JPH0260642A - Manufactured tray for dentistry - Google Patents

Abstract

PURPOSE:To shorten working hours and to improve the strength of the title tray by using a low temperature thermoplastic resin, which has a prescribed softening point at least for a tray part except a handle and is kept in a solid state in a room temperature, as the main component of the title tray and either inserting or laminating a core body into or on the resin as necessary. CONSTITUTION:A thin plate shaped tray part molded into either an approximate horseshoe shape or an approximate semicircular shape is given, protruding and recessed shapes approximate to those in the mouth cavity jaws of a human organism are given to the upper and lower surfaces of the thin plate shaped tray part as necessary, the handle is given to at least one part of the tray part, at least the tray part except the handle has a softening point in the range of 40-100 deg.C, the low temperature thermoplastic resin, which is kept in the solid state in the room temperature, is used as the main component, and the core body is either inserted into or laminated on the resin as necessary. The low temperature thermoplastic resin is a resin to soften in the temperature of hot water or warm water, namely, in a temperature range 40-100 deg.C, and the resin solidifies and never changes further in the room temperature. The low temperature thermoplastic resin is a lactone resin or a transpolyisoprene resin which is common as a spring material, a wig molding material, etc.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to ready-made dental trays.

More specifically, it is a dental product using at least a part of a low-temperature thermoplastic resin composition having a softening point of 40 to 100°C, specifically a low-temperature thermoplastic resin composition mainly composed of a lactone resin or a transpolyisoprene resin. Regarding ready-made trays.

The low-temperature thermoplastic resin composition used in the ready-made dental tray of the present invention is the same as the resin composition that has been conventionally used for known purposes and is softened at the temperature of hot or hot water and solid at room temperature. be.

Known uses include dental bite recording materials (bite recording materials), objects for single force manipulation, plastic clay, medical casts, splint materials, face masks for radiation irradiation, wig molds, etc.

[Prior Art] Conventionally, ready-made dental trays have generally been made of metal or molded using acrylonitrile-styrene resin, polypropylene resin, or the like. Ready-made dental trays are available in three different sizes: large, medium and small, and are used in the following ways in dental care.

That is, when creating a denture model for a patient with edentulous or edentulous jaws, a dental impression agent such as alginic acid is first applied to the inside of the thin plate-like tray part of a ready-made tray, and then this is applied to the patient. Insert it into your mouth and chew with your upper and lower jaws.

In this way, the uneven shape of the upper surface of the teeth or the detailed surface of the tooth base in the case of an edentulous patient is transferred onto the impression material.

Plaster mixed with water is poured into a surface with the same unevenness as the patient's tooth base and left for a certain period of time to harden, creating a jaw model.

The above is a general usage form of the ready-made dental tray. In addition, there are three types of ready-made dental trays: large, medium and small.
Furthermore, it is common for a total of 6 types to be prepared in one set, each for the upper and lower jaws.

When a ready-made tray is used in the manner described above, there are the following problems.

[Problem to be solved by the invention] The problem is as follows.

First, metal devices have the problem of being expensive and causing patients to feel discomfort in the mouth and jaw.

In this case, either the metal tray is transformed into one, or wax is used to fill in the missing edges of the tray.

Products made of acrylonitrile-styrene resin and polyglopylene resin cannot be transformed.

Just add wax to the edges of the tray. The use of conventional ready-made trays in this way has drawbacks such as time-consuming work and weak strength at deformed or joined areas.

Not only does the applied compound not soften unless the temperature is raised to a certain degree, but the patient may feel hot when applying the softened compound to the patient's mouth and jaw. There is.

In view of this situation, the inventors of the present invention have completed the present invention as a result of intensive studies.

[Structure of the Invention] That is, 1 the present invention has a thin plate-like tray portion formed into a substantially horseshoe shape or a substantially semicircular shape, and a substantially human mouth and jaw can be attached to the upper and lower surfaces of the thin plate-like tray portion as necessary. A low-temperature thermoplastic material having an uneven shape on the inside, having a handle on at least a part of the tray part, at least the tray part other than the handle has a softening point of 40 to 100°C, and is solid at room temperature. A ready-made dental tray that is mainly made of resin and has a core inserted or laminated as necessary.

In the ready-made dental tray of the present invention, [approximately horseshoe-shaped or approximately semicircular] means a shape that approximates the arched tooth row in the human mouth and jaw. It also includes objects that are close to triangles without a closed part.

Furthermore, ``the uneven shape J in the mouth, mouth, and jaw does not mean fine unevenness, but rather a sharply curved state.

Furthermore, "having a handle" includes a "protrusion" that can be held by a dentist, a dental technician, or a patient himself when manipulating the ready-made tray.

The role of the "insert or laminated core body as required" is as follows.

In other words, when the "low-temperature thermoplastic resin" is heated and softened, the core may act as a support to prevent it from dripping before it is placed in the patient's mouth or jaw, depending on the type of resin, blend composition, etc. . Specific examples of the core include ordinary woven or nonwoven fabric made of fibers, plastic net, and the like.

The low-temperature thermoplastic resin used in the ready-made dental tray of the present invention is a resin that softens at the temperature of hot water or hot water, that is, 40 to 100°C, and solidifies at room temperature and does not deform any further.

In other words, 200-3, which has been commonly used
It does not include thermoplastic resins that have been molded at relatively high temperatures of around 00°C.

The low-temperature thermoplastic resin mentioned in the present invention is a lactone resin or transpolyisoprene resin that is publicly known and is already commercially available, and is commonly used as a splint material, a wig molding material, etc., and is used for various purposes. ing.

For example, an object for boosting power operation (Japanese Patent Application Laid-Open No. 6O-240692)
, plastic clay (JP-A-6L-42679),
Examples include medical casts (Japanese Patent Laid-Open No. 58-81042), splint materials, face masks for radiation irradiation, and wig molds (Japanese Patent Laid-open No. 60-215018).

This low-temperature thermoplastic resin is used to add plasticizers, stabilizers, heat transfer materials, and other coloring agents necessary for processing resin materials, or to impart properties that the resin alone does not have as described above. This includes cases where other resins are blended.

The lactone resin, which is one of the low-temperature thermoplastic resins that is the main component in the present invention, will be described.The lactone resin described in the present invention refers to lactone monomers, such as ε-
It is produced by ring-opening polymerization of caprolactone, δ-valerolactone, trimethylcaprolactone, etc. using an initiator, and is a thermoplastic resin that is solid at room temperature but softens when heated.

Among the various lactone monomers mentioned above, ε is the one that is mass-produced.
-Caprolactone is particularly preferred.

The low-temperature thermoplastic resin used in the ready-made dental tray of the present invention is produced by the following method.

These lactone resins range in molecular weight from liquid to solid at room temperature, and are used for various purposes. Preferably, it has a molecular weight of about 100°,000.

If the molecular weight is less than 10,000, it will be liquid or waxy at room temperature and will not meet the purpose of use of the present invention. On the other hand, those having a molecular weight of 100,000 or more do not have a high softening point, but have a high viscosity when melted, making it difficult to accurately transfer the uneven shape of the detailed surface of a tooth or tooth base.

Next, conditions for setting the lactone resin to a grade having the above molecular weight range, that is, the softening point range, will be described.

As mentioned above, the lactone monomer is subjected to ring-opening polymerization in the presence of an initiator and a catalyst, but in order to produce the molecular weight grade resin used in the present invention, the lactone monomer usually contains Trace amount of water, specifically 0
．． About 0.05% is used as an initiator.

In order to set the molecular weight, the molar ratio of the lactone monomer and the initiator is calculated and determined according to the following relational expression.

ex, when manufacturing one with a molecular weight of 40.000, 40.0OO=A+nx (lactone monomer molecule I
k) [where A is the molecular weight of water used as an initiator, n
is the number of moles of lactone monomer added per mole of water] In addition, to measure the molecular weight of the produced lactone resin, measure the hydroxyl value and acid value of the resin and calculate according to the following formula. A molecular weight that serves as a guideline is calculated.

Molecular weight 5B, 11 x 2 x 1000 Hydroxyl value + acid value The molecular weight of the lactone resin having a softening point range of 40 to 100°C as described above is 10.000 to 100.000.
Among them, those of 40.000 to 70.000 are preferred.

There is also a method of determining the molecular weight by determining the relative viscosity as described below.

A molecular weight of 10.000 to 100.000 corresponds to a relative viscosity of 1.15 to 2.28.

Note that the relative viscosity described in the present invention is a value measured using a capillary viscometer (Ubbelohde viscometer). The measurement method is J
It was carried out according to IS K6726. None, toluene concentration 1% as solvent, temperature 27°C plus or minus 0.
The value is measured at 05°C.

The catalyst used when producing a lactone resin with a molecular weight of about 10.000 to 100.000 by ring-opening polymerizing a lactone monomer as described above using a trace amount of moisture, specifically about 0.005% as an initiator, is organotin compounds,
Organic titanium compounds, organic tin halide compounds, etc. are suitable, and among them, it is preferable to use stannous chloride (SnCI2).

The amount of catalyst used is 0.01 to 5.0 relative to the lactone monomer.
00 ppm is preferred.

A method for producing a lactone resin having a molecular weight of about 10.000 to 100.000 for use in the ready-made dental tray of the present invention as described above is disclosed in detail in Japanese Patent Application Laid-open No. 149442/1983.

Further, the lactone resin may be of a single grade, or may be used as a blend of a plurality of different grades.

An example of different grades is a combination of one having a relative viscosity of 1.15 to 1.5 and one having a relative viscosity of 1.5 to 2.28.

The properties of resins made by blending multiple types of different grades are better in terms of bending strength and the like even at the same softening temperature than those of the corresponding single grades.

The lactone resin, which is a low-temperature thermoplastic resin produced as described above, may be used alone, or may be used as a blend with acrylonitrile-styrene resin or other thermoplastic resin.

As the acrylonitrile-styrene resin, there is no problem if a general-purpose grade acrylonitrile-75% acrylonitrile-75% resin produced by emulsion polymerization or suspension polymerization or an equivalent product is used.

Other resins that can be blended include ethylene-vinegar and resins, and thermoplastics other than lactone! There are polyester resins such as Ii.

Next, transpolyisoprene, which is another example of a low-temperature thermoplastic resin, will be explained in detail.

In the ready-made dental tray of the present invention, the low-temperature thermoplastic resin transpolyisoprene used is produced as follows.

That is, it is obtained by polymerizing inbrene monomer using a catalyst consisting of an organoaluminum compound, vanadium trichloride, and a titanium compound.

A suitable reaction temperature is 10 to 100'C, and the reaction may be carried out in a solvent such as benzene.

Further, the isoprene monomer may be copolymerized with a conjugated diene monomer or the like.

Trans polyisoprene resin, which is a low-temperature thermoplastic resin, is available in various grades and used for various purposes, but the material used for the ready-made dental tray of the present invention is at least 85% trans-1,4. contains the body, X
A grade having a crystallinity of 15% to 40% and a Mooney viscosity of 5 to 50 (ML-4,100'C) as measured by line diffraction is desirable. Such a trans-1,
The crystalline melting point of the resin composition containing 4-polyisoprene as a main component is 35 to ioo'c.

Those whose physical properties fall outside the above range do not meet the purpose of use of the present invention.

If the crystallinity exceeds 40%, the viscosity when melted is too high, making it difficult to accurately take tooth impressions.

A method for producing trans-1,4-polyisoprene of the above grade is described, for example, in JP-A-50-122.
586, Japanese Patent Application Laid-Open No. 51-53545, and the like.

Next, the situation when manufacturing the ready-made dental tray of the present invention using the above materials will be described.

The shape is not particularly limited, and is the same as that conventionally used, that is, the main part is a thin plate, the tray part is approximately horseshoe-shaped or approximately semicircular, and at least part of the tray part has a handle. is preferred.

The thin tray portion may have a flat plate shape, but it may also be provided with an uneven state in advance to resemble the shape of an average human's mouth and jaw to some extent.

The sizes of each part are as follows.

That is, when the thin plate-shaped tray portion is approximated to a triangle, each side is 50 to 100 mm, preferably 70 mm.
Equilateral or isosceles is best. As long as it is about 70 mm, one size can accommodate most patients, whereas conventionally three sizes were prepared.

In addition, the thickness of the thin plate-shaped tray part is 1 to 10 mm, including the insert or laminated core as necessary.
Preferably, it is 2 to 5 mm.

If the thickness of the thin tray portion is less than 1 mm, it is not only difficult to accurately form uneven shapes in the mouth and jaw, but also it is difficult to work slowly due to heat capacity.

On the other hand, if the thickness of the thin tray portion is 10 mm or more, the amount of material used increases, resulting in a bulky and high cost.

Furthermore, it takes time to soften due to heat capacity,
It is not preferable because it takes time to solidify after giving the uneven shape.

In terms of operation, it is preferable for the handle to be housed near the apex of the thin plate-like tray when it is approximated to a triangle.

Although the handle part does not have to be made of the same low-temperature thermoplastic resin as the thin plate-shaped tray part, it is usually made of the same material due to the convenience of material preparation and the molding method.

A coextrusion method or the like is applied to insert or laminate the core.

The ready-made trays made in this way can be easily and quickly transformed in areas where the patient no longer feels discomfort, and where the missing areas are heated to the extent that the patient no longer feels the heat. Trays can be adapted.

Next, the working situation when using the ready-made dental tray of the present invention will be described.

A thin plate-shaped part of the ready-made tray with a handle as described above is immersed in hot water to soften it.

The temperature of the hot water for softening is 40-ioo'C, preferably 40-60C.

Next, a portion of this softened material is inserted into the patient's mouth and jaw, and is bitten by the upper and lower teeth or, if there are no teeth, by the tooth base.

After a while, when the thin tray part made of low-temperature thermoplastic resin that had been softened drops to the temperature inside the mouth and jaw, that is, 36 to 37 degrees Celsius, the teeth or, if there are no teeth, the details of the tooth base surface become uneven. It hardens while the shape is roughly transferred.

The resin used may have a coloring agent added thereto.

The amount of colorant used is 1 to 5 parts based on the resin.

Alternatively, a heat transfer material may be used to make it easier to soften.

The reason for using a heat transfer material is to ensure uniform heating during heating.

Suitable heat transfer materials include powders of metals with high thermal conductivity, e.g.
These include aluminum powder, copper powder, etc.

The amount of heat transfer material used may be about the same as the amount of dye or pigment used.

The ready-made trays of the present invention do not need to be prepared in 3 types (large, medium, and small), 1 each for the upper and lower jaws, and 6 types in total, unlike conventional products, and can cover two types (one for the upper jaw and one for the lower jaw).

Claims (7)

[Claims] (1) It has a thin plate-like tray part formed into a substantially horseshoe shape or a substantially semicircular shape, and the top and bottom surfaces of the thin plate-like tray part are provided with an uneven shape similar to that in the mouth and jaw of a human body, as necessary; At least a portion of the tray portion has a handle, at least the tray portion other than the handle has a softening point of 40 to 100°C, and is mainly composed of a low-temperature thermoplastic resin that is solid at room temperature. A ready-made dental tray characterized by having a core inserted or laminated according to the requirements. (2) The ready-made dental tray according to claim (1), wherein the low-temperature thermoplastic resin is a thermoplastic lactone resin composition. (3) The ready-made dental tray according to claim (1), wherein the low-temperature thermoplastic resin is a transpolyisoprene resin. (4) The lactone resin composition has a relative viscosity of 1.15 to 1.5
The ready-made dental tray according to claim 1, which is a blend of a polycaprolactone resin having a molecular weight of 1.5 to 2.28. (5) The ready-made dental tray according to claim (1), wherein the core is a woven fabric or a non-woven fabric. (6) A ready-made dental tray according to claim (1), wherein the core is a plastic net. (7) The ready-made dental tray according to claim (1), wherein the low-temperature thermoplastic lactone resin composition is a blend of a lactone resin and another thermoplastic resin.