JP2000237213A - Wax material supporting plate for temporary fixation of artificial tooth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve stability during a usage, prevent an incineration furnace from being damaged by its incineration disposal, make the decomposition by microbe possible under a natural environment, and prevent an environmental contamination from being generated by forming a wax material supporting plate of a biodegradable plastic. SOLUTION: For example, a wax material supporting plate 2 is formed by injecting poly L-lactic acid which is a biodegradable plastic, into a molding die. As a biodegradable plastic other than this, poly-lactic acid/polyglycolide, polycaprolactone, polybutylene succinate, or the like, can be used. Also, they may be used as a single body, or as a mixed body, and a coloring agent, a polymerization inhibiting material, an oxidation stabilizer, an oxidation inhibitor, a decomposition accelerator, a stabilizer, an anti-static agent, an interfacial active agent, an ultraviolet absorbing agent, or the like, may be added when required. By this constitution, the biodegradable supporting plate 2 which can be used under a normal indoor light or so without trouble, can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing material support plate for temporarily fixing artificial teeth used for a holding plate for artificial teeth. More specifically, the present invention relates to a brazing material support plate for mounting a brazing material for temporarily fixing an artificial tooth used for an artificial tooth holding plate for holding an artificial tooth such as an anterior tooth portion, a molar tooth portion and the like. .

[0002]

2. Description of the Related Art When a complete denture or a partial denture is manufactured, it is formed on a brazing material support plate for temporarily fixing artificial teeth in order to determine the arrangement state of necessary artificial teeth, the occlusal state in the oral cavity, and the like. An artificial tooth holding plate is used in which an adhesive wax material is attached to a soldering material mounting portion and artificial teeth for anterior teeth, posterior teeth, etc. are temporarily fixed using the adhesiveness of the wax material. . Various shapes of the brazing filler metal supporting plate for the artificial tooth temporary fixing used for the artificial tooth holding plate have been developed according to the front teeth portion, the molar teeth portion and the like to be temporarily fixed.

For example, the brazing material support plate (2) of the artificial tooth holding plate (1) shown in FIG. 1 is a flat plate having a concave portion (2a) formed on the upper surface. A wax material (3) is mounted in the concave portion (2a) so as to protrude from the horizontal reference plane (2b) of the brazing material support plate by a predetermined height, and an artificial tooth (4) is attached to the wax material (3). Are temporarily fixed in the same order as.

[0004] The brazing material support plate (6) of the artificial tooth holding plate (5) shown in FIG.
It has a curved convex portion directed upward, and a concave portion (6a) along the curved shape of the curved convex portion is formed on the upper surface thereof. Then, the brazing material (7) is attached to the concave portion (6a), and the artificial teeth (8) having six front teeth are temporarily fixed to the brazing material (7) in the same arrangement order as the natural teeth.

[0005] Further, the artificial tooth holding plate (1) shown in FIG.
0) The brazing material support plate (11) is for molars,
An inclined portion (11b) inclined with respect to a horizontal plane (11a) of the brazing material support plate (11) is formed. Then, the brazing material (12) is attached to the inclined portion (11b), and the artificial teeth (13) for the premolar part and the molar part are temporarily fixed to the brazing material (12), respectively.

[0006] These brazing material support plates include polyethylene,
BACKGROUND ART Thermoplastic synthetic resins such as polypropylene and polystyrene are generally used from the viewpoints of being inexpensive, lightweight, easy to mold and handle, and having physical and chemical properties that are stable. By the way, such a brazing material support plate using a thermoplastic synthetic resin is incinerated or landfilled as garbage after use. In the case of combustion treatment, the high calorie burned causes damage to the incinerator. In the case of landfill treatment, since it is hardly decomposable, it remains in the soil as it is, thereby shortening the life of the landfill site. Also, if left in the natural environment, the environment will be polluted. As described above, there is a problem that the load on the environment is large in the case of the wax support plate made of a thermoplastic synthetic resin such as polyethylene, polypropylene, and polystyrene. Recycling of used synthetic resin is being studied, but there is a difficulty in establishing good countermeasures from the viewpoint of separation, collection cost, and the like.

[0007]

SUMMARY OF THE INVENTION The present invention has been made as a result of earnest research in view of the above-described circumstances.
Stable during use, low in heat of combustion when incinerated after use, and low in risk of damaging incinerators.Decomposed into water and carbon dioxide by microorganisms when landfilled or left in the natural environment. It is another object of the present invention to provide a brazing material support plate for temporarily fixing artificial teeth which does not pollute the environment.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a brazing material support plate on which a mounting portion for an artificial tooth temporary fixing brazing material is formed, wherein the brazing material supporting plate is biodegradable. It is characterized by being made of plastic.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As biodegradable plastics,
Molding by injection molding, etc. is possible, as long as it does not deteriorate during use and functions as a brazing material support plate. Degradable plastics and biodegradable plastics based on natural products can be used.

[0010] Examples of biodegradable plastics for microbial production include copolymers of 3-hydroxybutyric acid and 3-hydroxyvaleric acid (P (3HB-3HV)) produced by Alcaligenes eutrophus and the like;
β-hydroxybutyric acid, Aureobasidium p
Pullulan, Ace produced by Ullulans
Cellulose produced by tobacter xylinum is exemplified.

Examples of the biosynthetic plastics of the chemical synthesis system include poly-L-lactic acid (PLLA), polylactic acid / polyglycolide, polycaprolactone, polybutylene succinate, polybutylene succinate / adipate, and polyvinyl alcohol.

Examples of biodegradable plastics utilizing natural products include cellulose acetate, modified starch and chitosan.

These biodegradable plastics may be used alone or as a mixture of a plurality of biodegradable plastics. Examples of the mixture of a plurality of biodegradable plastics include a mixture of P (3HB-3HV) and polycaprolactone, a mixture of polylactic acid and polycaprolactone, and a mixture of starch and polyvinyl alcohol.

For biodegradable plastics, if necessary,
Colorants, polymerization inhibitors, oxidation stabilizers, antioxidants, decomposition accelerators, stabilizers, antistatic agents, surfactants, ultraviolet absorbers, pigments, dyes, and the like can be added as appropriate. Also,
Metal salts such as calcium carbonate, magnesium carbonate, calcium sulfate, calcium sulfite, barium sulfate and magnesium sulfate, silicic acid or silicates such as kaolin and talc, and aluminum compounds such as titanium oxide and zinc oxide for the purpose of improving strength May be added.

Among the biodegradable plastics, P (3HB
-3HV) or PLLA, of which P
LLA is preferred. P (3HB-3HV) has a melting point of 1
At 36 to 162 ° C., molding can be performed using an existing injection mold because the MFI and the like are between polyethylene and polypropylene. The biodegradability is good, and the amount of heat generated by combustion is 5,700.
cal / g is about 1/2 of 11,000 cal / g of polyethylene or 11,000 cal / g of polypropylene.
And as good as cellulose. PLLA has a melting point of about 175 ° C., which is higher than that of polypropylene, a pyrolysis temperature of about 230 ° C., shows a glass transition point of about 58 ° C., which is higher than room temperature, MI of 20 to 40, and Injection molding and blow molding can be used for molding. In addition, coloring is easy because of high transparency,
It has high overall physical properties such as safety. The biodegradability is good, and the amount of heat generated by combustion is 4,560 cal / g, which is 11,000 of polyethylene.
cal / g or 11,000 cal / g of polypropylene
Is about 1/3 of that of cellulose, which is comparable to cellulose.

[0016]

The present invention will be described below in more detail with reference to examples. Of course, the present invention is not limited by the following embodiments. (Example 1) PLLA was injected into a molding die, and a resin plate having a thickness of 3 mm was molded at a molding temperature of 230 ° C. and a molding time of 10 seconds. Was measured as follows. The sample size is 3 ×
It was 15 × 90 mm. Using a compression tensile tester (Autograph AGS-500D manufactured by Shimadzu Corporation), the CHS (cross head speed) of the sample stored for one month in a thermostat at 60 ° C. and the sample exposed to sunlight in the open air for one month in summer. ) = 10 mm / min, distance between supporting points under test =
The test was carried out at 50 mm, and the bending strength was determined. The results are as shown in Table 1.

(Example 2) P (3HB-3HV) was injected into a molding die, a resin plate having a thickness of 3 mm was molded at a molding temperature of 220 ° C. and a molding time of 10 seconds, and the change in bending strength with time was carried out. The measurement was performed in the same manner as in Example 1. The results are as shown in Table 1.

(Comparative Example) Polystyrene was injected into a molding die, a molding temperature of 235 ° C., a molding time of 10 seconds and a thickness of 3 mm.
Was molded, and the change over time in bending strength was measured in the same manner as in Example 1. The results are as shown in Table 1.

Both PLLA, P (3HB-3HV) and polystyrene were stable with little change over time under a temperature condition of 60 ° C. and under sunlight exposure conditions. Although the bending strength of P (3HB-3HV) is lower than those of the other two, the strength required for the brazing material support plate is maintained. Therefore, there is no problem in using the PLLA, P (3HB-3HV) brazing material support plate under the condition of about room temperature, or in the use of ordinary room light. Other biodegradable plastics are also satisfactory as a brazing material support plate.

[0020]

[Table 1]

[0021]

The brazing material support plate for temporarily fixing an artificial tooth according to the present invention is constructed as described in detail above, so that it is stable during use and burns when incinerated after use. Water and carbon dioxide, it is safe without generating toxic gas, and the amount of heat generated by incineration is the same as that of polyethylene, polypropylene, polystyrene, etc. Since it is lower than the plastic synthetic resin, there is little risk of damaging the incinerator. In addition, when landfilled, microorganisms in the soil decompose it into harmless substances such as water and carbon dioxide and reduce their volume.Therefore, they are left in the natural environment without reducing the disposal capacity of the landfill site. It does not pollute the environment. Depending on the place of use, it can be used as fertilizer for plants and the like.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of a brazing material support plate.

FIG. 2 is an exploded perspective view showing another example of the brazing material support plate.

FIG. 3 is an exploded perspective view showing still another example of the brazing material support plate.

[Explanation of symbols]

 1, 5, 10 artificial tooth holding plate 2, 6, 11 brazing material support plate 3, 7, 12 wax material 4, 8, 13 artificial tooth

Claims (3)

[Claims] 1. A brazing material support plate on which a mounting portion for an artificial tooth temporary fixing brazing material is formed, wherein the brazing material support plate is made of biodegradable plastic. Board. 2. The brazing material support plate according to claim 1, wherein the biodegradable plastic is a copolymer of 3-hydroxybutyric acid and 3-hydroxyvaleric acid. 3. The brazing material support plate according to claim 1, wherein the biodegradable plastic is poly L-lactic acid.