JP2001112790A - Dental wax material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dental wax material restoring an abutment tooth gypsum work model and improving measurement accuracy of a marginal line based on a laser beam in manufacture of a crown prothesis by means of a CAD/CAM system. SOLUTION: A dental wax material consists of a white wax 5 changed into an abutment tooth gypsum working model 1 so as to be built up and a black wax 6. The white wax is charged or built up in a gypsum chipped part formed because of foam, breakage or the like so as to be matched with the shape of an abutment tooth inside the mouth. Because the white wax reflects a laser beam, the abutment tooth gypsum working model provides measurement information equal to that about the abutment tooth inside the mouth. The black wax is applied to the marginal line M outside. Because the black wax absorbs a laser beam, the marginal line as an application boundary is clarified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental wax material used for dental prosthesis work in dentistry.

[0002]

2. Description of the Related Art Recently, CAD / C has been widely used in the field of dentistry.
The design and production of crown prostheses using the AM system have been put to practical use and are being applied to clinical practice. The present inventors have studied CAD / C for manufacturing the crowns of upper and lower premolars and molars provided with an occlusal surface configuration in consideration of the function.
An abutment and an opposing tooth information recording member that is effective when applied to an AM system has been proposed (Japanese Patent Application No. 11-151646). In this application, an abutment tooth working model formed of gypsum is measured using a non-contact type three-dimensional shape measuring device by a laser displacement meter using two position detection sensors, and the obtained abutment is obtained. An invention of cutting a crown with a metal such as titanium based on tooth shape information is disclosed.

[0003]

In the above invention,
If micropores due to air bubbles are formed in the working model made of gypsum or the gypsum is damaged and missing, these surfaces are read as it is as information by laser light irradiation, and the correct abutment tooth form There is a problem that information cannot be obtained. Further, when the margin line of the abutment tooth is unclear, there is a problem that the measurement by the laser beam cannot be performed accurately in this part.

The present invention has been made in view of the above circumstances, and provides a dental wax material capable of accurately measuring the shape of a tooth model, for example, an abutment tooth model.

[0005]

Means for Solving the Problems The present invention (claim 1) provides:
A dental wax material used for at least a part of the illuminated body when the illuminated body such as a tooth model is irradiated with laser light and the form of the illuminated body is measured from reflected light thereof; The material is a material mixed with a light-colored pigment and provided with laser light reflection characteristics. In such a configuration, the wax material given the light-colored color reflects the laser light to an extent sufficient for measurement. This reflected light is detected by an optical sensor, and the form of the tooth model is measured.

[0006] In the present invention (claim 2), the bright pigment is a white pigment or a yellow pigment. In such a configuration, the white wax or the yellow wax is
It has the effect of increasing the laser light reflection efficiency, and can provide reflected light of sufficient intensity for measurement.

In the present invention (claim 3), the wax is paraffin wax, candelilla wax,
It is composed of a mixture of carnauba wax, beeswax or montan wax, or a mixture thereof, with titanium oxide as a white pigment or titanium yellow as a yellow pigment. In such a configuration, the wax has an appropriate degree of plasticity that facilitates construction work using a spatula, a knife, or the like, has thermal solubility, maintains shape during cooling, and improves the reflection efficiency of laser light.

In the present invention (claim 4), the object to be illuminated is an abutment gypsum working model, and the abutment gypsum working model is irradiated with a laser beam, and the reflected light is measured to support the abutment gypsum working model. When recording the form of the abutment, it is used for repairing a gypsum missing part or the like of the abutment gypsum working model. In such a configuration, the wax material is filled in the hole or the plaster breakage site caused by air bubbles or the like in the abutment tooth working model, restored to the same form as the abutment tooth in the patient's mouth, and measured by laser light irradiation. You.

In the present invention (claim 5), an object to be illuminated comprising an abutment gypsum working model is irradiated with a laser beam and its reflected light is measured to record the form of the abutment tooth. A dental wax material used for improving accuracy, wherein the wax material is mixed with a black pigment or a black dye and provided with a laser light absorbing property.
In such a configuration, the black colored wax material has an effect of increasing the absorption efficiency of the laser beam, and has an effect of making the boundary between the gypsum portion and the wax material-attached portion clear. Such a wax material is formed, for example, by coating the gypsum surface outside the margin line of the abutment tooth.
In this way, the laser beam is reflected on the gypsum surface inside the margin line and absorbed by the wax material outside the margin line, so that the margin line can be clearly recognized.

In the present invention (claim 6), the wax is paraffin wax, candelilla wax,
Carnawa wax, beeswax or montan wax or a mixture thereof, wherein the black pigment or black dye is any of aniline black, carbon black or an azo black oil-soluble dye, And a mixture of stearic acid and a fatty acid amide. In such a configuration, the wax material has an appropriate degree of plasticity and shape maintenance that facilitates the building work with a spatula, a knife, and the like,
In addition, the laser light absorption efficiency is improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes an abutment dental plaster working model formed by taking an impression from the mouth of a patient.
The abutment tooth 2 is formed in a frusto-conical shape, and a margin line M is formed at an end of a base portion thereof. 3 is a neighboring tooth. Reference numeral 4 denotes bubbles generated during the production of the working model, which are filled with a light-colored wax, for example, a white wax 5,
The surface is restored to the same surface form as the abutment tooth in the oral cavity. When the working model 1 is damaged and a part of the abutment teeth 2 is missing, a white wax is placed on a spatula, exposed to a flame, melted, and laid on the missing portion to restore the form. As light-colored wax, in addition to white wax,
Yellow wax can be used.

Reference numeral 6 denotes a black wax applied along the outside of the margin line M of the work model 1, and is formed in a belt shape around the entire margin line M. The margin line M is
When viewed from the occlusal surface side, that is, from the direction of laser beam irradiation, it is usually indistinct in many cases, and accurate recognition is difficult. However, by applying black wax 6 to the outer periphery, the line M
Can be clearly determined.

The white wax 5 is produced by mixing titanium oxide, which is a white pigment, with paraffin wax. Paraffin wax can be mixed in the range of 95 to 50% by weight, and titanium oxide can be mixed in the range of 5 to 50% by weight. If the mixing ratio of titanium oxide is less than 5% by weight, the reflection efficiency of the laser beam becomes poor, while if it exceeds 50% by weight, there arises a problem that the plasticity and workability deteriorate. As an example, when the paraffin wax was 90% by weight and the titanium oxide was 10% by weight, a white wax excellent in plasticity, workability and reflection efficiency was obtained. Instead of white wax, yellow wax can be used,
In such a case, it is produced by mixing titanium yellow which is a kind of titanium oxide which is a yellow pigment with paraffin wax. As the wax, besides paraffin wax, candelilla wax, carnauba wax, beeswax or montan wax or a mixture thereof can be used. In addition, a small amount of a black pigment or a black dye (described later) can be added to this white wax in order to suppress irregular reflection of laser light.
Also in this case, there is almost no change in the appearance being white.

The black wax 6 is produced by mixing aniline black, which is a black pigment, stearic acid and a fatty acid amide, which are lubricants, with paraffin wax. The lubricant acts to improve the dispersibility of aniline black. Here, paraffin wax is 40-7
7% by weight, and aniline black is 3 to 10%.
In the range of weight percent, the lubricant can be mixed in the range of 20 to 50 weight percent. When the mixing ratio of aniline black is less than 3% by weight, the absorption efficiency of laser light becomes poor, and when it exceeds 10% by weight, the absorption efficiency of laser light does not change.
Conversely, in order to disperse the aniline black, 50% by weight of a lubricant is required, which causes a problem that the plasticity and workability peculiar to the wax are deteriorated. As an example, when paraffin wax was 58% by weight, aniline black was 4.2% by weight, and lubricant was 37.8% by weight, a black wax excellent in plasticity, workability and absorption efficiency was obtained.

In such a black wax, as the wax, besides paraffin wax, candelilla wax, carnauba wax, beeswax or montan wax or a mixture thereof can be used.
As the black pigment, carbon black can be used instead of aniline black. In addition to black pigments, black dyes such as azo black oil-soluble dyes can be used.

Next, a method of manufacturing a crown using the abutment tooth working model 1 will be described in detail. FIG. 2 shows a member for recording the form of the abutment tooth and the opposing tooth (hereinafter simply referred to as a recording member).
Reference numeral 7 denotes a flat rectangular parallelepiped having a two-layer structure of a first layer 8 and a second layer 9. The first and second layers 8, 9 are:
Heat welded. The size of the recording member 7 is, for example, 30 mm in length, 15 mm in width, and 5 to 6 mm in thickness.
And the thicknesses of the second layers 8 and 9 are each １ ／ of the above thickness.
It is. The first layer 8 comprises 20 to 40% by weight of an ethylene / α-olefin cooligomer having a number average molecular weight of 10,000 to 200,000, 10 to 20% by weight of an ethylene vinyl acetate copolymer, and a number average molecular weight of 70, 00
It is formed by mixing 25 to 35% by weight of borica prolactone, 0 to 100,000, 3 to 15% by weight of a flow regulator, and 10 to 20% by weight of a lubricant.

The second layer 9 has a number average molecular weight of 10,000.
25 to 45% by weight of an ethylene / α-olefin cooligomer of 20 to 30,000, 20 to 30% by weight of an ethylene vinyl acetate copolymer, and a number average molecular weight of 70,000.
000 to 100,000 polycaprolactone in 5
To 15% by weight, 3-15% by weight of a flow regulator,
The lubricant is mixed in the range of 10 to 20% by weight to form a sheet.

In the second layer 9, the amount of polycaprolactone is smaller than in the first layer 2 and is mixed in the range of 5 to 15% by weight. The reason why the amounts of the ethylene-vinyl acetate copolymer and the polycaprolactone are set in the above ranges is to set the melting point of the first layer 8 higher than that of the second layer 9 as described above. That is, as shown in FIG. 3, in a state where the first layer 8 is fixed to the abutment tooth 2, the mating tooth 10 is engaged with the second layer 8, and when the shape of the occlusal surface is obtained, the softened second tooth is formed. A force is applied to the second layer 9 laterally, forward and rearward from the opposing tooth 10, but the first layer 8 does not move even when receiving this force,
This is because it must be securely fixed to the supporting teeth 2. In the actual material, as a result of raising the melting point of the first layer 8 higher than that of the second layer 9, the first layer 8 is formed harder at normal temperature.

The second layer 9 may contain a reflection adjusting pigment, for example, a white pigment such as titanium oxide, aluminum oxide, barium sulfate, calcium carbonate, or zinc oxide powder. In the case of titanium oxide, yellow titanium yellow can be used. This amount is at most about a few percent by weight. The addition amount is adjusted according to the sensitivity of the sensor to the laser reflected light. The addition of such a pigment increases the reflection efficiency when applying laser light to the occlusal surface formed by pressing the opposing tooth against the second layer 9 and measuring the reflected light intensity to obtain information on the occlusal surface shape. Made for However, since the second layer 9 made of the above material is not transparent,
Even when the reflection adjusting pigment is not mixed, the laser light is reflected and measurement is possible.

Next, operations for producing a crown will be described in order. A. In the patient's mouth, an abutment 10 is formed on the premolar or molar to be restored. B. The recording member 7 is heated and softened by being immersed in hot water or exposed to a flame, and the first layer 8 is pressed and fixed to the abutment tooth 10. Thereby, the first layer 8 is deformed along the shape of the abutment tooth 10. C. When the shape of the first layer 8 is fixed by cooling, it is taken out of the oral cavity. D. The second layer 9 is heated and softened. At this time, since the second layer 9 has a lower melting point than the first layer 8, the second layer 9 softens quickly,
Since the layer 8 needs to be in a hardened state, it is desirable to heat the second layer 9 so that heat is concentrated on the second layer 9. E. FIG. As shown in FIG. 3, the recording member 7 is returned into the oral cavity,
With the first layer 8 fixed to the abutment tooth 10, the patient is caused to bite and perform lateral movement and forward and backward movement to record the occlusal surface configuration of the opposing tooth 11 on the second layer 3. F. An impression is obtained according to a conventional method, and a gypsum working model 1 is produced. When air bubbles 4 are generated during the production or when the gypsum is damaged, a white wax 5 is filled or laid to repair. Further, black wax 6 is applied to the outside of the margin line M to clarify the margin line M. G. FIG. The working model 1 is fixed in a CAD / CAM system device in which a measuring device and a processing device are integrated, and first, an adjacent portion of the abutment tooth 2 and both adjacent teeth 3 is measured by a laser displacement meter, and then recorded. The member 7 is fixed to the abutment 2 of the working model 1 and the occlusal surface on the surface of the second layer 9 is measured. This measurement is performed by irradiating a laser beam to the abutment tooth 2 of the working model 1 and the surface of the second layer 9 of the recording member 7 and detecting the reflected light, so that highly accurate measurement is possible. H. The design of the crown configuration is based on the standard crown configuration of a database that contains topological features such as cusps, fissures, and maximum prosperity for each tooth type. The ridge and the contact portion are aligned. Further, the occlusal surface form is corrected based on the data of the recording member 7, and the crown form is automatically designed. I. A cutting tool such as a titanium block and a ball end mill, which serve as a crown material, is mounted on the apparatus, and cutting is performed to produce a crown.

In the above-described embodiment, as a use of the light-colored wax, a restoration material when bubbles are generated in the gypsum model or when the gypsum is damaged has been described. A tooth model, such as a molar, is created using only this method, and the tooth model is fixed in a CAD / CAM system device. The form is read by laser light irradiation in the same manner as described above, and based on this information, a metal such as titanium is formed. Can be cut to produce a crown or the like. According to such a method, a method of manufacturing a crown or the like can be realized instead of casting.

[0022]

According to the present invention (claim 1), the wax material to which a light-colored color is applied reflects the laser light to a sufficient degree for measurement, so that the shape of the irradiation target which is a tooth model is Can be accurately measured, and a highly accurate crown or the like can be manufactured.

According to the present invention (claim 2), since the white wax or the yellow wax increases the reflection efficiency of the laser beam, it is possible to measure the form of the irradiation object with high accuracy.

According to the present invention (claim 3), the wax has appropriate plasticity and heat melting property, so that the work by a technician can be performed in the same manner as the usual work of building and forming a wax. In addition, since it has shape retention during cooling,
There is no fear that this will be deformed in a measurement operation or the like.

According to the present invention (claim 4), since the gypsum lacking portion of the abutment tooth working model is repaired, accurate form measurement of the abutment tooth working model can be performed.

According to the present invention (claim 5), the boundary line with gypsum can be clearly recognized by applying a black wax material to, for example, the abutment tooth margin line portion. Measurement accuracy is improved, and a crown or the like that exactly matches the abutment tooth of the patient can be manufactured.

According to the present invention (claim 6), since the black wax efficiently absorbs the laser beam, a clear margin line can be obtained, and the measurement of the abutment tooth form can be performed accurately. The wax build-up operation can be facilitated by the plasticity and thermal solubility of the wax.

[Brief description of the drawings]

FIG. 1 is a perspective view of a working model for describing an embodiment of the present invention.

FIG. 2 is a perspective view showing an abutment tooth and an opposing tooth form recording member.

FIG. 3 is a cross-sectional view for explaining a use state of the recording member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work model of toothed tooth 2,10 Abutment tooth 3 Neighboring tooth 4 Bubbles 5 White wax 6 Black wax 7 Recording member 8 First layer 9 Second layer 11 Counter tooth M Margin line

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Tomohiro Takanashi 2-15-13 Hongo, Bungo-ku, Tokyo Ochanomizu Wing Building 6F Media Co., Ltd. (72) Inventor Toshihisa Fujiwara 2-chome Nakamachi, Atsugi-shi, Kanagawa No. 6 Nissan Digital Process Co., Ltd. (72) Inventor Masanori Kaiuchi 1-8 Yokokawa Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima F-term (reference) 4C052 LL07 LL08 NN01 NN02 NN04 NN11 NN15 4C059 EE04 EE10

Claims (6)

[Claims] An object to be irradiated, such as a tooth model, is irradiated with laser light, and when measuring the form of the object to be irradiated from the reflected light, a dental wax material used for at least a part of the object to be irradiated. A wax material for dental use, characterized in that the wax material is mixed with a light-colored pigment and has a laser light reflection property. 2. The dental wax material according to claim 1, wherein the light-colored pigment is a white pigment or a yellow pigment. 3. The method according to claim 1, wherein the wax is paraffin wax,
3. The dentistry according to claim 2, comprising a mixture of any one of candelilla wax, carnauba wax, beeswax or montan wax or a mixture thereof and titanium oxide as a white pigment or titanium yellow as a yellow pigment. For wax material. 4. The object to be irradiated is an abutment gypsum working model, and when the abutment gypsum working model is irradiated with laser light and its reflected light is measured to record the form of the abutment tooth, The dental wax material according to any one of claims 1 to 3, which is used for repairing a gypsum missing portion or the like of an abutment tooth plaster working model. 5. A dentist used to improve the measurement accuracy when recording an abutment form by irradiating a laser beam to an irradiation target made of an abutment gypsum working model and measuring the reflected light thereof to record the form of the abutment tooth. A wax material, wherein the wax material comprises:
A dental wax material mixed with a black pigment or a black dye and provided with laser light absorption properties. 6. The wax according to claim 1, wherein the wax is paraffin wax.
Any one of candelilla wax, carnauba wax, beeswax, montan wax or a mixture thereof, wherein the black pigment or black dye is any of aniline black, carbon black or an azo black oil-soluble dye. 6. The dental wax material according to claim 5, wherein a mixture of stearic acid and a fatty acid amide is mixed with these as a lubricant.