JPH0568687A - Hard resin faced prosthetic appliance reproducing natural color of dental crown and formation thereof - Google Patents

Abstract

PURPOSE:To reproduce the natural color tones and transparent feel possessed by the natural teeth by building up an acrylic resin having high transparency increasingly thickly from the central part of the dental crown to the cutting edge part and its adjacent part to form a lower layer and coating the surface of this layer thinly with a dentin color acrylic resin over the entire surface of the dental crown to form an upper layer. CONSTITUTION:An adhesive is applied on the build-up surface of the dental crown 1 and an operator 9 which shields this metallic color and forms the substrate of the dental crown color is selected to meet the target color tones of the dental crown and is applied on the resin build-up surface of the dental crown. The resin is then polymerized. The transparent resin or the resin 2 having the high transparency is built up on the cutting edge part and its adjacent part increasingly thickly from the central part of the dental crown toward the cutting edge side. The color tones or dots, etc., of the patient's teeth are colored by the characteristic resin of the target dental crown and after the resin is polymerized and fixed, the dentin color and enamel color resins 4, 5 are built up on the upper layer thereof to reproduce the dental crown color. The final lamination is executed by only the dentin color resin 6. A proper amt. of the acrylic resin is stretched in the feel of pressing the resin toward the lip side surface and is built up by the procedure of shaping the form of the dental crown.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard resin front prosthesis for a crown and a method for producing the same. More specifically, it is a technique for obtaining the natural color tone and transparency of natural teeth as much as possible in a hard resin veneer crown and bridge, and efficiently and accurately reproducing the morphology. ..

[0002]

BACKGROUND OF THE INVENTION In hard resin prostheses, it is a fundamental requirement to have an aesthetic color and morphology. Above all, there is currently no established technique for obtaining a transparent feeling in harmony with natural teeth.

This is because the formation of the dentin form by the multicolor buildup (layering), which is indispensable for reproducing the natural feeling of natural teeth, has been conventionally performed on the opaque (opaque resin) coated surface of the neck of the tooth. In the construction method in which the color resin (cervical color), the dentin color resin (dentine color), and the cut edge color resin (enamel color) are sequentially built up, it is impossible to form fine materials, and the light beam of the resin This is because unevenness (incongruity) may occur in the target color tone reproduction due to the refractive index and the like. This tendency is especially observed in prostheses having a long total length.

[0004] In the case of a hard resin veneer crown, the thickness of the resin layer to be built up is to be lined with metal up to or near the tongue cut edge and to install retention beads or loops as a fixing device for the build up layer. Limited, it is necessary to use opaque opaque with a high lightness to block the color of the metal crown, and to use a resin with a highly opaque crown color (designated color) to prevent the transmission of the opaque color. Therefore, there is a drawback that the color tone becomes monotonous and flat.

[0005]

The problem to be solved is to obtain the natural color tone and transparency of natural teeth as much as possible in a hard resin front crown and bridge, and to reproduce the form efficiently and accurately. It is an object of the present invention to provide a hard resin front prosthesis and a method for making the same.

[0006]

[Means for solving the problem] A transparent color or a highly transparent resin is built up in a considerable amount in the central part of the crown, and a resin having a higher lightness than that is thinly built up in the upper layer, so that the transparent feeling of a natural crown is obtained. Further, the inventors have discovered that the three-dimensional effect can be emphasized, and have reached the present invention. The greatest feature of the present invention is that a thick and highly transparent resin is built up on the incisal part and its adjacent part from the central part of the crown toward the incisal side to form a lower layer, and a dentin color is formed over the entire surface of the crown. It is to form an upper layer by covering with resin.

If desired, a characteristic color (patient-specific tooth color) resin can be built up between the lower and upper layers.

In the dental prosthesis and method for producing the same according to the present invention, as shown in FIG. 1, since the surface of the buildup layer is built up with only the dentin-colored resin, the color tone is different from that of the conventional multicolored resin overlaying method shown in FIG. No unevenness occurs.

Next, the present invention will be described in more detail by way of examples. Since the photopolymerization method is suitable for performing the build-up method according to the present invention more simply and correctly, photopolymerization resin (THERMORESIN LC) manufactured by GC was used, but it can be used in combination with the chemical polymerization resin or the chemical polymerization resin.

[0010]

[Reference Example] After forming a wax crown before manufacturing a metal frame, a labial side negative mold is sampled with anhydrite or silicone, and used to modify the shape of a crown prosthesis described later. (1) Apply an adhesive to the build-up surface of the crown, and (2) a device for fixing the build-up layer, such as loops, retention beads, etc., and fill the thick part of the build-up layer with an appropriate amount of resin. Polymerize. This makes the built-up area constant. There is no limitation on the color of the resin used here. (3) Opaque (opaque resin) that shields the metallic color of the crown and creates a base of crown color
Is selected according to the target color tone of the crown, and is applied to the crown resin buildup surface and polymerized.

[0011]

EXAMPLE A transparent or highly transparent resin (not colorless but with a slight crown color tone) is built up after the steps of the above reference example. The build-up of this transparent resin is as shown in Fig. 3.
The thickness of the incisal part and its adjacent part is increased from the central part of the crown toward the incisal side.

The gypsum negative mold was previously put in water to absorb water sufficiently, and after wiping off excess water on the resin layer pressure contact surface, gradually confirming the position applied to the resin surface on which this negative mold was built up, gradually. By pressing, the build-up amount and build-up form are modified, and the thickness of the crown incision is reproduced by the transparent resin.
This form is thick at the incisal side and its adjacent portion and thin at the central portion of the crown and the cervical side (the cervical side may not require a buildup layer). Polymerization at this stage can ensure the morphology of this layer.

A target resin for the crown of the crown may be colored on the first built-up layer of a transparent resin or a resin having a high degree of transparency to color the tone or spots of the patient's teeth.

A characteristic color resin can be polymerized and fixed, and then a dentin color or enamel color resin can be built up on the upper layer to reproduce the crown color. The color tone is adjusted and built up according to the thickness and size of the crown, but unlike the conventional method, the amount is small. Enamel adjustment color resin is applied to the edges and corners of the incisal edge, and dentin adjustment color is one rank darker tones. It shields the opaque color of 3), creates a three-dimensional crown color, and brings out the effect of the transparent resin of the first layer. As a result, the transparency of the natural tooth and the contrast of the crown color can be obtained, and the color tone unique to the patient, which changes depending on age and sex, can be reproduced as planned.

The final lamination is performed only with the dentin resin,
Take an appropriate amount of resin out of the syringe, stretch the resin as if pressing it against the side of the lips, and build it up in a manner that can shape the crown morphology. Bubbles tend to enter when creating joints, so be careful not to tear them and cover the entire lip surface. As mentioned above, pressure welding with a plaster negative mold,
It is better to build up a little more for molding, so that a small amount will stick out by pressure welding.

[0016]

[Effects of the Invention] Natural teeth have large individual differences including individual characteristic colors. Especially, regarding transparency, it is a requirement to effectively draw it out and create a three-dimensional effect in order to manufacture an aesthetic prosthesis. .. Therefore, conventionally, multicolor buildup was a condition, and by doing multicolor buildup, the brightness of the resin was lowered,
This resulted in a strong opacity and flat color reproduction. INDUSTRIAL APPLICABILITY The present invention is a method for efficiently producing a hard resin veneer crown and bridge in which natural color tone and transparency of natural teeth are obtained as much as possible, and morphology is efficiently and accurately obtained. It is a thing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a crown of the present invention

FIG. 2 is a sectional view of a conventional dental crown.

FIG. 3 is a sectional view showing a transparent resin build-up state of the present invention.

[Explanation of symbols]

 1 Crown metal 2 Transparent resin 3 Survival color resin 4 Dentine adjustment color 5 Enamel adjustment color 6 Dentine color resin 7 Dentine color resin layer 8 Enamel color resin layer 9 Opaque resin

Claims (4)

[Claims] 1. A hard resin front prosthesis for a metal crown, wherein a transparent or highly transparent resin is thickly built up from the central portion of the crown toward the incision side to the incision side and the adjacent layer to the lower and upper layers of dentin color. A hard resin front prosthesis with a natural color reproduction of the crown consisting of an upper layer of resin that is thinly laid over the entire front prosthesis surface. 2. The hard resin front prosthesis for a dental crown according to claim 1, wherein the surface of the built-up lower layer is thinly built up with a characteristic color resin of a crown, and the upper layer is built up thereon. 3. A method for reproducing a natural color of a hard-resin front prosthesis having a metal crown, wherein a transparent or highly transparent resin is thickly built up from the central portion of the crown toward the incision side to the incision edge and its adjacent portion. And a dentin-colored resin is thinly built up on the entire surface of the front prosthesis to create a natural color reproduction of the hard resin front prosthesis. 4. The natural color reproduction method for a hard resin prosthesis according to claim 3, wherein the lower layer surface is thinly built up with a characteristic color resin of the crown, and the upper layer is built up thereon.