WO2015059761A1

WO2015059761A1 - Dental abutment and dental resin material

Info

Publication number: WO2015059761A1
Application number: PCT/JP2013/078530
Authority: WO
Inventors: 浩史安藤
Original assignee: 株式会社ユニックスジャパン
Priority date: 2013-10-22
Filing date: 2013-10-22
Publication date: 2015-04-30

Abstract

A dental abutment comprising an insertion fixing part (3a) that is to be inserted into a root canal (2a) of a remaining natural tooth and fixed therein and a support part (3b) that is formed continuously to the insertion fixing part (3a) so as to protrude toward the crown side from an opening (2c) of the root canal (2a) and thus supports an artificial tooth part (an artificial first premolar (4)), wherein the insertion fixing part (3a) and the support part (3b) are formed integrally of a resin that contains 50 wt% or more of a polyolefin resin as a main component. Thus, provided are a dental abutment and a dental resin material which are reduced in an allergy risk, have a high elasticity and are hardly damaged during long time use.

Description

Dental abutment and dental resin material

The present invention relates to a dental abutment and a dental resin material.

As one of the dental treatments, the dental pulp is removed from the root canal after resection of the crown, and an abutment (core) is built on the hollow root canal. Patent Document 1 discloses a method of repairing a prosthesis by covering a coronal prosthesis.

JP 2004-65579 A

However, the material constituting the abutment is not disclosed. Therefore, if the abutment is made of conventional metal, the metal component may melt and cause metal allergy. Further, if it is made of metal, it lacks elasticity, and it becomes difficult to insert the abutment to the depth of the root canal, and the abutment is broken when it is forcibly inserted into the root canal while the fixing strength of the abutment is insufficient. Furthermore, there is a possibility that teeth (for example, portions other than the abutment) may be broken (broken) by long-term use of the abutment.

An object of the present invention is to provide a dental abutment and a dental resin material that are less likely to cause allergies, have elasticity, increase the strength of fixing to the root canal, and are less likely to be damaged even when used for a long period of time. It is to provide.

Means for Solving the Problems and Effects of the Invention

The dental abutment of the present invention is formed continuously from an insertion fixing part that is inserted into and fixed to the root canal of the remaining natural tooth, and from the insertion fixing part so as to protrude from the opening of the root canal to the crown side. And a support part that supports the artificial tooth part, and the insertion fixing part and the support part are formed of an integrally molded product of a resin having a polyolefin resin as a main component of 50% by weight or more. This reduces the possibility of allergies due to the characteristics of the resin that is mainly composed of polyolefin resin, and because it has moderate elasticity, it is easy to insert deep into the root canal, increasing the fixing strength. A dental abutment that is less likely to break even when used is realized.

The dental resin material of the present invention is a resin material used for producing a dental abutment used in the oral cavity, and is 65 to 90% by weight of polypropylene and 7 to 7% of polyethylene or ethylene α-olefin copolymer. A copolymerized polypropylene resin material containing 25% by weight, magnesium stearate 0.01-2% by weight, one or both of titanium oxide and iron oxide 0.001-1% by weight, and a pigment 0.0001-1% by weight. It is characterized by being a main component. Accordingly, a dental abutment having a low possibility of allergy, moderate hardness, and being less likely to break is realized by the characteristics of polypropylene with an appropriate blending ratio and the like.

The dental resin material of the present invention is a resin material used for producing a dental abutment used in the oral cavity, comprising 75 to 85% by weight of polypropylene, polyethylene or ethylene α-olefin copolymer. 15 to 20% by weight, magnesium stearate 0.03 to 0.5% by weight, one or both of titanium oxide and iron oxide 0.003 to 0.1% by weight, and pigment 0.001 to 0.1% by weight % Of copolymer polypropylene resin material as a main component. Accordingly, a dental abutment having a low possibility of allergy, moderate hardness, and being less likely to break is realized by the characteristics of polypropylene with an appropriate blending ratio and the like. In the above, the hardness may mean having a minute elasticity.

The schematic cross section which shows typically the structure of the tooth | gear (2nd premolar, 1st premolar, canine) in the mouth. FIG. 1B is a schematic cross-sectional view showing a state in which the dental pulp of the first premolar of FIG. 1A is excised and the pulp is removed. 1 is a schematic perspective view showing an example of a dental abutment of Example 1. FIG. The model perspective view which shows an example of an artificial tooth. The model perspective view which shows the state which turned the artificial tooth of FIG. 3A upside down. The model perspective view which shows the state which inserted the dental abutment of FIG. 2 in the hole part of the artificial tooth of FIG. 3A. 4A is a schematic bottom view showing the magnitude relationship between the size of the hole portion of the artificial tooth and the support portion of the dental abutment (the insertion fixing portion of the dental abutment is omitted). 4A is a schematic cross-sectional view showing the magnitude relationship between the depth of the hole portion of the artificial tooth and the height of the support portion of the dental abutment in the state of FIG. 4A. The schematic cross section which shows the scene which filled the root canal of FIG. 1B with the apical filler. FIG. 5B is a schematic cross-sectional view showing a scene where the dental abutment (first) of FIG. 2 is inserted into one root canal of FIG. 5A. FIG. 5B is a schematic cross-sectional view showing a scene where the dental abutment (second) in FIG. 2 is inserted into the other root canal following FIG. 5B. FIG. 5C is a schematic cross-sectional view showing a scene in which an artificial tooth having a hole filled with an ultraviolet curable resin is mounted on a dental abutment, following FIG. 5C. FIG. 5D is a schematic cross-sectional view showing a scene in which the ultraviolet curable resin is cured by irradiating ultraviolet rays after FIG. 5D. FIG. 5E is a schematic cross-sectional view showing a scene in which the dental abutment and the artificial tooth integrated with the cured ultraviolet curing resin are separated from the patient's root canal, following FIG. 5E. FIG. 5F is a schematic cross-sectional view showing a scene in which dental cement is applied to the insertion fixing portion of the separated dental abutment and the patient's root canal and the root canal and the dental abutment are joined together, following FIG. 5F. The model perspective view which shows the scene which filled the hole part of the artificial tooth of FIG. 3B with the ultraviolet curing resin. The model perspective view which shows the scene which injected the dental cement into the artificial tooth of FIG. 5F. FIG. 3 is a schematic cross-sectional view showing a state where a root canal is prosthetic-restored using the dental abutment of FIG. 2. FIG. 3 is a schematic cross-sectional view showing a state in which a root canal has three prosthetic restorations using the dental abutment of FIG. 2. The model perspective view which shows the modification 1 of the dental abutment of FIG. The model perspective view which shows the modification 2 of the dental abutment of FIG. The model perspective view which shows the modification 3 of the dental abutment of FIG. The model perspective view which shows the modification 4 of the dental abutment of FIG. The model perspective view which shows the modification 5 of the dental abutment of FIG. The schematic cross section which shows the state which carried out the prosthetic restoration of the tooth | gear using the several dental abutment. FIG. 6 is a schematic perspective view showing an example of a dental abutment of Example 2. FIG. 10B is a schematic cross-sectional view showing a state where a tooth is prosthetic-restored using the dental abutment of FIG. 10A. FIG. 10B is a schematic perspective view showing Modification 1 of the dental abutment of FIG. 10A. FIG. 11B is a schematic cross-sectional view showing a state where a tooth is prosthetic-restored using the dental abutment of FIG. 11A. FIG. 10B is a schematic perspective view showing Modification 2 of the dental abutment of FIG. 10A. The schematic cross section which shows the state which carried out the prosthetic restoration of the tooth | gear using the dental abutment of FIG. 12A.

As shown in FIG. 1A, when the crown portion 1 is largely lost and it is difficult to cover the missing tooth with a covering or the like, the crown portion 1 is excised and the pulp 2b is removed from the root canal 2a of the root portion 2. After removal (FIG. 1B), the base of the artificial tooth is fixed (built) to the root canal 2a, and the base is covered with the artificial tooth to restore the prosthesis. The dental abutment 3 (FIG. 2) is inserted and fixed to the root canal 2a and becomes the base of the artificial tooth.

As shown in FIG. 2, the dental abutment 3 is inserted into the root canal 2a (FIG. 1B) of the natural tooth remaining in the patient and fixed to the crown side from the opening 2c of the root canal 2a. It is formed continuously from the insertion fixing part 3a so as to protrude, and is integrally provided with a support part 3b that supports the crown part (prosthetic body, artificial tooth). The dental abutment 3 is, for example, from the upper end (base end) It is formed in a tapered cylindrical shape whose diameter gradually decreases toward the tip (the outer diameter is set to fall within the range of 0.5 to 3 mm).

The insertion fixing part 3a is a part attached to the root canal 2a, and the support part 3b is a part protruding from the opening 2b of the root canal 2a toward the crown.

The insertion portion 3a and the support portion 3b are integrally formed of a resin whose main component is a polyolefin resin. Preferably, it is integrally molded with a resin mainly composed of polypropylene. In the present specification, the “main component” refers to a component having a content of 50% by weight or more.

More specifically, the insertion fixing part 3a and the support part 3b (dental abutment 3) have a weight ratio of 80% polypropylene as a main component, and polypropylene purified by copolymerizing 18% ethylene α-olefin copolymer. It is. This polypropylene has a weight ratio of 80% polypropylene homopolymer [CH2-CH (CH3)] m and 18% ethylene propylene copolymer [CH2-CH (CH3)] m- [CH2-CH2] n as an ethylene α-olefin copolymer. In addition, as additives, magnesium stearate 0.1%, titanium oxide 0.03%, pigment (for example, legal pigments such as aluminum lake or bengara, organic and inorganic pigments, etc.) Or select and blend a plurality of pigments) and adjust to 0.03%. Note that the same amount of iron oxide may be blended instead of titanium oxide, or the total amount of titanium oxide and iron oxide may be 0.03%. In addition to the ethylene propylene copolymer, for example, an ethylene butene 1 copolymer may be used as the ethylene α-olefin copolymer, and further, 18% polyethylene may be contained instead of the ethylene α-olefin copolymer.

Furthermore, substances other than those mentioned above are added as inevitable impurities within a range of 2% by weight or less, as additives for a predetermined purpose of addition, or as a sum of inevitable impurities and a predetermined additive.

The propylene homopolymer, ethylene propylene copolymer, magnesium stearate, titanium oxide (iron oxide), and pigment are mixed and copolymerized, and purified to become a material for the dental abutment 3 by purification. A material is obtained.

Next, an example of a method for manufacturing the dental abutment 3 will be shown. In Example 1 described below, the dental abutment 3 is composed of a ready-made product uniformly formed by a mold. Specifically, the pellet-shaped resin material of the dental abutment 3 is placed in the barrel of a general-purpose resin molding machine, and the furnace temperature is set to 180 ° C. to 230 ° C. to be softened and melted to obtain the shape of the dental abutment 3 The dental abutment 3 is completed by injection-molding the molded mold and polymerizing and curing it.

On the other hand, the artificial tooth attached to the dental abutment 3 is formed corresponding to a location (tooth) where the dental abutment 3 is built. In the first embodiment, the artificial tooth is formed as the first premolar artificial tooth 4 corresponding to the lower first premolar tooth T1 (FIG. 1A) (FIGS. 3A and 3B). A concave hole 4c is formed from the facing surface 4b facing the occlusal surface 4a of the first premolar artificial tooth 4 toward the inside of the artificial tooth. Artificial teeth are commercially available off-the-shelf products such as ceramics, zirconia, polyetheretherketone resin (PEEK resin), and acrylic. From the viewpoint of strength and durability, hard resin teeth, ceramic-coated hard resin teeth, etc. Yes, the inner surface thereof is shaved to form the hole 4c. Further, as a product other than the ready-made product, a product using a dental CAD / CAM system, or a prosthesis or bridge manufactured artificially may be used.

As shown in FIGS. 4A to 4C, when the first premolar artificial tooth 4 is mounted on the dental abutment 3, the support portion 3b of the dental abutment 3 is inserted into the hole 4c. As shown in FIG. 4B (the insertion fixing portion 3a is omitted) (when the hole portion 4c is viewed from the facing surface 4b), the outer edge of the hole portion 4c is set larger than the support portion 3b so as to surround the outer edge of the support portion 3b. Then, as shown in FIG. 4C (when the hole 4c is viewed from the side), the depth of the hole 4c is set so that the entire support 3b is accommodated inside. Note that there is a gap between the hole 4c and the support 3b in a state where the support 3b is simply inserted into the hole 4c.

When the first premolar artificial tooth 4 is mounted on the dental abutment 3, the gap between the hole 4c and the support 3b is filled with inclusions. The inclusion is a clay-like ultraviolet curing resin 5 interposed between the first premolar artificial tooth 4 and the support portion 3b (FIG. 4C), and is polymerized and cured by irradiation with ultraviolet rays.

Returning to FIGS. 1A and 1B, when the crown portion 1 of the first premolar tooth T1 is largely lost (FIG. 1A), the prosthetic restoration using the dental abutment 3 and the first premolar artificial tooth 4 is performed. An example will be described. First, the dentist cuts out the unnecessary crown portion 1 of the first premolar tooth T1, appropriately shapes the upper surface 2e of the root portion 2 so that the artificial tooth can be placed, and then extracts the pulp 2b from the root canal 2a. Next, root canal filling material 6 (FIG. 5A) is filled into the hollow root canal 2 after cleaning and disinfection. Thereby, the apex 2d is sealed. The material and filling method of the root canal filling material 6 may be the same as conventional ones.

Of the root canal filling material 6 in the root canal 2a, the upper part of the root canal 2a is excised if unnecessary. Next, if necessary, the shape of the root canal 2a without the root canal filling material 6 is adjusted to a shape suitable for inserting the insertion fixing portion 3a of the dental abutment 3 prepared in advance. For example, what is necessary is just to cut the wall part of the root canal 2a with a dental instrument so that the root canal 2a may be expanded or a shape may approximate a cylindrical shape.

When the shaping of the root canal 2a is completed, the dental abutment 3 is prepared according to the number of root canals 2a of the tooth to be treated. In the case of the first premolar tooth T1 (two root canals 2a) of the first embodiment, two dental abutments 3 are prepared. Next, the insertion fixing part 3a of the prepared first dental abutment 3 is inserted into one root canal 2a of the first premolar tooth T1 and is planted (attached) (not attached at this time). When the insertion fixing part 3a is inserted into the root canal 2a, the insertion fixing part 3a is softened by heat to shape the shape, or after being cut (cut) and inserted into the root canal 2a, it is shown in FIG. 5B. Thus, the support part 3b is located so as to protrude outward from the opening 2c of the root canal 2a in a rod shape. Similarly, another dental abutment 3 is planted in the other root canal 2a of the first premolar tooth T1 (FIG. 5C). In FIG. 5A and the like, a gap is exaggeratedly drawn between the insertion fixing portion 3a and the root canal 2a to show that the insertion fixing portion 3a is not attached to the root canal 2a.

After mounting two dental abutments 3 in the patient's mouth, a first premolar artificial tooth 4 (FIGS. 3A and 3B) corresponding to the first premolar tooth T1 to be treated is prepared, and an upper surface 2e of the root part 2 is prepared. In addition, the facing surface 4b of the first premolar artificial tooth 4 is appropriately scraped and adjusted so that the facing surface 4b of the first premolar artificial tooth 4 is aligned with the upper surface 2e of the root portion 2 (of the first premolar artificial tooth 4). When the facing surface 4b is placed on the upper surface 2d of the tooth root portion 2, the gap between the facing surface 4b and the upper surface 2e is adjusted as small as possible).

After the shaping of the facing surface 4b of the first premolar artificial tooth 4 is completed, the clay-like ultraviolet curing resin 5 is pushed into the hole 4c of the first premolar artificial tooth 4 with a spatula or the like (FIG. 6A). Under the present circumstances, you may apply | coat the ultraviolet curing resin 5 so that the opposing surface 4b of the 1st premolar artificial tooth 4 may be coat | covered. After filling with the ultraviolet curing resin 5, the first premolar artificial tooth 4 is covered so as to cover the support 3 b (FIG. 5C) of the dental abutment 3, and the first premolar artificial tooth 4 on the dental abutment 3 is covered. The position is adjusted (FIG. 5D).

After the positioning of the first premature artificial tooth 4 is completed, the ultraviolet curing resin 5 (FIG. 4C) filled in the gap between the support portion 3b and the hole portion 4c is irradiated with ultraviolet rays by a light irradiator. Is cured. The ultraviolet curable resin 5 is polymerized, cured, and contracted by the irradiation of the ultraviolet rays, and the dental abutment 3 and the first premolar artificial tooth 4 are integrated (FIG. 5E).

After the dental abutment 3 and the first premolar artificial tooth 4 are integrated, the dental abutment 3 inserted into the root canal 2a is removed together with the first premolar artificial tooth 4, and the ultraviolet light becomes an extra burr by hardening. The cured resin 5 (cured resin) is removed (FIG. 5F). Thereafter, the dental canal 7 capable of obtaining an image reaction is applied to the root canal 2a and the insertion fixing part 3a, and the insertion fixing part 3a is bonded to the root canal 2a to repair the first premolar tooth T1. Is completed (FIG. 5G).

As described above, the dental abutment 3 is formed integrally with a resin mainly composed of polypropylene, so that even if a curved surface or a bent portion exists in the patient's shaped root canal 2a, the dental abutment 3 is flexible. Since it is a raw material, the insertion fixing portion 3a can be reliably inserted up to the apex 2d (shaping tip) of the root canal 2a. For this reason, it is possible to mount the dental abutment 3 that is uniformly formed on each patient, and it is not necessary to collect an impression for forming the dental abutment 3. In addition, since the artificial tooth can be attached to the dental abutment 3 by forming the hole 4c in the ready-made artificial tooth after the dental abutment 3 is attached to the patient, the impression in the patient's mouth is collected once. The treatment is completed without Accordingly, it is possible to provide the dental abutment 3 with less burden on the patient than in the prior art and for completing the treatment in a short time. In addition, after mounting the dental abutment 3, an impression may be collected as usual and a prosthetic body dedicated to the patient may be formed.

Further, since the dental abutment 3 is blended with magnesium stearate as an additive, the resin agitation is high, and the dental abutment 3 is heated to the details of the patient's root canal 2a. It becomes possible to attach, and the insertion fixing part 3a is easily adapted to the root canal 2a of the patient. In addition, since the dental abutment 3 is mounted on the root canal 2a with the dental cement 7 capable of obtaining an image shadow reaction, there is no problem even if the dental abutment 3 mainly composed of polypropylene is not imaged. .

In the unlikely event that a lesion occurs at the apex 2c of the patient, if the abutment is made of metal (conventional product), it is difficult to remove due to high rigidity, but if it is a dental abutment 3 mainly composed of polypropylene It can be easily removed by being rich in elasticity, reducing the burden on the patient.

The dental abutment 3 has 80% polypropylene as a main component in weight ratio, and has the advantages and characteristics that are extremely advantageous compared with the conventional products as listed below by adjusting the above-mentioned resin and the like. Yes.

1. There are few resin allergic reactions in the human body. Since there is no elution of bisphenol A, which is an endocrine disrupting substance, it is highly safe to use for the human body.
2. For all additives, the resin component of the dental abutment 3 is highly safe because there is no elution in the oral cavity, and there is no worry about the additives and pigments in terms of safety (the dental abutment 3 The melting point of the resin material is, for example, about 180 ° C.).
3. If the artificial teeth to be mounted on the metal abutment are made of resin or ceramic, the metallic abutment penetrates from the artificial teeth and is unnatural (especially the front teeth), whereas the dental abutment of the present invention 3. If the artificial tooth to be mounted is made of resin or ceramic, the tooth color can be reproduced on the dental abutment 3 and the aesthetics can be improved (the resin is made by adding a dye to the same color as the tooth color). Possible).
4). By blending magnesium stearate as an additive, all the pigments are evenly mixed at the time of resin dyeing, and the dyeability is greatly enhanced.
5. By blending titanium oxide (iron oxide) as an additive, it is possible to reproduce a natural hue close to natural teeth.
6). For dental molding resin materials (polycarbonate, polyethylene terephthalate (PET), acrylic, etc.) conventionally used, the dental abutment 3 of the present invention is excellent in mechanical strength, bending strength, and heat resistance. Therefore, it does not easily break, and it is very compact and does not feel uncomfortable in the oral cavity. Moreover, since water absorption is very low compared with the conventional resin material, the propagation of miscellaneous bacteria due to water absorption and deterioration of resin physical properties due to aging are extremely small.
7). Since the resin material of the dental abutment 3 is lighter than other resins in specific gravity, the burden on the oral cavity during use is small. Compared to conventional resin materials, it is less likely to absorb moisture in the air, so there is no problem even when stored at room temperature, and there is no need to heat dry to remove moisture even during injection molding. It is also excellent in sex. The resin material of the dental abutment 3 is generally in the form of pellets, but is not limited to this, and may be in the form of a sheet, a block, or the like.

An evaluation test was performed on the dental abutment 3 formed of the resin material as described above. The results are shown in Table 1.

As shown in Table 1, for example, in a repeated bending test, the results before and after water absorption were measured. As a result, the dental abutment 3 was superior to the abutments formed of other dental resin materials. For example, in a repeated bending test before water absorption, the polycarbonate was folded 5 times, the polyethylene terephthalate (PET) + polyethylene composite resin was cracked 14 times and 38 times, and the polyamide was broken 47 times and 129 times. However, in the product of the present invention, the bent portion only became white, and no tears or breakage occurred even after bending 200 times.

In the repeated bending test after water absorption, the polycarbonate was folded at 6 times, the PET + polyethylene was broken at 12 times, and was broken at 51 times, and the polyamide was broken at 53 times and broken at 118 times. Then, the bent part only became white, and there was no tear at 200 times. Also, the bending strength was 61.2 MPa, the elongation was 12 mm or more, the water absorption rate was 0.13% by weight, and the dissolution rate was 0.1% by weight, and very good values were obtained. In addition, good results were obtained as shown in the attached experimental results for workability and coloring.

Supplementing with respect to the coloring test, the “colored ΔE curry” in the second row from the bottom of Table 1 means that a resin piece as a sample is immersed in hot water in which curry powder is dissolved at 37 ° C. for 1 week, and then the sample. The resin piece was taken out and inspected how much it was colored by the curry powder solution with a dedicated testing machine, and the inspection result was quantified. The smaller the value, the lower the degree of coloring, in other words, discoloration Means less. In addition, “colored ΔE fuchsin” is obtained by performing the same inspection using fuchsin as a colorant instead of curry powder, and means that the smaller the inspection value, the less the color change. As is apparent from these results, the test value of “colored ΔE curry” in the present invention is 1.29, the test value of “colored ΔE fuchsin” is 5.19, and test values of polyamide, PET + polyethylene, etc. It can be seen that it is sufficiently small compared to, and difficult to discolor.

Furthermore, a heat resistance test was also performed on the dental abutment 3. Specifically, the resin material of the dental abutment 3 is manufactured and adjusted to a plate material having a size of 20 mm × 20 mm × 3 mm by injection molding, immersed in boiling water (about 100 ° C.) for 1 hour, and the appearance of the plate material It was confirmed. As a result, surface roughness and cloudiness were not observed. Therefore, the same effect can be obtained in the dental abutment 3 manufactured using such a resin material.

Next, the effect of forming the dental abutment 3 as described above with respect to the composition of the dental resin material of the dental abutment 3 will be described (in the following,% refers to the weight ratio unless otherwise specified). If the polypropylene content is less than 65%, peeling breakage tends to occur, and if it exceeds 90%, a problem of incompatibility with the oral cavity due to expansion of the resin body occurs. Therefore, polypropylene may be, for example, 65 to 90%.

Further, if the polyethylene or ethylene α-olefin copolymer is less than 7%, peeling breakage is likely to occur as in the case of polypropylene, and conversely if it exceeds 25%, the oral cavity due to the expansion of the resin body as in the case of polypropylene. In view of incompatibility problems, it is desirable that the polyethylene or ethylene alpha olefin copolymer be in the range of, for example, 7-25%.

Magnesium stearate improves the mutual stirrability and mixing of the pigment, titanium oxide (or iron oxide) and resin, but if it is less than 0.01%, the effect (stirring and mixing in dyeing) In contrast, when the content exceeds 2%, stirring and mixing itself become difficult. For example, addition in the range of 0.01 to 2% is desirable. Here, the term “dyeing” refers to dyeing in a color close to the color of natural teeth when used for the dental abutment 3, for example. A pigment and titanium oxide (or iron oxide) are added for coloring (coloring). For example, in order to produce a color close to natural teeth, the mixing ratio of an appropriate pigment and titanium oxide (white) is adjusted. Further, both titanium oxide and iron oxide can be added to a predetermined pigment to dye the resin in a desired color.

The content of titanium oxide (or iron oxide) is determined mainly by the dyeing method in relation to the pigment, and the magnesium stearate uniformly distributes the pigment, titanium oxide (iron oxide) and the resin material. It can be said that it contributes to the agitation ability to mix, and in turn, to the uniform dyeing property that uniformly colors evenly.

If one or both of titanium oxide and iron oxide is less than 0.001% by weight, the color adjustment function for the pigment cannot be achieved. On the other hand, if it exceeds 1%, the function of color adjustment deviates. Further, in order to inhibit physical properties such as strength of the resin material, it is set within a range of 0.001 to 1%.

As for the composition of the pigment, if it is less than 0.0001% by weight, the dyeing effect cannot be obtained. On the other hand, if it exceeds 1%, the intended dyeability is impaired, and the physical properties of the resin material are not preferable. Therefore, the pigment content is in the range of 0.0001 to 1%.

Further, the dental abutment 3 having a desirable composition is such that the resin is less likely to cause breakage of the resin separation by setting the weight ratio within the range of 75 to 85% polypropylene and 15 to 20% polyethylene or ethylene α-olefin copolymer. Is also suppressed, and for example, the dimensional compatibility and mounting compatibility of the dental molded body in the root canal are improved. The blending ratio of the copolymer polypropylene resin material in the abutment may be 70, 80, or 90% by weight or more.

Further, when magnesium stearate is 0.03 to 0.5%, one or both of titanium oxide and iron oxide is 0.003 to 0.1%, and pigment is 0.001 to 0.1%, magnesium stearate is first used. In the above range, the pigment / titanium oxide (iron oxide) and the resin can be more satisfactorily stirred and uniformly dyed, and the blending amount of one or both of titanium oxide and iron oxide, as well as the pigment By setting the blending amount as described above, the dental abutment 3 (dental molded body) or dental resin material is combined with the effect of the magnesium stearate to give a better coloring / dying effect. be able to.

In any case, by using the dental abutment 3 in the above-mentioned range, for example, the dental abutment 3 has an appropriate bending strength, suppresses the expansion coefficient during cooling after injection molding of the resin body, and remains. It was able to be precisely adapted to natural teeth and artificial dental crowns, and obtained characteristics with moderate hardness to the human body.

If it does not have the composition of the present invention, in other words, deviates from the blending range of the above composition, from the viewpoint of the physical properties of the dental abutment 3 and the dental resin material, the specific bending strength possessed by the present invention cannot be obtained. Bending is easy to crease white, resulting in fractures (of the abutment itself or of teeth other than the abutment), resulting in a very fragile property unsuitable for the human body, and increased expansion even after injection molding, This results in a situation where it cannot be precisely adapted to the remaining natural teeth or artificial crowns.

In addition, as to the effects of adding magnesium stearate and titanium oxide (iron oxide) as additives, by adding these, for example, pigment dyeing suitable for the dental abutment 3 can be achieved, and at the time of injection molding The fluidity of the resin increases and the detail molding reproducibility improves. In addition, when the dental abutment 3 according to the present invention is used and an attempt is made to attach / detach the artificial crown within the oral cavity, the above-mentioned additive reduces the resistance due to friction, resulting in good sliding. Obtained. Therefore, when used by a patient, it is easier to attach and remove compared to conventional products. In addition, according to the dental abutment 3 of the present invention, since the water absorption is extremely low, the propagation of various germs is suppressed, the strength is high, the durability is high, and the specific gravity is small (light), so there is no feeling of wearing, and as a result In addition, the patient can use the dental abutment 3 for a long time in a sanitary and comfortable manner.

When manufacturing the dental abutment 3 using the dental resin material of the present invention, the resin material is melted and the predetermined dental abutment 3 is generally formed by injection molding. As a result, the dental abutment 3 can be obtained that has less resin allergy to the human body as described above and is excellent in safety without leaching of bisphenol A or the like.

Symptoms in which the core or post holder must be removed from the patient after surgery if the post holder that holds the core or post that is a dental molded body is reproduced with this material (dental resin material) When the core and post holder are removed and the conventional metal is used, the residual tooth root of the patient is destroyed very frequently. However, if this material is flexible, the residual tooth root is removed. Can be removed without any burden on the patient.

In the description of the first embodiment, the dental abutment 3 for prosthetic restoration of the first premolar tooth T1 having two root canals 2a has been described. However, a tooth having one root canal 2a (canine teeth, etc.) ), One dental abutment 3 and artificial teeth are used (FIG. 7A), and if there are three root canals 2a (molar teeth), three dental abutments 3 and artificial teeth are used. (FIG. 7B) The prosthesis can be repaired. Therefore, the present invention is applied without limitation to the number and shape of all root canals 2a and the remaining shape of natural teeth.

In Example 1 described above, as a treatment method using the dental abutment 3, a method in which the dental abutment 3 and the artificial tooth are integrated with each other and the dental abutment 3 is attached to the root canal 2 a is exemplified. Alternatively, artificial teeth may be attached to the dental abutment 3 after the dental abutment 3 is attached to the root canal 2a. When attaching the dental abutment 3 to a place where it is difficult to work such as the back teeth, the working efficiency is increased by attaching the dental abutment 3 to the root canal 2a first.

In the first embodiment, the columnar dental abutment 3 whose diameter is continuously reduced from the upper end toward the lower end is illustrated. However, as shown in FIG. 8A, the support portion 3b is formed in a columnar shape. The insertion fixing part 3a may be formed in a conical shape (tapered shape) whose diameter continuously decreases toward the lower end. By making the support part 3b cylindrical, the support part 3b and the ultraviolet curing resin 5 are firmly integrated. Moreover, it becomes easy to insert to the back of the root canal 2a by making the insertion fixing | fixed part 3a conical.

As shown in FIG. 8B, the support portion 3b may be formed in a cylindrical shape, and the insertion fixing portion 3a may be formed in a cylindrical shape that is coaxial with the support portion 3b and has a smaller diameter than the support portion 3b. By making the insertion fixing portion 3a cylindrical, it becomes easy to insert the patient's root canal 2a into the root canal 2a without shaping the patient's root canal 2a much.

As shown in FIG. 8C, the support portion 3b may be formed in a columnar shape, and the insertion fixing portion 3a may be formed in a conical shape having a bottom surface that is a circle coaxial with the support portion 3b and having a smaller diameter than the support portion 3b. By increasing the diameter of the support portion 3b, it becomes easier to support the artificial tooth. Further, the insertion fixing portion 3a may have a shape in which the diameter is gradually reduced (FIG. 8D) or a shape in which only the tip portion is conical (FIG. 8E).

In addition, by setting the outer diameter of the dental abutment 3 to 0.5 to 3.0 mm, the insertion fixing portion 3a can be easily inserted into the root canal 2a shaped with a dental drill.

Further, as shown in FIG. 9, a step is provided in the root canal 2a (for example, the center of each circle is shifted so that two circles having different outer diameters overlap each other so as to have a gourd shape in plan view). By using the two dental abutments 3 for one root canal 2a, lateral displacement of the artificial teeth attached to the dental abutment 3 can be suppressed.

In Example 1 described above, the ready-made dental abutment 3 is illustrated and described, but in Example 2 described below, a dental abutment 30 formed from an impression collected for each patient will be described. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

As shown in FIG. 10A, the dental abutment 30 is inserted so as to protrude from the opening 2c of the root canal 2a toward the tooth crown side, and is inserted into the root canal 2a of the remaining natural tooth and fixed. A support portion 30b that is formed continuously from the fixing portion 30a and supports the artificial teeth is integrally provided. The insertion fixing part 30a is formed along the root canal 2a of the patient, and the support part 30b protrudes from the opening 2c of the root canal 2a to the outside of the root canal 2a and protrudes toward the crown, thereby directly supporting the artificial tooth. . The resin material and composition of the dental abutment 30 are the same as those in the first embodiment.

Next, an example of a method for manufacturing the dental abutment 30 will be described. For example, when the first premolar tooth T1 is largely lost (FIG. 1A), the dental crown 1 of the first premolar tooth T1 of the patient's lower jaw is excised by the dentist, the pulp 2b is removed from the root canal 2a, and the root After the shape of the tube 2a is adjusted (FIG. 1B), an impression material (for example, dental cement) is used to collect the impression of the root canal 2a (including residual natural teeth), and a mouth model (gypsum model) is created from the impression. Then, after forming the mold of the dental abutment 30 (FIG. 10A) using dental wax on the mouth model, the mold was buried in gypsum, and after the gypsum was cured, the wax was poured with hot water ( Flowing wax), the wax part is made hollow. On the other hand, the pellet-shaped resin material of the dental abutment 30 is put into the barrel of a general-purpose resin molding machine, and the furnace temperature is set to 180 ° C. to 230 ° C. to be softened and dissolved. The dental abutment 30 is completed by injection-molding the softened / dissolved material into the gypsum cavity and polymerizing and curing the material (FIG. 10A).

When artificial teeth are mounted on the support portion 30b of the dental abutment 30, a concave hole portion 4c is formed in the artificial tooth so that the support portion 30b can be fitted without a gap, and the concave hole portion 4c and the convex portion are convex. The support portions 30b are joined by dental cement 7 (not shown) (FIG. 10B). Further, the artificial tooth may be fixed to the support portion 30b by another means (for example, a bridge portion connected to an adjacent natural tooth) without joining the hole portion 4c and the support portion 30b.

The dental abutment 30 can be molded by taking an impression in the patient's mouth and forming an insertion fixing portion 30a that is adapted to the details of the patient's root canal 2a. The dental abutment 30 can be formed into the patient's root canal. It becomes easy to insert in 2a. Further, since the support portion 30b protrudes from the opening 2c of the root canal 2a to the outside of the root canal 2a and protrudes toward the crown, and directly supports the artificial tooth (FIG. 10B), the position shift of the artificial tooth can be suppressed.

In the description of the second embodiment, the example in which the insertion fixing portion 30a of the dental abutment 30 is formed in a bifurcated shape has been described. However, as shown in FIGS. 11A and 11B and FIGS. 12A and 12B, the insertion fixing portion 30a. Therefore, the present invention can be applied to any number or shape of root canals 2a, remaining shapes of natural teeth, etc. without any limitation.

The dental abutment 30 is formed by taking an impression, but the shape of the dental abutment 30 mounted in the mouth is directly measured by light such as a laser (optical impression method), so-called dental CAM. A dental abutment 30 that fits the patient may be designed and molded by the CAD system. Similarly, an artificial tooth may be molded by a dental CAM / CAD system, or a hard artificial tooth that is a ready-made product may be used.

As mentioned above, although Example 1 and 2 of this invention were demonstrated, this invention is not limited to the specific description, It can also implement combining the illustrated structure etc. suitably in the range with no technical inconsistency. It is possible, and certain elements and processes can be replaced with known forms.

In the description of Examples 1 and 2 described above, the first premolar artificial tooth 4 is exemplified, but permanent teeth such as the second premolar, the first premolar, the second premolar, the canine, the side incisor, and the central incisor. Artificial teeth corresponding to can be used.

In addition, when attaching dental abutments 3 and 30 (

insertion fixing portions

3a and 30a) to the root canal 2a or attaching artificial teeth to the dental abutments 3 and 30 (

support portions

3b and 30b), A rough surface is formed on the

insertion fixing parts

3a, 30a and the

support parts

3b, 30b, and then fixed with the dental cement 7 or the ultraviolet curing resin 5, and the

dental abutments

3, 30 are fixed to the root canal 2a and the artificial teeth. It is good also as a strong thing.

DESCRIPTION OF SYMBOLS 1 Crown part 2 Dental root

2a Root canal

2b Dental pulp 2c Opening 2d Apex 2e Upper surface 3 Dental abutment 3a Insertion fixing part 3b Support part 4 First premolar artificial tooth (artificial tooth part) 4a Occlusal surface 4b Opposite surface 4c Hole Part 5 UV curable resin 6 Root canal filling material 7 Dental cement T1 First premolar

Claims

An insertion fixing part that is inserted into and fixed to the root canal of the remaining natural tooth, and is formed continuously from the insertion fixing part so as to protrude from the opening of the root canal to support the artificial tooth part. And a support part, wherein the insertion fixing part and the support part are formed of an integrally molded product of a resin containing a polyolefin resin as a main component of 50% by weight or more.
The dental abutment according to claim 1, wherein the support portion protrudes from the root canal opening to the outside of the root canal and protrudes toward the crown to directly support the artificial tooth portion.
The said support part protrudes in a rod shape from the opening of the said root canal to the crown side, and supports the said artificial tooth part indirectly through the intervention interposed between the said artificial tooth part and the said support part. The dental abutment according to 1.
The dental abutment according to claim 3, wherein the inclusion is an ultraviolet curing resin.
The dental abutment according to any one of claims 1 to 4, wherein the dental abutment is made of an integrally molded product of a resin whose main component is polypropylene, in which polypropylene accounts for 50% by weight or more.
The insertion fixing part and the support part are 65 to 90% by weight of polypropylene, 7 to 25% by weight of polyethylene or ethylene α-olefin copolymer, 0.01 to 2% by weight of magnesium stearate, and one of titanium oxide and iron oxide. 6. The dental abutment according to claim 5, wherein the dental abutment is composed of an integrally molded product mainly composed of a copolymerized polypropylene resin material containing 0.001 to 1% by weight of both and 0.0001 to 1% by weight of pigment.
The insertion fixing part and the support part are 75 to 85% by weight of polypropylene, 15 to 20% by weight of polyethylene or ethylene α-olefin copolymer, 0.03 to 0.5% by weight of magnesium stearate, titanium oxide and iron oxide. The dental product according to claim 5, comprising an integrally molded article mainly composed of a copolymerized polypropylene resin material containing 0.003 to 0.1% by weight of one or both of these and 0.001 to 0.1% by weight of a pigment. Abutment.
A resin material used for producing the dental abutment according to any one of claims 1 to 7, wherein 65 to 90% by weight of polypropylene and 7 to 25% by weight of polyethylene or ethylene α-olefin copolymer The main component is a copolymerized polypropylene resin material containing 0.01 to 2% by weight of magnesium stearate, 0.001 to 1% by weight of one or both of titanium oxide and iron oxide, and 0.0001 to 1% by weight of pigment. A dental resin material characterized by the above.
A resin material used for producing the dental abutment according to any one of claims 1 to 7, wherein the polypropylene is 75 to 85% by weight, and the polyethylene or ethylene α-olefin copolymer is 15 to 20% by weight. %, Magnesium stearate 0.03-0.5% by weight, one or both of titanium oxide and iron oxide 0.003-0.1% by weight, pigment containing 0.001-0.1% by weight A dental resin material comprising a polypropylene resin material as a main component.