JPH11178840A - Crown molding matrix and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crown-molding matrix which enables veneer to be directly packed into a crown and hardened by use of a photo-setting type resin, while providing very good reproducibility for the original shape of the crown, and to provide a method for manufacturing the same. SOLUTION: A crown-molding matrix 8 has a molding surface formed in its recessed surface 8a to imitate the original shape of a crown and is fabricated by processes (A)-(D): (A) a mold for the surface configuration of the crown is made by pressure contacting a molding material into contact with the original shape of the crown; (B) a crown model is fabricated using the mold of the crown; (C) manicure is applied to the surface of the crown model as necessary, and then a plate made from a light-transmitting material is pressure contacted with the surface so that a mold for the surface of the crown model is made on the pressure-contact surface; (D) a part including the molding surface of the mold is cut out of the plate and is shaped to complete a matrix. In (C), the plate is preferably pressure contacted by vacuum suction molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crown molding matrix suitable for use in veneer formation such as restoration of a crown and improvement of color tone, and a method for producing the matrix.

[0002]

2. Description of the Related Art Conventionally, as a crown molding matrix manufactured according to individual teeth, there is known a matrix in which a recess formed by cutting the surface of a crown is filled with a natural hardening type resin. I have. This type of matrix is formed by pressing a clay-like molding material directly onto the surface of the crown. The shape of the matrix is designed with a sufficient wall thickness so that the resin can be easily kept stationary during curing. At the time of restoration, the resin filled in the depression on the crown surface is pressed into contact with the matrix using a matrix and left for a certain period of time. After the resin is fully cured, the matrix is removed from the crown surface.

[0003]

However, when such a conventional crown molding matrix is applied to a photocurable resin, the light is blocked by the material and thickness of the matrix at the time of pressing, and the light of the resin is reduced. Insufficient curing reaction. For this reason, when fabricating a veneer for a crown with a light-curing resin, the resin is laminated without using a matrix on the surface of the crown model prepared in advance, cured, and the surface is cut and polished. A veneer that reproduces the shape of the crown is produced by performing such processing. Then, the completed veneer is cemented to the surface of the crown with cement (indirect veneer restoration). In addition, after etching (acid treatment) the cut crown surface, the crown surface is directly filled with resin in the oral cavity and cured, and then the surface is subjected to treatment such as polishing, and the shape is adjusted and completed. (Direct veneer restoration).
That is, conventionally, it is not possible to effectively use a light-curable resin that is easier to handle than a naturally-curable resin,
Restoring the veneer of the crown was a complicated and time-consuming task.

Accordingly, the present invention has been made in view of such circumstances, and it is easy to directly fill a veneer with a veneer using a photocurable resin and to cure the veneer. An object of the present invention is to provide a matrix for crown molding and a method for producing the same, which has extremely good reproducibility of the original shape.

[0005]

A crown molding matrix according to the present invention for solving the above-mentioned problem is a mold capable of molding the surface shape of one or two or more adjacent crowns, The mold was made of a material, the cross section of the mold had a substantially uniform thickness, and the concave portion of the mold was provided with a molding surface formed in the shape of the original shape of the crown.

[0006] A method of manufacturing a crown molding matrix according to the present invention includes the following steps (A) to (D). (A) A molding material is pressed against the original shape of the crown to form a mold of the surface shape of the crown. (B) A crown model is prepared using the mold of the crown. (C) Nail polish is applied to the surface of the crown model as required, and then a plate made of a light-transmitting material is pressed against the surface, and the surface of the crown model is shaped into a pressed surface. (D) A portion including the molding surface of the mold is cut out from the plate body, and the shape is adjusted to complete the matrix. In the step (C), it is desirable that the pressing of the plate is performed by vacuum suction molding.

A dental impression material (alginate, silicon, etc.) may be used as a molding material for taking the original form of the crown. By pressing the molding material against the crown in the oral cavity and leaving it for a predetermined time, a mold of the surface of the crown can be taken. Further, the crown model can be formed using gypsum.

[0008] The crown model is preferably used by dividing it into one crown at a time. This is because the use of the divided model facilitates the press-contact of the plate in the step (C) and improves the accuracy of the mold. In addition, as a method of dividing the crown model, for example, two or more adjacent tooth models can be used as one unit.

The reason for applying nail polish on the surface of the crown model is to provide a spacer for adjusting the thickness of the veneer filling the surface of the crown. When the outer shape of the veneer is larger than the original shape of the crown, nail polish is applied in a required thickness corresponding to the difference in the outer shape. In the case where the crown surface is subjected to processing such as cutting or etching, if the size of the veneer becomes the same as the original shape of the crown, the application of the nail polish can be omitted.

The light-transmitting material may be any material that transmits light sufficient to cure the photo-curable resin. Specifically, acrylic and polycarbonate can be used.

The reason why the light-transmitting material is used in the form of a plate is that the matrix can be easily formed with a uniform cross-sectional thickness. When the matrix has a substantially uniform thickness, unevenness in light irradiation is reduced and veneer strength is improved.

The thickness of the plate is determined by the type of the light transmitting material,
It can be freely selected according to the strength and the like. As a selection criterion, the thickness of the matrix
It should be about 0.5 mm. If it is smaller than 0.3 mm, the strength becomes insufficient, and if it is larger than 0.5 mm,
This is because the operability is poor and the light transmittance is insufficient.

The reason why the plate is pressed by vacuum suction molding is to press the plate against a model with a uniform force to improve the accuracy of the mold. The pressure contact of the plate-like body can be performed by press molding instead of vacuum suction molding.

The size of the matrix can be adjusted according to the restoration range of the crown. Usually, a veneer covering the entire lip surface of the crown is often produced, so that the size may be substantially the same as the lip surface of the crown model.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. The crown molding matrix of the present invention,
The molding surface differs depending on the tooth to be restored. Therefore, a unique mold is created for each crown. In the examples, a matrix was prepared according to the following procedure.

First, a molding material is pressed against the lip surface of the crown in the oral cavity to take a prototype of the crown. Leave for 1-2 minutes until the molding material hardens. Next, plaster is filled in the original mold of the crown, and the crown model 1 is manufactured. The plaster used was hard gypsum for dental treatment. As shown in FIG. 1 (B), after cutting the crown model 1 at the boundary of each crown, as shown in FIG. 1 (C), the gum portion is cut to make the boundary of the crown clear. Excision (trimming) is performed to obtain a divided model 2 with one crown at a time. As shown in FIG. 2 (A), the divided model 2 is set on the support pins 4 of the vacuum suction molding machine 3, and a nail varnish 6 is applied on the lips to form a spacer. Acrylic plate 5 having a thickness of 0.5 mm is formed on vacuum suction molding machine 3
The acrylic plate is sufficiently softened by an attached heater as shown in FIG. The outer peripheral portion of the acrylic body 5 is kept airtight by the frame 7. As shown in FIG. 2 (C), the space below the acrylic plate 5 is evacuated to a vacuum and pressed against the divided model 2 to take a lip mold. After the acrylic plate 5 is naturally cured as it is, a portion including a molding surface is cut out. The cut-out matrix is adapted to the original shape of the crown, shaped and completed.

FIG. 3 shows the completed matrix. The matrix 8 has substantially the same size as the lip surface of the crown, and the concave surface 8a is formed with a molding surface that is modeled on the original shape of the crown. The cross section of the matrix 8 had a substantially uniform thickness. Further, the matrix 8 was of a transparent color and had good light transmittance.

Next, an example of the use of the crown molding matrix will be described. In this example, the color tone of the crown was improved using glass ionomer cement. The following materials were used as veneer materials. (1) Glass ionomer cement GC Co., Ltd. Photocurable glass ionomer cement "FUJI IONOMER TYPE IILC" Powder component Ingredient Amount ―――――――――――――――――――――― Aminosilicate glass 100wt% Primary color material Trace amount B. Solution Ingredient Compounding amount ―――――――――――――――――――― Polyacrylic acid 50wt% Distilled water 33wt% HEMA (hydroxyethyl methacrylate) 17wt% Initiator Trace amount

(2) Masking material GC company zinc phosphate cement “ELITE 100” Ingredient (powder) Compounding amount ―――――――――――――――――――― Zinc oxide ( ZnO) 90 wt% Magnesium oxide (MgO) 10 wt%

(3) Hard resin SHOFU Co. Hard resin for crown (transparent color) "SOLI
DEX ”Ingredients Compounding amount ―――――――――――――――――――――― Urethane resin 20wt% Filler 80wt% Additives and initiators Trace amounts Special structure inorganic filler, special structure organic filler and ultrafine particle filler are included.

The treatment method for improving the color tone is described below. 30 mg of a masking material is mixed with 60 mg of a liquid B of a glass ionomer cement, and then 80 mg of a powder A of a glass ionomer cement is added to the mixture.
And knead. As shown in FIG. 4A, the above cement mixture is uniformly applied to the lip surface (outer surface) of the crown 10 using a brush. Next, light is irradiated for 30 seconds to cure the cement mixture and form the base layer 11. A bonding agent (“Scotch Bond 2” manufactured by 3M) is applied to the surface of the base layer 11 formed as described above.
Light irradiation for 0 seconds. Modifier (SHOFU “SOLIDEX”
Adjust the color tone using "dentin stain"). As shown in FIG. 4C, a predetermined amount of the hard resin R is applied to the inner surface of the matrix 8 prepared in advance, uniformly spread, and pressed against the lip surface of the crown 10. Next, by irradiating light for 40 seconds, the hard resin R is cured, and the coating layer 12 is formed. During irradiation with light, the matrix 8 is kept in a pressed state by being gripped with tweezers or the like. The matrix 8 is removed from the crown 10 and polished as necessary to remove burrs and the like, thereby completing the operation. After the treatment, the base layer 11 and the covering layer 12
Veneers improved to natural glossy white shaded teeth.

By using the matrix 8 in this manner, it becomes easy to prepare a veneer made of a photocurable resin on the surface of the crown. Since the light transmittance of the matrix 8 is extremely good, the irradiation time of the light can be short, and a rapid treatment can be performed.

The produced veneers exhibited good durability as a result of sufficient photocuring reaction. In addition, since the veneer was thin and uniform by the pressing of the matrix 8, a good feeling of wearing was recognized.

[0024]

As explained above, the crown molding matrix of the present invention has the following excellent effects. (a) Since the photocurable resin can be easily cured on the surface of the crown, the operability when forming veneers directly on the crown surface is greatly improved. (b) Since the thickness of the veneer can be molded uniformly and thinly, the shape of the crown surface can be faithfully reproduced. (c) When finishing veneers, the parts that need to be polished are reduced and the working time can be shortened. In particular, it is not necessary to polish the press contact surface at all, and an extremely glossy surface can be obtained.

Further, according to the method for producing a crown molding matrix of the present invention, the crown molding matrix can be efficiently produced with high accuracy by a relatively simple operation.

[Brief description of the drawings]

FIG. 1 shows a crown model according to an embodiment of the present invention.
(A) is a state before division, (B) is a state after division, (C)
FIG. 4 is a diagram showing a state in which the edge of the divided model is trimmed.

FIG. 2 is a process diagram illustrating a method of vacuum-suction molding a crown molding matrix according to an embodiment of the present invention.

3A and 3B show a crown molding matrix according to an embodiment of the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a cross-sectional view taken along line AA.

FIG. 4 is a process diagram illustrating a method of using a crown molding matrix according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crown model 2 Division model 3 Vacuum suction molding machine 4 Support pin 5 Acrylic plate 6 Manicure 7 Frame 8 Matrix 10 Crown 11 Base layer 12 Coating layer R Hard resin

Claims (3)

[Claims] 1. A mold capable of molding the surface shape of one or two or more adjacent crowns, comprising a light-transmitting material, wherein the mold has a substantially uniform cross-section, and A matrix for crown molding, wherein a molding surface is formed in the concave portion of the mold to model the original shape of the crown. 2. A method of manufacturing a crown molding matrix, comprising the following steps (A) to (D). (A) A mold having the surface shape of the crown is obtained by pressing the molding material against the original shape of the crown. (B) A crown model is prepared using the mold of the crown. (C) Nail polish is applied to the surface of the crown model as required, and then a plate made of a light-transmitting material is pressed against the surface of the crown model to form a press-contact surface. (D) A portion including the molding surface of the mold is cut out from the plate body, and the shape is adjusted to complete the matrix. 3. The method according to claim 2, wherein, in the step (C), the pressing of the plate is performed by vacuum suction molding.