JP3607243B2 - Metal crown manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a metal crown to be placed on a base formed on a root of an oral cavity.
[0002]
[Prior art]
According to Japanese Patent Application Laid-Open No. 2001-61864, the applicant makes a model base from a base formed on the root of the oral cavity, and uses a plastic film-shaped dental occlusal part molding material that forms a shallow crown on the top of the model base. A composite mold material for forming a crown that is crowned with an adhesive and is coated with wax on the outer periphery of the model base that is not covered with the mold material for molding a crown occlusion. A metal crown manufacturing method is provided in which the composite mold for forming a crown is replaced with a metal material.
[0003]
The crown occlusal part molding material is made of a thermoplastic film, and is molded into a shallow crown shape by subjecting it to hot pressing. Therefore, the purpose of using the thermoplastic film is to hot press mold the crown occlusal part molding material.
[0004]
In addition, an example in which soft wax is used as an adhesive when a mold base for crown occlusion molding is put on the model base is shown. This soft wax is an adhesive that bonds the model base and the mold base for molding the crown occlusion. It functions as an agent and has the function of being deformed plastically when it is pressed against the model base and being crowned in an appropriate posture.
[0005]
[Problems to be solved by the invention]
The mold material for molding a crown occlusal portion has an advantage that an occlusal shape can be easily given without requiring a technician's skill. For example, the occlusal shape of the back teeth is classified into several types of typical shapes, and the basic occlusal shape is given by the above-mentioned mold material for molding the occlusal occlusion part. Was dealt with by cutting.
[0006]
However, there is a limit to the correction at the treatment site, which has a problem of forcing a patient to have a bad occlusion and a burden for a correction work.
[0007]
[Means for Solving the Problems]
The present invention provides a novel method for producing a metal crown that drastically solves the above problems.
[0008]
In the method for producing a metal crown according to the present invention, a model base is made from a base formed on a tooth root in the oral cavity, and a mold material for forming a crown occlusal portion made of a thermoplastic film having a shallow crown shape is prepared.
[0009]
Then, the dental crown occlusal portion molding mold is crowned on the model base via soft wax, and the soft wax is interposed between the cover portion having the occlusal shape of the same shape material and the top surface of the model base covered by the cover portion. A method of manufacturing a metal crown that forms a layer, deforms the soft wax layer while deforming the local portion of the covering portion having the occlusal shape with a heating iron to modify the occlusal shape, and replaces the metal is adopted. .
[0010]
The above-mentioned method for producing a metal crown is a complicated occlusion by a heating iron, in which the thermoplasticity of the mold for molding a crown occlusion part made of a thermoplastic film cooperates with the plasticity and / or heat melting property of soft wax. The shape can be easily modified to reduce the burden on the treatment site.
[0011]
In addition, a mold is prepared in which the soft wax is filled in the mold for molding the crown occlusal portion and the opening surface of the mold is sealed with a protective film. Then, the dental occlusal part molding mold is peeled off from the protective film and crowned on the top of the model base to form the soft wax layer. This maintains the quality characteristics of the soft wax and contributes to the optimization of the amount of soft wax and the thickness of the soft wax layer.
[0012]
Emmasoft (trade name, manufactured by Okamoto Co., Ltd.) mainly composed of ethylene methyl methacrylate is used as an appropriate material for the thermoplastic film.
[0013]
This Emmasoft, that is, an Emmasoft film and a crown occlusal part molding material made of the film has a moderate rigidity and elasticity and has a shape retaining effect, and is used for molding a crown occlusion part to be crowned on the model base. It is suitable as a mold material.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
[0015]
In FIG. 1A, reference numeral 10 denotes a mold material for forming a crown occlusal portion made of a plastic film, and the mold material 10 is formed by subjecting a thermoplastic film 10 'to hot press molding.
[0016]
The crown occlusal part molding mold 10 stands from a covering part 12 having an occlusal shape 11 covering the top surface of the model base 1 molded from a base formed on a tooth root in the oral cavity, and a peripheral part of the covering part 12. And a fitting portion 13 that is lowered and fitted to the top peripheral surface of the model base 1. The cover portion 12 and the fitting portion 13 are integrally formed of a thermoplastic film 10 ′, and the entire crown is shallow. Takes shape.
[0017]
The lower end surface 17 of the fitting portion 13 makes an angle α formed with respect to the peripheral surface thereof substantially at a right angle.
[0018]
For example, as shown in FIG. 4A, the mold material 10 for forming a crown occlusal portion is subjected to hot pressing using a female mold 18 and a male mold 19 on a thermoplastic film 10 'and is shown in FIG. A plurality of crown occlusal portion molding molds 10 press-molded on one film 10 'are obtained.
[0019]
Next, as shown in FIG. C, the base portion of the fitting portion 13 is cut by a blade from the side of the fitting portion 13 of the crown occlusal portion forming mold 10 so that the lower end surface 17 of the fitting portion 13 is The mold member 10 for forming the crown occlusion portion is separated from the film 10 'while being substantially perpendicular to the peripheral surface.
[0020]
Emmasoft (trade name) manufactured by Okamoto Co., Ltd., 3-27 27 Hongo, Bunkyo-ku, Tokyo, which is mainly composed of ethylene methyl methacrylate, is used as a suitable material for the thermoplastic film 10 '.
[0021]
The Emasoft is a mixture of ethylene methyl methacrylate (EMMA) in about 80 percent (weight ratio) and polyethylene (PE) in about 20 percent (weight ratio), and further added with appropriate pigments and auxiliaries.
[0022]
This Emmasoft, that is, an Emmasoft film and a crown occlusal part molding material made of the film has a moderate rigidity and elasticity and has a shape retaining effect, and is used for molding a crown occlusion part to be crowned on the model base. It is suitable as a mold material.
[0023]
As described above, a shallow crown-shaped occlusal part molding material 10 made of a thermoplastic film 10 'is prepared. On the other hand, as shown in FIG. 1B, a model base is formed from a base 8 formed on the root of the oral cavity. 1, and only the top of the model base 1 is covered with the above-described mold part 10 for forming the crown-and-occlusion portion through the soft wax 14.
[0024]
The crown occlusal portion molding mold 10 covers the top surface of the model base 1 with the cover portion 12, and surrounds the peripheral surface immediately below the top surface with the fitting portion 13. A soft wax layer 14 ′ is formed between the cover portions 12 of the mold member 10, and similarly, a soft wax layer 14 ′ is formed between the fitting portion 13 and the peripheral surface immediately below the top surface of the base 1.
[0025]
As a preferred example, as shown in FIG. 3, the soft wax 14 is pre-filled in the lumen of the crown occlusal portion molding mold 10 so as to be in close contact with the inner peripheral surface of the lumen, and the opening surface of the mold 10 Is prepared by sealing with a protective film 24.
[0026]
Then, the mold material 10 for molding the dental crown occlusion portion is peeled off from the protective film 24 and crowned on 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 optimizing the amount of the soft wax 14 and optimizing the thickness of the soft wax layer 14 '. In addition, the work of soft wax application by engineers will be reduced to speed up the work.
[0027]
Next, as shown in FIG. 1C, the outer peripheral surface of the model base 1 that is not crowned with the crown occlusal portion molding material 10 is covered with wax 15, preferably hard wax, and shown in FIG. In this manner, the margin part 4 that comes into contact with the gums is cut to form the wax mold part 15 ′, and the dental crown molding composite mold material 16 that is integral with the dental crown occlusal part molding mold 10 is formed.
[0028]
The wax 15 forming the wax mold portion 15 'is in close contact with the lower end surface 17 (shear surface) of the fitting portion 13 of the crown-occlusion portion molding mold 10 made of the thermoplastic film 10'. It adheres to the thick surface and is applied so as not to protrude outward from the lower end surface 17 of the fitting portion 13.
[0029]
That is, the wax mold portion 15 ′ is in close contact with the outer peripheral surface of the model base 1 where the crown occlusal portion molding mold 10 is not crowned, and is raised by the soft wax layer 14 ′. 10 is fitted to the end surface 17 of the fitting portion 13 and is adjusted so as not to protrude outward from the end surface 17.
[0030]
Then, as shown in FIG. 1E, a transfer paint is applied to both surfaces of the occlusal interface between the crown occlusal part molding mold 10 and the model tooth 20 corresponding to the crown occlusal part molding mold 10. The occlusal paper 21 is interposed, and the crown occlusal portion molding mold 10 and the model teeth 20 are engaged and rubbed together, thereby coloring the unoccluded portion 22 as shown in FIG. That is, the occlusal defective part is specified.
[0031]
Next, the coloring portion 22 which is a poor biting portion of the dental crown occlusal portion molding material 10 is touched or pressed by the heating iron 23 to deform the soft wax layer 14 ′, and the occlusion specified by the coloring portion 22. The local part of the cover part 12 which is a defective part is thermally deformed, and corrected to the occlusal shape 11 suitable for actual occlusion.
[0032]
The waxes 14 and 15 are easily melted by heat. In particular, the soft wax 14 is rich in plasticity with this heat melting property, that is, has a softness that easily deforms under pressure. Preferably, soft wax 14 having normal viscosity is used.
[0033]
The soft wax layer 14 ′ is plastically deformed following the thermal deformation of the cover 12 by touching or pressing with the heating iron 23, and / or melted by heating with the heating iron 23 and deformed with fluidity.
[0034]
Next, as shown in FIG. 1G, the crown molding composite mold 16 comprising the crown occlusal molding part 10 and the wax mold part 15 'is removed from the model base 1 and the sprue 5 is crowned. It attaches to the mold material 10 for occlusion part shaping | molding.
[0035]
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 molten metal 9 such as gold or silver is injected through the sprue 5, The crown mold composite mold material 16 is incinerated with the molten metal 9 to replace the molten metal 9.
[0036]
Therefore, the metal crown 7 is completed as shown in FIG. As shown in FIG. C, the metal crown 7 is covered with a base 8 in the oral cavity and firmly attached with an adhesive.
[0037]
【The invention's effect】
According to the method for manufacturing a metal crown according to the present invention, the thermoplasticity of the mold for molding a crown occlusal portion made of a thermoplastic film and the soft wax while giving the basic occlusion shape by the mold for molding the crown occlusal portion The plasticity or heat-melting property cooperates so that the occlusal shape can be easily corrected with a heating iron, and the burden on the treatment site is reduced.
[0038]
Emmasoft has moderate rigidity and elasticity, has a shape retention effect, and is suitable as a mold material for forming a crown occlusion portion to be crowned on the model base.
[0039]
The mold material for molding a dental crown occlusion part in which soft wax is encapsulated can maintain the quality characteristics of soft wax and contribute to optimization of the amount of soft wax and optimization of the thickness of the soft wax layer.
[Brief description of the drawings]
1A to 1G are cross-sectional views illustrating a metal crown manufacturing method in order.
FIGS. 2A to 2C are cross-sectional views illustrating the manufacturing method following A to G in FIG. 1 in order.
FIG. 3 is a cross-sectional view showing another example of a mold material for molding a crown occlusion portion used in a metal crown manufacturing method.
FIGS. 4A and 4B are cross-sectional views sequentially illustrating a method for manufacturing a mold material for forming a crown occlusion portion used in the metal crown manufacturing method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Model base 4 Margin part 5 Sprue 6 Casting die 7 Metal crown 8 Base 9 Molten metal 10 Mold material 10 'for a crown occlusion part Molding shape 12 Covering part 12 Cover part 13 Fitting part 14 Soft wax 14' Soft Wax layer 15 Wax 15 'Wax mold part 16 Composite mold material 17 for forming crowns Lower end face 18 of fitting part Female 19 Male 20 Model tooth 21 Occlusal paper 22 Colored part 23 for identifying occlusal defect part Heating iron 24 Protective film

Claims (2)

A model base is made from the base formed on the tooth root in the oral cavity, and on the other hand , a cover part having an occlusal shape covering the top surface of the model base and the peripheral part of the cover part are lowered and fitted to the top peripheral surface of the model base A crown occlusion part molding mold material having a shallow crown shape in which the cover part and the fitting part are integrally formed of a thermoplastic film and having a shallow crown shape is prepared. soft wax between the top surface of the model base covered by said cover portion and said cover portion for the part mold material having an occlusal shape of the same type material bear the through soft wax having a normal viscosity to the model base A soft wax layer is formed between the fitting portion and the peripheral surface immediately below the top surface of the base, and the soft wax layer is thermally deformed by a heating iron at the local portion of the cover portion having the occlusal shape. The occlusal shape is modified by deforming Further forming the dental crown occlusal portion a model base outer peripheral surface which is not the crown with mold material coated with a hard wax above the coronal occlusion portion forming mold material integrated wax mold portion, the crown occlusal portion A method for producing a metal crown, comprising: replacing a composite mold material for forming a crown comprising a mold material and a wax mold part with a metal material. Prepare the crown occlusion part molding mold material in which the soft wax is embedded in advance and the opening surface is sealed with a protective film, and peel off the protective film from the crown occlusion part molding mold material. The method for producing a metal crown according to claim 1, wherein the soft wax layer is formed by covering with a metal.

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