WO2015045698A1 - 歯科用レジンブロックの製造方法 - Google Patents
歯科用レジンブロックの製造方法 Download PDFInfo
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- WO2015045698A1 WO2015045698A1 PCT/JP2014/071997 JP2014071997W WO2015045698A1 WO 2015045698 A1 WO2015045698 A1 WO 2015045698A1 JP 2014071997 W JP2014071997 W JP 2014071997W WO 2015045698 A1 WO2015045698 A1 WO 2015045698A1
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- Prior art keywords
- mold
- dental resin
- dental
- resin block
- paste
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/20—Methods or devices for soldering, casting, moulding or melting
- A61C13/206—Injection moulding
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0022—Blanks or green, unfinished dental restoration parts
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/08—Artificial teeth; Making same
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/08—Artificial teeth; Making same
- A61C13/081—Making teeth by casting or moulding
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/08—Artificial teeth; Making same
- A61C13/087—Artificial resin teeth
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/70—Tooth crowns; Making thereof
- A61C5/77—Methods or devices for making crowns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/40—Plastics, e.g. foam or rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0227—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using pressure vessels, e.g. autoclaves, vulcanising pans
- B29C35/0238—Presses provided with pressure vessels, e.g. steam chambers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2901/00—Use of unspecified macromolecular compounds as mould material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
- B29L2031/7532—Artificial members, protheses
- B29L2031/7536—Artificial teeth
Definitions
- the present invention relates to a method for manufacturing a dental resin block used when a dental prosthesis such as an inlay or a crown is manufactured by cutting using a CAD / CAM device.
- the paste-like dental composite resin is polymerized and cured in the cavity of the tooth, so it is inevitable that unpolymerized monomers remain, resulting in the problem of pulp stimulation. is there.
- the shape of the oral cavity and the target site for producing the prosthesis vary depending on each patient, and the prepared dental prosthesis Since an object is required to have a very high dimensional accuracy of several ⁇ m, not only the skill of an engineer but also a lot of time and cost are required.
- CAD / CAM has been designed in which a dental prosthesis such as a crown or bridge is designed on a screen using a computer, and the dental prosthesis is manufactured by cutting.
- Devices have been increasingly applied. Accordingly, a dental prosthesis having a certain quality can be stably supplied in a short time.
- a dental resin block in which a dental resin is formed into a block shape is used as a material before cutting out the shape.
- This dental resin block is, for example, an acrylic resin made of a material containing an inorganic filler having an average particle size of 0.001 ⁇ m or more and 0.04 ⁇ m or less in a range of 20 mass% or more and 70 mass% or less as described in Patent Document 1.
- This is a block-shaped resin polymer.
- the dental resin material before polymerization is pressurized and heated under conditions of a pressure of 50 MPa to 300 MPa and a temperature of 100 ° C. to 200 ° C. to polymerize and cure to obtain a block-shaped dental resin material. Therefore, it is necessary to insert the paste before polymerization into a mold and pressurize it using a hot press machine.
- this dental resin material is an acrylic resin containing an inorganic filler having an average particle size of 0.001 ⁇ m or more and 0.04 ⁇ m or less in a range of 20% by mass to 70% by mass, the viscosity before polymerization (curing) is low. Very expensive. As a result, there has been a problem that air bubbles are involved when polymerizing by pressurizing and heating as described above. In addition, cracks may occur during curing. A dental resin block in which air bubbles are entrained or cracked in this way cannot be said to have a good quality, and it is easy to cause chipping in which details are lost during cutting in a CAM, and a high-precision dental prosthesis. I could't get anything.
- an object of the present invention is to provide a method for producing a dental resin block in which bubbles and cracks are unlikely to occur.
- the present inventor put the composition before curing into a mold that is not made of metal, and pressurizes it in a container that can make the entire mold have a predetermined pressure. And the present invention was completed by finding the knowledge that the generation of bubbles and cracks can be suppressed by heating and polymerizing so that the pressure inside and outside the mold is equal. The present invention will be described below.
- a step of injecting a material before curing to become a dental resin block into a mold formed of a material other than a metal, and a mold and a material before curing injected into the mold comprising a step of pressurizing at 0.0 MPa or higher and a step of heating a mold and a material injected into the mold at 60 ° C. or higher.
- the method for producing a dental resin block according to the present invention it is possible to provide a high-quality dental resin block that can suppress bubbles and cracks and does not cause chipping during production.
- the dental resin material used in this embodiment will be described. Then, the manufacturing method of the dental resin block using this material is demonstrated.
- a methacrylate compound or an acrylate compound that has been conventionally used in many dental materials can be used.
- the methacrylate compound or acrylate compound include methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 2-hydroxy-1,3-dimethacryloxypropane, n-butyl methacrylate, isobutyl methacrylate, Tetrahydrofurfuryl methacrylate, glycidyl methacrylate, 2-methoxyethyl methacrylate, 2-ethylhexyl methacrylate, benzyl methacrylate, phenyl methacrylate, phenoxyethyl methacrylate, 2,2-bis (methacryloxyphenyl) propane, 2,2-bis [4- ( 2-hydroxy-3-methacryloxypropoxy) phenyl] propane, 2,
- a polymerization catalyst is used.
- a heating polymerization catalyst is preferable as the polymerization catalyst because it is molded by heating under pressure.
- the thermal polymerization initiator an organic peroxide, an azo compound, or the like is used. Specifically, benzoyl peroxide, ketone peroxide, peroxyketal, hydroperoxide, dialkyl peroxide, diacyl peroxide are used.
- Peroxyester peroxydicarbonate, 2,2'-azobisisobutyronitrile, 2,2'-azobis-2,4-dimethylvaleronitrile, 4,4'-azobis-4-cyanovaleric acid 1,1′-azobis-1-cyclohexanecarbonitrile, dimethyl-2,2′-azobisisobutyrate, 2,2′-azobis- (2-aminopropane) dihydrochloride, etc. Or they can be mixed and used.
- a filler is added to the dental resin material.
- an inorganic filler having an average particle diameter of 0.01 ⁇ m to 2 ⁇ m is preferable.
- Colloidal silica is generally used as the inorganic filler having an average particle size of 0.01 ⁇ m or more and 0.04 ⁇ m or less.
- Aerosil OX-50 average particle size 0.04 ⁇ m
- Aerosil R-972 Nippon Aerosil Co., Ltd.
- An average particle size of 0.016 ⁇ m can be used.
- pulverized glass powder As an inorganic filler having an average particle size of 0.1 ⁇ m or more and 2 ⁇ m or less, pulverized glass powder is generally used, and its composition is not particularly limited, but quartz glass, aluminosilicate glass, X-ray contrast properties A glass containing alkaline earth metal atoms such as calcium, strontium, and barium, zinc glass, lead glass, and the like are preferable.
- the glass powder is preferably used after silane treatment on the surface, and is usually used after silanization by an ordinary method using an organosilicon compound such as ⁇ -methacryloxypropyltrimethoxysilane as a surface treatment agent.
- the content of the inorganic filler having an average particle size of 0.01 ⁇ m or more and 0.04 ⁇ m or less is less than 0.1% by mass, it is difficult to obtain a sufficient thickening effect, whereas when the content exceeds 2% by mass.
- the resin paste at the time of preparation of the dental resin material becomes hard and air bubbles are easily mixed into the resin polymer.
- the content of the inorganic filler having an average particle size of 0.1 ⁇ m or more and 2 ⁇ m or less is less than 1% by mass, it is difficult to obtain sufficient wear resistance, whereas when it exceeds 80% by mass, a dental resin is obtained.
- the resin paste at the time of material preparation becomes hard and bubbles are likely to be mixed into the resin polymer, which is not suitable.
- the above-mentioned inorganic filler having an average particle size of 0.01 ⁇ m or more and 2 ⁇ m or less is mixed with a methacrylate or acrylate monomer having at least one unsaturated double bond, cured and pulverized.
- an organic-inorganic composite filler adjusted to an average particle size of 5 ⁇ m or more and 50 ⁇ m or less can be contained.
- the content of the organic-inorganic composite filler at this time is suitably 1% by mass or more and 40% by mass or less. When the content is less than 1% by mass, the effect of improving surface smoothness and wear resistance is not recognized. When it exceeds mass%, the mechanical strength decreases.
- an ultraviolet absorber a colorant, a polymerization inhibitor, etc. may be used as necessary.
- FIG. 1 shows a rectangular box-shaped mold 1 having a bottom 1a on one side.
- the shape is not particularly limited.
- And is pressurized in the range of 1.0 MPa or more and 8 MPa or less, and polymerized and cured by heating in the range of 60 ° C. or more and 200 ° C. or less when the pressurization is completed.
- the material constituting the mold is a material other than metal.
- synthetic resin as a material from the viewpoint of dimensional accuracy as a mold and moldability.
- thermoplastic resins and silicone resins More preferred are thermoplastic resins and silicone resins. This can greatly reduce the occurrence of cracks in the dental resin block produced.
- thermoplastic resin used resins that have been widely used in the general industry can be used. Among them, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl acetate, polytetrafluoroethylene, acrylonitrile butadiene styrene resin, acrylic Resin can be used.
- the step of pressing the mold and the material before curing injected into the mold at 1.0 MPa or more, and the step of heating the mold and the material before curing injected into the mold at 60 ° C. or more and 200 ° C. or less are made of metal.
- the composition is put into a mold that is not, and the whole mold is put into a container that can be set to a predetermined pressure, and is pressurized and heated to polymerize the pressure inside and outside the mold to be equal.
- a pressurized heating container such as an autoclave or a pressure cooker used in the industry can be used.
- an opening is provided in the mold, or, for example, in a concavo-convex mold, the composition is poured into the concave recess and the convex mold is placed in a floating state.
- pressure heating may be performed in the container as it is.
- a method may be used in which the composition is poured into a rectangular parallelepiped container having an open upper portion, and a thin resin film such as a wrap is placed on the upper surface of the composition from the upper surface opening port and heated under pressure.
- the applied pressure when the applied pressure is less than 1.0 MPa, mixing of bubbles is not sufficiently suppressed, and there is an increased possibility of generating bubbles that cause chipping. On the other hand, even if the applied pressure exceeds 8 MPa, the performance of the dental resin block itself is not affected, but no further improvement in the effect by increasing the applied pressure is recognized, and it is difficult to maintain the high pressure.
- the heating temperature if the heating temperature is less than 60 ° C, unpolymerized monomers may remain, which is not appropriate. However, the temperature is preferably 80 ° C. or higher from the viewpoint of improving productivity by avoiding a long polymerization time. On the other hand, when the temperature exceeds 200 ° C., the material of the packing used for the above-described pressurizing and heating containers is limited, which is not appropriate.
- a dental resin block with good moldability and few cracks and bubbles can be obtained.
- the shape of the block body is usually a rectangular parallelepiped or a cylindrical body, but it is preferable to make the shape approximate to the shape of the inlay or crown in advance because the amount of cutting during cutting can be reduced.
- a dental prosthesis is produced, for example, as follows using the dental resin block thus obtained.
- the upper and lower jaw impressions may be acquired simultaneously, or the upper and lower jaws may be acquired separately.
- a plaster model is prepared based on the obtained impression.
- the gypsum model is measured using a contact-type or non-contact-type measuring instrument to obtain three-dimensional coordinate data of the intraoral shape, and this is stored as a digital signal in a memory in the computer.
- the abutment tooth shape of the patient is graphically displayed on the CRT screen of the computer using a wire frame or the like.
- a certain reference point is set in advance on the upper and lower jaw plaster models, and the reference points are matched using the shape measurement data of the upper jaw plaster model and the shape measurement data of the lower jaw plaster model. More graphically reproduced on CRT.
- the dental resin block produced according to the present invention since there are few cracks and bubbles, problems such as chipping are hardly caused even during production, and a high-quality dental prosthesis can be produced.
- dental resin blocks according to Examples 1 to 4 and Comparative Examples 1 to 3 to be compared with these were manufactured and their quality was verified. This will be described below.
- ⁇ Dental resin material> four types of paste-like (uncured) dental resin materials 1 to 4 were prepared. Each paste was filled in a syringe so that it could be poured into a mold. In addition, the consistency of each paste was measured. The penetration (mm) measurement was performed as follows. That is, 1.0 mL of paste was extruded from a syringe onto cellophane and gently covered with cellophane, and then a cover glass having a total weight of 750 g and a weight were gently placed on the cellophane and allowed to stand for 60 seconds.
- Table 1 shows the composition and consistency of the paste.
- MPTS in Table 1 means ⁇ -methacryloxyprolyl triethoxysilane.
- Monomers 1 to 4 in Table 1 are as shown in Table 2 below.
- the abbreviations used in Table 2 mean the following chemical substances, respectively.
- UDMA Urethane dimethacrylate
- TEGDMA Triethylene glycol dimethacrylate
- BPO Benzoyl peroxide
- Bis-MEPP 2,2-bis (4-methacryloxypolyethoxyphenyl) propane
- HDMP 2-hydroxy-1,3-dimethacryloxypropane
- Example 1 a polypropylene sheet having a thickness of 1 mm was vacuum-formed to obtain a concave mold having a length and width of 12 mm ⁇ 14 mm and a depth of 20 mm.
- Paste 1 was gently poured into this concave mold to fill the interior without any gaps.
- the mold filled with paste 1 was fixed in an autoclave (manufactured by Kyoshin Engineering Co., Ltd.), and nitrogen with a concentration of 99.9% was replaced with 0.3 MPa three times to make the oxygen concentration less than 1.0%. Thereafter, the pressure was raised to 2.0 MPa with nitrogen, and the inside of the furnace was heated to 120 ° C. and polymerized and cured for 1 hour upon completion of the pressure raising. After 1 hour, the pressure was reduced to atmospheric pressure, the furnace was cooled to 60 ° C. or lower, the mold was taken out, and the polymerized dental resin block was extracted from the mold.
- Example 2 In Example 2, the same mold as in Example 1 was used, and the paste 2 was gently poured into this mold to fill the interior without any gaps.
- the mold filled with paste 2 was fixed in an autoclave (manufactured by Kyoshin Engineering Co., Ltd.), and nitrogen with a concentration of 99.9% was replaced with 0.3 MPa three times to make the oxygen concentration less than 1.0%. Thereafter, the pressure was increased to 3.0 MPa with nitrogen, and simultaneously with completion of the pressure increase, the temperature in the furnace was raised to 120 ° C. and polymerized and cured for 1 hour. After 1 hour, the pressure was reduced to atmospheric pressure, the furnace was cooled to 60 ° C. or lower, the mold was taken out, and the polymerized dental resin block was extracted from the mold.
- Example 3 a dummy block having a vertical and horizontal height of 12 mm ⁇ 14 mm ⁇ 18 mm was embedded in a fusion II wash type (GC Corporation), which is a dental silicone impression material. After curing, the dummy block was taken out to form a concave shape. Obtained. The paste 3 was gently poured into this concave mold to fill the interior without any gaps. The mold filled with paste 3 was fixed in an autoclave (manufactured by Kyoshin Engineering Co., Ltd.), and nitrogen with a concentration of 99.9% was replaced with 0.3 MPa three times to make the oxygen concentration less than 1.0%.
- GC Corporation fusion II wash type
- the pressure was increased to 3.0 MPa with nitrogen, and simultaneously with completion of the pressure increase, the temperature in the furnace was raised to 120 ° C. and polymerized and cured for 1 hour. After 1 hour, the pressure was reduced to atmospheric pressure, the furnace was cooled to 60 ° C. or lower, the mold was taken out, and the polymerized dental resin block was extracted from the mold.
- Example 4 In Example 4, the same mold as in Example 1 was used, and the paste 4 was gently poured into this mold to fill the interior without any gaps.
- the mold filled with the paste 4 was fixed in an autoclave (manufactured by Kyoshin Engineering Co., Ltd.), and nitrogen with a concentration of 99.9% was replaced with 0.3 MPa three times to make the oxygen concentration less than 1.0%. Thereafter, the pressure was increased to 4.0 MPa with nitrogen, and simultaneously with completion of the pressure increase, the temperature in the furnace was raised to 120 ° C. and polymerized and cured for 1 hour. After 1 hour, the pressure was reduced to atmospheric pressure, the furnace was cooled to 60 ° C. or lower, the mold was taken out, and the polymerized dental resin block was extracted from the mold.
- Example 3 Compared to Example 4, the pressure at which nitrogen was increased was 0.9 MPa. The rest is the same as in Example 4.
- Table 3 summarizes the main conditions of Examples 1 to 4 and Comparative Examples 1 to 3.
- the dental resin block obtained in each example was subjected to the following test.
- ⁇ Moldability> The removed dental resin block was free from voids and conformed to the inner shape of the mold, and it was confirmed that the shape was appropriate.
- ⁇ Cracks and bubbles> Ten plates obtained by slicing the extracted dental resin block to a thickness of 1 mm were observed with a 7-fold magnifier, and the presence or absence of cracks or bubbles was observed.
- ⁇ Bending strength> After a lapse of 24 hours or more from the polymerization, the dental resin block was cut out to have a thickness of 1.2 mm ⁇ 0.2 mm, a width of 4.0 mm ⁇ 0.2 mm, and a length of 14 mm or more. After equalizing with a number, a three-point bending test was performed under the conditions of a distance between fulcrums of 12 mm and a crosshead speed of 1.0 mm / min. The results are shown in Table 4.
- Example 1 the paste 1 before curing had a consistency of 68 mm and the highest fluidity.
- the moldability was good and cracks and bubbles were not confirmed, and a dental resin block having a uniform shape as obtained was obtained.
- the bending strength was as good as 234 MPa with respect to the filler amount of 64 mass% (silica powder 0.9 mass% + MPTS-treated aluminosilicate glass 63.1 mass%).
- Paste 2 before curing had a consistency of 53 mm and was relatively fluid. The moldability was good and cracks and bubbles were not confirmed, and a dental resin block having a uniform shape as obtained was obtained.
- the filler amount was as high as 218 MPa with respect to 70.8% by mass.
- the paste 3 before curing had a consistency of 47 mm and was relatively low in fluidity.
- the moldability was good and cracks and bubbles were not confirmed, and a dental resin block having a uniform shape as obtained was obtained.
- the filler amount was as good as 184 MPa with respect to 65.8% by mass.
- Example 4 the paste 4 before curing had a consistency of 30 mm and the lowest fluidity. The moldability was good and cracks and bubbles were not confirmed, and a dental resin block having a uniform shape as obtained was obtained. Regarding the bending strength, the filler amount was as good as 243 MPa with respect to 65.8% by mass.
- Comparative Example 1 was different from Example 1 in that the moldability was poor and a space was found. Furthermore, cracks were confirmed on the surface or inside of the dental resin block. However, no bubbles were observed inside the dental resin block. Since the moldability was poor and cracks were generated, it was not possible to prepare a test body for performing a bending test.
- Comparative Example 2 was different from Example 2 in that the moldability was poor and a space was found. Furthermore, cracks were confirmed on the surface or inside of the dental resin block. However, no bubbles were observed inside the dental resin block. Since the moldability was poor and cracks were generated, it was not possible to prepare a test body for performing a bending test.
- Comparative Example 3 unlike Example 4, many bubbles were confirmed inside the dental resin block. When the bending test was performed, the value was low because there were many bubbles.
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Abstract
Description
CAD/CAM装置における切削加工では形状を切り出す前の材料として、歯科用レジンをブロック状に形成した歯科用レジンブロックが用いられる。この歯科用レジンブロックは例えば、特許文献1に記載のように、平均粒径0.001μm以上0.04μm以下の無機質充填剤を20質量%以上70質量%以下の範囲で含有した材料からなるアクリル系レジン重合体をブロック状にしたものである。
用いられる熱可塑性樹脂は、従来から一般工業界にて広く用いられてきた樹脂を使用でき、中でもポリエチレン、ポリプロピレン、ポリ塩化ビニル、ポリスチレン、ポリ酢酸ビニル、ポリテトラフルオロエチレン、アクリロニトリルブタジエンスチレン樹脂、アクリル樹脂などが使用できる。
この容器としては、産業界で使用されているオートクレイブや圧力釜等の加圧加熱容器を用いることができる。この工程において型の内外の圧力が等しくなるようにする手段としては、型に開放口を設けておいたり、例えば凹凸の合わせ型において、凹型の凹部に組成物を注ぎ浮遊状態で凸型を乗せそのままで容器内で加圧加熱したりする等がある。また、上部が開放されている直方体容器に組成物を注ぎ上面開放口から組成物上面にラップ等の薄い樹脂製膜を乗せて加圧加熱する方法でもよい。
先ず歯科用印象材を用いて患者の口腔内の支台歯側、及び対合歯側の印象を採得する。上下顎の印象採得は同時印象採得でも良いし、上下顎別々に印象採得を行っても良い。
次に採得した印象に基づいて石膏模型を作製する。
そして、石膏模型を接触式又は非接触式の計測器を用いて計測して口腔内形状の三次元座標データを得、これをデジタル信号としてコンピュータ内のメモリに蓄積する。
その後、メモリに蓄積された三次元座標データを使用して、コンピュータのCRT画面上に患者の支台歯形状をワイヤーフレーム等を使用してグラフィック表示する。対合歯との位置関係は、予め上下顎の石膏模型に或る基準点を設けておき、上顎の石膏模型の形状測定データ、下顎の石膏模型の形状測定データを用い、基準点を合わせることよりCRTにグラフィックで再現する。
ここではペースト1から4の4種類のペースト状(未硬化)の歯科用レジン材料を準備した。各ペーストはシリンジに充填され、型に注入できるようにした。
また、各ペーストについてちょう度を測定した。ちょう度(mm)測定は次のように行った。すなわち、セロファンの上にシリンジからペーストを1.0mL押し出し、静かにセロファンを被せた後、総重量750gとしたカバーガラスと錘を静かに乗せ、60秒間静置した。60秒経過後にただちにカバーガラスと錘を外し、広がったペーストの長辺と短辺の長さを測定し、平均値をちょう度(mm)とした。
表1にペーストの組成及びちょう度を表した。表1中のMPTSは、γ-メタクリロキシプロリルトリエトキシシランを意味する。
UDMA:ウレタンジメタクリレート
TEGDMA:トリエチレングリコールジメタクリレート
BPO:ベンゾイルパーオキサイド
Bis-MEPP:2,2-ビス(4-メタクリロキシポリエトキシフェニル)プロパン
HDMP:2-ヒドロキシ-1,3-ジメタクリロキシプロパン
実施例1では、厚さ1mmのポリプロピレンシートを真空成型して、縦横が12mm×14mm、深さが20mmの凹型を得た。この凹型にペースト1を静かに注入して内部を隙間なく満たした。ペースト1が満たされた型をオートクレーブ(株式会社協真エンジニアリング製)内に固定し、濃度99.9%の窒素を0.3MPaで3回置換して酸素濃度を1.0%未満とした。
その後窒素で2.0MPaまで昇圧し、昇圧完了と同時に炉内を120℃に昇温させ1時間重合硬化させた。1時間経過後、圧力を大気圧まで降下させ、炉内が60℃以下に冷めてから型を取り出し、重合した歯科用レジンブロックを当該型から抜き取った。
実施例2では、実施例1と同じ型を用い、この型にペースト2を静かに注入して内部を隙間なく満たした。ペースト2が満たされた型をオートクレーブ(株式会社協真エンジニアリング製)内に固定し、濃度99.9%の窒素を0.3MPaで3回置換して酸素濃度を1.0%未満とした。
その後窒素で3.0MPaまで昇圧し、昇圧完了と同時に炉内を120℃に昇温させ1時間重合硬化させた。1時間経過後、圧力を大気圧まで降下させ、炉内が60℃以下に冷めてから型を取り出し、重合した歯科用レジンブロックを当該型から抜き取った。
実施例3では、縦横高さが12mm×14mm×18mmのダミーブロックを歯科用シリコーン印象材であるフュージョンIIウォッシュタイプ(株式会社ジーシー)にて包埋し、硬化後にこのダミーブロックを取り出して凹型を得た。この凹型にペースト3を静かに注入して内部を隙間なく満たした。ペースト3が満たされた型をオートクレーブ(株式会社協真エンジニアリング製)内に固定し、濃度99.9%の窒素を0.3MPaで3回置換して酸素濃度を1.0%未満とした。
その後窒素で3.0MPaまで昇圧し、昇圧完了と同時に炉内を120℃に昇温させ1時間重合硬化させた。1時間経過後、圧力を大気圧まで降下させ、炉内が60℃以下に冷めてから型を取り出し、重合した歯科用レジンブロックを当該型から抜き取った。
実施例4では、実施例1と同じ型を用い、この型にペースト4を静かに注入して内部を隙間なく満たした。ペースト4が満たされた型をオートクレーブ(株式会社協真エンジニアリング製)内に固定し、濃度99.9%の窒素を0.3MPaで3回置換して酸素濃度を1.0%未満とした。
その後窒素で4.0MPaまで昇圧し、昇圧完了と同時に炉内を120℃に昇温させ1時間重合硬化させた。1時間経過後、圧力を大気圧まで降下させ、炉内が60℃以下に冷めてから型を取り出し、重合した歯科用レジンブロックを当該型から抜き取った。
分解可能なアルミニウム製の型にペースト1を静かに注入して内部を隙間なく満たした。型の材質以外は実施例1と同じ条件で歯科用レジンブロックを製造した。
分解可能なステンレス(SUS303)製の型にペースト2を静かに注入して内部を隙間なく満たした。型の材質以外は実施例2と同じ条件で歯科用レジンブロックを製造した。
実施例4に対して、窒素で昇圧する圧力を0.9MPaとした。それ以外は実施例4と同じである。
<成型性>
取り出した歯科用レジンブロックをに空隙がなく型の内面形状に沿っており、形状が適正であるか確認した。
<亀裂・気泡>
取り出した歯科用レジンブロックを1mm厚にスライスして得られた10枚の板を7倍のルーペで観察し、亀裂や気泡の有無を観察した。
<曲げ強度>
重合から24時間以上経過した後、歯科用レジンブロックを厚さ1.2mm±0.2mm、幅4.0mm±0.2 mm、長さ14mm以上となるように切り出し、表面を耐水研磨紙1000番で均一化してから支点間距離12mm、クロスヘッドスピード1.0mm/分の条件で三点曲げ試験を行った。
結果を表4に示す。
Claims (1)
- 歯科用レジンブロックとなる硬化前の材料を、金属以外の材料により形成された型に注入する工程と、
前記型及び該型に注入された前記硬化前の材料を1.0MPa以上で加圧する工程と、
前記型及び該型に注入された前記材料を60℃以上で加熱する工程と、を含む、歯科用レジンブロックの製造方法。
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JP2014555878A JP5727112B1 (ja) | 2013-09-24 | 2014-08-22 | 歯科用レジンブロックの製造方法 |
CN201480032884.7A CN105283146B (zh) | 2013-09-24 | 2014-08-22 | 牙科用树脂块的制造方法 |
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DE102022116932A1 (de) | 2022-07-07 | 2024-01-18 | Voco Gmbh | Herstellung von dentalen Fräsrohlingen |
KR102589939B1 (ko) * | 2023-02-17 | 2023-10-16 | 송은영 | 불소 및 카프르산이 포함된 치과 절삭가공용 하이브리드 복합 레진블록의 제조방법 |
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JP5745198B2 (ja) | 2015-07-08 |
KR101870500B1 (ko) | 2018-06-22 |
JPWO2015045698A1 (ja) | 2017-03-09 |
HUE063227T2 (hu) | 2024-01-28 |
ES2954934T3 (es) | 2023-11-27 |
KR20160061912A (ko) | 2016-06-01 |
JP2015097854A (ja) | 2015-05-28 |
US20160128812A1 (en) | 2016-05-12 |
EP3050533B1 (en) | 2023-07-26 |
JP5727112B1 (ja) | 2015-06-03 |
CN105283146B (zh) | 2020-05-05 |
PL3050533T3 (pl) | 2023-12-11 |
EP3050533A4 (en) | 2017-05-10 |
CN105283146A (zh) | 2016-01-27 |
EP3050533A1 (en) | 2016-08-03 |
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