JP2004500959A - Denture and method of forming the same - Google Patents

Abstract

The present invention relates to a denture having at least two separately arranged composite layers, wherein the first composite layer acts as a lower layer of the denture and the second composite layer acts as a cutting part of the incisor of the denture. I do. Furthermore, the invention relates to a denture as described above, wherein the at least one separately arranged composite layer comprises one or more organic compounds, preferably in the form of a dental composite.

Description

【００４０】
複合ベース材料１を、型に入れた（図２参照）。
【００４１】
型は上面についてはプレートを用いて閉鎖し、側面は透明プレートで閉鎖し、それを、ベースの上で接続した。
【００４２】
異なる層を注入した後、デガラックス（Ｄｅｇｕｌｕｘ）（デガッサ、ビーアールディー：Ｄｅｇｕｓｓａ， ＢＲＤ）を用いて、各層を二分間照射した。それによって、各層を硬化した。
【００４３】
その後、次に硬化した各層を、ミリング・バイス（ｍｉｌｌｉｎｇ ｖｉｃｅ）内で、コンピュータに登録した所望の形状に、自動的に切削加工した。
【００４４】
次に、象牙質層Ｂと切削層Ｃを射出して形成し、硬化し、切削加工した。
【００４５】
義歯を研磨した後、最後に、基礎４とベース１を除去した。
【００４６】
実施例２
この実施例では、熱硬化性バインダー、ポリアミドが供給された繊維強化複合材料を、射出してかたどった。
【表２】

【００４７】
メタクリレート樹脂は、
１−メチルエチリデン）ビス［４−１−フェニルオキシ（２−ヒドロキシ−３−１−プロパンジイル）ビスメタクリレート；
７，７，９−トリメチル−４，１３−ジオキソ−３，１４−ジオキサ−５，１２−ジアザ−ヘキサデカン−１，１６−ジオール−ジメタクリレート；及び
１，１２−ドデカノール−ジメタクリレート
の１１．５：３０．５：１３．５の重量比の混合物から成る。
【００４８】
象牙質層及び切削層用充填剤は、６．０：７５．０の比の二酸化ケイ素と”グラスフリット”から成る。さらに、極めて少量の色素を加えた。
【００４９】
ベース用の複合材料を、３００℃で型に入れ、その後、義歯を、実施例１に示したように、加工した。
【００５０】
本発明は、特定の記載によって何ら制限されるものではないが、上述の特許請求の範囲によって、定められる。
【図面の簡単な説明】
【図１】図１Ａ〜Ｅは、ベース・ダイの形成と、その上の義歯の層の配置を模式的に示す。
【図２】図２は、部分的に切り取られた型の側立面図であり、隠れたダイは、その上の種々の義歯の層を配置する間に切削加工される。
【図３】図３は、成型された石膏の基部上の、本発明に基づく義歯のベース層の透視図を示す。
【図４】図４は、基部上の、本発明に基づく義歯の部分的に切り取られた透視図を示す。[0001]
The present invention relates to a denture (or dental prosthesis) and a method of forming (or manufacturing) the same.
[0002]
Dentures are often formed, for example, from simple blocks (or blocks) of dental porcelain.
[0003]
The problem with these types of dentures is that the material of the denture should be translucent in order to make it aesthetically compatible with the natural tooth to be replaced, but such a material must be dental (or dental) That is, the strength inherently results in a very weak denture.
[0004]
Often, opaque and colored dentures result in dentures having the desired structural, dental strength, in which case, due to the aesthetic quality of the denture, much is required. You.
[0005]
It is an object of the present invention to provide an improved denture for this situation.
[0006]
According to one aspect of the present invention, there is provided a denture according to claims 1 to 23.
[0007]
The present inventor has disclosed that by providing a synthetic layer separately (or individually), preferably automatically, on top of another to form a denture to provide a denture, The first composite layer acts (works or can be used) as a body layer, the second composite layer acts as a cutting part of the incisor (incision or incisal edge), the different layers preferably comprising an organic composite material. Has been shown to provide both the desired dental aesthetic effect and the desired dental functional strength.
[0008]
According to a second aspect of the present invention, there is provided a method (or process) for forming (or producing) a denture according to the present invention according to claims 25 and 26.
[0009]
The present invention will be described below with reference to the accompanying drawings.
[0010]
The base die (1) of FIG. 1A, preferably made of gypsum, is modeled (model or template) to the shape of the root (FIG. 1B) on which the denture according to the invention is to be provided.
[0011]
To obtain this die (1), the impression of the root is first cast with gypsum. Therefore, the obtained plaster model (plaster model) is scanned (or scanned) using a digital camera, and the data is input to a computer. The lower part of the model is painted black to indicate the lower edge of the denture to be made. When scanning gypsum prototypes, a fast laser strip scan method can be used, thereby measuring the three-dimensional geometry (or structure) of the gypsum prototype of the root and surrounding teeth. can do.
[0012]
If the three-dimensional shape of the denture can be measured directly in the mouth, the formation of a gypsum prototype can be omitted.
[0013]
Information about the three-dimensional shape and geometry of the denture is provided to the computer. If necessary, additional information can be provided regarding the exact lower edge of the denture to be formed, separation lines with adjacent tooth elements, etc. From this information, the position of the engagement line can be determined. Within the supplied or determined parameters for the shape and geometry of the denture to be formed, one can choose from a number of standard shapes or, if this information is useful, the original tooth shape or geometry. The information about can be used.
[0014]
For example, a dental element (or dental element) in the form of a mirror image can be used, in which case this information is scanned and entered into a computer and used as a starting point for providing a denture. These last aspects relate to the contour of the denture to be formed, which has the shape of the root or the base of the tooth for the denture, depending on the internal workings.
[0015]
If necessary, the final shape of the denture can be drawn by computer simulation, together with the adjacent dental elements, to ensure that the denture works correctly with the adjacent teeth. The final shape of the provided denture can then be adjusted based on gnatological rules. In this way, the shape of the denture can be adjusted to provide optimal teeth with respect to contact of both adjacent dental elements or teeth with opposing dental elements or teeth. The movement as well as the static relationship between the adjacent dental element or tooth or the opposing dental element or tooth and the denture are taken into account. In particular, for three-dimensional mandibular movement, normal movements do not interfere with the chewing movements and may be caused by irrelevant foreign objects or protrusions that can result in trauma or uneven stress distribution with respect to dental elements and teeth. It needs to be maintained undisturbed.
[0016]
In this way, the inner surface of the denture and the outer surface of the denture placed on the tooth base (or stand) can be optimally determined.
[0017]
After determining the action of the inner (or inner) denture and the action of the outer (or outer) denture, the interface between the cement and the incisal composite of the core and the dentin composite and the cutting The interface between (or cutting) the composite material can be determined. Use the software to calculate the interior surface modified with terminal gaps, total cement thickness and composite core material thickness, and various interfaces between material layers, as specified by the operator . For example, the structure of a denture, taking the shape of a crown, is based on data registered in a computer, and the thickness of the cement between the die made of gypsum and the composite core material is larger than the cement gap at the end. Ensure that it is. In this way, a better support for a high strength core material is provided, which core material will receive most of the load acting on the denture during placement and chewing. Stress on the core composite is relieved because the high strength core foundation is so close to the die. This means that there is no restriction on the type (or form) of the forming method chosen, and that the shoulders of the composite material of the underlying structure of the denture can be used to enhance the beauty. .
[0018]
Thereafter, a denture according to the present invention can be formed (made or manufactured) as described below.
[0019]
A block of a predetermined material (see FIG. 1A) is fixed to a high-precision vise (or vice) of a cutting machine (or milling machine), and has an uneven surface opposite to the inner surface of the denture. Is accurately machined (milled or milled) using a computer controlled cylindrical disk mill or round hard metal mill.
[0020]
The resulting die for a denture is shown in FIG. 1b.
[0021]
FIG. 3 shows the base 1. See also FIGS. 1, 2 and 4 provided with a head 2 made of gypsum and cut by a cutting machine as described above. While cutting the block (see FIG. 1A), the double prismatic base 4 (see FIGS. 1 to 4) is fixed to a high-precision vise of a cutting machine.
[0022]
The foundation 4 is double prismatic, which allows the blocks to be removed and replaced in the cutting machine during other forming steps.
[0023]
Once the die head 2 has been machined (see FIG. 1B), a layer of high strength core composite material is injected and placed thereon, which may be an injection mold (or mold: mold) performed in M
[0024]
This layer 6 is then cured to provide a denture base core layer (see FIGS. 1C, 1D and 3).
[0025]
Due to the tackiness of the thermoplastic resin, as the layer cures, the base core layer 6 releasably adheres to the die head 2 so that this adhesion forces the die core during further machining. Ensure that the layer of thermoplastic resin remains on the head 2.
[0026]
When cutting this core layer so that it can be further processed (or processed) in a dental laboratory that can handle the core layer and supply the resin layer to the core layer further The core layer 6 can be removed from the die head 2. However, in accordance with the present invention, tooth layers and cutting layers (or cutting layers) are created by computer controlled systems (or systems) that use geometric (or geometric) information from CAD / CAM systems (or systems). Further, it is preferable to automatically supply and finish.
[0027]
After the hardening of the base core layer 6, the block is returned to the cutting machine and the computer controlled cutting machine automatically cuts the base layer 6 inside the scanned gypsum prototype of the dental stand. Then, the base core layer 6 is cut.
[0028]
After that, the base 1 is put back into the injection mold M, the body layer 8 is placed thereon, cured as described above, and cut. Thereafter, the incisor portion of the denture is similarly arranged (see FIGS. 1D and 1E).
[0029]
FIG. 4 shows the completed denture P in the form of a crown consisting of the core 6, the dentin 8 and the cutting part 10.
[0030]
As mentioned above, the high strength base core layer 6 in the form of a composite material is over-injected and molded onto the die head 2, where the composite material can comprise a resin binder. Understood.
[0031]
The shape of the core layer can be formed by injection molding, spraying, or molding by any appropriate method with a binder of a thermosetting resin, and then, by heating, chemical curing, light curing, etc. The material can be cured, and the cured layer can then be cut to a pre-designed thickness with a cutting machine.
[0032]
When using a UV-cured composite material, in the case of a bridge (or bridge), for example, it is possible to put glass fibers into the composite material in the longitudinal direction of the bridge in order to strengthen it before curing. it can.
[0033]
Examples of suitable thermoplastic binders are polyamides or polyacetals.
[0034]
Examples of thermosetting binders include epoxy resins, formaldehyde, polyisocyanates and polyesters.
[0035]
The inorganic filler may comprise a material such as oxide or glass in the form of balls, discs or fibers.
[0036]
The final step of denture formation according to the invention is the separate (or individual) coloring and polishing of the denture.
[0037]
Example 1
A bridge according to the invention was made up of various layers of a composite material, a methacrylate synthetic resin supplied with SiO ₂ filler.
[0038]
Methacrylate resin is
1-methylethylidene) bis-4-1-phenyloxy (2-hydroxy-3,1-propanediyl) bismethacrylate;
7,7,9-Trimethyl-4,13-dioxo-3,14-dioxa-5,12-diaza-hexadecane-1,16-diol-dimethacrylate; and 11.5 of 1,12-dodecanol-dimethacrylate Consisting of a mixture in a weight ratio of 30.5: 13.5,
SiO ₂ filler was quenched Shiriamin (Siliamin) 1,1,1- trimethyl -N- (trimethyl) "Glass frit (grasfrit)" (molten glass in water are mashed in the next small size ), Titanium dioxide and zirconium dioxide in a weight ratio of 3.0: 45.0: 8.0: 8.0, and B and C fillers, body part and incisor part were 6.0. Consists of silicon dioxide in a ratio of ッ ト 75.0 and “glass frit”.
[0039]
A negligible amount of coloring dye was also added. See the following table.
[Table 1]

[0040]
The composite base material 1 was placed in a mold (see FIG. 2).
[0041]
The mold was closed with a plate on the top and the side was closed with a transparent plate, which was connected on the base.
[0042]
After injecting the different layers, each layer was irradiated for 2 minutes using a Degulux (Degassa, DeRussa, BRD). Thereby, each layer was cured.
[0043]
Thereafter, each of the next cured layers was automatically cut into a desired shape registered in a computer in a milling vice.
[0044]
Next, the dentin layer B and the cutting layer C were formed by injection, cured, and cut.
[0045]
After polishing the denture, finally the base 4 and the base 1 were removed.
[0046]
Example 2
In this example, a fiber reinforced composite material provided with a thermosetting binder, polyamide, was injected and shaped.
[Table 2]

[0047]
Methacrylate resin is
1-methylethylidene) bis [4-1-phenyloxy (2-hydroxy-3--1-propanediyl) bismethacrylate;
11.5 of 7,7,9-trimethyl-4,13-dioxo-3,14-dioxa-5,12-diaza-hexadecane-1,16-diol-dimethacrylate; and 1,12-dodecanol-dimethacrylate : 30.5: 13.5 in weight ratio.
[0048]
The filler for the dentin layer and the cutting layer consists of silicon dioxide in a ratio of 6.0: 75.0 and "glass frit". In addition, a very small amount of dye was added.
[0049]
The composite material for the base was placed in a mold at 300 ° C., after which the denture was processed as described in Example 1.
[0050]
The present invention is not limited by the specific description, but is defined by the appended claims.
[Brief description of the drawings]
1A to 1E schematically show the formation of a base die and the arrangement of denture layers thereon.
FIG. 2 is a side elevational view of a partially cut-away mold, wherein a hidden die is machined while placing various denture layers thereon.
FIG. 3 shows a perspective view of the base layer of a denture according to the invention on the base of the cast gypsum.
FIG. 4 shows a partially cut-away perspective view of a denture according to the invention on a base.

Claims (28)

A denture comprising at least two separately arranged composite layers, wherein the first composite layer acts as a lower layer of the denture and the second composite layer acts as a cutting part of the incisor of the denture . 2. The denture according to claim 1, wherein at least one of the separately arranged composite layers comprises one or more organic compounds, preferably in the form of a dental composite. 3. The denture according to claim 1, wherein at least one or more of the composite layers comprises one or more inorganic compounds, preferably a ceramic material. 4. The method according to claim 1, wherein the separate layers are automatically positionable on the other upper edge, preferably by means of a computer control system, using geometric information preferably obtained via a CAD / CAM system. Denture according to any of the above. The denture according to any one of claims 1 to 4, wherein the organic compound is a synthetic curable resin. The denture according to claim 5, wherein the resin comprises one or more polymers. 7. The denture according to claim 6, wherein the polymer comprises an acrylic resin. 8. The denture according to claim 7, wherein the acrylic resin comprises a thermoplastic polymer or thermoplastic copolymer of acrylic acid, methacrylic acid, esters of those acids or acrylonitrile. 9. The denture of claim 8, wherein the acrylic resin comprises one or more of the following esters of methacrylic acid:
1-methylethylidene) bis [4,1-phenyloxy (2-hydroxy-3,1-propanediyl) bismethacrylate;
7,7,9-trimethyl-4,13-dioxo-3,14-dioxa-5,12-diaza-hexadecane-1,16-diol-dimethacrylate; and 1,12-dodecanol-dimethacrylate. 10. Denture according to claim 9, wherein the ester is present in an amount on the order of 10%, in the range of 5-50%, preferably 10-40%, more preferably 15-30%, even more preferably about 19%. The denture according to any one of claims 1 to 10, wherein the organic compound is a composite material. The denture according to claim 11, wherein the composite material further comprises one or more of the following inorganic materials:
Denture fillers and / or pigments. 13. The denture according to claim 12, wherein the denture filler material comprises ceramic. One or more layers, glass component, preferably 55 to 75 wt% of _SiO 2, 0.5 to 30 wt% of _Al 2 _O 3, 0.5 to 30 wt% of _K 2 O, 0 .5～15 wt% of Na ₂ O and 0.5 to 30 wt% glass component comprising LiO _2, as well as optionally 5% by weight or less, one or more of the following things: BaO _{, CaO, SrO, La 2 O} 3, Sb 2 O 3, TiO 2, F 2, B 2 O 3, ZnO, MgO and CeO _2, further comprising claim 13 denture according. Consists essentially of three layers, separately, preferably automatically, placed, separately cured and separately cut into a predetermined shape, the layers being the tooth base layer, the ivory The denture according to any one of claims 1 to 14, which corresponds to the material layer and the cutting layer. The base layer comprises at least 20%, for example 30%, 40%, 50 or 60%, preferably at least 70% and more, preferably at least 80%, of the filler, with the remainder formed from organic compounds and dyes. 15. The denture according to claim 14, wherein the pigment is present at an upper limit of 5%, preferably at an upper limit of at least 2%, most preferably at an upper limit of at least 1% by weight. The dentin layer comprises at least 50% by weight, for example 60 or 70% by weight, preferably at least 80% by weight, most preferably at least around 90% by weight of filler, the remainder being formed from organic compounds and pigments. 17. Denture according to claim 15 or 16, wherein the pigment is present at most 5% by weight, preferably at most 2% by weight, more preferably at most 1% by weight. The denture according to any one of claims 15 to 17, wherein the weight percentage of the filler in the dentin layer and / or the cutting layer is at least twice the amount present in the base layer. 19. The method according to claim 15, wherein the weight percentage of the organic compound in the base layer is at least 1.5 times, preferably at least twice the amount of the organic compound present in the dentin layer and / or the cutting layer. Denture. A denture comprising a SiO ₂ filler material and a methacrylate synthetic resin, wherein the methacrylate synthetic resin comprises:
1-methylethylidene) bis [4,1-phenyloxy (2-hydroxy-3,1-propanediyl) bismethacrylate;
A mixture of 7,7,9-trimethyl-4,13-dioxo-3,14-dioxa-5,12-diaza-hexadecane-1,16-diol-dimethacrylate; and 1,12-dodecanol-dimethacrylate, preferably 20. A denture according to any of the preceding claims, comprising a mixture in a weight ratio of about 11.5: 30.5: 13.5. 21. The denture of claim 20, further comprising a glass fiber reinforced material, wherein the glass fibers are preferably exclusively present in the base layer. 22. The denture according to claim 1, wherein the base layer has a three-point bending strength of at least 200 Mpa, for example, 300 Mpa, preferably at least 380 Mpa. 23. The denture according to claim 22, wherein the body and the incisor have a three-point bending strength of at least 40 Mpa, for example at least 60 Mpa, most preferably at least 80 Mpa. The base layer has a transparency in the range of 0-10%, preferably in the range of 0-5%, and the dentin layer has a transparency in the range of 10-50%, for example 10-40%, preferably 20-20%. 24. Any of claims 1 to 23 having a transparency in the range of 25%, wherein the cutting layer has a transparency in the range of 20 to 80%, for example in the range of 25 to 50%, preferably in the range of 30 to 40%. The denture described in Crab. Supplying a mold for a denture,
Automatically placing the first synthetic layer on this mold,
The step of curing the synthetic layer, and the step of cutting the cured synthetic layer into a shape determined using a computer,
25. The method of providing a denture according to any of the preceding claims, comprising the step of repeating these steps for one or more other layers to form a denture. 26. The method of making a mold using data obtained using a computer system, preferably a CAD / CAM system, wherein the mold is preferably made of gypsum. A denture obtainable by the method according to claim 25 or 26. 26. Use of a denture according to any of claims 27 or 1 to 25, partially or completely replacing one or more teeth.