JPH0731632A - Dental flask - Google Patents

Abstract

PURPOSE:To enable the making of a denture with excellent compatibility simply and efficiently by a microwave polymerization method using an acrylic resin. CONSTITUTION:A dental flask is made up of a flask upper ring 1 and a flask lower ring 2 and a hollowed part is formed almost in the center of the flask upper ring 1. After the hollowed part is tightened with the upper and lower rings, a fixable lid 3 is attached. Then, a resin injection hole 12 is formed at a frame part of the upper ring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental flask capable of easily producing an acrylic resin denture (acrylic denture) in a short time and with high accuracy.

[0002]

2. Description of the Related Art Acrylic dentures are generally manufactured by filling a dough containing a mixture of an acrylic polymer and a monomer into a plaster molding die made by a conventional method of dentistry, followed by heat polymerization in hot water to heat the resin. There is a wet heat polymerization method for curing, a microwave polymerization method for heating and curing the resin by heating the plaster mold filled with dough with microwave irradiation such as a microwave oven,
Various flasks used for microwave polymerization have also been proposed.

Regarding the flask used for microwave polymerization, for example, JP-A-61-176149 and JP-A-6-76149.
Japanese Patent Laid-Open No. 1-263447 discloses a flask including a fiber-reinforced plastic (FRP) upper lid, a middle ring, and a lower ring. However, it is a method of tightening the upper lid, middle ring and lower ring of the flask with bolts and nuts after inserting the dough between the plaster split molds and repeating the test pressure, so it is not possible to supply the resin that supplements the polymerization shrinkage of the monomer. , The manufactured denture contracts and the fitting accuracy is poor.

Japanese Unexamined Patent Publication (Kokai) No. 63-220861 discloses an injection type flask in which a part of a metal flask is removed so that a gypsum mold in the flask is irradiated with microwaves. However, in this flask, a part where the microwave is shielded by the metal is formed, so that the polymerization becomes non-uniform, the resin is deformed, and the fitting accuracy of the manufactured denture is deteriorated.

Further, Japanese Patent Laid-Open No. 2-124155 discloses an injection type FRP flask as a flask capable of supplying a resin that compensates for polymerization shrinkage and capable of uniform polymerization. However, in this flask, a wax denture made in accordance with the conventional method of dentistry is first embedded in the flask lower ring with gypsum, then the flask upper ring is covered on the flask lower ring, and the secondary investment material is injected from the open part of the flask upper ring. Then, it is used by a method of covering the secondary investment material in a flowing state, compressing it with a clamp or the like, and fixing it while waiting for the secondary investment material to cure. At that time, due to the vibration when injecting the secondary investment material and the pressure from the inside of the flask when compressing with covering the lid, a gap is generated between the flask upper ring and the flask lower ring, and the secondary investment material is It is put in a gap and cured. This secondary investment material can be easily removed by dividing the flask and dewaxing operation in a later process, so when dewaxing is completed and the flasks are combined and the plaster mold for denture molding inside the flask is combined, the flask upper ring and flask lower ring There is a gap between and. Therefore, when the flask is tightened with the attached bolts and nuts, the molding gypsum mold is distorted and the resin leaks from the gypsum mold during resin injection. If the tightening force is increased so that the resin does not leak, the flask and bolts will be damaged. In addition, a removable attachment for resin injection is provided on the mating surface of the upper and lower rings of the flask.This attachment is secured at each primary burial so as not to move due to vibration during secondary burial. However, there is a drawback in that it must be fixed to the bottom wheel of the flask.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a dental flask made of FRP, by which a denture having an acrylic resin floor (acrylic denture) can be easily manufactured in a short time with high accuracy. INDUSTRIAL APPLICABILITY The present invention can improve the drawbacks of the dental flask conventionally proposed by the microwave polymerization method.
Provided is a dental flask.

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, in a dental flask made of an injection-type fiber reinforced plastic for producing a denture having an acrylic resin floor by a microwave polymerization method, the flask is composed of an upper ring and a lower ring. The upper part of the flask is provided with a hollow part for gypsum supply, the hollow part is provided with a lid that can be fixed after tightening the upper ring and the lower ring, and the frame of the upper flask has a resin injection hole. And a dental flask.

In the present invention, since the gypsum supply hollowing portion is provided in the substantially central portion of the flask upper ring and the lid that can be fixed after the upper ring and the lower ring are fastened is provided, the secondary investment material is There is no gap between the flask upper ring and the flask lower ring due to the vibration during the injection or the pressure from the inside of the flask when the container is covered and compressed. Therefore, it is possible to eliminate the difficulty caused by the gap between the upper wheel and the lower wheel through a series of steps. In addition, since the upper and lower flasks are fastened with nothing between them, the upper and lower rings can be securely fixed with a little force.

In a plaster mold for molding a denture, a model that reproduces the oral impression is held on the plaster of the lower flask of the flask, and the artificial teeth of wax denture arranged on the denture are held on the plaster of the lower ring of the flask. In order to make a denture with good fitting accuracy, it is necessary to return the positional relationship between the flask upper ring and the lower ring accurately before molding. In the present invention, since the lid can be fixed to the hollowed-out portion of the flask upper ring after tightening the upper ring and the lower ring of the flask, even if a FRP flask or a bolt is used, It is easy to surely return the positional relationship before molding.

In the present invention, the resin injection hole may be provided in the frame portion of the flask upper ring, and may be provided on the upper surface of the frame portion of the flask upper ring or on the side surface of the frame portion of the flask upper ring. Good. Since the resin injection hole is provided in the frame of the upper ring of the flask, even if the resin injection hole is fixed on the upper surface and the resin is injected from above, the molding die will not be broken, and the resin will be securely applied to every corner of the molding die. Even if the resin injection hole is fixed to the side surface of the frame and the resin is injected, the gypsum integrated with the flask is continuously present to the opposite side of the flask in front of the injection hole. The flask will not break.

Further, in order to compensate the volume shrinkage of the resin due to the polymerization, by polymerizing the acrylic resin from the model surface toward the artificial tooth side while injecting the uncured resin, a denture with good fitting accuracy can be obtained. In the method of making a denture by microwave polymerization, aluminum powder that heats by microwaves is mixed into the model material to create a model, and the microwave is applied from the direction of the flask lower ring where the model is buried, and the temperature of the model is changed. If the temperature is raised above the temperature of other gypsum molds and polymerized from the surface of the model, the matching accuracy will increase. Therefore, the site where the resin is poured into the plaster mold for producing the denture is preferably the flask upper ring on the opposite side of the model surface.

Further, the FRP flask is usually a sheet type
It is produced by molding such as rudening compound (SMC) and bulk molding compound (BMC). However, when molding with BMC, the dimensional accuracy of the flask itself is poor, and there is a risk that the positional relationship of the denture will change. is there. Therefore, in the present invention, in order to prevent the positional relationship of the flask from changing, it is preferable to provide the mating surfaces of the flask upper ring and the lower ring with positioning irregularities in addition to the bolt holes for fastening the flask. As positioning irregularities, holes are drilled by precision processing at two or more corresponding locations on both the upper and lower rings of the flask, and one of them is rapidly heated by a microwave such as a microwave oven. A method of fixing a rod-shaped object made of a material such as hard resin or ceramics is preferable. At that time, the length of the rod-shaped object protruding from the mating surface of the flask may be as long as required for positioning the flask, and is usually 5 m.
m or less, preferably 1 to 3 mm is suitable.

As a positioning method, three tapered tapers are attached to the outer circumference of the mating surfaces of the flask upper ring and the lower ring,
It is also effective to use a method in which the flask upper wheel and the lower wheel can be positioned at one point when tightened. Next, the present invention will be described in detail with reference to the drawings showing an example of the flask of the present invention.

FIG. 1 is a perspective view of a flask showing one embodiment of the present invention. FIG. 2 is a vertical cross section of the flask upper ring in the present invention. FIG. 3 is a bottom view of the flask upper wheel according to the present invention. FIG. 4 is a plan view of the flask lower ring in the present invention. Figure 5
The longitudinal cross-sectional view of the flask lower wheel in the present invention.

In FIG. 1, the flask comprises an FRP flask upper ring 1, an FRP flask lower ring 2, and a lid 3. A resin injection attachment 4 is fixed to the upper frame of the flask upper ring 1, and the attachment is attached. 4 is provided with a resin injection hole 12. The tip of the resin injection hole 12 reaches the recess 13 as shown in FIG. The attachment 4 does not adhere to an acrylic resin, for example, a polyacetator.
Preference is given to using materials such as ethylene, tetrafluoroethylene (Teflon). Although not shown, the resin injection hole 12 may be provided by fixing the resin injection attachment 4 to the side frame portion of the flask upper ring 1.
Further, a cutout portion 7 into which a forceps or the like is inserted at the time of dividing the flask is attached to a lower surface frame portion of the upper flask wheel 1. This greatly facilitates flask division.

The flask upper wheel 1 and the lower wheel 2 are fastened with bolts 5 and nuts 6. The lid 3 is provided with a hole 8 for discharging and overflowing the plaster of the secondary investment material.
Is the gypsum mold when the upper ring 1 and the lower ring 2 of the flask are divided when the lid 3 is fixed and the excess gypsum overflows and hardens. Has an effect of generating an anchor effect that prevents the falling of the steel from the flask upper ring 1. In addition, after injecting the secondary investment material into the lid 3 and tightening the flask upper ring 1 and the lower ring 2 with the bolts 5 and the nuts 6, the screw 15 is cut so that it can be fixed to the flask upper ring 1. is there.

In FIGS. 2 and 3, the flask upper wheel 1 has a recess 13 into which a secondary investment material or the like is inserted from the hollow portion 11.
And a bolt hole 5b and a positioning projection 10 are provided.

In FIGS. 4 and 5, the flask lower ring 2 is provided with a bolt hole 5a, a recess 14 for receiving a plaster of a primary investment material, a denture, etc., and a positioning hole 9.

Next, one example of producing a denture using the flask of the present invention will be described with reference to the drawings. (1) A wax denture is primarily embedded in the recess 14 of the flask lower ring 2 in accordance with a standard dental practice. (2) After applying the gypsum separating material to the primary buried gypsum, align the positioning protrusion 10 of the flask upper ring 1 with the positioning hole 9 of the flask lower ring 2, and place the flask upper ring 1 on the flask lower ring 2. It (3) Insert the bolt 5 into the bolt holes 5a and 5b, and use the wrench or the like to mount the nut 6 on the flask upper ring 1 and the flask lower ring 2
Tighten and to fix both.

(4) The tip of the sprue attached to the wax denture is put into the resin injection hole 12 opened in the recess 13 of the flask upper ring, and the sprue is fixed to the resin injection hole 12 with wax. (5) Place the flask on a vibrator, and pour the ordinary plaster of the secondary investment material from the plaster supply cutout portion 11 of the flask upper ring 1 until the recess 13 of the upper ring 1 is filled. (6) The lid 3 is placed on the plaster supply cutout portion 11 of the flask upper wheel 1, and the screws 3 of the lid 3 and the cutout portion 11 are engaged with each other to fix the lid 3 to the flask upper wheel 1. When fixed, part of the plaster overflows from the holes 8.

(7) After the ordinary plaster of the secondary investment material is hardened, the flask is placed in hot water to soften the wax of the wax denture embedded in the plaster. (8) Remove the flask from the hot water, loosen the bolt 5,
A forceps or the like is inserted into the cutout portion 7 provided in the lower portion of the flask upper ring 1 to divide the flask upper ring 1 and the flask lower ring 2. (9) After the dewaxing and application of the resin separating material to the denture mold according to the standard method of dentistry, the upper flask ring 1 and the lower flask ring 2 are fixed again by tightening them with bolts 5 and nuts 6.

(10) In the resin injection attachment 4,
Attach the resin injection machine containing the acrylic resin dough,
Acrylic resin dough is press-fitted from the resin injection hole 12. (11) After press-fitting the dough, the resin injection hole 12 of the resin injection attachment 4 is closed with a resin screw, a rod or the like (not shown). (12) Next, the flask lower ring 2 is turned up and the flask is put into a microwave oven, and the power is turned on to cure the acrylic resin dough with the heat of microwave. (13) After curing, remove the flask from the microwave oven,
After allowing to cool, the acrylic denture is removed from the flask according to the standard dental practice.

In the series of operations (1) to (13),
There is no gap between the upper flask ring 1 and the lower flask ring 2, and the flask is not broken,
The positional relationship between the flask upper ring 1 and the flask lower ring 2 was able to be accurately returned to the state before molding, positioning was easy, and an acrylic denture having good fitting accuracy was obtained.

[0024]

According to the FRP dental flask of the present invention, an acrylic denture can be easily manufactured in a short time and accurately by using a microwave such as a microwave oven.

[0025]

[Brief description of drawings]

FIG. 1 is a perspective view of a flask showing an embodiment of the present invention.

FIG. 2 is a vertical cross section of the flask upper ring in the present invention.

FIG. 3 is a bottom view of the flask upper ring in the present invention.

FIG. 4 is a plan view of a flask lower ring according to the present invention.

FIG. 5 is a vertical cross-sectional view of a flask lower wheel according to the present invention.

[Explanation of symbols]

 1 Flask Upper Ring 2 Flask Lower Ring 3 Lid 4 Resin Injection Attachment 5 Bolt 6 Nut 7 Notch 8 Hole 9 Positioning Hole 10 Positioning Protrusion 11 Gypsum Supply Hollow Out 12 Resin Injection Hole 13 Recess 14 Recess 15 Screw

Claims (1)

[Claims] 1. A dental flask made of fiber-reinforced plastic of injection type for producing a denture having an acrylic resin floor by a microwave polymerization method, wherein the flask is composed of an upper ring and a lower ring, and the flask upper ring is almost It is characterized in that a gypsum supply hollow portion is provided in the central portion, a lid that can be fixed after tightening the upper ring and the lower ring is provided in the hollow portion, and a resin injection hole is provided in the frame portion of the flask upper ring. Dental flask.