US4789649A
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Micaceous-cordierite-glass ceramic
Assignee: VEB JENAER GLASWERK A CORP OF GERMANY
•
Filing: 1986-08-08
•
Granted: 1988-12-06
•
Expires: 2006-08-08
Abstract
Abstract Micaceous-cordierite-glass ceramic particularly suitable for stomatological, head surgery and neck surgery applicatiosn has a fracture toughness KIC of up to 2.0 MPa m1/2, a hardness HV0.07 of 300-1000, a compressive strength of up to 450 N/mm2, a linear thermal expansion coefficient of 75-125x10-7 K-1, good chemical stability and excellent machinability as well as a high resistance to wear and comprises a composition in weight percentages of -SiO2 43-50 -Al2O3 26-30 -MgO 11-15 -R2O 7-10.5 -F- 3.3-4.8 -Cl- 0.01-0.6 -CaO 0.1-3 -P2O5 0.1-5 - wherein R2O is the sum of 3 to 5.5 wt. % Na2O and 4 to 6 wt. % K2O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume % cordierite, wherein relatively large mica crystals of 10 to 200 mu m are embedded in the glass and cordierite crystals of 0.5 to 5 mu m are arranged in the glass.
Inventors
- 👤 Christine Abert
- 👤 Eggert Beleites
- 👤 Gunter Carl
- 👤 Steffen Grosse
- 👤 Hilmar Gudziol
- 👤 Wolfram Hoeland
- 👤 Michael Hopp
- 👤 Ralf Jacobi
- 👤 Harry Jungto
- 👤 Guenther Knak
- 👤 Lutz Kreisel
- 👤 Rudolf Musil
- 👤 Karin Naumann
- 👤 Frank Vogel
- 👤 Werner Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:45
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/10; A61L27/105; A61F; A61F2/00; A61F2/02; A61F2/28; A61K; A61K6/00; A61K6/15; A61K6/16; A61K6/70; A61K6/78; A61K6/80; A61K6/802; A61K6/807; A61K6/831; A61K6/833; A61L27/12; C; C03; C03C; C03C10/00; C03C10/16; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00185; A61F2310/00203; A61F2310/00293
Claims Analysis
Total Claims: 56
Claim 1
Independent Claim
163 words
Micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 MPa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion, comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 82 m are arranged in the glass ceramic.
Claim 2
Dependent Claim
163 words
Micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 MPa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion, comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 82 m are arranged in the glass ceramic.
Claim 3
Dependent Claim
22 words
Micaceous-cordierite-glass ceramic according to claim 1, further comprising relatively smaller, flat mica of 0.5 to 5 μm embedded in the glass ceramic.
Claim 4
Dependent Claim
27 words
Micaceous-cordierite-glass ceramic according to claim 1, further comprising up to 8 wt-% of a component selected from the group consisting of BaO, SrO, PbO, and mixtures thereof.
Claim 5
Dependent Claim
16 words
Micaceous-cordierlite-glass ceramic according to claim 1, further comprising up to 4 wt-% of a pigment component.
Claim 6
Dependent Claim
38 words
Micaceous-cordierite-glass ceramic according to claim 4, wherein the pigment component is selected from the group consisting of NiO, Cr 2 O 3 , MnO 2 , FeO, Fe 2 O 3 , TiO 2 , and mixtures thereof.
Claim 7
Dependent Claim
195 words
A stomatological composition for inlays, crowns, structures and bridges, especially of a lateral tooth area, comprising a high-strength base body; and a micaceous-cordierite-glass ceramic at least partially enclosing said high-strength base body, said micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 MPa m 178 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K 1 , good chemical stability and excellent machineability as well as high resistance to abrasion and comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.01-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 um are arranged in the glass ceramic.
Claim 8
Dependent Claim
195 words
A stomatological composition for inlays, crowns, structures and bridges, especially of a lateral tooth area, comprising a high-strength base body; and a micaceous-cordierite-glass ceramic at least partially enclosing said high-strength base body, said micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 MPa m 178 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K 1 , good chemical stability and excellent machineability as well as high resistance to abrasion and comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.01-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 um are arranged in the glass ceramic.
Claim 9
Dependent Claim
29 words
A stomatological composition according to claim 6, wherein said high-strength base body is selected from the group consisting of Al 2 O 3 vitrified ceramic, vitrified corundum and metals.
Claim 10
Dependent Claim
16 words
A stomatological composition according to claim 6, having an external shape conforming to required anatomical characteristics.
Claim 11
Dependent Claim
25 words
A stomatological composition according to claim 6, further comprising a fracture bending strength of 200 to 400 MPa and a roughness depth of 0.15 μm.
Claim 12
Dependent Claim
19 words
A stomatological composition according to claim 6, further comprising a fixation cement for interconnecting the composition to a tooth.
Claim 13
Dependent Claim
21 words
A stomatological composition according to claim 6, further comprising a compound material for silanizing the composition for interconnection to a tooth.
Claim 14
Dependent Claim
27 words
A stomatological composition according to claim 6, wherein said micaceous-cordierite-glass ceramic further comprises relatively smaller, flat mica of 0.5 to 5 μm embedded in the glass ceramic.
Claim 15
Dependent Claim
32 words
A stomatological composition according to claim 6, wherein said micaceous-cordierite-glass ceramic further comprises up to 8 wt-% of a compound selected from the group consisting of BaO, SrO, PbO, and mixtures thereof.
Claim 16
Dependent Claim
21 words
A stomatological composition according to claim 6, wherein said micaceous-cordierite-glass ceramic further comprises up to 4 wt-% of a pigment component.
Claim 17
Dependent Claim
39 words
A stomatological composition according to claim 14, wherein said pigment component is selected from the group consisting of NiO, Cr 2 O 3 , MnO 2 , FeO, Fe 2 O 3 , TiO 2 , and mixtures thereof.
Claim 18
Dependent Claim
212 words
A veneer laminate for the facing of teeth made of synthetic resin, metal frames, or natural teeth, comprising a vestibulary layer of a micaceous-cordierite-glass ceramic, an oral layer of an organic synthetic material or compound material, and an adhesion, facilitator layer interconnecting said vestibulary and oral layers, wherein said micaceous-cordierite-glass cereamic has a fracture toughness K IC of up to 2.0 MPa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion and comprises a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic.
Claim 19
Dependent Claim
212 words
A veneer laminate for the facing of teeth made of synthetic resin, metal frames, or natural teeth, comprising a vestibulary layer of a micaceous-cordierite-glass ceramic, an oral layer of an organic synthetic material or compound material, and an adhesion, facilitator layer interconnecting said vestibulary and oral layers, wherein said micaceous-cordierite-glass cereamic has a fracture toughness K IC of up to 2.0 MPa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion and comprises a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic.
Claim 20
Dependent Claim
36 words
A veneer laminate according to claim 16, wherein the vestibulary layer has a thickness generally equal to or less than 0.5 mm and a thickness in the area of an incisal edge greater than 0.5 mm.
Claim 21
Dependent Claim
22 words
A veneer laminate according to claim 16, further comprising at least one surface-enlarging structure on an oral side of the vestibulary layer.
Claim 22
Dependent Claim
27 words
A veneer laminate according to claim 16, wherein said micaceous-cordierite-glass ceramic further comprises relatively smaller, flat mica of 0.5 to 5 μm embedded in the glass ceramic.
Claim 23
Dependent Claim
32 words
A veneer laminate according to claim 16, wherein said micaceous-cordierite-glass ceramic further comprises up to 8 wt-% of a component selected from the group consisting of BaO, SrO, PbO, and mixtures thereof.
Claim 24
Dependent Claim
21 words
A veneer laminate according to claim 16, wherein said micaceous-cordierite-glass ceramic further comprises up to 4 wt-% of a pigment component.
Claim 25
Dependent Claim
39 words
A veneer laminate according to claim 21, wherein said pigment component is selected from the group consisting of NiO, Cr 2 O 3 , MnO 2 , FeO, Fe 2 O 3 , TiO 2 , and mixtures thereof.
Claim 26
Dependent Claim
226 words
Micaceous-cordierite-glass ceramic for stomatological purposes having a fracture toughness K IC of up to 2.0 MPa m 1/2 , an adjustable hardness HV 0 .07 of 300-800, a compressive strength of up to 450 N/mm 2 , an adjustable linear thermal expansion coefficient of 80 to 120×10 -7 K -1 , good chemical stability, excellent machineability, a high resistance to abrasion, a bending fracture strength of more than 80 MPa, a hydrolytic stability of class 1 or 2, a roughness depth of 0.15 μm and X-ray opacity, comprising a compositon of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic, and wherein properties of the glass ceramic can be adjusted to the properties of natural tooth enamel, to provide a glass ceramic useful for inlays, crowns, structures and bridges, especially of a lateral tooth area.
Claim 27
Dependent Claim
226 words
Micaceous-cordierite-glass ceramic for stomatological purposes having a fracture toughness K IC of up to 2.0 MPa m 1/2 , an adjustable hardness HV 0 .07 of 300-800, a compressive strength of up to 450 N/mm 2 , an adjustable linear thermal expansion coefficient of 80 to 120×10 -7 K -1 , good chemical stability, excellent machineability, a high resistance to abrasion, a bending fracture strength of more than 80 MPa, a hydrolytic stability of class 1 or 2, a roughness depth of 0.15 μm and X-ray opacity, comprising a compositon of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic, and wherein properties of the glass ceramic can be adjusted to the properties of natural tooth enamel, to provide a glass ceramic useful for inlays, crowns, structures and bridges, especially of a lateral tooth area.
Claim 28
Dependent Claim
19 words
A micaceous-cordierite-glass ceramic according to claim 23, having an external shape conforming to required anatomical characteristics for stomatological purposes.
Claim 29
Dependent Claim
19 words
A micaceous-cordierite-glass ceramic according to claim 23, further comprising a fixation cement for interconnecting the composition to a tooth.
Claim 30
Dependent Claim
21 words
A micaceous-cordierite-glass ceramic according to claim 23, further comprising a compound material for silanizing the composition for interconnection to a tooth.
Claim 31
Dependent Claim
23 words
Micaceous -cordierite-glass ceramic according to claim 23, further comprising relatively smaller, flat mica of 0.5 to 5 μm embedded in the glass ceramic.
Claim 32
Dependent Claim
27 words
Micaceous-cordierite-glass ceramic according to claim 23, further comprising up to 8 wt-% of a component selected from the group consisting of BaO, SrO, PbO, and mixtures thereof.
Claim 33
Dependent Claim
16 words
Micaceous-cordierlite-glass ceramic according to claim 23, further comprising up to 4 wt-% of a pigment component.
Claim 34
Dependent Claim
38 words
Micaceous-cordierite-glass ceramic according to claim 29, wherein the pigment component is selected from the group consisting of NiO, Cr 2 O 3 , MnO 2 , FeO, Fe 2 O 3 , TiO 2 , and mixtures thereof.
Claim 35
Dependent Claim
282 words
Micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 Mpa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion, comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic, wherein said micaceous-cordierite-glass ceramic is formed in the shape of an adhesive bracket for application in dental orthopedics and orthodontics, said bracket comprising a wall thickness of at least 1 mm, a maximum height of 3 mm, a bottom portion having a length of 2.5 to 6 mm and a top wing portion, said bottom portion having a roughness of more than 5 μm, said bracket being provided with a slit having a width of 0.45 to 0.55 mm and a depth of 0.63 to 0.71 mm and extending in the direction of the length of said bottom portion, said glass ceramic adhesive bracket being machineable during clinical utilization so as to be fitted to the anatomy of a tooth.
Claim 36
Dependent Claim
282 words
Micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 Mpa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion, comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic, wherein said micaceous-cordierite-glass ceramic is formed in the shape of an adhesive bracket for application in dental orthopedics and orthodontics, said bracket comprising a wall thickness of at least 1 mm, a maximum height of 3 mm, a bottom portion having a length of 2.5 to 6 mm and a top wing portion, said bottom portion having a roughness of more than 5 μm, said bracket being provided with a slit having a width of 0.45 to 0.55 mm and a depth of 0.63 to 0.71 mm and extending in the direction of the length of said bottom portion, said glass ceramic adhesive bracket being machineable during clinical utilization so as to be fitted to the anatomy of a tooth.
Claim 37
Dependent Claim
16 words
A micaceous-cordierite-glass ceramic according to claim 31, wherein said bottom portion has an arched bottom surface.
Claim 38
Dependent Claim
15 words
A micaceous-cordierite-glass ceramic according to claim 31, wherein said top wing portion has bevelled edges.
Claim 39
Dependent Claim
52 words
A micaceous-cordierite-glass ceramic according to claim 31, wherein said slit is metal and traverses the top wing portion with respect to the length of the bottom portion at an angulation of up to 10° and a torque angle with respect to a plane perpendicular to the bottom portion of up to 25°.
Claim 40
Dependent Claim
22 words
Micaceous-cordierite-glass ceramic according to claim 31, further comprising relatively smaller, flat mica of 0.5 to 5 μm embedded in the glass ceramic.
Claim 41
Dependent Claim
27 words
Micaceous-cordierite-glass ceramic according to claim 31, further comprising up to 8 wt-% of a component selected from the group consisting of BaO, SrO, PbO, and mixtures thereof.
Claim 42
Dependent Claim
16 words
Micaceous-cordierite-glass ceramic according to claim 31, further comprising up to 4 wt-% of a pigment component.
Claim 43
Dependent Claim
38 words
Micaceous-cordierite-glass ceramic according to claim 37, wherein the pigment component is selected from the group consisting of NiO, Cr 2 O 3 , MnO 2 , FeO, Fe 2 O 3 , TiO 2 , and mixtures thereof.
Claim 44
Dependent Claim
245 words
Micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 MPa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion, comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic, and wherein said micaceous-cordierite-glass ceramic is formed in the shape of an adhesive button for application in dental orthopedics and orthodontics, said button comprising a wall thickness of at least 1 mm, a maximum height of 3 mm and a base portion having base edges each measuring 2.5 to 3 mm, said base portion having a roughness of more than 5 μm, and said ceramic adhesive button being workable during clinical utilization so as to be fitted to the anatomy of a tooth.
Claim 45
Dependent Claim
245 words
Micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 MPa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion, comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic, and wherein said micaceous-cordierite-glass ceramic is formed in the shape of an adhesive button for application in dental orthopedics and orthodontics, said button comprising a wall thickness of at least 1 mm, a maximum height of 3 mm and a base portion having base edges each measuring 2.5 to 3 mm, said base portion having a roughness of more than 5 μm, and said ceramic adhesive button being workable during clinical utilization so as to be fitted to the anatomy of a tooth.
Claim 46
Dependent Claim
15 words
A micaceous-cordierite-glass ceramic according to claim 39, wherein said adhesive button has a T-shaped configuration.
Claim 47
Dependent Claim
15 words
A micaceous-cordierite-glass ceramic according to claim 39, wherein said adhesive button has a hook configuration.
Claim 48
Dependent Claim
22 words
Micaceous-cordierite-glass ceramic according to claim 39, further comprising relatively smaller, flat mica of 0.5 to 5 μm embedded in the glass ceramic.
Claim 49
Dependent Claim
174 words
An implant material for head surgery and neck surgery, comprising a biocompatible micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 MPa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic.
Claim 50
Dependent Claim
174 words
An implant material for head surgery and neck surgery, comprising a biocompatible micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 MPa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic.
Claim 51
Dependent Claim
27 words
An implant material according to claim 43, wherein said micaceous-cordierite-glass ceramic further comprises relatively smaller, flat mica of 0.5 to 5 μm embedded in the glass ceramic.
Claim 52
Dependent Claim
32 words
An implant material according to claim 43, wherein sasid micaceous-cordierite-glass ceramic further comprises up to 8 wt-% of a component selected from the group consisting of BaO, SrO, PbO, and mixtures thereof.
Claim 53
Dependent Claim
183 words
An implant material for head surgery and neck surgery, comprising a highly bioactive glass ceramic having machining properties, and a biocompatible micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 MPa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic.
Claim 54
Dependent Claim
183 words
An implant material for head surgery and neck surgery, comprising a highly bioactive glass ceramic having machining properties, and a biocompatible micaceous-cordierite-glass ceramic having a fracture toughness K IC of up to 2.0 MPa m 1/2 , a hardness HV 0 .07 of 300-1000, a compressive strength of up to 450 N/mm 2 , a linear thermal expansion coefficient of 75-125×10 -7 K -1 , good chemical stability and excellent machineability as well as a high resistance to abrasion comprising a composition of said micaceous-cordierite-glass ceramic consisting essentially in weight percentages of ______________________________________
SiO.sub.2
43-50
Al.sub.2 O.sub.3
26-30
MgO 11-15
R.sub.2 O
7-10.5
F.sup.-
3.3-4.8
Cl.sup.-
0.01-0.6
CaO 0.1-3
P.sub.2 O.sub.5
0.1-5
______________________________________ wherein R 2 O is the sum of 3 to 5.5 wt-% Na 2 O and 4 to 6 wt-% K 2 O, a first crystal phase of mica, and a second crystal phase of 5 to 30 volume-% cordierite, wherein relatively large mica crystals of 10 to 200 μm are embedded in the glass ceramic and cordierite crystals of 0.5 to 5 μm are arranged in the glass ceramic.
Claim 55
Dependent Claim
34 words
An implant material according to claim 46, wherein said bioactive glass ceramic and said biocompatible micaceous-cordierite-glass ceramic each have adjusted linear expansion coefficients whereby said implant material can be produced in a softening phase.
Claim 56
Dependent Claim
40 words
An implant material according to claim 46, further comprising at least one pigment oxide between said bioactive and said biocompatible glass ceramics for forming a visible, colored phase limit layer therebetween when said implant material is subjected to thermal treatment.
References Cited (Backward Citations)
US4120730A
Cited
US4431420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
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