JPH0995408A - Relining of rebasing material for denture bed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reline a mucous face of a denture bed taking advantage of the progress of color change by using a rebase material for denture bed made of a specific material developing a color during the curing process and disappearing the color at the final cured state. SOLUTION: A rebase material for a denture base developing a color during the curing process and disappearing the color at the final cured state is used in the relining process. The rebase material preferably contains at least one kind of compound having a chromophoric group. The rebase material for the denture base is preferably composed of a liquid material produced by adding a cure accelerator and a compound having a chromophoric group to an acrylic monomer and a powdery material produced by adding a polymerization initiator to an acrylic polymer, and both materials are mixed with each other to effect a redox polymerization at normal temperature. The chromophoric group is preferably selected from sulfone group, sulfoxide group and sulfonic acid group. The cure accelerator may contain an amine. The process is suitable for the rebasing operation of an acrylic denture base and a sulfone resin denture base.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a denture base rebase material in the oral cavity by using a denture base rebase material that is colored during polymerization and disappears during final curing in the field of dental technology. Made it easier to operate the heaping timing when re-adapting.

[0002]

2. Description of the Related Art When a denture is used for a long period of time, the denture base often becomes incompatible. Therefore, the mucosal surface of the denture base is lined (rebase) to restore the conformity. In many cases, denture base rebase materials have a polymer component such as polymethylmethacrylate (hereinafter referred to as "PMMA") or polyethylmethacrylate (hereinafter referred to as "PEMA") and a monomer such as methylmethacrylate (hereinafter referred to as "MMA"). A two-component denture base rebase material is used as a component. However, MMA, which is the main compound of the monomer component, has problems such as a strong irritating odor, strong irritation to oral mucous membranes, skin, etc., and large heat generation during polymerization. There is a limit to the use as a direct rebase material and a direct relining material which are directly restored in the oral cavity.

[0003]

In recent years, for the purpose of improving these problems, denture base rebase materials using various (meth) acrylic acid esters in place of MMA as a monomer component have been investigated. Although the odor, irritation, and heat generation were improved to some extent by these examinations, these monomers that replace MMA generally have low solubility of PMMA and PEMA, which are polymer components, and therefore the viscosity of the mixture should be appropriately adjusted. There is a new problem that it is difficult to raise the denture base and the excellent operability, which is an advantage of the two-component rebase material for denture base, is lost.

[0004]

In order to solve the above problems, the present inventors have studied a two-component denture base rebase material having excellent operability and satisfying mechanical strength. The use of materials also improves the solubility of the polymer,
Furthermore, we found a phenomenon that the color is once colored during the polymerization, the color disappears when the polymerization is completed and the curing is completed, and the desired color tone is obtained, and by utilizing the course of the color tone change, the operation of adapting the rebase material to the denture base in the oral cavity It became easy and came to complete the present invention.

The present invention relates to a method for re-adapting to a mucosal surface of a denture base using a specific denture base rebase material which is colored during curing and is decolored during final curing. Further, the present invention relates to a method for re-adapting a denture rebase material, characterized in that the denture base rebase material contains at least one compound having a chromophore. Further, the denture base rebase material is composed of a liquid material and a powder material, the liquid material acrylic monomer contains a curing accelerator, a compound having a chromophore, contains a polymerization initiator in the powder material acrylic polymer, The present invention relates to a method for re-adapting a rebase material for a denture base, which comprises mixing powder and liquid and redox polymerizing the mixture at room temperature. The present invention relates to a method for re-adapting a denture rebase material containing one or more compounds having a group selected from a sulfone group, a sulfoxide group and a sulfonic acid group as its chromophore. Furthermore, the present invention relates to a method for re-adapting the denture base rebase material containing amines as a curing accelerator.

More specifically, the present invention relates to a denture base rebase material, comprising a monomer component and a polymer component, benzoyl peroxide (hereinafter referred to as "BPO") as a polymerization initiator, amines as a curing accelerator, and a chromophore. As one or more compounds having a group selected from a sulfone group, a sulfoxide group and a sulfonic acid group, particularly preferably, a specific compound containing a sulfonic acid such as paratoluenesulfonic acid (hereinafter referred to as "PTS") and methanesulfonic acid. It is a method that can be re-adapted to the mucosal surface of the denture accurately and in a timely manner by utilizing the feature that the denture base rebase material is colored during the curing and is decolored during the final curing.

According to the present invention, when performing a dental technique using a specific denture base rebase material, a specific powder material and a liquid material are mixed at a constant ratio, and a rebase material having a constant viscosity (rice cake state) is used as a denture. In a series of operations to build up on the floor, insert into the oral cavity, perform muscle formation, trim the eccentric edge, hold it in the oral cavity and remove it after hardening, set the timing of building up the rebase material on the denture base. By paying attention to the color change of the rebase material during the polymerization (curing) process, it is possible to easily and accurately raise the rebase material onto the denture base in the oral cavity.
The present invention is adaptable to rebase operations of acrylic and sulfone denture bases.

The change in color tone, which is a feature of the present invention, is that the gingival color (pink color) is first obtained immediately after the powder material and the liquid material are mixed in the operating procedure, and then the polymerization proceeds to give an appropriate mochi state. It has a blackish tone. Therefore, it is important to properly raise the denture base at that time as a guide. Finally, when the polymerization is completed, the blackish color tone disappears and the gingiva color (pink color) matches the denture base.

As the monomer component of the liquid material used in the present invention, ethylene glycol dimethacrylate (hereinafter referred to as "1
G)), triethylene glycol dimethacrylate (hereinafter "3G"), 1,6-hexanediol dimethacrylate (hereinafter "1,6HD"), 1,
3-butanediol dimethacrylate (hereinafter "1,3B
It is possible to use one or more methacrylates selected from the group consisting of "G").

The other monomer component is not limited as long as it has low irritation and low odor. More specifically, n-dodecyl (meth) acrylate, n-tridecyl (meth) acrylate, n-octadecyl (meth) acrylate, n-hexyl (meth) acrylate, n-
Cyclohexyl (meth) acrylate, methoxydiethylene glycol (meth) acrylate, ethoxydiethylene glycol (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol diacrylate, tetraethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,3-butanediol diacrylate,
1,4-butanediol di (meth) acrylate, 1,
6-hexanediol diacrylate, neopentyl glycol di (meth) acrylate, 2,2-bis [4-
(Meth) acryloyloxyphenyl] propane, 2,
2-bis [4- (meth) acryloyloxyethoxyphenyl] propane, 2,2-bis [4- (meth) acryloyloxypolyethoxyphenyl] propane, 2,2
-Bis [4- (3-methacryloyloxy-2-hydroxypropoxy) -phenyl] propane, trimethylolpropane tri (meth) acrylate, trimethylolmethane tri (meth) acrylate, tetramethylolmethane tetra (meth) acrylate, di [ (Meth) acryloyloxyethyl] trimethylhexamethylene diurethane and the like.

The polymer component, which is one of the components of the powder material of the denture base rebase material of the present invention, can be used without any limitation as long as it is soluble in the above-mentioned monomer component. Generally, PMMA, PEM in terms of chemical stability and transparency.
A, PMMA-PEMA, MMA-isobutyl methacrylate copolymer, MMA-normal butyl methacrylate copolymer, acrylic acid-ethyl methacrylate copolymer, acrylic acid-itaconic acid copolymer, polystyrene and the like are preferably used. Among these, PMMA, PEM
It is preferred to use A, PMMA-PEMA or mixtures of these polymers with other polymers.

The molecular weight of the polymer is not particularly limited,
The weight-average molecular weight is preferably in the range of 5 to 1,000,000 in view of the mechanical strength of the obtained denture base rebase material and the solubility in the monomer components. Further, in order to improve the solubility of the polymer in the monomer component, the average particle size of the polymer is preferably 10 to 100 μm.

The mixing ratio of the monomer component (liquid material) and the polymer component (powder material) in the denture base rebase material of the present invention can be selected from a wide range. Generally, in order to maintain the improvement in the mechanical strength of the obtained rebase material, the polymer component is 0.5 to 3.0 parts by weight (g), preferably 1 to 2 with respect to 1 part by volume (ml) of the monomer component. It is preferable to select from the range of parts by weight (g).

The polymerization initiator that can be preferably used in the present invention will be described below. As a polymerization initiator for room temperature polymerization, a peroxide, which is a curing agent, is used in combination with a curing accelerator represented by amines. As the above-mentioned peroxides and amines, known compounds can be used without particular limitation. For example, as the peroxide, BPO, 2,4
-Dichlorobenzoyl peroxide, dilauroyl peroxide, etc. are mentioned. In addition, as the amines, secondary or tertiary amines having an amino group bonded to an aryl group are preferably used from the viewpoint of accelerating polymerization, and tertiary amines are preferable. Specifically, N,
Preferred examples include N-dimethylaniline, N, N-dimethyl-p-toluidine, p-tolyldiethanolamine, and the like. The degree of coloring of the present invention is promoted by the presence of these amines.

In the above-mentioned polymerization initiator, the amounts of peroxide and amines used are preferably 0.05 to 5% by weight and 0.2 to 2% by weight, respectively, based on the total amount of the monomer components.

The denture base rebase material of the present invention must contain a substance having a chromophore. As the chromophore, compounds having a sulfone group, a sulfoxide group and a sulfonic acid group are preferably used. Particularly preferred is P
It is a compound having a sulfonic acid group such as TS and methanesulfonic acid.

The amount of the compound having the above chromophore used is
The amount is preferably 50 to 2000 ppm, more preferably 100 to 1000 ppm, based on the total amount of the monomer components.

The denture base rebase material of the present invention comprises, in addition to the components described above, an inorganic filler for controlling the fluidity of the denture base rebase material and the mechanical strength obtained.
A pigment for imparting a natural gingival color and a coloring heat-resistant organic substance fiber or the like can be added.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below with reference to Examples.

[0020]

【Example】

Example 1 A liquid material was prepared by adding 700 ppm of PTS to 30% by weight of 3G and 69% by weight of 1G and 1% by weight of p-tolyldiethanolamine. A powder material was prepared by adding 1% by weight of BPO and a small amount of pigment to PMMA fine powder. When the powder material and the liquid material prepared above are mixed at a powder / liquid ratio of 1 / 0.9, the material is pink at first, but becomes blackish green as the polymerization proceeds, and becomes the thickest at the end of curing. Subsequently, the color gradually disappeared, and when the polymerization was completed, only the original pink color was obtained. As a result of measuring other physical properties, the curing time was 9
Min., Temperature rise 42 ° C., ADA standard No. 17, the flow rate by the measuring method of 17 is 55 mm, the bending strength is 820 kgf / cm ² ,
Adhesive strength to PMMA 140 kgf / cm ² (pretreatment agent applied), adhesive strength to polysulfone (hereinafter “PSF”) 100 kgf / cm ² , adhesive strength to polycarbonate (hereinafter “PC”) 150 kg
A value of f / cm ² was obtained. All were satisfactory values as a denture base rebase material.

Example 2 Methanesulfonic acid 700 instead of PTS 700 ppm
The same operation as in Example 1 was performed except that ppm was added.
As a result, the process of color change and other physical properties were the same as in Example 1, and were values that were satisfactory as a denture base rebase material.

The test methods used are described below. Pressure flow test method: For the operability of the denture base rebase material, see ADA Standard No. 17-1983 (America
n Dental Association Spec
information No. 17 for Dentu
re Base Temporary Relinin
g Resins) 4.3.4 Cosistency
According to the measuring method (hereinafter referred to as pressure flow rate), a temperature of 23
The pressure flow rate was measured in a room of ± 2 ° C. and a relative humidity of 50 ± 10%. The pressure flow rate was measured by first placing a specified amount of the monomer component in a rubber cup, then placing the specified amount of the polymer component in the rubber cup, and uniformly mixing and kneading for 30 seconds 0.5 ml of the denture base rebase material of 1 ml. Weighed using a needleless tuberculin syringe, gently extruded onto a 70 x 70 x 1 (mm) glass plate, and when 2 minutes had elapsed from the time when mixing and kneading started, 60 x 60 x 1 ( mm) glass plate (mass about 10 to 12 g) is placed thereon, and a weight (mass about 738 to 740 g) is gently placed on it, and when 7 minutes have passed from the time when mixing and kneading was started, the weight and the upper part The glass plate was removed, and the diameter of the spread sample was measured at four points, and the average value was used as the pressure flow rate. The measurement was performed three times,
The total average value was defined as the pressure flow rate. In addition, ADA standard No. The standard value of the pressure flow rate of 17 is 35 to 60 mm.

Bending strength test method: The powder material of the present invention and the liquid material were mixed and kneaded and then poured into a 2 × 2 × 25 (mm) mold and polymerized at room temperature to prepare a bending test piece. Using this test piece, a Tensilon universal tester UCT-5T [manufactured by Orientec Co., Ltd.] was used to measure the bending strength at a fulcrum distance of 20 mm and a crosshead speed of 1 mm / min.

Adhesive strength test method: PMMA, PSF and P
A molded plate of the C denture base material was used as a test piece of 10 × 15 × 5 (mm), immersed in 37 ° C. water for 60 hours, and the surface of the test piece was polished with # 180 silicon carbide paper. A cellophane tape with a hole with a diameter of 4 mm was attached to the test piece to determine the area to be adhered, and an inner diameter of 6 mm on the cellophane tape,
A 5 mm high plastic ring was fixed with paraffin wax. The mixed rebase material was filled into a plastic ring, and a metal hook was inserted and fixed before curing. 1
After 0 minutes, it was immersed in 37 ° C. water and immersed for 24 hours, then the test piece was taken out, and Tensilon universal tester UCT-5T [(Ltd.)
Made by Orientec Co., Ltd., crosshead speed 1.0
It was measured in mm / min.

[0025]

The denture base rebase material of the present invention is colored during the course of polymerization, and finally the coloring disappears. Therefore, the operator can measure the timing of raising the denture based on the coloring state and operate it. Can now be done accurately and easily. Also,
Since the specific rebase material of the present invention has a high solubility of the monomer component with respect to the polymer, the monomer component and the polymer component are uniformly mixed, exhibiting excellent operability in clinical or technical aspects, excellent mechanical strength, and low mechanical strength. It is odorless, hypoallergenic, and generates less heat during polymerization, so it repairs a poorly adapted denture base directly in the oral cavity, and does not cause direct rebase and direct relining without causing discomfort to the patient. You can do it with all your heart.

Claims (5)

[Claims] 1. A method of re-adapting to a mucosal surface of a denture base using a rebase material for a denture base that is colored during curing and is decolored during final curing. 2. The refitting method for a denture base rebase material according to claim 1, wherein at least one compound having a chromophore is contained in the components of the denture base rebase material. 3. A denture base rebase material is composed of a liquid material and a powder material, wherein a liquid material acrylic monomer contains a compound having a curing accelerator and a chromophore, and a powder material acrylic polymer contains a polymerization initiator. The method for re-adapting a denture base rebase material according to claim 1, further comprising: mixing and mixing the powdered liquid and redox polymerization at room temperature. 4. The denture base according to any one of claims 1 to 3, wherein the chromophore contains at least one compound having a group selected from a sulfone group, a sulfoxide group and a sulfonic acid group. For re-adapting rebase materials for automobiles. 5. The method for re-adapting a denture base rebase material according to claim 3, further comprising an amine as a hardening accelerator.