JPH0597625A - Material for resinous tooth crown - Google Patents

Abstract

PURPOSE:To provide a material for resinous tooth crowns to restore the aesthetic nature and functionality of damaged tooth crowns of patients requesting repair with tooth crown. CONSTITUTION:A fiber-reinforced resin prepared by incorporating e.g. an acrylic resin with reinforcing fibers (pref. glass fibers as colorless or white fibers) is formed to ring shape in an uncured or semicured state. In case the material viscosity is too low, 10-60wt.% of a thickening agent such as aerosil or quartz powder is added; when the curing process is thermal polymerization, a small amount of a peroxide is added; for photopolymerization, a small amount of a combination of a photosensitizer with a reducing agent is added. The above- mentioned ring-shaped material is engaged with a abutment tooth model and the objective resinous tooth crown can be obtained by such a highly simple operation as to make a press contact with a finger, substantially improving operating efficiency and reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material for producing a resin crown which restores aesthetics and functionality to a patient in need of crown restoration.

[0002]

2. Description of the Related Art Porcelain ceramics or hard resins, which are excellent in aesthetics, are used as the front crown material. However, since they do not reach the necessary strength when mounted alone, it is common to build them on a metal frame or the like obtained by metal casting and use them. This method requires a very complicated process of performing metal casting, which is a very troublesome work, and further applying opaque to shield the metal color that adversely affects aesthetics, and then building up the crown material. ..

Japanese Laid-Open Patent Publication No. 2-84952 discloses a technique of using a fiber reinforced plastic in place of a metal frame in order to improve the above problems. But,
The method described in the publication is a method in which a material for a fiber reinforced plastic frame is simply processed into a sheet shape and pressed against an abutment tooth model, and an uncured sheet shape is applied to an abutment tooth coated with a release agent. When the fiber reinforced plastic material is pressure-welded, the material does not stick to the abutment tooth model, but rather adheres to a finger or a shape adjusting jig, which requires advanced technology and a lot of time.

[0004]

The present invention relates to a form of a material for a fiber reinforced resin frame used for producing a hard resin crown having excellent aesthetics. That is, the present invention is characterized in that the uncured or semi-cured material for the fiber-reinforced resin frame is formed into an annular shape. Here, the term “annular” means not only a shape having a circular cross section, but also a hollow shape such as a circular shape, an elliptical shape, a rectangular shape, or a shape similar to an abutment tooth.

The material for the fiber reinforced resin frame of the present invention is used in the following procedure. First, a material having a size suitable for the abutment tooth model is selected and fitted into the abutment tooth model coated with a release agent. Then, the material is matched with the shape of the abutment tooth by pressing with a finger through a resin film or the like. At this time, if the margin portion of the abutment tooth is largely undulating, it is cut off with scissors or the like before the pressure welding, and the pressure welding is performed after the material shape is approximately matched with the shape of the margin portion. After the press contact, the fiber reinforced resin frame is manufactured by curing by heat polymerization or photopolymerization. When pressing the fiber reinforced resin frame material onto the abutment tooth model, with the conventional technology, it is a very difficult work to adjust the form while sticking the sheet-shaped material along the shape of the abutment tooth model. Whereas it was necessary, the use of the material of the present invention resulted in a very simple work of fitting the material to the abutment model and pressing it with a finger, which greatly improved work efficiency and reliability. It

Examples of the resin used in the material of the present invention include acrylic acid esters and methacrylic acid esters, which are known as compositions for hard dental resins. Specifically, methyl methacrylate, ethyl methacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, 2,2-bis [4- (2-hydroxy-3-methacryloxypropoxy) phenyl] propane, etc. Can be illustrated.

From the viewpoint of aesthetics, colorless or white fibers are preferable as the reinforcing fibers, and specifically glass fibers are preferable. If the viscosity of the material is too low and it is difficult to give a cyclic form, use a thickener such as Aerosil or quartz powder in an amount of 10 to 60.
Add weight% to thicken to a viscosity that can maintain a cyclic form. When the curing method is heat polymerization, a small amount of peroxide is added, and when the curing method is photopolymerization, a small amount of a combination of a photosensitizer and a reducing agent is added.

[0008]

EXAMPLES The present invention will be described in detail below with reference to examples. Example 2,2-bis [4- (2-hydroxy-3-methacryloxypropoxy) phenyl] propane 14.5 parts, di (methacryloxy) trimethylhexamethylene diurethane 14.5 parts, triethylene glycol dimethacrylate 1 part , Glass fiber roving 35 parts, quartz powder 3
A composition obtained by adding a small amount of camphorquinone and dimethylaminoethyl methacrylate to 5 parts was molded into a cylindrical shape having an inner diameter of 5 mm, a thickness of 0.5 mm and a length of 6 mm, and fitted into an abutment tooth model (500A manufactured by Nissin). I put it on and pressed it with my finger. After irradiating for 90 seconds with a visible light irradiator (Kulzer Denta color xs) and curing, the frame shape is adjusted with a round bar, and a hard dental crown resin (Kulzer Denta color) is used without using an opaque material. It was built and cured according to the manufacturer's instructions. As a result, it was possible to manufacture a hard resin crown having a natural appearance in both the surface color and the transmitted color and excellent aesthetics. Resin cement (Panavia EX manufactured by Kuraray Co., Ltd.) was filled inside the hard resin crown, and it was restored to the abutment tooth model and crimped, but no abnormality such as deformation or breakage of the hard resin crown was found and it was good. there were.

[0009]

By using the resin crown material of the present invention,
A resin crown can be manufactured by a very simple work of fitting an annular material to an abutment tooth model and pressing it with a finger, and work efficiency and reliability are greatly improved.

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display area B29K 105: 12 B29L 31:48 4F

Claims (1)

[Claims] 1. A resin crown material obtained by annularly molding an uncured or semi-cured fiber-reinforced resin.