JPH01303146A - Dental mushbite method - Google Patents

Abstract

PURPOSE:To prevent the generation of deformation by heat or force or deformation with age during transportation by using a low-temp. thermoplastic resin which has a specific softening point and is solid at a room temp. CONSTITUTION:The low-temp. thermoplastic resin to be used in the dental mushbite method is the resin which softens at the temp. of hot water or warm water, i.e., 40-100 deg.C and solidifies at a room temp. and is no longer deformed at room temp. A lactone resin which is one of the low-temp. thermoplastic resins is preferably of about 10,000-100,000mol.wt. in order to be used for the dental mushbite method. The resin is liquid or waxy at ordinary temp. and is, therefore, not suitable for the purpose of use if the mol.wt. is <10,000. Conversely, the resin having >=100,000mol.wt. has a high viscosity at the time of melting and the exact transfer of the mold of the rugged shape for the detailed part of the surface of the tooth bed is difficult with such resin. The lactone resins may also be used by blending plural kinds of different grades. The characteristics of the resin formed by blending plural kinds of the different grades have the better bending strength, etc., even if the softening temp. thereof is the same as the softening temp. of the resin of the single grade.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a dental bite registration method.

More specifically, the present invention relates to a dental bite registration method using a low-temperature thermoplastic resin having a softening point of 40 to 100° C., specifically, a low-temperature thermoplastic resin whose main component is a lactone resin or a transpolyisoprene resin.

The low-temperature thermoplastic resin used in the dental bite registration method of the present invention includes conventionally known dental bite recording materials (bite registration materials), paraffin wax and bite wax as waxing agents for dentures.

Thermoplastic waxes such as utility waxes,
It can be used in the same way as silicones, which are instant-curing resins, such as silicone materials for bite registration and silicone materials for impressions.

[Prior art] The main purpose of performing bite recording work using bite recording materials made of the above-mentioned materials is to measure the positional relationship between the upper and lower jaw models created after taking impressions from inside the patient's mouth. The goal is to accurately and quickly reproduce the movement on an articulator (a machine that reproduces jaw movements).

After completing this operation, the diagnosis 2 prosthesis is created.

Manufactures treatment equipment, etc.

There are three general methods of using occlusal recording materials:

The first method is to record the state of contact between the upper and lower teeth in dentate animals using wax with a thickness of 3 to 4 mm or less (usually 2 mm). "make it work."

Among the conventionally used materials mentioned above, silicone materials are mainly used for this purpose.

This is then used to diagnose the state of contact between upper and lower teeth (occlusal diagnosis), as well as inlays and onlays.

Used for making onlays, crown 7 bridges, permanent tooth fixation devices, etc.

The second type is ``a device with a thickness of about 1 to 20 mm that is used to record the state before tooth contact in toothed animals.''

This is then used to diagnose the development of mouthbite and to make ear correction devices.

The third type is ``used as a ridge or mass to determine the occlusal height in missing teeth and edentulous jaws.''

This is then used to make complete and partial dentures.

In the second and third applications, silicone materials are not used.

When the above-mentioned materials are used for the above-mentioned purposes.

It has the following drawbacks.

[The problem that the invention attempts to solve] The problem is as follows.

As mentioned above, silicone materials have limited uses.

Waxes are mainly used because of their poor operability.

However, after curing, waxes have a hardness greater than that of windows (
It is difficult to obtain a shape that does not deform by touching it lightly with your fingernail, and it may deform after one operation.

Furthermore, the occlusal recording material is often transported to a dental laboratory after the occlusal record has been completed together with the upper and lower jaw models.

The problem here is that during transportation, deformation occurs due to heat or force, and deformation occurs over time.

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

[Constitution of the Invention (2) The present invention is ``a dental bite registration method characterized by using a low-temperature thermoplastic resin having a softening point of 40 to 100°C and solid at room temperature.''

The low-temperature thermoplastic resin used in the dental bite registration method of the present invention refers to the temperature of hot water or hot water, that is, 40 to 10"C.
It is a resin that softens at room temperature, but 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 are molded at relatively high temperatures of about 0.00"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 Application Laid-Open No. 58-81042), splint materials, face masks for radiation irradiation, and wig molds (Japanese Patent Application Laid-open No. 60-21501.8).

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 dental bite registration method of the present invention is manufactured by the following method.

These lactone resins have various molecular weights, ranging from those that are liquid at room temperature to those that are solid, and are used for various purposes. Those having a molecular weight of about 100°,000 are preferred.

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, 40.000 = A + nx (molecular weight of lactone monomer) [However, 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. As a guideline, the molecular weight can be calculated.

56.11 x2 xlooo The molecular weight of the lactone resin having a softening point range of 40 to 100°C as described above is 10, OOO 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.

In addition, the relative viscosity described in the present invention is a value measured using a capillary viscometer (Ubbelohde viscometer), a! It was carried out according to the standard method JIS K 6726. However, the value was measured at a concentration of toluene as a solvent of 1% and a temperature of 27°C plus or minus 0.05°C.

Lactone monomer with trace amount of water, specifically 0°05%
Catalysts used when producing a lactone resin with a molecular weight of about 10.000 to 100.000 by ring-opening polymerization as described above using an initiator of about Among these, it is preferable to use stannous chloride (SnC12).

The amount of catalyst used is 0°1 to 5% relative to the lactone monomer.
OOOppm is preferred.

The molecular weight used in the present invention as described above is 10.000 to 10.
A method for producing a lactone resin of about 0.000 is disclosed in detail in JP-A-56-149442 and other publications.

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 resins and polyester resins that are thermoplastic resins other than lactones.

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

In the present invention, transpolyisoprene, which is a low-temperature thermoplastic resin used, is produced as follows.

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

The temperature of the reaction is suitably 10 to 100°C, and the reaction may be carried out in a solvent such as benzene.

Further, other conjugated diene monomers may be copolymerized with the imprene monomer.

Trans-polyisoprene resin, which is a low-temperature thermoplastic resin, has various grades and is used for various purposes, but the material used for dental occlusal registration of the present invention is at least 85% trans-1, Such trans-1 is desirably of a grade containing 15% to 40% crystallinity as measured by X-ray diffraction and a Mooney viscosity of 5 to 50 (ML-4, 100°C). The crystal melting point of the resin composition mainly composed of ,4-polyisoprene is 35
~100°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 in which the dental bite registration of the present invention is performed using the above-mentioned materials will be described.

The shape is not particularly limited, but it may be one that has been conventionally used, that is, a rectangular shape with a length of about 10 cm, a width of about 2 cm, and a thickness of about 1 to 5 mm, or a shape in the mouth and jaw with approximately the same thickness. It is best to have them molded together into a saddle-shaped plate.

The above-mentioned plastic materials are usually already commercially available as pellets, which are molded into a sheet by extrusion, and then punched out into the desired shape using a press machine. is one method.

Another method is to mold resin pellets using an injection molding machine equipped with a predetermined mold.

Furthermore, if the resin pellets molded into strips or saddle-shaped plates are not available as described above, they may be obtained as resin pellets and molded at the treatment site.

Next, the working situation in the dental occlusal registration method of the present invention will be described.

A strip or saddle-shaped plate as described above is immersed in warm water to soften it.

The temperature of the hot water for softening is 40 to 100°C, preferably 40 to 60°C.

It may be difficult to create a grade of resin that softens when the hot water temperature is 40°C, but as is clear from the purpose of use, due to the temperature difference between the temperature of the human body and 36-37°C. I can not use it.

Next, this softened product is inserted into the patient's mouth and jaw, and is bitten with the upper and lower teeth or the tooth base if there are no teeth.

After a while, when the temperature of the bite recording material, which has not softened until then, drops to the temperature inside the mouth and jaw, that is, 36 to 37 degrees Celsius, it hardens while still transferring the uneven shape of the teeth or the details of the tooth base surface if there are no teeth. .

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.

Claims (4)

[Claims] (1) A dental occlusal registration method characterized by using a low-temperature thermoplastic resin that has a softening point of 40 to 100°C and is solid at room temperature. (2) The dental bite registration method according to claim (1), wherein the low-temperature thermoplastic resin is a thermoplastic lactone resin composition. (3) The dental bite registration method 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 dental occlusal registration method according to claim (1), which is a blend of a polycaprolactone resin having a molecular weight of 1.5 to 2.28.