JP3699067B2 - Manufacturing method of crown occlusion molding material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crown occlusion part molding mold material used for molding a metal crown to be crowned on a base formed on the root of the oral cavity, in particular, a crown occlusion part molding mold material used for molding the occlusal part of a metal crown. Relates to the manufacturing method.
[0002]
[Prior art]
One of the treatments for dental caries in the oral cavity is to make a model base from the base formed on the treated root, make a metal crown from this model base, and cover this base with an adhesive on the base. This metal crown is made by the wax mold manufacturing method shown in FIGS.
[0003]
In FIGS. A and B, reference numeral 1 denotes a model base formed from a base formed on the tooth root in the oral cavity. First, as shown in FIG. A, the entire peripheral surface including the top surface and the outer peripheral surface of the model base 1 is shown. A wax coating layer 2a having a predetermined thickness is formed by coating with wax.
[0004]
Next, as shown in FIG. B, the occlusal shape 3 having a precise uneven shape is cut on the top surface of the wax coating layer 2a, the outer shape is adjusted, and the lower end of the wax coating layer 2a (contacting the gums) The margin part 4) is cut to make a wax mold 2b.
[0005]
Next, as shown in FIG. C, the wax mold material 2b is removed from the model base 1, and a sprue 5 is attached to the wax mold material 2b.
[0006]
Next, as shown in FIG. D, the wax mold material 2b 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, and the molten metal 9 causes the wax mold material 2b. Is incinerated to replace the molten metal.
[0007]
Therefore, the metal crown 7 is completed as shown in FIG. As shown in FIG. F, the metal crown 7 is put on a base 8 in the oral cavity and firmly attached with an adhesive.
[0008]
[Problems to be solved by the invention]
However, in the above conventional crown manufacturing method, a lot of skill and processing time are required for the processing operation for preparing the wax mold material 2b into a tooth shape, in particular, the cutting of the precise occlusal shape 3, and as a result, the metal crown 7 The production cost was invited. In addition, quality variations were invited.
[0009]
[Means for Solving the Problems]
The present invention provides a mold material for forming a crown occlusal portion used for manufacturing a metal crown that drastically solves the above problems, and in particular, a method for manufacturing a mold material for forming a crown occlusion portion used for forming a bite portion of a metal crown. Is to provide.
[0010]
The mold material for forming a crown occlusal portion according to the present invention includes a cover portion having an occlusal shape covering a top surface of a model base molded from a base formed on a tooth root in the oral cavity, and a fall from the peripheral edge of the cover portion. And a fitting portion fitted to the top peripheral surface of the model base. The covering portion and the fitting portion are formed of an integrally molded plastic film, and the whole has a shallow crown shape.
[0011]
The manufacturing method of the above-mentioned crown occlusal part molding mold material is a method of hot press molding a plurality of crown occlusion part molding mold materials on a single thermoplastic film, and laying the press molded film on the surface of a ruler base, Positioning projections protruding from the surface of the ruler are fitted and positioned in the base opening of each of the crown occlusion part molding molds, and are positioned from the side of the fitting part of the crown occlusion part molding mold. A method is adopted in which the cutting tool is horizontally moved along the flat top surface of the protrusion to cut the base portion of the fitting portion to obtain individual crown occlusal portion forming molds.
[0012]
The occlusal occlusal part molding material can be easily applied to the complicated occlusal shape, and the conventional occlusal orthodontic machining (cutting) required for this can be saved, greatly reducing machining time and cost. be able to. Moreover, a homogeneous metal crown can be manufactured without requiring highly skilled techniques as in the prior art.
[0013]
The crown occlusion part molding material is made of an integrally molded plastic film, and can be mass-produced at a very low cost.
[0014]
Further, the lower end surface of the fitting part of the crown occlusal part molding material can be provided with a shear surface substantially perpendicular to the peripheral surface thereof, whereby the wax for producing the crown molding compound mold material described later can be used. The bonding strength of the abutting interface with the crown occlusal part molding material can be ensured, and the work of correcting the margin part can be easily performed while making the fitting part and the outer surface of the abutting part of the wax uniform.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
[0016]
In FIG. 2A, reference numeral 10 denotes a mold material for forming a crown occlusion portion made of a plastic film. 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, and the cover portion 12 and the fitting portion 13 are formed of an integrally molded plastic film, and the whole exhibits a shallow crown shape. .
[0017]
The lower end surface 17 of the fitting portion 13 has an angle α formed with respect to the peripheral surface thereof at a substantially right angle, and the end surface is a sheared surface cut by the blade 23.
[0018]
The said crown occlusion part shaping | molding die 10 is continuously hot-pressed using the female die 18 and the male die 19 which are shown in B figure to the thermoplastic film 10 'shown to A figure of FIG. Mass production.
[0019]
As shown in FIG. C, the demolded press-molded product has a plurality of crown-occlusion portion molding molds 10 press-molded on a single film 10 '.
[0020]
As shown in FIG. D, the press-molded film 10 ′ is laid down on the surface of the ruler base 20, and positioning protrusions 21 projecting from the surface of the ruler base 20 are formed in the base opening of the crown occlusal part molding die 10. To fit. That is, the positioning is performed by fitting shallowly into the base opening surface of the fitting portion 13.
[0021]
Next, as shown in FIG. D, the blade 23 is horizontally moved along the flat top surface 22 of the positioning projection 21 from the side of the fitting portion 13 of the crown occlusal portion molding mold 10, and the fitting portion 13 is moved horizontally. Cut the base of. As a result, the lower end surface 17 of the fitting portion 13 is substantially perpendicular to the peripheral surface, and the end surface 17 is a sheared surface cut by the blade 23.
[0022]
Preferably, as shown in FIG. E, the height of the fitting portion 13 is made slightly higher than the set height, and the base portion of the fitting portion 13 is cut in the middle at the set height. That is, the base portion of the fitting portion 13 is cut at a position slightly spaced from the surface without cutting at the same level as the surface of the film 10 '.
[0023]
The crown / occlusion portion molding mold 10 having the covering portion 12 and the fitting portion 13 is formed of a transparent or translucent integrally molded plastic film.
[0024]
The mold occlusal part forming mold 10 is prepared, and on the other hand, as shown in FIG. 2B, the model base 1 is made from the base 8 formed on the root of the mouth, and only the top of the model base 1 is The crown is covered with a molding material 10 for forming a crown occlusal portion made of a plastic film having a shallow crown shape.
[0025]
When the crown is to be crowned, the crown-occlusion portion molding mold 10 is formed from a transparent or translucent plastic film, so that the crown is crowned at an appropriate position and height while being seen through.
[0026]
The crown occlusal portion molding mold 10 and the model base 1 are composed of an adhesive layer 14 such as silicon or soft wax interposed between the inner peripheral surface of the dental crown occlusal portion molding mold 10 and the top outer peripheral surface of the base 1. It adheres so that it can be peeled off through and is crowned on the same top.
[0027]
Next, as shown in FIG. C, the outer peripheral surface of the model base 1 not covered with the crown occlusal portion molding mold 10 is covered with wax 15 ′, and as shown in FIG. The margin part 4 is cut to form a wax mold part 15, and a crown molding composite mold material 16 integrated with the crown occlusion part molding mold material 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 die 10 made of a plastic film, that is, with the thick surface of the plastic film. It adheres and it coats so that it may not project outward from the lower end surface 17 of fitting part 13.
[0029]
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 molding material 10 is not crowned, and is raised by the adhesive layer 14 made of soft wax or silicon. It adjusts so that it may closely_contact | adhere to the end surface 17 of the fitting part 13 of the part molding die 10, and does not protrude outward from this end surface 17. FIG.
[0030]
As shown in FIG. E, the mold is removed from the model base 1, that is, the crown molding composite mold 16 comprising the crown occlusal part molding material 10 and the wax mold part 15 is removed from the model base 1. The sprue 5 is attached to the crown-occlusion portion molding mold 10.
[0031]
Next, as shown in FIG. F, 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. Then, the composite mold material 16 for crown forming is incinerated to replace the molten metal 9.
[0032]
Thus, the metal crown 7 is completed as shown in FIG. As shown in FIG. H, the metal crown 7 is put on a base 8 in the oral cavity and firmly attached with an adhesive.
[0033]
【The invention's effect】
According to the present invention, the shape of the occlusal portion can be easily imparted by the mold material for forming the occlusal portion of the crown, and the conventional occlusal portion correction processing (cutting) required for this can be saved, and the processing time can be greatly reduced. Reduction and cost reduction can be achieved. Moreover, a homogeneous metal crown can be manufactured without requiring highly skilled techniques as in the prior art.
[0034]
The crown occlusion part molding material is made of an integrally molded plastic film, and can be mass-produced at a very low cost.
[0035]
Further, the lower end surface of the fitting portion of the crown occlusion portion molding mold material can be provided with a shear surface substantially perpendicular to the peripheral surface thereof, whereby the wax for producing the above-mentioned crown molding composite mold material can be used. The bonding strength of the abutting interface with the crown occlusal part molding material can be ensured, and the work of correcting the margin part can be easily performed while making the fitting part and the outer surface of the abutting part of the wax uniform.
[Brief description of the drawings]
FIGS. 1A to 1F are cross-sectional views illustrating a conventional metal crown manufacturing method in order.
FIGS. 2A to 2H are cross-sectional views illustrating a metal crown manufacturing method according to the present invention in order.
FIGS. 3A to 3E 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 crown occlusal part molding Thermoplastic film 11 Occlusion shape 12 Cover part 13 Fitting part 14 Adhesive layer 15 Wax Mold part 15 ′ Wax 16 Composite mold material 17 for forming the crown 17 Lower end surface 18 of the fitting part Female mold 19 Male mold 20 Ruler base 21 Positioning protrusion 22 Head top surface 23 Cutlery

Claims (1)

A cover portion having an occlusal shape that covers the top surface of the model base molded from the base formed on the tooth root in the oral cavity, and is fitted from the peripheral edge of the cover portion to the top peripheral surface of the model base A method for manufacturing a crown occlusion part molding material having a fitting crown and a shallow crown as a whole, wherein a plurality of crown occlusion part molding molds are hot-pressed on a single thermoplastic film Forming, pressing the press-molded film on the surface of the ruler base, positioning positioning projections projecting on the surface of the ruler base into the respective base opening portions of the crown occlusal part molding material, positioning, To horizontally move the cutter along the flat top surface of the positioning projection from the side of the fitting portion of the crown occlusion molding material, and cut the base of the fitting portion to obtain individual crown occlusion molding material A manufacturing method of a mold material for forming a crown occlusal portion characterized by the above.

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