JP6214209B2 - Dental resin separator kit - Google Patents

Description

  The present invention relates to a dental resin separating material kit used in the manufacture of dentures.

The production of dentures using a heat-polymerized cage resin is generally performed by the following steps.
According to a common method, wax dentures in which artificial teeth are arranged and gingiva formed are embedded in a flask with a plaster together with a working model (flask embedment), and then cast to have a void formed by a plaster surface for denture base molding. A gypsum mold was obtained, and a denture base resin (hereinafter referred to as a “resin-like resin”) in the form of a bowl was filled into the gap of the obtained gypsum mold, and the flask was pressurized. The polymer is heated and polymerized and then slowly cooled in a pressurized state. The denture is removed from the flask together with the gypsum mold, the denture is indexed together with the work model from the gypsum mold, the denture is removed from the work model, the denture is deburred, polished, etc. Finish.
When filling the gypsum mold with the cocoon-shaped resin, a resin separating material exemplified by a water-soluble alginate solution is applied to the gypsum surface for denture base molding formed in the gypsum mold.
The water-soluble alginate in the resin separation material reacts with calcium of gypsum, and an insoluble calcium alginate separation membrane is formed on the surface of the gypsum. The separation membrane contributes to separating the denture denture base obtained by polymerizing the denture base resin filled in the gap for denture base molding formed in the plaster mold from the plaster, This prevents the monomer from penetrating into the gypsum mold and the moisture from the gypsum mold from penetrating into the resin.
Conventionally used resin separators are difficult to penetrate from the surface despite the fact that the gypsum is porous, and the separation membrane is formed on the gypsum surface for denture base molding earlier than it penetrates. Since this separation membrane is thick, the space for denture base molding in which the separation membrane is formed is affected by the separation membrane. Dentures manufactured using a gypsum mold having such a separation membrane formed on the gypsum surface are inferior in dimensional accuracy and reproducibility of details.
Then, the obtained denture is inferior in compatibility with the mucosal surface of the working model, and thus the mucosal surface of the patient.
Further, since the separation membrane is easily peeled off from the gypsum surface, it is necessary to carefully insert the cage resin so as not to peel off, which takes time.
Non-Patent Document 1 describes the use of a water-soluble alginate solution as a resin separating material when preparing a denture.

Supervised by Jiro Hasegawa, “Meiden Dental Science and Technology” 1st edition, Gakken Shoin Co., Ltd., May 30, 1989, p. 321-323

  The inventors of this application have devised this invention as a result of intensive research in view of the above situation, and are obtained by burying a wax denture together with a working model in a flask with plaster and flowing it. The denture base and denture base molding of dentures obtained by polymerizing the cage resin in accordance with conventional methods, and can easily fill the gap formed by the plaster surface for denture base molding formed in the plaster mold A dental resin separating material kit that is easy to separate from the gypsum surface for use, and is suitable for obtaining good compatibility between the mucosal surface of the denture base and the working model. The purpose is to provide.

In order to solve the above problems, the dental resin separating material kit of the present invention is (1) 1.4 to 2.0 parts by weight of a water-soluble alginate and 1. It consists of the 1st solution containing 2-1.6 weight part, and the 2nd solution containing 1.0-1.5 weight part of fluidity modifiers with respect to 100 weight part of water.
(2) In the above (1), the water-soluble alginate is at least one selected from sodium alginate, potassium alginate, and ammonium alginate,
The pH buffer is preferably at least two selected from sodium phosphate, sodium hydrogen phosphate, sodium dihydrogen phosphate, sodium metaborate, and sodium tetraborate.
(3) In the above (1) or (2), wherein the flow modifier is a water-soluble alginate, pectin, guar gum, xanthan gum, tamarind gum, carrageenan, carboxymethyl cellulose, selected from among gum arabic It is preferable that there is at least one.
(4) In the above (1), (2) or (3), it is preferable that the pH buffer comprises at least sodium dihydrogen phosphate and sodium metaborate.
(5) In the above (1), (2), (3) or (4), one set is composed of a first container containing the first solution and a second container containing the second solution. It is preferable.

Since the present invention is configured as described above, the following effects can be obtained.
That is, by using the dental resin separating material kit of the present invention, the wax denture is embedded in the flask with gypsum and shaped by the gypsum surface for denture base molding formed into a plaster mold obtained by flowing wax. The denture base obtained by polymerizing the cage resin according to a conventional method can be easily separated from the denture base and the plaster surface for denture base molding. Good dimensional accuracy and reproducibility of details, high quality, and the mucosal surface of the denture base is compatible with the mucosal surface of the working model, and thus the compatibility with the mucosal surface of the patient.
This will be described more specifically.
Prior to filling the rod-shaped resin into the void formed by the plaster surface for denture base molding formed in the plaster mold obtained by burying the wax denture in the flask together with the work model and flowing wax, When one solution is applied to a plaster surface for denture base molding using, for example, a dental technician's brush, it quickly penetrates into the plaster from the plaster surface and is used to separate the resin of calcium alginate that is insoluble in the plaster surface. A film is formed. This coating is extremely thin and is hardly peeled off from the gypsum surface.
Such a film is formed not only because the first solution contains 1.4 to 2.0 parts by weight of a water-soluble alginate with respect to 100 parts by weight of water, but also a pH buffering agent of 1.2 to 1 .6 parts by weight, the gypsum is porous, and it contains calcium that reacts with the water-soluble alginate. And the water-soluble alginate contained in the first solution reacts with the calcium of the gypsum to become insoluble calcium alginate, making it impossible for the first solution to further penetrate into the gypsum, It is thought that this is due to the formation of a structure in which the gypsum surface and calcium alginate in the gypsum are integrated by forming a very thin coating of calcium alginate on the gypsum surface.
Since this film is extremely thin, it can be said that the plaster surface for denture base molding on which the film is formed is not significantly different from the original shape without the film.
Then, immediately before filling the denture base molding gap formed in the plaster mold with the cage resin, the second solution is applied to the plaster surface on which the above-described calcium alginate coating is formed, for example, a brush for dental technicians. When the coating is used, the coating does not allow the second solution to penetrate into the gypsum, and a wet layer of the second solution is formed on the coating.
In that state, when the operation is performed to fill the gap in the gypsum-type denture base denture base, the bowl-like resin eliminates unevenness and non-uniformity in the gap and matches the shape of the gap. In this case, the second solution intervenes as a wet layer between the film and the cocoon-like resin. Compared to the case where it is in direct contact with the coating, the second solution performs a kind of lubrication function, and the deformation and flow of the cage resin can be performed smoothly and reliably without damaging or peeling the coating. Is called. The second solution itself is sequentially removed from between the coating and the cage resin as the cage resin deforms and flows, and the cage resin is filled into the gap for denture base molding formed in the plaster mold. When completed, the second solution is almost eliminated from between the coating and the cage resin.
For this reason, it is possible to easily insert the cage resin into the gap for molding a plaster-type denture base, without causing the lack of the cage resin, and to sufficiently spread the cage resin to the details of the cavity. it can.
In the state in which the cage resin is filled in the gap for molding the plaster-type denture base, the second solution is almost excluded from between the coating and the cage resin, so that the cage resin is substantially in contact with the coating. It can be said that it is in the state. The coating prevents the monomer of the cage resin from penetrating into the gypsum mold and facilitates the separation of the denture base and the gypsum obtained by polymerizing the cage resin.
Thus, in a state where the cocoon-like resin is filled in the gap for molding a plaster-type denture base, the flask is pressurized, and the cocoon-like resin is heated and polymerized in the pressurized state. Allow to cool and remove the denture from the flask together with the plaster mold. Then, the denture is extracted from the plaster mold together with the work model, and the denture base of the denture is easily separated from the plaster through the coating by performing the work of removing the denture from the work model.
Thereafter, finishing such as deburring and polishing of the dentures may be performed.
The obtained denture has good dimensional accuracy and reproducibility of details and high quality, and the mucosal surface of the denture base is excellent in compatibility with the mucosal surface of the work model, and hence the patient's mucosal surface.
The dental resin separating material kit of the present invention is inexpensive and does not require skill even in its use.
When the first container containing the first solution and the second container containing the second solution are taken as one set, handling is easy.

It is a partially broken front view which shows an example of the container which accommodates the 1st solution or the 2nd solution in the dental resin separation material kit of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be shown, and the present invention will be described in more detail. Of course, the present invention is not limited to the following embodiments.
Examples of the water-soluble alginate contained in the first solution include sodium alginate, potassium alginate, and ammonium alginate, and at least one selected from these may be used.

  Examples of the pH buffering agent include sodium phosphate, sodium hydrogen phosphate, sodium dihydrogen phosphate, sodium metaborate, and sodium tetraborate, and it is preferable to select at least two of these. In particular, it is more preferable to employ at least sodium dihydrogen phosphate and sodium metaborate.

The water-soluble alginate is preferably 1.4 to 2.0 parts by weight with respect to 100 parts by weight of water, and the pH buffering agent is preferably 1.2 to 1.6 parts by weight with respect to 100 parts by weight of water.
When the water-soluble alginate is less than 1.4 parts by weight with respect to 100 parts by weight of water, the coating of insoluble calcium alginate formed by reaction with calcium of gypsum is insufficient and the separability from the gypsum mold is inferior. If it exceeds 0.0 parts by weight, the coating of calcium alginate on the gypsum surface becomes thick, resulting in inferior dimensional accuracy and reproducibility of details of the denture, and inferior denture compatibility.
When the pH buffering agent is less than 1.2 parts by weight with respect to 100 parts by weight of water, a calcium alginate film is formed on the gypsum surface with insufficient penetration of the first solution into the gypsum. It is not preferable because it easily peels off. When the amount exceeds 1.6 parts by weight, the first solution penetrates into the gypsum to an excessive depth without forming a calcium alginate film on the gypsum surface, and calcium alginate is generated in the gypsum. Is not preferable.

A chelating agent, a surfactant, a viscosity modifier, an antiseptic, a colorant for identification, and the like can be added to the first solution as long as the function is not impaired.
Examples of the chelating agent include polyphosphate, ethylenediaminetetraacetate, citrate, nitrilotriacetate and the like. In the case of using a chelating agent, one or more may be selected from the above. It is preferable that a chelating agent is 0.1-0.3 weight part with respect to 100 weight part of water.
Surfactants include lauryl sulfate, polyoxyethylene alkyl ether sulfate, alkyl benzene sulfonate, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkyl phenyl ether sulfate, N-acyl amino acid salt, alkyl phosphate , Alkane sulfonate, oleate, stearate, alkylnaphthalene sulfonate, dialkyl sulfosuccinate, alkyl diphenyl ether disulfonate, naphthalene sulfonic acid formalin condensate, and the like. When using a surfactant, one or more of them may be selected from the above.
The viscosity modifier can include pectin, guar gum, xanthan gum, tamarind gum, carrageenan, carboxymethyl cellulose, gum arabic or the like. When using a viscosity modifier, what is necessary is just to select 1 type (s) or 2 or more types from the above.
Examples of the preservative include calcium propionate, sodium propionate, potassium propionate, sodium dehydroacetate, formalin, methyl paraben, ethyl paraben, propyl paraben, isopropyl paraben, butyl paraben, isobutyl paraben, benzyl paraben and the like. In the case of using a preservative, one or more kinds may be selected from the above.
Examples of colorants for identification include Red No. 2, Red No. 3, Red No. 102, Red No. 104, Red No. 105, Red No. 106, Yellow No. 4, Yellow No. 5, Green No. 3, Blue No. 1, etc. Can do. When using a coloring agent for identification, one type or two or more types may be selected from the above.

The flow modifier in the second solution, sodium alginate, potassium alginate, water-soluble alginates such as ammonium alginate, pectin, guar gum, xanthan gum, tamarind gum, carrageenan, carboxymethyl cellulose, gum arabic. Examples These may be used by selecting at least one of them.

The fluidity modifier is preferably 1.0 to 1.5 parts by weight per 100 parts by weight of water.
If the fluidity modifier is less than 1.0 part by weight with respect to 100 parts by weight of water, the soot-like resin will flow out excessively and cause bubbles and the like, and if it exceeds 1.5 parts by weight, the soot-like resin The second solution remains between the gypsum surface and the gypsum surface, and the solid content remains, which is not preferable because compatibility is deteriorated.

To the second solution, a pH buffer, a chelating agent, a surfactant, a preservative, a colorant for identification, and the like can be added as long as the function is not impaired.
Examples of the pH buffering agent include sodium phosphate, sodium hydrogen phosphate, sodium dihydrogen phosphate, sodium metaborate, sodium tetraborate and the like as described above.
Examples of the chelating agent include polyphosphate, ethylenediaminetetraacetate, citrate, nitrilotriacetate and the like as described above. In the case of using a chelating agent, one or more may be selected from the above.
As the surfactant, as described above, lauryl sulfate, polyoxyethylene alkyl ether sulfate, alkyl benzene sulfonate, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkyl phenyl ether sulfate, N-acyl amino acid salt Alkyl phosphates, alkane sulfonates, oleates, stearates, alkyl naphthalene sulfonates, dialkyl sulfosuccinates, alkyl diphenyl ether disulfonates, naphthalene sulfonate formalin condensate salts, and the like. When using a surfactant, one or more of them may be selected from the above.
Examples of preservatives include calcium propionate, sodium propionate, potassium propionate, sodium dehydroacetate, formalin, methylparaben, ethylparaben, propylparaben, isopropylparaben, butylparaben, isobutylparaben, benzylparaben, and the like. be able to. In the case of using a preservative, one or more kinds may be selected from the above.
As the colorant for identification, as described above, Red No. 2, Red No. 3, Red No. 102, Red No. 104, Red No. 105, Red No. 106, Yellow No. 4, Yellow No. 5, Green No. 3, Blue No. 1 And the like. When using a coloring agent for identification, one type or two or more types may be selected from the above.

  The water used in the first solution and the second solution may be any water that does not contain impurities, and examples include ion-exchanged water and distilled water.

  What is necessary is just to manufacture a 1st solution and a 2nd solution by selecting a required thing from above-described components, weighing a predetermined amount, and mixing suitably using a mixer etc.

The obtained first solution and second solution may be accommodated in a container as shown in FIG. 1, for example, and a required amount may be taken out from each container in use. In general, the capacity of the container (first container) for storing the first solution and the capacity of the container (second container) for storing the second solution are set to be different in consideration of the amount used. Therefore, the size of the container body for the first solution and the container body for the second solution are usually different.
A container 1 shown in FIG. 1 includes a container main body 11 and a screw cap 12 that seals the container main body 11. Both the container main body 11 and the cap 12 are made of a thermoplastic synthetic resin. In the cap 12, a nozzle 14 protrudes from the center of the cap body 13, and a cap stopper 15 that seals the nozzle 14 is connected to the cap body 13 by a belt-like hinge 16. The male screw 11a formed on the outer periphery of the upper portion of the container main body 11 is screwed with the female screw 13a formed on the inner periphery of the cap main body 13 to seal the solution as a content. Can be drained from.

Next, an example of a method for producing a denture using the dental resin separating material kit of the present invention will be described.
In accordance with the usual method, wax dentures in which artificial teeth are arranged and gingiva formed are placed in a flask with a working model and plastered in plaster, then the flask is divided into upper and lower parts, and the wax is cast to form a plaster surface for denture base molding. A gypsum mold is obtained. The gypsum surface for denture base molding forms a void for denture base molding by combining the divided upper and lower portions of the flask. Since a small amount of wax may remain on the plaster surface for forming a denture base of the obtained plaster mold, hot water is applied to the plaster surface to wash away the wax. If necessary, the gypsum surface may be washed with a neutral detergent or the like before pouring hot water.
After the gypsum surface has dried, the first solution is applied to the gypsum surface using a dental technician's brush. The first solution penetrates into the gypsum from the gypsum surface, and forms an extremely thin film that is difficult to peel off from the gypsum surface for separating the resin of calcium alginate insoluble in the gypsum surface.
A rod-shaped resin is prepared.
A 2nd solution is apply | coated to the gypsum surface for denture base formation using the brush for dental technicians, and the wet layer by a 2nd solution is formed on a film.
Immediately after applying the second solution, the cage-like resin is filled into the gap for denture base molding.
After the filling of the cage resin is completed and the second solution is almost eliminated from between the gypsum surface and the cage resin, the flask is pressurized, and the cage resin is polymerized by heating in a pressurized state. Slowly cool under pressure, remove the denture from the flask together with the gypsum mold, index the denture together with the work model from the gypsum mold, remove the denture from the work model, and finish the deburring and polishing of the denture.
By using the dental resin separating material kit of the present invention, the dimensional accuracy and reproducibility of the details are good and high quality, and the mucosal surface of the denture base is the mucosal surface of the work model, and thus the mucosal surface of the patient. Dentures with excellent compatibility can be obtained.
In addition, although the above-mentioned wet heat polymerization is common as the heat polymerization of the cage resin, it is not limited to this and may be dry heat polymerization or microwave polymerization.

Next, an example is shown with a comparative example, and it explains in more detail.
(Examples 1-3)
Using the first solution and the second solution shown in Examples 1 to 3 of Table 1, the denture was prepared according to the above-described denture preparation method, the separability of the obtained denture from the gypsum surface, the mucosal surface of the work model and The suitability of was tested by the following method.
As the cage resin, a heat-polymerized cage resin (trade name; Akron No. 8, manufactured by GC Corporation) using MMA and powdered PMMA was used.

<Denture preparation method>
Work model for upper jaw, normal plaster (trade name; dental calcined gypsum, manufactured by Yoshino Gypsum Co., Ltd.), hard plaster (trade name; New Pla Stone, manufactured by GC Corporation), cemented gypsum (trade name; New Fuji) Two identical working models were produced using a lock, manufactured by GC Co., Ltd., and each type of working model was used for the production of dentures by the following steps.
The remaining working model was subjected to the following compatibility test as a master model.
(1) In accordance with the usual method, wax dentures in which artificial teeth are arranged and gingiva formed are embedded in a flask with a working model together with a plaster flask, then the flask is divided into upper and lower parts, and the wax is casted to form a denture base. A gypsum mold having a gypsum surface is obtained. The gypsum surface for denture base molding forms a void for denture base molding by combining the divided upper and lower portions of the flask. After the plaster surface is washed with a neutral detergent or the like, hot water is applied to the plaster surface for denture base formation to wash away the wax.
(2) After the gypsum surface is dried, the first solution is applied to the gypsum surface using a dental technician's brush.
(3) A cage resin is prepared.
(4) The second solution is applied to the gypsum surface for denture base formation on which the calcium alginate film is formed, using a dental technician's brush, and a wet layer of the second solution is formed on the film.
(5) Immediately after applying the second solution, the cage-like resin is filled into the gap for denture base molding.
(6) After the filling of the cage resin is completed and the second solution is almost eliminated from the space between the gypsum surface and the cage resin, the flask is pressurized, and the cage resin is polymerized by heating in a pressurized state. In the heat polymerization, the flask is placed in cold water, heated to boil in about 30 minutes, and moored for 40 minutes after boiling.
After polymerization, the mixture is allowed to cool at room temperature for 30 minutes or more in a pressurized state, and then completely cooled in cold water.
(7) Take out the dentures together with the plaster mold from the flask, index the dentures together with the work model from the plaster mold, remove the dentures from the work model, and finish the deburring and polishing of the dentures.

<Separability test>
In the above denture preparation method (7), when the denture is removed from the working model, the mucosal surface of the denture base can be easily separated from the mucosal surface of the working model, and plaster adheres to the lip side and cheek side of the denture The sensory evaluation was evaluated as ◯ when there was not, and x when it was not (including the case where gypsum adhered to at least the denture mucosa surface, etc., when it was separated by destroying part of the mucosa surface of the work model).
When the denture was removed from the working model, if the plaster adhered to the denture base mucosa, etc., the plaster was removed using a bar and subjected to a compatibility test.

<Compatibility test>
The denture obtained by the above denture preparation method is attached to the master model, and the presence or absence of lifting from the master model of the denture base rear edge is visually observed. The case where lifting was recognized was evaluated as compatibility x.

  The results are as shown in Table 1.

(Comparative Examples 1 and 2)
A denture is prepared by the above-described method using the first solution and the second solution shown in Comparative Examples 1 and 2 of Table 1, and the separability of the obtained denture from the plaster surface and the compatibility with the mucosal surface of the work model are shown. Evaluation was performed by the method described above.
The same cage resin as that used in the example was used.
The results are as shown in Table 1.

(Comparative Example 3)
In Comparative Example 3, a denture was prepared using only the first solution.
The same cage resin as that used in the example was used.
Since the denture of Comparative Example 3 may be prepared according to the above-described denture preparation method except that the second solution is not used, description thereof is omitted.
The separability of the obtained denture from the gypsum surface and the compatibility with the mucosal surface of the work model were evaluated by the methods described above.
The results are as shown in Table 1.

  The ethylenediaminetetraacetic acid salt in Table 1 means ethylenediaminetetraacetic acid tetrasodium.

1 container 11 container body 12 cap

Claims (5)

  A first solution containing 1.4 to 2.0 parts by weight of a water-soluble alginate and 1.2 to 1.6 parts by weight of a pH buffer with respect to 100 parts by weight of water, and flowing with respect to 100 parts by weight of water A dental resin separating material kit comprising a second solution containing 1.0 to 1.5 parts by weight of a property modifier. The water-soluble alginate is at least one selected from sodium alginate, potassium alginate, and ammonium alginate,
The dental buffer according to claim 1, wherein the pH buffer is at least two selected from sodium phosphate, sodium hydrogen phosphate, sodium dihydrogen phosphate, sodium metaborate, and sodium tetraborate. Resin separator kit. The rheology modifier is claim 1, wherein the water-soluble alginate, pectin, guar gum, xanthan gum, tamarind gum, carrageenan, carboxymethyl cellulose, is at least one selected from among gum arabic Or the dental resin separation material kit of 2.   The dental resin separating material kit according to claim 1, 2, or 3, wherein the pH buffer agent comprises at least sodium dihydrogen phosphate and sodium metaborate.   The dental resin according to claim 1, 2, 3, or 4, wherein the first container containing the first solution and the second container containing the second solution form one set. Separation material kit.

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