JP2882639B2 - Method for manufacturing dental mounting article and apparatus for manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a wearing article used for dental treatment, for example, a denture base, an orthodontic base, a sprint, a bridge, a crown, an onlay, and the like. Related to the device.

[Background Art] In dental treatment, for example, a prosthesis such as a denture base, an orthodontic base, and a sprint, and a mounting article for orthodontics and the like are made of a dental resin. Since such articles require different forms for each patient and require a high degree of adaptation to the affected area, they are not manufactured using a high-precision injection molding machine or the like. It is handmade one by one by a dental technician.

However, the dental resin has a problem that it shrinks when polymerized, and a strain is generated in the polymer due to the stress accompanying the shrinkage, so that a wearing article of a desired form can be produced with high precision to fit an affected part. It is difficult. for that reason,
Conventionally, such an article has been manufactured through a very complicated process like a flask method. For reference, taking the production of a denture base as an example and listing the main steps in order, 1.
Acquisition of the affected area using an impression agent, 2. Reproduction of the affected area using gypsum (production of a working model), 3. Preparation of the foundation floor and occlusal embankment using Wax, 4. Arrangement of artificial teeth on the occlusal embankment and oral cavity Trial and adjustment in, 5. Place the wax type in a flask and bury the wax type in gypsum, 6. Make wax and mold, 7. Fill dental mold into mold and pressurize, 8. Heat polymerization of resin, 9. Process of taking out, adjusting, and polishing polymer. It is considered that the reason why such a complicated process is required is that the resin is pressurized at the time of polymerization and the polymerization is carried out while replenishing the resin for the polymerization shrinkage.

[Problems to be Solved by the Invention] Even the mounting device manufactured by the above-mentioned method does not show sufficient compatibility unless manufactured by a highly skilled technician. The reason is that the error from the original form increases as the number of copies increases and the number of copies increases, and that this method also does not sufficiently compensate for polymerization shrinkage. It is thought that there is. Furthermore, the problem that the cost of article production increases as the operation becomes more complex cannot be ignored. Therefore, there has been a need for a simple and accurate method for producing such articles.

[Means for Solving the Problems] The method for producing an article for wearing according to the present invention is a method for preparing a dental resin on a working model produced on the basis of an impression of an affected part, which is necessary for a patient to recover normal functions. And directly polymerized and cured. Taking the above-described steps for preparing a denture base as an example, the steps 3, 5, 6, etc., on the premise of using wax, are omitted, and the steps are simplified. For that purpose, it is necessary to minimize the deformation of the dental resin on the working model due to the polymerization shrinkage. As a result of intensive studies to solve this problem, the present invention has been reached. That is, the present invention provides a dental mounting article by supplying a polymerizable resin onto a working model to prepare a dental mounting article, and then sequentially polymerizing the polymerizable resin one by one to obtain a polymerized cured product. It is a manufacturing method. The method for producing a dental fitting article (hereinafter sometimes referred to as a dental article) according to the present invention includes directly producing a dental article by supplying a polymerizable dental resin onto a working model; When polymerizing and curing the polymerizable resin, instead of simultaneously polymerizing the entire dental resin,
The polymerization is carried out part by part in order, and the polymerization proceeds sequentially while compensating for the shrinkage accompanying the polymerization of the part by the elongation (flow) of the unpolymerized part adjacent thereto.
It was unexpected that such a method would prevent deformation due to polymerization shrinkage of the resin and obtain a dental article with excellent morphological accuracy. In the present invention, the method of partially polymerizing the resin is appropriately selected depending on the form and size of the article.

The order of polymerization may be such that the center of the dental article is first and the outer edge is later, but it is more preferable to move the portion to be polymerized from the outer edge of the article toward the center. By this method, deformation due to shrinkage of the resin can be further reduced.

For example, when using a photopolymerizable dental resin,
Deformation due to polymerization shrinkage by performing an operation of partially irradiating light to polymerize from the outer edge of the required form of the resin on the working model toward the center or from the center to the outer edge A mounting article having a small amount was obtained. Specifically, this method can be performed by a technician holding a device for irradiating light with a reduced light beam in his / her hand and irradiating the dental resin in order from the outside.

In the case where a thermopolymerizable resin is used, this method can be achieved by using hot air or a hot wire, and heating and polymerizing one part at a time while paying attention to the directionality.

Although it is difficult to comprehensively describe the precision of the form according to the method of the present invention, as shown in Examples and Comparative Examples described below, the difference between the model and the polymerized and hardened dental article is that the article according to the present invention is While the difference is about several tens to several hundreds of μ, the difference is as large as several thousand μ in an article manufactured by the conventional uniform polymerization method. Therefore, the dental article according to the present invention can be mounted on the patient by a fine adjustment process, but the article according to the conventional method cannot be mounted without a large adjustment process.

The present invention provides a mounting for performing the above method.
That is, the present invention provides a member for installing a dental article made of a polymerizable resin, a light source or a heat source for polymerizing the polymerizable resin, and light or heat from the light source or the heat source partially and sequentially on the polymerizable resin. An apparatus for manufacturing a dental fitting article having a control mechanism for irradiating.

The member for installing the dental article used in the device of the present invention is:
Can be various in relation to other components,
A flat plate indicating the installation position, a sample table with legs, and a sample table connected to a moving or rotating mechanism can be used.

The light source used in the light irradiation device of the present invention is not particularly limited, and any light source such as a halogen-tungsten lamp, a xenon lamp, a fluorescent lamp, a mercury lamp, a neon tube, and a laser light irradiator can be used. However, it is necessary to select a light source capable of emitting light containing a sufficient amount of light having a wavelength effective for initiating polymerization of the photopolymerizable dental resin to initiate photopolymerization.

The heat source is not particularly limited, and various lamps that emit heat rays, such as a hot air nozzle connected to a suitable heater such as a hair dryer, a halogen lamp, an infrared lamp, and a laser light irradiation device in the infrared region, are used. A microwave device or the like used for zone melting is also preferable.

The apparatus of the present invention needs to have a control mechanism for sequentially irradiating light or heat from a light source or a heat source from one part of the polymerizable resin to another part. Various control mechanisms can be used. For example, a light shielding plate is installed between the lamp and the sample stage. At first, starting from the position where the entire surface of the sample stage is covered by the light shielding plate, the light shielding plate automatically moves and changes the angle or angle automatically It may be referred to as orientation), and the light irradiation area is gradually increased from the end of the sample stage. Equipped with a plurality of light-shielding plates between the lamp and the sample stage, controlled by a timer, etc., for example, the outer light-shielding plate is first moved or oriented so as to allow light to pass, and then the inner light-shielding plate is sequentially turned on. That are configured to move or orient so as to pass through. This light shielding plate is a device in which a number of light shielding plates are overlapped like an aperture of a camera, and the position where the light is hit by shifting is controlled as described above. Further, the light shielding plate may have two mechanisms, and the two mechanisms are orthogonal to each other, that is, the shadow formed by blocking the light by the light shielding plate may be a cross. Or, such that the irradiation port that irradiates the focused light automatically changes the irradiation position from the outside to the inside,
Further, the sample table may be moved or rotated so that a zigzag scan or a uzumaki scan can be performed.

 The apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the structure of an example of the device of the present invention. A light source 2, a light-shielding plate 3, and a sample table 4 are provided in a chamber 1 of the apparatus. The sample table 4 is fitted to a threaded rod 6 driven and rotated by a motor 5 with a reduction gear.
The rotation of the threaded rod 6 causes the sample stage 4 to move left and right as indicated by the arrow in the figure. In the apparatus shown in FIG. 1, the motor 5, including the reduction gear, the threaded rod 6, and the sample stage 4 constitute a control mechanism as a whole. A guide rail or the like may be provided at the bottom of the sample stage 4 as necessary to facilitate movement of the sample stage. Further, a door 7 which can be opened and closed may be provided in a part of the wall of the apparatus. FIG. 2 is a plan view showing an example of the shape of a light shielding plate used in the apparatus shown in FIG. 1. The light shielding plate 3 has a shape in which one side 9 is pointed like a roof. Using the light-shielding plate, the denture plate 8 shown in FIG. 2 is placed on the sample table, light is irradiated from above, and the sample table is moved to the right by rotating the threaded rod 6. As the sample stage moves, the denture base 8 moves in the direction of the arrow in the figure, and exits from the outer edge under the light-shielding plate and is irradiated with light. Since one side of the light-shielding plate 3 has a roof shape, it can be adjusted so that light irradiation to the central portion of the U-shaped denture base 8 becomes the last.

FIG. 3 is a longitudinal sectional view showing the structure of another example of the device of the present invention.

Parts that are the same as or similar to the parts of the apparatus in FIG. 1 are given the same numbers and described. In a room 1 of the device, a light source 2
And a rotating sample stage 4 are provided. The light from the light source 2 is guided by an optical fiber 10 and is partially irradiated from a light irradiation unit 11 onto a sample 8 (for example, a denture base) placed on a sample stage 4.
The light irradiating section 11 is fitted with a threaded rod 6 and an induction rod 12 driven and rotated by a motor 5 with a reduction gear. The rotation of the threaded rod 6 causes the light irradiating section 11 to move right and left. The threaded rod 6 and the guide rod 12 are supported by a support plate 13. The guide rod 12 allows the light irradiation unit 11 to move left and right in a stable posture without rotating or performing unnecessary movement. The sample stage 4 is configured to rotate in connection with a motor 5 having a reduction gear. In the apparatus shown in FIG. 3, the entirety of the light irradiating section moving to the left and right and the rotating sample stage constitute a control mechanism. By adjusting the rotation of the sample stage and the movement of the light irradiation unit, light irradiation on the sample placed on the sample stage can be performed from the outer edge to the center or from the center to the outer edge. An openable / closable door 7 may be provided on a part of the wall of the apparatus. The device according to the invention is not limited to the ones described above, but can be of various other constructions as required.

The photopolymerizable or heat-polymerizable dental resin used in the present invention is selected from compounds containing a required amount (0.1 to 10%) of a polymerization initiation catalyst and having at least one polymerizable ethylenic double bond. Or a mixture of two or more of these, inorganic or organic fillers and the like. As the photopolymerization initiation catalyst, for example, JP-A-48-49875, JP-A-57-203007, JP-A-60-26002, JP-A-60-149
No. 603, JP-A-60-197609, JP-A-62-275103, etc., and any conventionally known initiators can be mentioned.

Examples of the thermal polymerization initiation catalyst include any initiator such as a peroxide or an azo compound having an appropriate operating temperature range of 40 to 100 ° C.

Examples of the compound having a polymerizable ethylenic double bond include (meth) acrylic acid alkyl ester (having 1 to 1 carbon atoms).
10), polyalkylene glycol di (meth) acrylate (2-20 carbon atoms), ethylene glycol oligomer di (meth) acrylate (2-10 mer), bisphenol A di (meth) acrylate, 2,2-bis [ p- (γ-methacryloxy-β-hydroxypropoxy) phenyl]
Propane, 2,2-di (4-methacryloxypolyethoxyphenyl) propane (2 to 10 ethoxy groups per molecule)
Monofunctional, polyfunctional (meth) acrylates such as trimethylolpropane tri (meth) acrylate and pentaerythritol tetra (meth) acrylate, and (meth) acrylate 2 having a hydroxyl group.
Urethane (meth) acrylates, which are the reaction product of a mole of a diisocyanate with one mole of a diisocyanate, specifically, monomers such as those disclosed in JP-B-55-33687 and JP-A-56-152408 are suitable. It is.

The addition of a filler is important for relatively reducing the polymerization shrinkage of the dental resin or for actively strengthening and improving the properties of the resin. Various types can be used according to required performance. For example, if high hardness or abrasion resistance is required for the wearing article, an inorganic material such as quartz powder is used.If elasticity is required, a polymer powder or a plasticizer is used. Is required, it is preferable to mix high-strength organic or inorganic fibers.

Furthermore, the photopolymerizable dental resin used in the present invention includes:
It may also include viscosity modifiers, colorants, storage stabilizers, preservatives, fragrances and the like.

[Effects of the Invention] As described above, according to the method for manufacturing a dental fitting article according to the present invention, the number of necessary steps is smaller than that of a conventional method, and furthermore, due to polymerization shrinkage of the dental resin. Since the polymerization is performed while compensating for the strain, it is possible to produce a low-cost mounting article having excellent compatibility.

[Example] Example 1 As a model for evaluating the suitability of an article for dental mounting, a part of a glass round bottom flask having a diameter of 13.5 cm was impressed with an impression agent (Exaflex, Inc.). An impression was taken, and a gypsum model was prepared using a part of the impression (a 5.5 cm diameter watch glass) as a working model. Next, using a pencil, draw parallel lines at 5 mm intervals on this working model, apply a mold release agent (Acrosep, GC), and make the photopolymerizable dental resin (UNIFAST LC, GC) slightly smaller than the working model ( 2.5cm in diameter,
2mm thick). Next, apply a diameter of 2 to the tip of the irradiation port.
The above dental resin was irradiated with light using a dental light irradiator (Translux Co., Ltd.) equipped with an aluminum cap with a hole of mm. The order of irradiation was divided into band-like areas divided by the pencil line drawn earlier, with the outer edge first and the center later. When irradiating one band, the irradiation was performed for 60 seconds each while slowly reciprocating the irradiation position within the band while taking care not to shine light on the other part. After the irradiation of the entire area is completed, the cured resin is cut along with a line passing through the center of the entire working model with a circular saw, and the resin is separated from the working model, at 100 ° C. to accelerate the deformation of the resin. For 15 minutes, and again put on the working model cut together earlier.

After adjusting the cross section of the resin and the model to the original position, both ends of the resin were fixed with cellophane tape, and the width of the gap between the working model and the resin was measured with a universal projector (Nikon V-12).
As a result, the width of the central gap was 78 μm.

Comparative Example 1 The same photopolymerizable dental resin was placed on the same working model as in Example 1 by the same operation, and then the entire resin was simultaneously irradiated using a light irradiator for dental technics (Laborite, GC). (10 minutes). The width of the gap between the resin cured by the same operation as in Example 1 and the working model was measured and found to be 1825 μm at the center.

Example 2 The same operation as in Example 1 was performed, and the same photopolymerizable dental resin was placed on a working model. Spacers slightly higher than the working model were attached to the four corners of the laboratory light illuminator (Morita Alpha Light) test bench. Place the working model on the sample stage and then its width 4.5, 4, 3.5, 3, 2.
5, 2, 1.5, 1cm black colored cross-shaped aluminum plates are stacked in order with their centers aligned, and a large aluminum plate is placed on the previous spacer at a position where the center matches the center of the working model On top. Use only the lamp of the irradiator that irradiates the sample from above, and after irradiating for 1 minute,
The operation of irradiating light was repeated after removing the aluminum plate in order from the wider aluminum plate, and finally the light shielding plate was removed and the light was irradiated. The suitability of the resin, which was sequentially polymerized from the outer edge to the center by this method, to a working model was measured according to the method of Example 1, and found to be 62 μm in width at the center at the gap.

Example 3 A turntable driven by a motor with a gear (12 rpm), a halogen lamp with a mirror (15 V, 150 W) as a light source, and the intensity of light condensed by a mirror of the light source is set to a position where the intensity is almost the highest. A metal plate with a 6mm diameter hole that allows only light to pass through and blocks excess light.The light that is focused on this light beam is guided by an optical fiber, and the position where the light hits is moved from the end of the turntable to the center. The device shown in FIG.

In the same operation as in Example 1, the dental resin was put on the working model, placed on the turntable, the light source was turned on, and the light irradiation position was moved from the outer edge of the turntable toward the center for 10 minutes. Once moved slowly and continuously. The conformity of the resin polymerized by this method to a working model was measured according to the method of Example 1, and the width of the gap at the center was 78 μm.

Example 4 Using the same apparatus as in Example 3, a work model on which dental resin was provided by the same operation was set on a turntable,
The light irradiation position was once loosely moved from the center of the sample toward the outer edge for 10 minutes. The suitability of a dental article polymerized in this way is determined by the width of the gap at the center, which is 310 mm.
μm.

Example 5 A resin for a heat shock floor (Matsufusha Matsufeng QF resin) was prepared in a paste form according to the method described in the instruction manual, placed on a working model, and then turned on a turntable using the device described in Example 3. The polymerization was carried out at a reduced speed (1 rpm). The conformity of the polymer obtained by this method was 203 μm as the gap width at the center.

Example 6 A roof type light-shielding plate was placed between a sample stage and a halogen lamp, and an apparatus as shown in FIG. 1 in which the sample stage moved slowly was manufactured. Place a sample with dental resin on a working model for making a human lower complete denture on a sample table,
The sample stage was gently moved for 10 minutes to the right as shown in the figure. An impression type impression agent was sandwiched between the polymer obtained by this method and the working model, and the polymer and the model were brought into close contact with each other. Thereafter, the impression agent was taken out, and the gap between the resin and the model was measured by measuring its thickness. As a result, the value was 100 μm or less.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a dental article manufacturing apparatus of the present invention, and FIG. 2 is a plan view showing a shape of a light shielding plate used in the apparatus of FIG. FIG. 3 is a longitudinal sectional view showing another example of the apparatus for manufacturing a dental article of the present invention. DESCRIPTION OF SYMBOLS 1 ... Room of apparatus 2 ... Light source 4 ... Shield plate 4 ... Sample stand 5 ... Motor with reduction gear 6 ... Threaded rod 8 ... Sample 10 ... Optical fiber 11 ... Light irradiation part

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Claims (2)

(57) [Claims] 1. A dental mounting article, wherein a polymerizable dental resin is supplied onto a working model to prepare a dental mounting article, and the polymerizable resin is sequentially polymerized one by one to obtain a polymerized cured product. Article manufacturing method. 2. A member for installing a dental wearing article made of a polymerizable resin, a light source or a heat source for polymerizing the polymerizable resin, and partially applying light or heat from the light source or the heat source to the polymerizable resin. An apparatus for manufacturing a dental fitting article, comprising: a control mechanism for sequentially irradiating the articles.