JPH02280744A - Manufacture of dental fitting article and device therefor - Google Patents

Abstract

PURPOSE:To prepare a fitting article in which the deformation due to the polymerization contraction is little, by carrying out polymerization by means of partially irradiating light successively towards from the outer edge part of a prescribed shape of the resin in working to the center part when the photo-polymerization type dental resin is prepared. CONSTITUTION:A plaster model is prepared as working model, and parallel lines are drawn at 5mm intervals on the model by using a pencil, and a mold separating agent is applied, and the photo-polymerization type dental resin is padded slightly less than the working model, and the dental resin at the irradiation port top-edge tip is light-irradiated by a dental light projector. Irradiation is carried out in the order from the outer edge part to the center part in each strip-shaped region divided by the lines of pencil. In the light irradiation, one strip is light-irradiated, and other parts are shielded from light. Irradiation is performed through the slow reciprocating movement for the irradiated position in each strip-shaped region.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to wearing articles used in dental treatment, such as
The present invention relates to methods for manufacturing denture bases, orthodontic bases, splints, crowns, onlays, etc., and devices therefor.

[Prior Art] In dental treatment, articles for prosthesis and orthodontics, such as denture bases, orthodontic bases, and splints, are often made of dental resin. The shape of these products differs depending on the patient, and they require a high level of adaptation to the affected area. Therefore, they cannot be manufactured using high-precision injection molding machines, and are manufactured by dentists. Each piece is handmade by a technician.

However, dental resins have the problem of shrinking when polymerized, and the stress that accompanies shrinkage causes distortion in the polymer, making it difficult to fabricate a wearable article of the desired shape with high precision to fit part 11A. It is difficult to do so. Therefore, conventionally, such articles have been manufactured through very complicated processes such as the flask method. For reference, let's take the production of denture bases as an example and list the main techniques involved.
1. Taking an impression of the affected area using an impression agent, reproducing the shape of the affected area using 25 plaster (preparation of a working mold), 3. Preparation of foundation floor and occlusal ridge using wax, 4. Arrangement of artificial teeth on the occlusal ridge, try-in and adjustment in the oral cavity, 5. placing the wax mold in the flask and embedding the wax mold in plaster, 6
．． Preparation of mold by screwing, 7. *Pouring and pressurizing dental resin into the mold, 8. Examples include steps such as heating polymerization of the resin, and extraction, adjustment, and polishing of the 91 polymer. The reason why such a complicated process is required is thought to be that the resin is pressurized during polymerization to replenish the resin for polymerization shrinkage while polymerizing.

[Problem M to be Solved by the Present Invention] Even the mounting device manufactured by the above-described method will not exhibit sufficient compatibility unless it is manufactured by a highly skilled technician. This is due to the fact that the more complicated the process or the more copies are made, the larger the error from the original shape becomes, and that even this method is not yet able to sufficiently compensate for polymerization shrinkage. considered to be a thing. Furthermore, the problem that the cost of manufacturing an article increases as the operation becomes more complicated cannot be ignored. Therefore, there has been a need for a simple and accurate manufacturing method for such articles.

[Means for Solving the Problems] The method for producing a wearable article of the present invention is to apply dental resin to a working model prepared based on an impression of the affected area, and to apply the dental resin in the form necessary for the patient to recover normal function. It is directly produced by placing it on a plate and polymerizing and curing it. Taking the above-mentioned denture base manufacturing process as an example, steps 3, 5, 6, etc., which involve the use of wax for advancement and retraction, are omitted to simplify the process. For this purpose, it is necessary to minimize the deformation caused by polymerization shrinkage of the dental resin placed on the working model, and as a result of intensive studies to solve this problem, we have arrived at this invention.

That is, the present invention provides a dental wearable article, which is characterized in that a dental wearable article is produced by supplying a polymeric resin onto a working model, and then the polymerizable resin is sequentially polymerized in portions to obtain a cured product. This is the manufacturing method. The method for producing a dental 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, and manufacturing the dental article directly. When polymerizing and curing a polymerizable resin, do not polymerize the entire dental resin at the same time. In this method, polymerization proceeds sequentially while compensating for the resin flow (flow).It is unexpected that this method can prevent deformation of the resin due to polymerization shrinkage and produce dental articles with excellent morphological precision. In the present invention,
The method for partially polymerizing the resin is appropriately selected depending on the shape and size of the article.

Although the polymerization order can be such that the center of the dental article is first followed by the outer edge, it is more preferable to move the portion to be polymerized from the outer edge of the article toward the center. This method can further reduce deformation due to resin contraction.

For example, when using photopolymerizable dental resin, light is applied sequentially from the outer edge of the resin on the working model toward the center, or from the center toward the outer edge. By carrying out the operation of irradiating and polymerizing, a wearing article with little deformation due to polymerization shrinkage was obtained.

Specifically, this method can be carried out by the technician holding a device that irradiates light with a narrowed luminous flux in his hand and sequentially irradiating the dental resin from the outside.

In addition, when using a thermopolymerizable resin, this method uses hot air or hot rays, paying attention to their direction.
This can be achieved by heating and polymerizing parts one by one.

Although it is difficult to comprehensively describe the precision of the morphology obtained by the method of the present invention, as shown in the Examples and Comparative Examples described below, the difference between the model and the polymerized and hardened dental article is While the difference is from several tens of microns to several hundred microns, the difference is several thousand microns in the case of products produced by conventional homogeneous polymerization.
It also becomes. Therefore, the dental article according to the present invention can be worn on a person even with minor adjustment, whereas the article made by the conventional method could not be worn on a person without extensive adjustment.

The present invention provides an apparatus for carrying out the above method. That is, the present invention provides polymerization l! 1. A member for installing a dental article made of resin, a light source or heat source for polymerizing the polymerizable resin, and a control mechanism for partially sequentially irradiating the polymerizable resin with light or heat from the light source or heat source. 1 is a manufacturing apparatus for a dental wearing article, characterized in that:

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

The light source used in the light irradiation device of the present invention is not particularly limited, and any one such as a halogen-tungsten lamp, xenon lamp, fluorescent lamp, mercury lamp, neon tube, laser light irradiator, etc. can be used. However, photopolymerized dental l#! It is necessary to select a light source that can emit light at a wavelength effective for initiating polymerization of the fingers, and in an amount sufficient to initiate photopolymerization.

The heat source is not particularly limited, and various types of 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 an infrared laser beam irradiation device, can be used. Also preferred are microwave devices such as those used for zone melting.

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 the "-" part to other parts of the polymeric resin.

Various control mechanisms can be used. For example, a light-shielding plate is installed between the lamp and the sample stage, and the light-shielding plate starts from a position where the entire surface of the sample stage is covered by the light-shielding plate, and then the light-shielding plate automatically moves slowly or changes its angle (hereinafter referred to as orientation). ), and is constructed so that the area irradiated with light gradually increases from the edge of the sample stage. A number of light-shielding plates are installed between the lamp and the sample stage, and controlled by a timer or the like, for example, the outer light-shielding plate is first moved or oriented to allow light to pass through, and then the inner light-shielding plate is moved in sequence. Something configured to move or orient in a way that allows light to pass through it. This light-shielding plate is made up of many light-shielding plates that overlap and are shifted from each other, like the aperture of a camera, to control the position of the light as described above. Furthermore, it is also possible to have two mechanisms of this light shielding plate, with the mechanisms running perpendicularly to each other, that is, the shadow formed by the light being blocked by the light shielding plate may be in the shape of a cross. Alternatively, the irradiation port that irradiates focused light can automatically change the irradiation position from the outside to the inside, or the sample stage can be moved or rotated to enable zigzag scanning or zigzag scanning. It may also be accompanied by

The apparatus according to the invention will now be explained with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the structure of one example of the device of the present invention. A light source 2, a light shielding plate 3, and a sample stage 4 are provided in the chamber 1 of the apparatus. The sample stage 4 is fitted into a threaded support 6 that is 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 shown by the arrow lines in the figure.

In the device shown in FIG. 1, a motor 5 with a reduction gear,
The entire threaded support 6 and sample stage 4 constitute a control mechanism. A guide rail or the like may be provided at the bottom of the sample stage 4, if necessary, to facilitate movement of the sample stage. Further, a door 7 that can be opened and closed may be provided in a part of the wall of the device.

FIG. 2 is a plan view showing the shape of an example of a light-shielding plate used in the apparatus shown in FIG. 1, and the light-shielding plate 3 has a roof-like shape on one side 9. Using the light shielding plate, a denture plate 8 shown in FIG.
is placed on the sample stage, irradiated with light from above, and the sample stage is moved to the right by rotating the threaded support 6.

As the sample stage moves, the denture base 8 moves in the direction of the arrow in the figure, exits from the outer edge under the light shielding plate, and is irradiated with light. Jl!
By making one side of the light plate 3 roof-shaped, it is possible to adjust the light to be irradiated last to the center of the U-shaped denture base 8.

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

Parts that are the same as or similar to parts of the apparatus in FIG. 1 will be described with the same numerals. A light source 2 and a rotating sample stage 4 are provided in a chamber 1 of the apparatus.

The light from the light source 2 is guided by an optical fiber 10, and the light from the light irradiation section 1
1 , a sample 8 (for example, a denture base) placed on a sample stage 4 is partially irradiated. The light irradiation part 11 is fitted with a threaded pedestal 6 and a guide rod 12 which are driven and rotated by a motor 5 with a reduction gear, and the light irradiation part 11 moves left and right as the threaded pedestal 6 rotates. The threaded rod 6 and the guide rod 12 are supported by a support plate 13. Guidance rod 12
This allows the light irradiation unit 11 to move from side to side in a stable posture without rotating or making unnecessary movements. The sample stage 4 is configured to be connected to and rotated by a motor 5 with a reduction gear. In the apparatus shown in FIG. 3, the light irradiation unit that moves left and right and the rotating sample stage collectively constitute a control mechanism.

By adjusting the rotation of the sample stage and the movement of the light irradiation part,
The sample placed on the sample stage can be irradiated with light from the outer edge to the center or from the center to the outer St part. A door 7 that can be opened and closed may be provided in a part of the wall of the device. The device according to the invention is not limited to what has been described above, but can be adapted to various structures of ponds as required.

The photopolymerizable or thermally polymerizable dental resin used in the present invention is a compound containing a required amount (0.1 to 10%) of a polymerization initiation catalyst and having one or more polymerizable ethylenic double bonds. It consists of one or a mixture of two or more selected from the following, an inorganic or organic filler, and the like. As a photopolymerization initiation catalyst, for example, JP-A-48-4987
No. 5, JP-A-57-203007, JP-A-60-26
No. 002, JP-A-60-149603, JP-A-60-
Any conventionally known initiators described in JP-A-62-275103 and the like can be mentioned.

Further, examples of the thermal polymerization initiation catalyst include any initiator such as a peroxide and an azo compound having a suitable operating temperature range of 4G to 100°C.

As a compound having a polymerizable ethylenic double bond, (meth)acrylic acid alkyl ester (carbon number 1-I
Q), polyalkylene glycol di(meth)acrylate (2 to 20 carbon atoms), ethylene glycol oligomer di(meth)acrylate (2 to 1 Gmer), bisphenol octyl(meth)acrylate, 2.2-bis[p −(
γ-methacryloxyβ-hydrokinepropoxy)phenylcopropane, 2,2-di(4-methacryloxypolyethoxyphenyl)propane (2 ethoxy groups in one molecule)
~10 pieces), monofunctional and polyfunctional (meth)acrylic acid esters such as trimethylolpropane tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, and 2 moles of (meth)acrylate containing a hydroxyl group. Urethane (meth)acrylic acid esters, which are reaction products between
Monomers such as those disclosed in No. 8 are suitable.

In addition, the blending of fillers is important in order to significantly reduce the polymerization shrinkage rate of dental resins, or to actively strengthen and improve the properties of resins. Various materials can be used depending on the required performance of the article. For example, if high hardness and abrasion resistance are desired for the wearable article, inorganic ILTs, such as quartz powder, may be used, and if elasticity is required, polymer powders or plasticizers may be used to provide high tensile strength. If required, it is preferable to incorporate high-strength organic or inorganic fibers.

Furthermore, the photopolymerizable dental resin used in the present invention may contain a viscosity modifier, a coloring agent, a storage stabilizer, a preservative, a fragrance, and the like.

[Effects of the Invention] As described above, the method for manufacturing a dental wearing article according to the present invention requires fewer steps than conventional methods, and therefore reduces polymerization shrinkage of dental resin. Since the polymerization is carried out while compensating for the distortion caused by the polymerization, it is possible to produce a wearable article with excellent compatibility and low cost.

[Example] Example 1 A model for evaluating the suitability of dental fittings was adopted,
Plaster I using a part of it (a watch glass shape with a diameter of 5.5 cm)
Iyn was created and used as a working model. Next, use a pencil to draw parallel lines at 5IIl111 intervals on this working model, apply a mold release agent (GC Acrosep), and apply photopolymerizable dental resin (GC Unifast LC) a little more than the working model. It was arranged in small pieces (2.5 cm in diameter and 2 mm thick). next,
The dental resin was irradiated with light using a dental light irradiator (Translux, manufactured by Kultur Co., Ltd.) equipped with an aluminum cap with a hole of 2 cm in diameter on the tip of the irradiation port. The order of irradiation was to divide the areas into strips divided by the previously drawn pencil lines, starting with the outer edge and leaving the center behind.

The method of irradiation was to slowly move back and forth between the irradiation positions within the band while being careful not to irradiate other parts while irradiating one band, irradiating each area for 60 seconds. After the entire area has been irradiated, the fecalized resin is cut with a circular saw along a line passing through the center of the working model, and the resin is separated from the working model.In order to accelerate the deformation of the resin, The sample was treated at ℃ for 15 minutes and then placed on a working model whose ends had been cut together.

After aligning the cross sections of the resin and the model to their original positions, 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 using a universal projector (Con Co., Ltd. V-12). As a result, the width of the gap at the center was 78 μl.

Comparative example! The same photopolymerizable dental resin was applied to the same working model as in Example 1 by the same operation, and then a light irradiator for dental technology (
The entire resin was irradiated simultaneously (10 minutes) using GCC silabolite. When the width of the gap between the cured resin and the working model was measured by the same operation as in Example 1, it was 1825 μ- at the center.

Example 2 The same operation as in Example 1 was performed, and the same photopolymerizable dental resin was placed on the working model. Spacers slightly higher than the working model were attached to the four corners of the technical light irradiator (Sorisha Alpha Light) test stand. Place the working model on the sample stage, and then set the width of the model to 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 the width A large aluminum plate was placed on top. We used only the lamp in the irradiator that irradiated the sample from above, and after 1 minute of irradiation, we removed it in order from the wide aluminum plate and irradiated it again, repeating the operation until the final result. The light blocking plate was removed and the light was irradiated. The suitability of the resin polymerized sequentially from the outer edge to the center by this method to the working model was measured according to the method of the actual test, and the width of the gap at the center was 62 μm.

Example 3 A turntable driven by a geared motor (12 rpm), a halogen lamp with a mirror (15V, 150W) as a light source, and a portion of the light source where the intensity of the light focused by the mirror is almost the highest. A hole with a diameter of 6mff1 was drilled to allow only light to pass through and block out excess light.The narrowed light beam was guided through the tip fiber, and the position of the light beam was moved from the edge of the turntable to the center. The apparatus shown in FIG.

In the same manner as in Example 1, dental resin was placed on the working model, placed on the turntable, the light source was turned on, and the light irradiation position was moved 1o from the outer edge of the turntable toward the center. After taking a slow measurement over a period of minutes,
The width of the gap at the center was 78 μm.

Example 4 Using the same equipment as in Example 3, a working model filled with dental resin was placed on a turntable in the same manner as in Example 3, and the light irradiation position was irradiated from the center of the sample toward the outer part for 10 minutes. It moved slowly.

The compatibility of the dental article polymerized by this method was 310 μl with a central gap width.

Example 5 A heat shock floor resin (Shofu Du Shofu. F Resin) was prepared into a paste according to the method in the instruction manual, and after it was placed on a working model, the turntable rotation speed was adjusted using the apparatus described in Example 3. Polymerization was carried out at a small rpm (l rpm). The matching accuracy of the polymer obtained by this method was 203 μl in terms of the gap width at the center.

Example 6 An apparatus as shown in FIG. 1 was manufactured in which a roof-shaped light-shielding plate was placed between a sample stage and a halogen lamp, and the sample stage moved slowly. Place a sample filled with dental resin on a working model for the production of human mandibular IS on the sample table.
Move the sample stage slowly over a period of 10 minutes in the right direction as shown in the figure. An injection type impression agent is placed between the polymer obtained by this method and the working model.
After the polymer and model were brought into close contact, the force was released to allow the impression agent to harden. Thereafter, this impression agent was taken out and its thickness was measured to determine the gap between the resin and the model, and the value was 100 μm or less.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an example of the dental article manufacturing apparatus of the present invention, and FIG. 2 is a plan view showing the shape of a light shielding plate used in the apparatus shown in FIG. FIG. 3 is a longitudinal sectional view showing another example of the dental article manufacturing apparatus of the present invention. 1. Equipment chamber 2, light source 3, light shielding plate 4, sample stand 5, rotor with reduction gear 6, threaded rod 8, sample 10, optical fiber output light irradiation unit Patent applicant Rira Co., Ltd. death

Claims (2)

[Claims] (1) A dental wearable article characterized in that a dental wearable article is produced by supplying a polymerizable dental resin onto a working model, and then the polymerizable resin is sequentially polymerized one part at a time to obtain a polymerized cured product. Production 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 a control mechanism for partially sequentially irradiating the polymerizable resin with light or heat from the light source or heat source.