JP2002153492A - Method of making resin veneer crown coated with porcelain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of making a veneer crown which has a hardly staining surface, has excellent wear resistance and can be easily fabricated. SOLUTION: A composite resin 2 for veneering, such as an opaque resin or body resin, is built on a cast crown 1 formed of a dental alloy and a translucent porcelain piece 3 of about 0.5 mm in thickness is joined at ordinary temperature to the surface of the composite resin for veneering by utilizing the adhesiveness of the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a front crown used for dental treatment.

[0002]

2. Description of the Related Art If teeth are covered with metal, their appearance will deteriorate,
The front crown is a metal crown decorated with resin or porcelain to resemble natural teeth. The conventional method of manufacturing the forehead is
A composite resin resin crown 2 is formed on the cast crown 1 to form a veneering composite resin, and is polymerized at room temperature. A porcelain material is formed on the cast crown 1 and baked at a high temperature. They are roughly divided into types.

[0003]

[0005] Resin veneering crowns have the disadvantages that, compared to porcelain baked and cast crowns and natural teeth, the veneering surface is more liable to be worn by chewing or brushing, tends to lose luster, and tends to become dirty. is there. On the other hand, porcelain baked cast crowns retain their appearance close to natural teeth for a relatively long period of time, but compared to resin-coated crowns, cannot be manufactured without heating, require skill in manufacturing, and can be used as a type of dental alloy. There is a disadvantage that there is little.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to take advantage of the characteristics of both a resin-fronted crown and a porcelain-baked cast crown. According to the manufacturing method, a composite resin 2 for front covering is formed on the cast crown 1. Thereafter, a translucent and thin porcelain piece 3 is formed, and this single piece of porcelain 3 is joined to the previously mounted composite resin 2 for wrapping, utilizing the adhesiveness of the resin.

[0005]

Embodiments of the present invention will be described. At the stage when the cast crown 1 was made using a dental gold-silver-palladium alloy and the veneering composite resin 2 was built, the laminate veneer making program of the dental computer-aided design / manufacturing apparatus was used to remove the thickness from the porcelain block. A porcelain piece 3 of about 0.5 mm is automatically cut.

An adhesive is used for joining the casting crown 1 and the front composite resin 2 and for joining the porcelain piece 3 and the front composite resin 2.

[0007] In order to suppress the breakage of the porcelain piece 3 mounted in front,
It is preferable to strongly bond the composite resin 2 for garment and the piece 3 of porcelain.

By forming the porcelain pieces 3 thinly and further using several colors of the composite resin 2 for the veneering such as opaque resin and body resin, a complex color tone having a transparent feeling like natural teeth is reproduced. You.

By polishing the surface of the joined piece 3 of porcelain, a gloss similar to natural teeth can be obtained, and the porcelain piece 3 is hardly stained.

Conventionally, there has been no method for strongly bonding porcelain and resin, or metal and resin, and it has been difficult to join the cast crown and porcelain at room temperature. However, a safe adhesive monomer that can be bonded to porcelain and dental alloys, can be polymerized, and can be used in the oral cavity has been synthesized, and primers and adhesives containing this adhesive monomer have been developed. With the development and the development of the method for treating the surface of each of the alloy and the porcelain, durable adhesion can be obtained, and the present invention has become possible.

[0011] Experimentally, a test piece obtained by bonding a dental immediate-curing resin containing no adhesive monomer to a polished porcelain or a polished alloy is subjected to a heat cycle endurance test of tens of thousands of times. On the other hand, when the resin is bonded to a substrate that has been subjected to sandblasting or primer treatment, the adhesive strength is relatively high, and the adhesive strength is relatively high. It has been confirmed that there is no statistically significant difference in the adhesive strength obtained before and after the durability test.

[0012]

According to the present invention, since the adhesiveness of the resin is used for joining the porcelain and the dental alloy, the porcelain can be foreheaded without heating. Therefore, a heating device is not required, the time required for production is shorter than that of a porcelain baked cast crown, no skill is required, and all kinds of dental alloys can be used. Furthermore, the veneered crown produced according to the present invention, as in the case of porcelain baked cast crowns, is less likely to wear on the foreground surface, lose gloss, and become dirty as compared to resin veneered crowns. Hateful. Thus, the appearance resembles natural teeth and is pleasing to treated patients.

[Brief description of the drawings]

FIG. 1 is a front view of a front crown according to the present invention.

FIG. 2 is a sectional view taken along line a of FIG.

FIG. 3 is a top view of the forehead of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cast crown 2 Veneering composite resin 3 Porcelain pieces

Claims (1)

[Claims] 1. A method of manufacturing a crown, wherein a molded piece of porcelain is joined to a surface on which a composite resin for a crown is built on a crown formed of a dental alloy.