High-strength glass-ceramic containing anorthite crystals and process for producing the same
First Claim
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1. A high-strength glass-ceramic having a composition consisting essentially of anorthite crystals and consisting essentially of, in % by weight,8 to 26% MgO;
- 18 to 43% CaO;
25 to 40% SiO2 ;
10 to 25% P2 O5 ;
10.1 to 25% Al2 O3 ;
0 to 3% F2 ;
0 to 10% Li2 O;
0 to 10% Na2 O;
0to 10% K2 O;
0 to 10% B2 O3 ;
0 to 10% TiO2 ;
0 to 10% SrO;
0 to 10% Nb2 O5 ;
0 to 10% Ta2 O5 ; and
0 to 10% ZrO2 ;
the total amounts of MgO, CaO, SiO2, P2 O5, Al2 O3 and F2 being at least 90%.
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Abstract
A high-strength glass-ceramic containing apatite crystals or β-tricalcium phosphate crystals, and anorthite crystals, and a process for producing the same are disclosed. The glass-ceramic has an excellent biocompatibility and is useful as an implant material such as an artificial dental root and an artificial bone.
49 Citations
5 Claims
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1. A high-strength glass-ceramic having a composition consisting essentially of anorthite crystals and consisting essentially of, in % by weight,
8 to 26% MgO; -
18 to 43% CaO; 25 to 40% SiO2 ; 10 to 25% P2 O5 ; 10.1 to 25% Al2 O3 ; 0 to 3% F2 ; 0 to 10% Li2 O; 0 to 10% Na2 O; 0to 10% K2 O; 0 to 10% B2 O3 ; 0 to 10% TiO2 ; 0 to 10% SrO; 0 to 10% Nb2 O5 ; 0 to 10% Ta2 O5 ; and 0 to 10% ZrO2 ; the total amounts of MgO, CaO, SiO2, P2 O5, Al2 O3 and F2 being at least 90%.
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2. A high-strength glass-ceramic consisting essentially of apatite crystals and anorthite crystals, and having a composition consisting essentially of, in % by weight,
8 to 26% MgO; -
18 to 43% CaO; 25 to 40% SiO2 ; 10 to 25% P2 O5 ; 10.1 to 25% Al2 O3 ; 0.5 to 3% F2 ; 0 to 10% Li2 O; 0 to 10% Na2 O; 0 to 10% K2 O; 0 to 10% B2 O3 ; 0 to 10% TiO2 ; 0 to 10% SrO; 0 to 10% Nb2 O5 ; 0 to 10% Ta2 O5 ; and 0 to 10% ZrO2 ; the total amount of MgO, CaO, SiO2, P2 O5, Al2 O3 and F2 being at least 90%. - View Dependent Claims (3, 4)
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5. A high-strength glass-ceramic consisting essentially of β
- -tricalcium phosphate crystals, anorthite crystals and crystals of at least one from the group consisting of diopside, forsterite and akermanite and having a composition consisting essentially of, in % by weight,
8 to 26% MgO; 18 to 43% CaO; 25 to 40% SiO2 ; 10 to 25% P2 O5 ; 10.1 to 25% Al2 O3 ; 0 to 10% Li2 O; 0 to 10% Na2 O; 0 to 10% K2 O; 0 to 10% B2 O3 ; 0 to 10% TiO2 ; 0 to 10% ZrO2 ; 0 to 10% SrO; 0 to 10% Nb2 O5 ; and 0 to 10% Ta2 O5, the total amounts of MgO, CaO, SiO2, P2 O5 and Al2 O3 being at least 90%.
- -tricalcium phosphate crystals, anorthite crystals and crystals of at least one from the group consisting of diopside, forsterite and akermanite and having a composition consisting essentially of, in % by weight,
Specification
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Current AssigneeHoya Corporation
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Original AssigneeHoya Corporation
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InventorsKasuga, Toshihiro, Nakagawa, Kenji
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Primary Examiner(s)BELL, MARK LEE
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Application NumberUS06/804,517Time in Patent Office440 DaysField of Search501/5, 501/8, 501/10US Class Current501/8CPC Class CodesA61F 2/28 Bones joints A61F2/30A61F 2310/00293 containing a phosphorus-con...A61K 6/58 specially adapted for denta...A61K 6/807 comprising magnesium oxideA61K 6/816 comprising titanium oxideA61K 6/818 comprising zirconium oxideA61K 6/824 comprising transition metal...A61K 6/833 Glass-ceramic compositesA61L 27/12 Phosphorus-containing mater...C03C 10/0009 containing silica as main c...C03C 10/16 Halogen containing crystall...C03C 4/0007 for biologically-compatible...
