JP2007254303A - Flexible lining material for thermal polymerization type denture base and method for preparing denture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a flexible lining material have both characteristics of adhesiveness and durability. <P>SOLUTION: Polymerization is carried out simultaneously with a resin for a denture base used for the denture base so that 49.8-99.6 wt.% of a radically polymerizable urethane-based oligomer, 0.2-5 wt.% of a polymerization initiator and 0.2-5 wt.% of a polymerization inhibitor are contained to improve the adhesiveness. The resultant cured product is cross-linked and the rate of polymerization is further raised. Thereby, even the durability is improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat-curing denture base soft lining material and a denture preparation method.

  Generally, a person who has extracted a natural tooth wears a denture (artificial tooth) on that portion. The artificial tooth maintains the oral mucosa surface through the denture base. The mucous membrane that supports the dentures of the elderly, even if a denture with excellent compatibility is attached, the mucous membrane of the ridge is thinned as age increases, making it difficult to withstand occlusal pressure and easily causing pain and inflammation during occlusion . For such patients, pain and inflammation at the time of occlusion often do not heal even if compatibility is improved with a hard lining material. Therefore, a method using a soft lining material or a tissue conditioner on the denture base mucosa is used for the purpose of bearing the occlusal pressure of the denture base in as wide an area as possible and avoiding concentrated concentration. These utilization methods are performed by a method in which a part of the denture in use is polished and removed, and a new soft lining material is added to the part. Conventionally, acrylic, silicone, fluoro, olefin, and the like are commercially available as soft lining materials, but the current mainstream is acrylic and silicone (see, for example, Patent Document 1).

  On the other hand, an increasing number of patients use denture stabilizers instead of soft lining materials in order to improve the feeling of wearing. This denture stabilizer is currently sold at mass merchandisers and is advertised in commercials, etc., and using this denture stabilizer can soften the surface of the mucosal contact surface of the denture base, A good wearing feeling can be obtained.

Japanese Patent Laid-Open No. 10-245313

  However, if the use of denture stabilizers is mistaken, precision-made dentures will not function efficiently, but may cause, for example, temporomandibular disorders or become unsanitary if they are not replaced. Therefore, it is originally desirable to use a soft lining material.

  On the other hand, acrylic soft lining materials contain a large amount of plasticizer for softening, and due to their elution, the durability of the material is poor. Silicone soft lining materials use an adhesive for the denture base. Therefore, there is a problem that adhesion with an adhesive and durability thereof are poor. Therefore, at present, acrylic-based soft lining materials can only be used for about 10 days, silicone-based soft lining materials can only be used for about one month, and patients lining soft lining materials can be replaced. For this reason, he was forced to return to the hospital, which took time and money.

In view of the above-described problems, a first object of the present invention is to provide a denture base soft lining material having both adhesive properties and durability characteristics.
In addition to the above object, a second object is to provide a denture base soft lining material having a good wearing feeling.

  The heat-curing denture base soft lining material of the present invention comprises 49.8 to 99.6 wt% of a urethane oligomer capable of radical polymerization, 0.2 to 5 wt% of a polymerization initiator, and 0.2 to 5 of a polymerization inhibitor. 5 wt% is contained.

  Another feature of the heat-curing denture base soft lining material of the present invention is that two or more layers of the heat-curing denture base soft lining material described above are laminated so that their elastic moduli are different from each other. It is that you are.

  Other features of the heat-curing denture base soft lining material of the present invention are that the elastic modulus of the surface in contact with the oral mucosa surface is 0.66 to 4 MPa, and the elastic modulus of the surface in contact with the denture base is 20 ˜100 MPa.

  The denture manufacturing method of the present invention includes a step of attaching an occlusal floor and artificial teeth to a model in a patient's oral cavity, a step of burying and solidifying the model to which the occlusal floor and artificial teeth are attached, and the plaster The step of removing the occlusal floor from the buried model, and the heat-curing denture base soft back described above in a predetermined region in the portion of the oral cavity where the occlusal floor is in contact In the space created by removing the occlusal floor in a state in which the model lined with the step of lining the dressing material and the soft lining material for the heating polymerization denture base is buried in the plaster A step of pouring the resin solution, a step of removing the gypsum after the resin solution is solidified, and a step of polishing the artificial tooth, the solidified resin solution, and the denture made of the heat-curing denture base soft lining material; It is characterized by having.

  According to the present invention, 49.8 to 99.6 wt% of a urethane oligomer capable of radical polymerization, 0.2 to 5 wt% of a polymerization initiator, and 0.2 to 5 wt% of a polymerization inhibitor are included. Therefore, since it can superpose | polymerize simultaneously with the denture base resin used for a denture base, adhesiveness can be improved. Moreover, since it has bridge | crosslinked and a polymerization rate is high, it has the property stabilized for a long time, and durability can also be improved.

  According to another feature of the present invention, the elastic modulus of the surface in contact with the oral mucosa surface is 0.66 to 4 MPa, and the elastic modulus of the surface in contact with the denture base is 20 to 100 MPa. Therefore, since the surface in contact with the oral mucosa surface is soft, a good wearing feeling can be obtained.

  The present inventor found that when one uses a urethane-based oligomer in a denture base resin as one means for improving adhesiveness, the interface is sufficiently bonded, and by mixing this oligomer, We found that there is a combination that shows elasticity. Furthermore, the cured product was found to be stable for a long period of time because it is crosslinked and has a high polymerization rate. As a result of studying the above, the present invention has been completed.

  The feature of the present invention is that it contains 49.8 to 99.6 wt% of a urethane oligomer capable of radical polymerization, 0.2 to 5 wt% of a polymerization initiator, and 0.2 to 5 wt% of a polymerization inhibitor. It is.

  The urethane-based oligomer is a main substance that is responsible for chemical bonding with the hard resin used in the denture base and further determines the post-polymerization properties of this soft lining material. When the ratio is less than 49.8 wt%, the viscosity before polymerization becomes low and it is difficult to form into a sheet. On the other hand, when the ratio is larger than 99.6 wt%, the effect of other additives is lost. Accordingly, the urethane-based oligomer is desirably 49.8 to 99.6 wt%.

  The urethane oligomer used in the present invention can be radically polymerized.

  Moreover, 49.8 wt% or less of methacrylic acid ester may be contained. The methacrylic acid ester is added to adjust the elasticity of the soft lining material after polymerization, but since it affects the fluidity (viscosity) of the urethane-based oligomer before curing, 49.8 wt% is added. If exceeded, it becomes difficult to maintain the sheet state. Therefore, the methacrylic acid ester is desirably 49.8 wt% or less.

  Examples of the methacrylic acid ester used in the present invention include ethyl methacrylate and butyl methacrylate.

  Moreover, 49.8 wt% or less of a methacrylic acid ester polymer or a methacrylic acid ester copolymer may be contained. The main purpose of adding a methacrylic acid ester polymer or a methacrylic acid ester copolymer is to adjust the fluidity when formed into a sheet, but it also affects the elastic modulus after curing. Due to the powder particles, if it exceeds 49.8 wt%, the fluidity is lost. Therefore, the blending ratio of the methacrylic acid ester polymer or the methacrylic acid ester copolymer is desirably 49.8 wt% or less.

  Examples of the methacrylic acid ester polymer or methacrylic acid ester copolymer used in the present invention include polymers or copolymers such as ethyl methacrylate and butyl methacrylate.

  About 0.5 to 1.0% of a polymerization initiator is added to a general dental material accompanied by polymerization together with a polymerization inhibitor. When the polymerization initiator exceeds 5 wt%, the polymerization rate proceeds, but there is a risk of polymerization during storage. On the other hand, when the polymerization initiator is less than 0.2 wt%, the effect of the polymerization initiator cannot be obtained. Therefore, the polymerization initiator is desirably 0.2 to 5 wt%. Examples of the polymerization initiator used in the present invention include benzoyl peroxide.

  About 0.5 to 1.0% of a polymerization inhibitor is added to a general dental material accompanied by polymerization together with a polymerization initiator. If the polymerization inhibitor exceeds 5 wt%, the polymerization inhibitor functions as a plasticizer after polymerization, and thus the physical properties are lowered. On the other hand, when the polymerization inhibitor is less than 0.2 wt%, the effect of the polymerization inhibitor cannot be obtained. Therefore, the polymerization inhibitor is desirably 0.2 to 5 wt%. Examples of the polymerization inhibitor used in the present invention include hydroquinone.

  Further, the heat-curing denture base soft lining material of the present invention may be laminated in two or more layers so as to have different elastic moduli. As described above, the methacrylic acid ester, methacrylic acid ester polymer or methacrylic acid ester copolymer to be blended is for adjusting the elastic modulus. For this reason, by changing the blending ratio, it is possible to produce heat-curing denture base soft lining materials having different elastic moduli.

  Moreover, the heat-curing denture base soft lining material of the present invention has an elastic modulus of the surface in contact with the oral mucosa surface of 0.66 to 4 MPa, and an elastic modulus of the surface in contact with the denture base of 20 to 100 MPa. Is preferred. If the elastic modulus of the surface in contact with the oral mucosa surface is less than 0.66 MPa, it is difficult to form into a sheet, and if it is greater than 4 MPa, the feeling of wearing is resistant. Moreover, if the elastic modulus of the surface in contact with the denture base is less than 20 MPa, the fluidity increases and the adhesiveness and durability deteriorate, and if it exceeds 100 MPa, the large occlusal force is relaxed and the masticatory force is dispersed. Disappears.

  FIG. 1A is a cross-sectional view showing the internal structure of the upper full denture, and FIG. 1B is a view showing the internal structure of the upper partial denture. As shown in FIGS. 1A and 1B, the soft lining material 101 is lining on the outside of the denture base resin 102 to which the artificial teeth 103 are attached.

FIG. 2 is an enlarged view showing an example of a cross-sectional structure of the maxillary denture in a portion surrounded by a dotted line in FIG.
As shown in FIG. 2, the heat-curing denture base soft lining material of the present invention has a soft portion (low elastic portion) 202 on the surface side (side contacting the oral mucosa layer 201) and an inner side (denture base). The side which contacts the resin 102 for use) has a structure composed of a hard portion (high elastic portion) 203. Thereby, since the surface which contacts the oral mucosa layer 201 is soft, a favorable wearing feeling can be obtained. Moreover, since the heat polymerization type soft lining material is used, it can be polymerized simultaneously with the denture base resin 102, and adhesion can be secured.

  In addition, the denture using the heat-curing denture base soft lining material of the present invention can be manufactured by the following method. First, using a precision impression material, an intraoral impression (negative type) is collected. Then, a gypsum kneaded with water is poured into the impression material, and a work model (having the same shape as the oral cavity) 301 as shown in FIG. 3 is produced.

  Next, as shown in FIG. 4, an occlusal floor 401 serving as a base for the denture base is produced on the work model 301 using wax. When the occlusal floor 401 is produced, the plastic artificial teeth 103 are selected and arranged on the occlusal floor 401, and the surface portion of the occlusal floor 401 is shaved to form gums.

  Next, as shown in FIG. 5, the work model 301 having the occlusal floor 401 and the artificial teeth 103 is put in a metal lower flask 501, buried with the burying plaster 502, and waits until the burying plaster 502 is hardened. Then, when the embedding gypsum 502 is cured, the upper flask 601 is placed, the embedding gypsum 602 is poured into the upper flask 601 as shown in FIG. 6, and the process is waited until the embedding gypsum 602 is cured again. When the embedding gypsum 602 is cured, the upper and lower flasks 601 and 602 are divided and heated to remove the wax constituting the occlusal floor 401 (dewaxing).

  Next, the soft lining material 101 according to the present invention is cut into a necessary size along the oral mucosa surface. Then, the thickness of the lower flask 501 shown in FIG. 7 is adjusted on the gypsum model by finger pressure to obtain an appropriate thickness as shown in FIG. Next, the divided upper flask 601 is returned to the lower flask 501. Then, the denture base resin powder (polymethyl methacrylate (polymer powder)) and methyl methacrylate (monomer) are mixed, and the mixture is filled in the space 901 from which the wax shown in FIG. 9 is removed. At this time, if the denture base resin is a chemical polymerization type, the mixture is poured as it is and polymerized at room temperature, but in the case of the heat polymerization type, the mixture is filled in the part where the wax is removed after becoming mochi. Polymerize by heating. Then, after cooling to room temperature and the denture base resin is polymerized, the upper and lower flasks 501 and 601 are divided into upper and lower parts, and the denture is taken out and polished.

  As described above, the heat-curing denture base soft lining material of the present invention can be easily used in the course of the production of dentures, so there is no need to purchase new instruments and devices, which is very clinical. It is valid.

  Hereinafter, based on an Example, this invention is demonstrated in detail.

Example 1
Add 1 wt% of benzoyl peroxide (polymerization initiator) and 1 wt% of hydroquinone (polymerization inhibitor) to urethane oligomer (SH-9832: manufactured by Negami Kogyo Co., Ltd.) heated to 50 ° C, and use a magnetic stirrer for 48 hours. Stir.

  Thereafter, the mixed solution is poured so that bubbles do not enter the polyethylene sheet, and cooled to room temperature. A fluororesin sheet is placed on the upper surface of the mixed solution cooled to room temperature to make a uniform sheet of about 1 mm. Store in a refrigerator at 10 ° C. or lower as it is, and wait until the fluororesin sheet does not adhere and can be peeled off. Sample No. 1 is produced in the above order.

  Once the fluororesin sheet is peeled off, then, in order to produce an adhesion test piece, as shown in FIG. 10, a mochi-like resin 1002 (acrylic resin solution and a soft soft backing material sheet 1001 (thickness 1 mm) is placed above and below. A mixture of powders) is added, and heat polymerization is performed at 100 ° C. while applying pressure in a state where both sides are covered with a fluororesin mold 1003.

  Further, for comparison with the conventional product, as shown in FIG. 11, the conventional soft lining material 1101 is placed between the existing acrylic resin rods 1102 and polymerized. The conventional soft lining material 1101 produces an acrylic sample (sample No. 11) and a silicone sample (sample No. 21). When polymerizing, acrylic polymer is photopolymerized, and silicone polymer is chemically polymerized at room temperature using a special adhesive.

  In addition, although the production method of the adhesion test piece is different between the prototype soft lining material and the conventional soft lining material, since the usage method from the time of denture production is different, it was produced according to each usage method. And the tensile adhesion test of the test piece which passed one day after test piece preparation was performed. The results are shown in Table 1 below.

  As shown in Table 1, it was shown that the prototype soft lining material has the same adhesive strength as that of the conventional soft lining material (silicone type).

(Example 2)
Samples No. 1 and No. 2 were prepared in the same procedure as in Example 1, and the surface hardness, which is important as a soft lining material, was measured with a durometer. It was measured. The measured value of the prototype soft lining material stored in water for 3 months after preparation of the test piece (the conventional test piece was stored in water for 1 month after preparation of the test piece) was measured for the test piece one day after the preparation of the test piece. The percentage divided by the value was calculated as the rate of change. Separately, the same acrylic sample (sample No. 12) and silicone sample (sample No. 22) were prepared as conventional test pieces and tested in the same manner. The results are shown in Tables 2 and 3 below.

  As shown in Tables 2 and 3, the prototype soft lining material is harder than the conventional soft lining material (measured value after one month) even after 3 months from the preparation. It was shown that the elastic modulus was maintained and the durability was excellent.

(Example 3)
Using UA-160TM (Shin Nakamura Chemical Co., Ltd. urethane oligomer) instead of SH-9832, 1 wt% of benzoyl peroxide (polymerization initiator) and 1 wt% of hydroquinone (polymerization inhibitor) were added to add methacrylic acid. Sample No. 3 to which no acid ester was added, Sample No. 4 to which 20 wt% of ethyl methacrylate (methacrylic acid ester) was added, and Sample No. 5 to which 20 wt% of butyl methacrylate (methacrylic acid ester) were added were prepared. .

  Also, using UA-2235PE (Shin Nakamura Chemical Co., Ltd. urethane oligomer) instead of SH-9832, 1 wt% of benzoyl peroxide (polymerization initiator) and 1 wt% of hydroquinone (polymerization inhibitor) were added. Sample No. 6 to which no methacrylic acid ester was added, Sample No. 7 to which 20 wt% of ethyl methacrylate (methacrylic acid ester) was added, and Sample No. 8 to which 20 wt% of butyl methacrylate (methacrylic acid ester) was added And made. And the elasticity modulus of each sample was measured. The results are shown in Table 4 below.

  As shown in Table 4, it can be seen that the prototype soft lining material has different elastic moduli by adding methacrylic acid ester or changing the type of urethane oligomer.

  In addition, when making these soft backing materials from which an elasticity modulus differs into a multilayer, the urethane-type oligomer mixture from which the addition ratios differ as mentioned above are thinly apply | coated to the surface of the completed soft backing material. And a polyethylene sheet is covered so that a bubble may not enter on the surface, and it is set as a sheet-like soft lining material. Thereby, the multilayer sheet-like soft lining material which cannot distinguish a boundary line visually can be produced.

It is sectional drawing which shows the whole upper denture filled with the soft lining material for heat polymerization type denture bases of this invention. It is a figure which shows an example of the cross-sectional structure of the maxillary denture filled with the soft lining material for heat polymerization denture bases of this invention. It is sectional drawing which shows the work model by gypsum. It is sectional drawing which shows the denture using a wax. It is sectional drawing which shows the state in which the working model is embed | buried in a lower flask. It is sectional drawing which shows the state by which the work model was entirely covered with the gypsum for burial. It is sectional drawing which shows the state of the model which finished dewaxing. It is sectional drawing which shows the state which the soft lining material for heat-polymerization type denture bases of this invention closely_contact | adheres on a model. It is sectional drawing which shows the state which attached the upper flask to the lower flask, after lining the heat-curing denture base soft lining material of this invention. It is a figure which shows an example of the test piece of the heat lining type denture base soft lining material of this invention. It is a figure which shows an example of the test piece of the conventional type soft lining material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Soft lining material 102 Denture base resin 103 Artificial tooth 201 Oral mucosal surface 202 Low elastic part 203 High elastic part 301 Work model 401 Occlusal floor 501 Lower flask 502 Implant plaster 601 Upper flask 602 Implant plaster 901 Wax was removed Space 1001 Prototype soft lining material sheet 1002 Mochi-like resin 1003 Fluororesin mold 1101 Conventional soft lining material 1102 Acrylic resin rod

Claims (7)

  Heat polymerization characterized by containing 49.8 to 99.6 wt% of a urethane-based oligomer capable of radical polymerization, 0.2 to 5 wt% of a polymerization initiator, and 0.2 to 5 wt% of a polymerization inhibitor. Soft lining for denture base.   Furthermore, 49.8 wt% or less of methacrylic acid ester is contained, The soft lining material for heat polymerization denture bases of Claim 1 characterized by the above-mentioned.   3. The heat-curing denture base soft lining material according to claim 1, further comprising 49.8 wt% or less of a methacrylic acid ester polymer or a methacrylic acid ester copolymer.   The heat-curing denture base, wherein the heat-curing denture base soft lining material according to any one of claims 1 to 3 is laminated so as to have different elastic moduli. Soft lining material.   The heat-curing denture base soft according to claim 4, wherein the elastic modulus of the surface in contact with the oral mucosa surface is 0.66 to 4 MPa, and the elastic modulus of the surface in contact with the denture base is 20 to 100 MPa. Backing material. Attaching an occlusal floor and artificial teeth to a model in the patient's mouth;
Burying and solidifying the model to which the occlusal floor and artificial teeth are attached in gypsum;
Removing the occlusal floor from the model buried in the plaster;
The soft lining material for a heat-curing denture base according to any one of claims 1 to 5 is lined in a predetermined region in a portion of the oral cavity model where the occlusal floor is in contact. And a process of
Pouring a resin solution into the space generated by removing the occlusal floor in a state where the model backed by the heat-curing denture base soft lining material is buried in the plaster; and
Removing the gypsum after the resin solution is solidified, and polishing the artificial tooth, the solidified resin solution, and a denture made of the heat-curing denture base soft lining material. Denture preparation method.   In the step of lining the heat-curing denture base soft lining material, the heat-curing denture base soft lining material is cut to a required size, and the heat-polymerized denture base soft lining is cut. The denture preparation method according to claim 6, wherein the material is backed by adjusting with finger pressure.

Images