soft wax application will be reduced to speed up the work.

Next, as shown in FIG. 1C, the outer peripheral surface of the model base 1 which is not covered with the crown occlusal part forming mold 10 is covered with wax 15, preferably hard wax, and D As shown in the figure, the wax mold part 15 'is formed by cutting the margin part 4 which comes into contact with the gum, and the composite mold material 16 for crown molding which is integrated with the mold material 10 for molding the dental occlusal part is formed. Form.

The wax 15 forming the wax mold portion 15 'is the lower end surface 17 of the fitting portion 13 of the crown occlusal portion molding mold material 10 made of the thermoplastic film 10'.
It is applied so as to be in close contact with the (shear surface), that is, in close contact with the thick surface of the plastic film, so as not to project outward from the lower end surface 17 of the fitting portion 13.

That is, the wax mold part 15 'is in close contact with the outer peripheral surface of the model base 1 on which the crown occlusal part forming mold material 10 is not covered, and the crown occlusal part is raised by the soft wax layer 14'. The end face 17 of the fitting portion 13 of the molding die member 10 is brought into close contact with the end face 17 and is adjusted so as not to project outward from the end face 17.

As shown in FIG. 1E, the crown occlusal part forming mold 10 and the crown occlusal part forming mold 10
At the occlusal interface with the model tooth 20 corresponding to the above, interposing an occlusal paper 21 coated with transfer paint on both sides, by interlocking and sliding the coronal occlusal part forming mold material 10 and the model tooth 20, As shown in the figure, coloring 22 of the occlusal part is performed. That is, the defective occlusal part is specified.

Next, the colored part 22 which is a poor bite part of the dental crown occlusal part molding material 10 is touched or pressed by the heating iron 23, and the soft wax layer 14 'is deformed and specified by the colored part 22. A local portion of the covering portion 12 which is a defective occlusal portion is thermally deformed to correct the occlusal shape 11 suitable for actual occlusal portion.

The waxes 14 and 15 are easily melted by heat, and in particular, the soft wax 14 is rich in plasticity together with the heat melting property, that is, has a softness that is easily deformed under pressure.
The soft wax 14 having normal viscosity is preferably used.

The soft wax layer 14 'is plastically deformed following the thermal deformation of the cover 12 by touching or pressing by the heating iron 23, and / or is melted by heating by the heating iron 23 and has fluidity. Deform.

Next, as shown in FIG. 1G, the crown molding composite mold material 16 comprising the above-mentioned crown occlusal part molding mold 10 and the wax mold part 15 'is removed from the model base 1 and the sprue 5 is removed. Is attached to the crown occlusal part forming mold material 10.

Next, as shown in FIG. 2A, the crown molding composite mold material 16 provided with the sprue 5 is placed in the casting mold 6, and a molten metal 9 such as gold or silver is injected through the sprue 5. Then, the molten metal 9 is used to incinerate the crown molding composite mold material 16 to replace the molten metal 9.

Thus, the metal tooth crown 7 is completed as shown in FIG. As shown in Fig. C, the metal crown 7 is capped on a base 8 in the oral cavity and firmly attached with an adhesive.

[0037]

EFFECTS OF THE INVENTION According to the method for manufacturing a metal crown according to the present invention, the mold for molding the occlusal part made of a thermoplastic film is used to give a basic occlusal shape by the mold for forming the occlusal part of the crown. The plasticity and the plasticity or heat-melting property of the soft wax cooperate to facilitate the correction of the occlusal shape by the heating iron and reduce the burden at the treatment site.

Further, Emmasoft has appropriate rigidity and elasticity and has a shape-retaining effect, and is suitable as a mold material for forming a dental occlusal part to be crowned on the model base.

The mold material for molding the dental occlusal part in which the soft wax is encapsulated can maintain the quality characteristics of the soft wax and contribute to the optimization of the soft wax amount and the optimization of the thickness of the soft wax layer.

[Brief description of drawings]

1A to 1G are cross-sectional views for sequentially explaining a metal crown manufacturing method.

2A to 2C are cross-sectional views for sequentially explaining the manufacturing method subsequent to A to G in FIG.

FIG. 3 is a cross-sectional view showing another example of a mold material for molding a dental crown occlusal part used in a metal crown manufacturing method.

4A, 4B, and 4C are cross-sectional views sequentially illustrating a method of manufacturing a mold for forming a dental occlusal part used in the above-described metal crown manufacturing method.

[Explanation of symbols]

1 model base 4 Margin section 5 sprues 6 casting mold 7 metal crown 8 foundation 9 Molten metal 10 Mold material for crown occlusal part molding 10 'thermoplastic film 11 bite shape 12 Cover 13 Fitting part 14 Soft wax 14 'soft wax layer 15 wax 15 'wax mold 16 Composite mold material for crown molding 17 Lower end face of fitting part 18 female 19 male 20 model teeth 21 Articulating paper 22 Colored part that identifies occlusal defect 23 Heating iron 24 Protective film

Claims (3)

[Claims] 1. A model base is made from a base formed on a tooth root in the oral cavity, while a coronary occlusal part forming mold material made of a thermoplastic film having a shallow crown shape is prepared and used for forming the coronal occlusal part. A mold material is capped on the model base via soft wax to form a soft wax layer between a cover part having an occlusal shape of the same model material and a top surface of the model base covered by the cover part, and the bite shape Modify the occlusal shape by deforming the soft wax layer while thermally deforming the local part of the covering part with a heating iron, and further wax the model base outer peripheral surface not crowned with the crown occlusal part forming mold material. A method for producing a metal crown, which comprises covering to form a composite molding material for crown molding which is integral with the molding material for occlusal part of the crown and replacing the composite molding material for crown molding with a metal material. 2. A mold material for molding the occlusal occlusal part prepared by previously filling the soft wax and sealing the opening surface with a protective film, and peeling off the protective film from the mold material for the occlusal part of the crown occlusal part. 2. The method for producing a metal crown according to claim 1, wherein the soft wax layer is formed on the top of the model base by covering it. 3. The method for producing a metal crown according to claim 1, wherein Emmasoft (trade name, manufactured by Okamoto Co., Ltd.) containing ethylene methyl methacrylate as a main material is used as the thermoplastic film.