JP6509863B2 - 歯科用ミルブランク、その製造方法及び使用 - Google Patents
歯科用ミルブランク、その製造方法及び使用 Download PDFInfo
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- JP6509863B2 JP6509863B2 JP2016536697A JP2016536697A JP6509863B2 JP 6509863 B2 JP6509863 B2 JP 6509863B2 JP 2016536697 A JP2016536697 A JP 2016536697A JP 2016536697 A JP2016536697 A JP 2016536697A JP 6509863 B2 JP6509863 B2 JP 6509863B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 23
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 348
- 239000000463 material Substances 0.000 claims description 115
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- 238000000034 method Methods 0.000 claims description 59
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- 239000000919 ceramic Substances 0.000 claims description 29
- 238000003754 machining Methods 0.000 claims description 29
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 16
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 16
- VQCBHWLJZDBHOS-UHFFFAOYSA-N erbium(iii) oxide Chemical compound O=[Er]O[Er]=O VQCBHWLJZDBHOS-UHFFFAOYSA-N 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 14
- 238000003801 milling Methods 0.000 claims description 13
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- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
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- SCRZPWWVSXWCMC-UHFFFAOYSA-N terbium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Tb+3].[Tb+3] SCRZPWWVSXWCMC-UHFFFAOYSA-N 0.000 claims description 7
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 4
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- WVMPCBWWBLZKPD-UHFFFAOYSA-N dilithium oxido-[oxido(oxo)silyl]oxy-oxosilane Chemical compound [Li+].[Li+].[O-][Si](=O)O[Si]([O-])=O WVMPCBWWBLZKPD-UHFFFAOYSA-N 0.000 claims description 4
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- 229910000423 chromium oxide Inorganic materials 0.000 claims description 2
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- MMKQUGHLEMYQSG-UHFFFAOYSA-N oxygen(2-);praseodymium(3+) Chemical compound [O-2].[O-2].[O-2].[Pr+3].[Pr+3] MMKQUGHLEMYQSG-UHFFFAOYSA-N 0.000 claims description 2
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- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 16
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Classifications
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- A61C5/70—Tooth crowns; Making thereof
- A61C5/77—Methods or devices for making crowns
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- A61C8/0012—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the material or composition, e.g. ceramics, surface layer, metal alloy
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- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
- A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
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Description
重量%を多孔質ジルコニア材料の重量に対するものとして、前記多孔質ジルコニア材料が、
−ZrO2として計算される酸化ジルコニウムを、約80〜約97重量%、
−Al2O3として計算される酸化アルミニウムを、約0〜約0.15重量%、
−Y2O3として計算される酸化イットリウムを、約1〜約10重量%、
−Bi2O3として計算される酸化ビスマスを、約0.01〜約0.20重量%、
−Tb2O3として計算される酸化テルビウムを、約0.01〜約0.8重量%、
及び場合により以下の酸化物の1つ又は2つ、すなわち、
−Er2O3として計算される酸化エルビウムを、約0.01〜約3.0重量%、
−MnO2として計算される酸化マンガンを、約0.0001〜約0.08重量%、を含み、
前記多孔質ジルコニア材料が、Fe2O3として計算される酸化鉄を、約0.01重量%を上回る、又は約0.005を上回る、又は約0.001重量%を上回る量で含まない、歯科用ミルブランクに関する。
−それぞれの酸化物の粉末を混合して粉末混合物を得る工程と、
−前記粉末混合物を歯科用ミルブランクの形状にプレスする工程と、を含む方法にも関する。
−本文書に記載される多孔質ジルコニア材料を含む歯科用ミルブランクを提供する工程と、
−前記歯科用ミルブランクを機械加工装置に配置する工程と、
−前記多孔質ジルコニア材料を機械加工する工程と、を含む方法に関する。
(a)ヒステリシスループを有するN2吸着及び/又は脱着等温線を示すこと、
(b)IUPAC分類にしたがうIV型の等温線のN2吸着及び脱着及びヒステリシスループを示すこと、
(c)IUPAC分類にしたがうH1型ヒステリシスループを有するIV型のN2吸着及び脱着等温線を示すこと、
(d)0.70〜0.95のp/p0の範囲で、IUPAC分類にしたがうH1型ヒステリシスループを有するIV型のN2吸着及び脱着等温線を示すこと、
(e)平均連結孔径:約10〜約100nm、又は約10〜約80nm、又は約10〜約70nm、又は約10〜約50nm、又は約15〜約40nm、
(f)平均粒度:約100nm未満、又は約80nm未満、又は約60nm未満、又は約10〜約100、又は約15〜約60nm、
(g)BET表面:約10〜約200m2/g、又は約15〜約100m2/g、又は約16〜約60m2/g、
(h)2軸曲げ強度:約10〜約40、又は約15〜約30MPa、
(i)x、y、z寸法:少なくとも約5mm、又は少なくとも約10、又は少なくとも約20mm、
(j)ビッカース硬度:約25(HV 0.5)〜約150(HV 1)、又は約35〜約140(HV 1、の少なくとも1つ以上、場合によってはすべてを満たす。
−ZrO2として計算される酸化ジルコニウムを、約80〜約97重量%、又は約85〜約95重量%、
−Al2O3として計算される酸化アルミニウムを、約0〜約0.15重量%、又は約0〜約0.10重量%、
−Y2O3として計算される酸化イットリウムを、約1〜約10重量%、又は約4〜約8重量%、
−Bi2O3として計算される酸化ビスマスを、約0.01〜約0.20重量%、又は約0.03〜約0.15重量%、
−Tb2O3して計算される酸化テルビウムを、約0.01〜約0.8重量%、又は約0.01〜約0.05重量%、
及び上記の酸化物の1つ又は2つ、
−Er2O3として計算される酸化エルビウムを、約0.01〜約3.0重量%、又は約0.01〜約2.0重量%、
−MnO2として計算される酸化マンガンを、約0.0001〜約0.08重量%、又は約0.001〜約0.01重量%、
(ただし、重量%は、多孔質ジルコニア材料の重量に対するものである)。
○Fe2O3として計算される酸化鉄は、約0.01重量%未満、又は約0.001重量%未満、
○Cr2O3として計算される酸化クロムは、約0.01重量%未満、又は約0.001重量%未満、
○CuOとして計算される酸化銅は、約0.01重量%未満、又は約0.001重量%未満、
○V2O5として計算される酸化バナジウムは、約0.01重量%未満、又は約0.001重量%未満、
○Mo2O3として計算される酸化モリブデンは、約0.01重量%未満、又は約0.001重量%未満、
○Pr2O3として計算される酸化プラセオジムは、約0.01重量%未満、又は約0.001重量%未満、
(ただし、重量%は、多孔質ジルコニア材料の重量に対するものである)。
−材料中に含まれるそれぞれの酸化物の粉末を混合して粉末混合物を得る工程と、
−粉末混合物をプレスする工程と、を含むプロセスによって得ることができる。
a.2nm〜50nm、又は約2nm〜約30nm、又は約2nm〜約20nm、又は約2nm〜約15nmの範囲の平均一次粒度を有する結晶性粒子を含むこと、
b.粒子中の結晶性ジルコニアの含有量が少なくとも85mol%であること、
c.少なくとも3重量%、又は約3〜約10重量%の範囲内の有機含有量を有すること、
d.x、y、z寸法が、少なくとも約5、又は少なくとも約8、又は少なくとも約10、又は少なくとも約20mmであること。
●温度:約900〜約1100℃、又は約950〜約1090℃、約975〜約1080℃、
●雰囲気:空気又は不活性ガス(例えば、窒素、アルゴン)、
●持続時間:材料の最終密度の約40〜約60%の密度に達するまで。
●溶媒、Zr、Y、Bi、及びTbの酸化物の結晶性粒子、及び場合によりEr及びMnの酸化物を含むジルコニアゾルを提供する工程と、
●場合により、ジルコニアゾルを濃縮して、濃縮ジルコニアゾルを提供する工程と、
●ゾルを重合性有機マトリックスと混合する(例えば、ジルコニアゾルに反応性表面改質剤と、所望により、ジルコニアゾルの表面改質粒子を重合することができる開始剤とを加える)工程と、
●場合により、ジルコニアゾルを型に流し入れ、成形ジルコニアゾルを提供する工程と、
●ジルコニアゾルの重合性有機マトリックスを硬化させてゲルを形成する工程(しばしばゲル化工程と呼ばれる)と、
●ゲルから溶媒を除去することにより(例えば、最初に溶媒交換法によりゲルから水(存在する場合)を除去して少なくとも一部脱水されたゲルを得た後、残りの溶媒を、例えば超臨界抽出によって抽出する更なる抽出工程により)エアロゲルを提供する工程と、
●場合により、エアロゲルをより小さな塊に切り出す工程と、
●エアロゲルを加熱処理して、例えば機械加工可能な材料又は物品を得る工程と、を含む方法によって得ることができる。
%C/T=100(C/T)÷(C/T+M) (I)
−使用説明書、
−ミリングブランクを機械加工装置に可逆的に固定する又は取り付けるための手段又は保持装置、のいずれか、
又はこれらの組み合わせを含む部品のキットにも関する。
a)多孔質ジルコニア材料を含む歯科用ミルブランクを提供する工程と、
b)歯科用ミルブランクを機械加工装置の中に配置する工程と、
c)多孔質ジルコニア材料を機械加工して機械加工された多孔質ジルコニア歯科用物品を得る工程と、を含む。
−ミリングツールの回転速度:5,000〜40,000回転/分;
−供給速度:20〜5,000mm/分;
−ミリングカッター径:0.8〜4mm。
−温度:約900℃〜約1500℃、又は約1000℃〜約1400℃、又は1100℃〜1350℃、又は約1200℃〜約1400℃、又は約1300℃〜約1400℃、又は約1320℃〜約1400℃、又は約1340℃〜約1350℃、
−雰囲気:空気又は不活性ガス(例えば、窒素、アルゴン)、
−持続時間:材料の最終密度の約95%、又は約98%、又は約99〜約100%の密度に到達するまで、
−滞留時間:約1〜約24時間、又は約2〜約12時間、
−圧力:周囲気圧。
−密度:理論上の密度の少なくとも約98.5(実施形態によっては、99、99.5、99.9、又は更には少なくとも99.99)%の完全焼結密度、
−ビッカース硬度:約450MPa〜約2200MPa、又は約500MPa〜約1800MPa.HV(2)、
−相含量正方晶相:約1〜約100重量%、又は約10〜約100重量%、立方晶相:約30〜約100重量%、又は約50〜約90重量%、
−2軸曲げ強度:約450MPa〜約2200MPa、又は約500MPa〜約2000MPa、のうちの1つ以上を特徴とすることができる。
該多孔質ジルコニア材料が、重量%を多孔質ジルコニア材料の重量に対するものとして、
●ZrO2として計算される酸化ジルコニウムを、約80〜約97重量%、
●Al2O3として計算される酸化アルミニウムを、約0〜約0.15重量%、
●Y2O3として計算される酸化イットリウムを、約1〜約10重量%、
●Bi2O3として計算される酸化ビスマスを、約0.01〜約0.20重量%、
●Tb2O3として計算される酸化テルビウムを、約0.01〜約0.8重量%、
及び場合により以下の酸化物の1つ又は2つ、すなわち、
●Er2O3として計算される酸化エルビウムを、約0.01〜約3.0重量%、
●MnO2として計算される酸化マンガンを、約0.0001〜約0.01重量%、
を含み、
該多孔質ジルコニア材料が、
−ガラス、ガラスセラミック、又は二ケイ酸リチウム材料、及び
−Fe2O3として計算される酸化鉄を、約0.01重量%を上回る、又は約0.005重量%を上回る、又は約0.001重量%を上回る量で含まず、
前記多孔質ジルコニア材料が、以下のパラメータ、すなわち、
●0.70〜0.95のp/p0の範囲で、IUPAC分類にしたがうH1型ヒステリシスループを有するN2吸着及び脱着等温線を示すこと、
●BET表面:約10〜約200m2/g、
●2軸曲げ強度:約10〜約40MPa、
●x、y、z寸法:少なくとも約5mm、
●密度:理論密度の約30%〜約95%、
●収縮挙動:等方性、によって特徴付けられる、歯科用ミルブランク。
イオン濃度
所望される場合、イオンの濃度は、蛍光X線分光法(XRF)により決定できる。いくつかのXRF装置は、液体溶液中のイオン濃度を直接測定する機会を提供し、例えば日本の株式会社リガク製ZSX Primus IIなどがある。
蛍光特性は、以下の部品、すなわち、光源として、波長約409nmの光を照射するGC America G−Light、積分球、光伝導体としてTopsensor Systemsより販売される光ファイバー、及びA/Dコンバータ、を含む光学的装置(鋭い発光バンドに特に適している)を使用して測定することができる。ディスク形状(直径>10mm、厚さ1.0mm)を有する試料を使用して、積分球の開口部を覆うことができる。励起放射線(exitation radiation)(紫光)によって試料を透視する間に、試料の発光スペクトルを測定することができる。より短波長の励起放射線も、蛍光測定に適する。
所望される場合、平均粒度は、直線切片分析を用いて決定することができる。70,000倍の倍率を有するFESEM顕微鏡写真が、粒度測定に使用される。焼結本体の異なる区域から撮られた3枚又は4枚の顕微鏡写真を、各試料について使用する。各顕微鏡写真の高さに対してほぼ等しい間隔で離れて配置される10本の水平線を引く。各直線上で観察した粒界切片の数を計数し、これを用いて切片間の平均距離を算定する。各直線についての平均距離に1.56を乗じて粒度を決定し、この値を、各試料のすべての顕微鏡写真のすべての直線にわたって平均する。
所望される場合、焼結された材料の密度は、アルキメデス技法により測定することができる。この測定は、密度測定キット(Mettler Instrument Corp.から「ME 33360」の名称)を用いて、精密天びん(Mettler Instrument Corp.,Hightstown,NJから「AE 160」の名称)上で行われる。この手法で、まずは試料を空気中で計量し(A)、次に水に浸漬する(B)。水を蒸留し、脱イオン化させる。湿潤剤(Dow Chemical Co.,Danbury,CTから商品名「TERGITOL−TMN−6」として入手)の1滴を水250mLに加える。密度は、式ρ=(A/(A−B))ρ0を用いて算出される(式中、ρ0は水の密度である)。相対密度は、材料の理論密度(ρt)を参照することにより、算出することができる(ρrel=(ρ/ρt)100)。
所望される場合、ビッカース硬度は、以下の修正を加えて、ISO 843−4に従って決定することができる。試料の表面を、炭化ケイ素研磨紙(P400及びP1200)を使用して研削する。試験荷重を、試料の硬度レベルに調整する。使用された試験荷重は、0.2kg〜2kgであり、それぞれの凹部に15秒間適用された。最小限10個の凹部を測定して、平均ビッカース硬度を決定する。試験は、硬度計Leco M−400−G(Leco Instrumente GmbH)で実施することができる。
必要に応じて、2軸曲げ強度は、以下の修正を加えて、ISO 6872(2008)に従って測定することができる。すなわち、乾式又は湿式カットソーを用いて、試料を1〜2mmの厚さのウエハに切断する。試料の直径は、12mm〜20mmでなければならない。各ウエハを支持直径14mmとなるように3個の鋼球の支持体上に中心を合わせて置く。ウエハと接触するパンチ直径は3.6mmである。パンチを0.1mm/分の速度でウエハに対して押しつける。最低でも6個の試料を測定して平均強度を求める。この試験は、Instron 5566汎用試験機(Instron Deutschland GmbH)で実施することができる。
酸化ジルコニウム(92.3重量%、ZrO2として計算)、Y2O3として計算した酸化イットリウム(7.10重量%)、Er2O3として計算した酸化エルビウム(0.41重量%)、Tb2O3として計算した酸化テルビウム(0.11重量%)、Bi2O3として計算した酸化ビスマス(0.066重量%)、MnO2として計算した酸化マンガン(0.00038重量%)を含むゾル組成物は、各金属酢酸塩を使用することにより、ホットチューブ反応器によって調製した。
99.109重量%の酸化ジルコニウム(ZrO2として計算)、0.574重量%の酸化エルビウム(Er2O3として計算)、0.250重量%の酸化テルビウム(Tb4O7として計算)、0.066重量%の酸化ビスマス(Bi2O3として計算)及び0.00081重量%の酸化マンガン(MnO2として計算)の計算された組成物を得るため、結合されたZrO2粉末(TZP)、ZrO2/Er2O3粉末混合物(2.18重量%のEr2O3粉末)、Tb4O7粉末、Bi2O3粉末、及びZrO2/MnO2粉末混合物(0.035重量%のMnO2粉末)を激しく振盪して混合してから、200MPaの圧力を加えることによって円筒状のブロックにプレスした。ブロックの結合剤を除去し、予備焼結し、ディスクにスライスしてから完全密度となるまで焼結した。
99.466重量%の酸化ジルコニウム(ZrO2として計算)、0.346重量%の酸化エルビウム(Er2O3として計算)、0.028重量%の酸化鉄(Fe2O3として計算)、0.159重量%の酸化ビスマス(Bi2O3として計算)及び0.00120重量%の酸化マンガン(MnO2として計算)の計算された組成物を得るため、結合されたZrO2粉末(TZP)、ZrO2/Er2O3粉末混合物(11.435重量%のEr2O3粉末)、ZrO2/Fe2O3粉末混合物(1.435重量%のFe2O3粉末)、ZrO2/Bi2O3粉末混合物(0.224重量%のBi2O3粉末)及びZrO2/MnO2粉末混合物(0.33重量%のMnO2粉末)を激しく振盪して混合してから、円筒状のブロックにプレスした。ブロックの結合剤を除去し、予備焼結し、ディスクにスライスしてから完全密度となるまで焼結した。
上記の比較例と同程度の量の鉄による色付け及びビスマスドーピングを有するジルコニア材料は、鉄濃度が、Vita(商標)ClassicalスケールでA1又はそれよりも高い(例えばA3、B3)歯の色をもたらすようなレベルだと、歯科用途に十分な蛍光性を示さなかった。これと比較して、テルビウムによる色付け及びビスマスドーピングでは、高い蛍光度を維持しながらより暗い色(例えばVita(商標)ClassicalスケールでB3の歯の色)を生じることができた。
Claims (12)
- 多孔質ジルコニア材料を含み、機械加工装置に取り付けるか又は固定することを可能と
する形状を有する歯科用ミルブランクであって、
重量%を前記多孔質ジルコニア材料の重量に対するものとして、前記多孔質ジルコニア
材料が、以下の酸化物、すなわち、
○ZrO2として計算される酸化ジルコニウムを、80〜97重量%、
○Al2O3として計算される酸化アルミニウムを、0〜0.15重量%、
○Y2O3として計算される酸化イットリウムを、1〜10重量%、
○Bi2O3として計算される酸化ビスマスを、0.01〜0.20重量%、
○Tb2O3として計算される酸化テルビウムを、0.01〜0.8重量%、
及び場合により以下の酸化物の1つ又は2つ、すなわち、
○Er2O3として計算される酸化エルビウムを、0.01〜3.0重量%、
○MnO2として計算される酸化マンガンを、0.0001〜0.08重量%、含
み、
前記多孔質ジルコニア材料が、Fe2O3として計算される酸化鉄を、0.01重量
%を上回る量で含まない、歯科用ミルブランク。 - 前記多孔質ジルコニア材料が、以下のパラメータ、すなわち、
○ヒステリシスループを有する窒素の吸着及び脱着等温線を示すこと、
○IUPAC分類にしたがうH1型のヒステリシスループを示すこと、
○0.70〜0.95のp/p0の範囲でヒステリシスループを有するN2吸着及び脱
着等温線を示すこと、
○平均連結孔径:10〜100nm、
○平均粒度:100nm未満、
○BET表面:10〜200m2/g、
○2軸曲げ強度:10〜40MPa、
○x、y、z寸法:少なくとも5mm、
○ビッカース硬度:25〜150、
○密度:理論密度の30%〜95%、
○収縮挙動:等方性、の少なくとも1つ又はすべてによって特徴付けられる、請求項1
に記載の歯科用ミルブランク。 - ディスク又はブロックの形状を有する、請求項1又は2に記載の歯科用ミルブランク。
- 重量%を前記多孔質ジルコニア材料の重量に対するものとして、以下の成分、すなわち
、
○0.005重量%を上回る量の、Fe2O3として計算される酸化鉄、
○0.01重量%を上回る量の、Cr2O3として計算される酸化クロム、
○0.01重量%を上回る量の、CuOとして計算される酸化銅、
○0.01重量%を上回る量の、V2O5として計算される酸化バナジウム、
○0.01重量%を上回る量の、Mo2O3として計算される酸化モリブデン、
○0.01重量%を上回る量の、Pr2O3として計算される酸化プラセオジム、の
少なくとも1つ又はすべてを含まない、請求項1〜3のいずれか一項に記載の歯科用ミル
ブランク。 - 以下の成分、すなわち、
○ガラス、
○ガラスセラミック、
○二ケイ酸リチウムセラミック、
又は、これらの組み合わせ若しくは混合物、の少なくとも1つ又はすべてを含まない、
請求項1〜4のいずれか一項に記載の歯科用ミルブランク。 - 機械加工装置に前記歯科用ミルブランクを可逆的に取り付けるための手段又は保持装置
を含み、前記手段が、1乃至複数の溝、1乃至複数の切欠き部、1乃至複数の陥凹部、1
乃至複数の打ち抜き部、1乃至複数のフレーム、1乃至複数の残根部及びこれらの組み合
わせから選択される、請求項1〜5のいずれか一項に記載の歯科用ミルブランク。 - ブロック又はディスクの形状を有する前記歯科用ミルブランクであって、多孔質ジルコ
ニア材料と、前記歯科用ミルブランクを機械加工装置に取り付けるための手段とを含み、
重量%を前記多孔質ジルコニア材料の重量に対するものとして、前記多孔質ジルコニア
材料が、
●ZrO2として計算される酸化ジルコニウムを、80〜97重量%、
●Al2O3として計算される酸化アルミニウムを、0〜0.15重量%、
●Y2O3として計算される酸化イットリウムを、1〜10重量%、
●Bi2O3として計算される酸化ビスマスを、0.01〜0.20重量%、
●Tb2O3として計算される酸化テルビウムを、0.01〜0.8重量%、
及び場合により以下の酸化物の1つ又は2つ、すなわち、
●Er2O3として計算される酸化エルビウムを、0.01〜3.0重量%、
●MnO2として計算される酸化マンガンを、0.0001〜0.01重量%、を
含み、
前記多孔質ジルコニア材料が、
−ガラス、ガラスセラミック、又は二ケイ酸リチウム材料、及び
−0.01重量%を上回る量の、Fe2O3として計算される酸化鉄、を含まず、
前記多孔質ジルコニア材料が、以下のパラメータ、すなわち、
●0.70〜0.95のp/p0の範囲で、IUPCA分類にしたがうH1型ヒステリ
シスループを有するN2吸着及び脱着等温線を示すこと、
●BET表面:10〜200m2/g、
●2軸曲げ強度:10〜40MPa、
●x、y、z寸法:少なくとも5mm、
●密度:理論密度の30%〜95%、
●収縮挙動:等方性、によって特徴付けられる、請求項1〜6のいずれか一項に記載の
歯科用ミルブランク。 - 請求項1〜7のいずれか一項に記載の歯科用ミルブランクの製造方法であって、
○それぞれの酸化物の粉末を混合して粉末混合物を得る工程と、
○前記粉末混合物をプレスする工程と、を含む製造方法。 - 請求項1〜7のいずれか一項に記載の歯科用ミルブランクの製造方法であって、ジ
ルコニアエアロゲルを熱処理又は焼成する工程を含む、製造方法。 - 歯科用物品の製造方法であって、
○請求項1〜6のいずれか一項に記載の多孔質ジルコニア材料を含む歯科用ミルブラン
クを提供する工程と、
○前記歯科用ミルブランクを機械加工装置に配置する工程と、
○前記多孔質ジルコニア材料を機械加工する工程と、を含む製造方法。 - 前記機械加工する工程が、ミリング加工、ドリル加工、切断、カービング、又は研削の
装置によって行われる、請求項10に記載の製造方法。 - 前記機械加工された多孔質ジルコニア材料を焼結する更なる工程を含む、請求項10又
は11に記載の製造方法。
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JP2016540772A (ja) | 2016-12-28 |
CN105792773A (zh) | 2016-07-20 |
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RU2698021C1 (ru) | 2019-08-21 |
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CN105792773B (zh) | 2019-05-10 |
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