JPH0472546B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing a denture base and an apparatus for manufacturing dentures used in dental treatment, and in particular to complete dentures, local dentures, etc. The present invention relates to a method and apparatus for manufacturing a denture that is in direct contact with the oral mucosa of the patient.

(Conventional technology) Conventionally, in dental treatment, partial
Alternatively, complete dentures, local dentures, BACKGROUND OF THE INVENTION Dentures such as floor dentures that are in direct contact with the oral mucosa are manufactured.

In general, these dentures are manufactured by kneading and filling a plaster mold made with an impression mold with thermosetting resin, and then placing it in hot water boiling at 100℃ for 1 to 3 hours.
This is done by polymerizing and curing for 2 hours to create a denture base, and then implanting artificial teeth into this denture base.

(Problems to be Solved by the Invention) However, although the denture base of the denture manufactured in this way is polymerized by placing it in boiling water at 100°C,
At that time, the internal temperature rises to about 120°C due to polymerization heat and hardens. Therefore, if you take it out of the hot water after curing and lower the temperature to about room temperature,
Due to the temperature difference, thermal contraction occurs in the denture base,
Especially in the denture base of a complete denture, the palate (upper jaw)
Alternatively, the part that contacts the tongue (tongue jaw) is thinner than the part that contacts the gums, so the entire denture base is pulled by the thicker part that contacts the gums, causing the entire denture base to curve. .

Therefore, the palate (maxilla) or the tongue (lingual jaw)
The part of the denture base that touches the palate (upper jaw) of the oral cavity
Alternatively, the entire surface of the tongue (tongue jaw) cannot be brought into close contact, creating a raised part, making it easy for air to get into this gap, and therefore, such denture bases often peel off and fall within the wearer's mouth. A situation occurs.

Furthermore, the work of removing the denture base, which has been cured by heating and polymerizing, from the plaster mold is extremely difficult because contraction occurs when the temperature of the cured resin cools down to room temperature, and the cured resin adheres even more closely to the plaster mold. It will be a lot of work.

(Means for Solving the Problems) The present invention has been made in view of the above points, and consists of a first step of covering the jaw model with a photocurable resin layer, and then a soft transparent layer with good elasticity. A second step of covering and sealing with a transparent film, the interface between the jaw model and the photocurable resin layer formed in the first and second steps, and the interface between the photocurable resin layer and the elastic soft transparent film. A third step of suctioning and eliminating the gas present at the interface, and a fourth step of irradiating the photocurable resin with light from the outside of the flexible, transparent film while applying rotation to the third step. By carrying out all of the above steps, the photocurable resin layer is pressed and adhered to the jaw model surface using the light-transmitting film under atmospheric pressure, and the photocurable resin is polymerized and cured on the jaw model while making a mold. A method for manufacturing a denture base, comprising: a light irradiation device for curing a photocurable resin layer; a jaw model for coating the photocurable resin layer; and a method for further coating the photocurable resin layer. A soft translucent film with good elasticity for
A means for rotating the light-transmitting film and the jaw model together, and sucking and removing gas present at the interface between the jaw model and the photocurable resin layer and the interface between the photocurable resin layer and the light-transparent film. 1. A denture base manufacturing apparatus, characterized in that it is comprised of means for.

(Example) An example of the method for manufacturing a denture base of the present invention and the apparatus used therein will be described based on the drawings.

FIG. 1 is a longitudinal sectional view of the denture base manufacturing apparatus of the present invention, and FIGS. 2 to 10 are explanatory diagrams of each manufacturing process for manufacturing the denture base of the present invention to produce a denture with a denture. be.

First, an example of the method for manufacturing a denture with a denture manufactured using the denture base of the present invention will be specifically described below, and the process of manufacturing a jaw model suitable for use in the present invention will be explained before and after. do.

Manufacturing process of a rough jaw model using impression material: Knead the impression material 1, place it on a ready-made tray 2, and press it against the upper jaw and/or lower jaw 3 in the oral cavity to make an approximate impression of the upper jaw and/or lower jaw 3. take. As a result, a general jaw model (concave shape) 4, a so-called marumo, is formed using the impression material 1 that fits the upper jaw and/or the lower jaw 3 (see FIG. 2).

Manufacturing process of a rough jaw model made of plaster material: Based on the rough jaw model 1 made of impression material manufactured in the above process, plaster slurry is poured into it and hardened to form a rough jaw model (convex shape) 6 made of plaster material. (See Figure 3).

Manufacturing process for each individual tray: In the above process, a paste-like photocurable resin layer 7 is placed on the rough jaw model (convex shape) 6 made of plaster material, and after being pressed with a finger to roughly blend it, as described below. The photocurable resin 7 is cured by irradiating light from an upper light source 8 according to the curing apparatus and curing method shown in FIG. 1, which will be described in detail below. In this way, a tray 9 (concave type) that approximately matches the upper jaw and/or lower jaw 3 of each individual is made (see FIG. 4).

Manufacturing process of a precise concave jaw model: Place the impression material 1 on each tray 9 manufactured in the above process and press it against the upper and/or lower jaw 3 in the oral cavity to take a precise impression of the jaw 3. A concave jaw model 10 is made. (See Figure 5).

Manufacturing process of precise convex jaw model: Precise concave jaw model 10 manufactured in the above process
Then, plaster slurry is again poured and hardened to create a precise jaw model 11 (convex) (see Figure 6).

Adjustment process using articulator: Precise jaw model 11 (convex type) manufactured in the above process
is placed in the articulator, the occlusal condition is predicted when artificial teeth are implanted in the upper and lower jaws 3, the height and other values are measured, and the occlusal condition of the precise jaw model 11 (convex type) is adjusted. .

[First step of manufacturing the denture base of the present invention] Precise jaw model 11 (convex shape) adjusted in the above step
is removed from the articulator and placed on the rotary plate 12 of the curing device shown in FIG. After applying light pressure with a finger to roughly blend it and stretching it to a substantially uniform thickness, excess photocurable resin 7 is removed.

[Second Step] Then, the upper end portion 1 of the peripheral wall 13 of the rotating plate 12
A soft transparent rubber sheet 14 with good elasticity is attached to 3a.
The rubber sheet 14 is tightly fixed to the outer periphery of the peripheral wall 13 of the rotary plate 12 by covering the rubber sheet 14 with a ring 16 from the upper end 13a of the peripheral wall 13 (see FIG. 7).

[Third Step] Next, as shown in FIG. 8, the rotating plate 12 is formed by covering the rotating plate 12 with the soft transparent rubber sheet 14 having good elasticity, and the rubber sheet 14 covers the rotating plate 12. The air in the space 15 is passed through the vacuum rubber pipe 3 through the suction hole 17 bored in the lower part of the rotary plate 12.
The interface 11a between the jaw model and the photocurable resin layer and the interface 14a between the photocurable resin layer and the elastic soft translucent rubber sheet are
The gas present is sucked out. By doing so, the seven layers of photocurable resin are brought into close contact with the precise jaw model 11 from above using the rubber sheet 14.

The jaw model is made of plaster, which is a finely porous material, but a large number of pores were artificially drilled into it.
It is desirable to improve the air permeability, that is, the ability to suction and eliminate the gas.

[Fourth Step] Furthermore, while maintaining the suction and depressurized state, a belt 22 stretched between a pulley 18 pivoted below the rotary plate 12 and a pulley 21 of the output shaft 20 of the motor 19 is used. Then, the jaw model is rotated at low speed. Then, intermittent light is irradiated by a flashlight 8 equipped with a reflecting plate 24 suspended from a top plate 23 above the rotary plate 12, and the photocurable resin is closely attached to the precise jaw model 11. Layer 7 is cured. In this case, bubbles generated from within the photocurable resin layer during light irradiation are constantly sucked and exhausted, so they do not remain, and the photocurable resin layer maintains a state in close contact with the jaw model. Note that the light irradiation time is usually about 15 to 20 seconds.

Next, air is introduced into the depressurized part on the rotary plate 12 to return the rubber sheet 14 to its original state,
After removing the ring 16 and the rubber sheet 14, a precise jaw model 11 with the photocured resin layer 7 in close contact with it.
is removed from the rotating plate 12.

As described above, the denture base of the present invention is completed on the jaw model 11, but in order to manufacture a complete denture or a local denture, artificial teeth are implanted onto the denture base.

Artificial tooth implantation process: The precise jaw model 11 to which the photocured resin layer 7 is in close contact is again set in the articulator, and the cured resin layer 7 is placed in the articulator.
An artificial tooth 27 made of ceramic or the like is pasted and temporarily attached to the bulging part 26 corresponding to the gum part using a photocurable resin 7a. Move the rubber sheet 1 into the curing device again.
The artificial tooth 27 is fixed to the denture base protrusion by irradiating light while rotating on the rotary plate 12 without covering the artificial tooth 27 (see FIG. 9).

Gum region formation step: In order to completely and firmly adhere the artificial tooth 27 to the denture base of the cured resin layer 7 to which the artificial tooth 27 is temporarily attached, and at the same time complete the gum region, uncured light is applied to the peripheral region of the artificial tooth 27. After the curable resin 7b is applied with a finger to form a gum region, it is again photocured in the curing device in the same manner as in the artificial tooth implantation process (see FIG. 10).

Material: As the photocurable resin used in the present invention, known photocurable resins such as the ethylenically unsaturated polymeric substance described in JP-A-57-203007 can be used.

Note that these known photocurable resins contain a photosensitizer, a polymerization initiator, a catalyst, a filler, and the like.

Such a photocurable resin is usually stored in a light-shielding black bag, and visible light having a wavelength of 500 nm can generally be used as the irradiation light for photocuring. A xenon lamp, a photography strobe light, a halogen lamp, or the like is used as a light source that emits these light rays.

Hardening device: Examples of the denture base manufacturing device of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal sectional view of a denture base manufacturing apparatus of the present invention for manufacturing dentures.

Reference numeral 8 designates a xenon lamp protruding inside a curved reflector 24 that hangs down from the top plate 23 of the housing 30. A rotating plate 12 is provided directly below the xenon lamp 8, and a xenon lamp 8 is provided on the center of the plate 12. A precise jaw model 11 made of plaster is placed, and the jaw model 11 is coated with a pasty uncured curable resin layer 7.

A soft rubber sheet 14 is placed on the upper end 13a of the peripheral wall 13 of the rotary plate 12 to enclose the jaw model 11 and the photocurable resin layer 7, and a ring 16 is fitted from the upper end 13a of the peripheral wall 13. Then, the rubber sheet 14 is brought into close contact with the outer periphery of the peripheral wall 13 of the rotating plate 12.

A vacuum pump 31 is installed at the center of the bottom of the rotary plate 12.
A suction hole 32 is drilled therein. The suction hole 32 of the rotating plate 12 is formed by a suction pipe 33, and the rotating plate 12 is pivotally attached to a rotating shaft 34, and a pulley 18 is pivotally attached to the other end of the rotating shaft 34. .

Therefore, the rotating plate 12 is connected to the pulley 2 of the output shaft 20 of the motor 19 which is horizontal to the pulley 18.
1 and is rotated by a belt 22 stretched between the two.

The purpose of rotating the rotating plate 12 is to prevent the unevenness of light irradiation, so the rotation speed should be at a level that does not cause shadows depending on the irradiation angle of the light source, and there is no need to rotate it too quickly. There is no gender.

Since the device according to the embodiment of the present invention uses a light source with a large amount of light, such as a strobe light, it is housed in a housing 30 to prevent light from leaking to the outside.When necessary for operation, the device can be rotated by pulling the handle 35. plate 1
2, rotating shaft 34, absorption pipe 33, motor 1
9. A drawer section 36 housing the pulleys 18, 21, etc. can be pulled out along a guide rail 37.

The jaw model is made of plaster, which is a finely porous material, but a large number of pores were artificially drilled into it.
It is desirable to have good ventilation, that is, the ability to suck and remove the gas, and a fan 38 is attached to the casing 30 to prevent the temperature inside the casing 30 from rising.

Also, the suction pipe 3 forming the suction hole 38
3 is fitted with one end 39a of a vacuum rubber pipe, and the other end 39b of the vacuum rubber pipe is fitted with a suction nozzle 40 inserted through the housing 30. Therefore, in order to eliminate the air in the space 15 between the rotating plate 12 and the rubber sheet 14, the suction nozzle 40 is connected to the suction hole 41 of the vacuum pump 31.
All you have to do is connect it. Furthermore, the upper part 4 of the main housing 30
2 is equipped with an electric control section and controls this device.

(Effects of the Invention) As described above in detail in the examples and the like, according to the present invention, the photocurable resin layer is precisely pressed and adhered to the jaw model surface without forming any voids, and is exposed to light as it is. Because it is hardened, a denture base is manufactured with a very accurate impression of the jaw model surface.
In addition, the manufactured denture base does not require high temperatures to mold and harden, and therefore does not shrink even after hardening, making it possible to precisely copy the shape of the jaw, and even if there is a partial deviation in the thickness of the denture. The floor does not curve. Therefore, when the denture base manufactured according to the present invention is attached to the upper or lower jaw in the oral cavity, it will fit accurately to the upper or lower jaw without creating a gap, and therefore the denture base will not loosen during installation. There is no chance that something like falling will happen.

In addition, when the photocurable resin layer is irradiated with light, bubbles may be generated from within the photocurable resin, but in the present invention, bubbles are forcibly removed by suction, so they do not accumulate. Therefore, the photocurable resin will not become cloudy or deformed due to the bubbles. Since the resulting denture base does not shrink even after hardening, it is extremely easy to remove from the plaster jaw model.

Furthermore, the curing time is less than 1 minute, and compared to the conventional method of curing in boiling water for 1 to 2 hours, the denture can be completed on the spot without making the patient wait during treatment. Since the device can be attached to the patient, treatment time can be significantly shortened.

As described above, the present invention exhibits excellent functions and effects that have never been seen before, and makes a very large contribution to this field.

[Brief explanation of drawings]

FIG. 1 shows a longitudinal cross-sectional view of an embodiment of the denture base manufacturing apparatus of the present invention, and FIGS. FIG. 3 represents a cross-sectional view of a denture base etc. in each manufacturing process. 1: impression material, 2: ready-made tray, 3: upper jaw, lower jaw, 4: approximate jaw model (impression material), 6: approximate jaw model (gypsum), 7, 7a, 7b: photocurable resin,
8: Light source, 9: Individual tray, 10: Precise jaw model (concave), 11: Precise jaw model (convex), 11a:
Interface between jaw model and photocurable resin layer, 12: Rotating plate, 14: Soft translucent rubber sheet, 14a: Interface between photocurable resin layer and soft translucent rubber sheet, 1
5: Space, 16: Ring, 17: Suction hole, 1
8, 21: pulley, 19: motor, 22: belt, 24: reflector, 26: bulge, 27: artificial tooth, 30: housing, 31: vacuum pump, 32: suction hole, 33: suction pipe, 34: Rotation shaft, 40: Suction nozzle.

Claims (1)

[Scope of Claims] 1. A first step of covering the jaw model with a photocurable resin layer, a second step of covering and sealing the jaw model with a soft transparent film with good elasticity, and the first and second steps. a third step of suctioning and eliminating gas present at the interface between the jaw model and the photocurable resin layer formed by the method and the interface between the photocurable resin layer and the elastic soft transparent film; By performing all of the above steps, including the fourth step of irradiating light onto the photocurable resin from the outside of the elastic soft transparent film while applying rotation to A method for manufacturing a denture base, which comprises polymerizing and curing the photocurable resin on the jaw model while taking a mold by pressing the photocurable resin layer into close contact with the jaw model surface using a film. 2. A light irradiation device for curing the photocurable resin layer, a jaw model for covering the photocurable resin layer, and a soft translucent material with good elasticity for further covering the photocurable resin layer. a film, a means for rotating the light-transmitting film and the jaw model together, and a gas interposed at the interface between the jaw model and the photocurable resin layer and the interface between the photocurable resin layer and the light-transparent film. A device for producing a denture base, comprising: means for suctioning and removing the denture base.