Prosthetic implant or component therefor of a magnesium oxide stabilized transformation toughened zirconia (Mg-TTZ) ceramic can be made by providing a bisqued initial green body by compressing powder through a cold isostatic press and heating to a bisque stage. Then, without embedding it in an embed
Prosthetic implant or component therefor of a magnesium oxide stabilized transformation toughened zirconia (Mg-TTZ) ceramic can be made by providing a bisqued initial green body by compressing powder through a cold isostatic press and heating to a bisque stage. Then, without embedding it in an embedding mass, the bisque is machined to have a shape of the same proportions as the shape of, but larger than, the ceramic portion of a fired prosthetic implant or component product. Firing can provide the fired Mg-TTZ ceramic body product.
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1. A method for making a ceramic body prosthetic implant or prosthetic implant component of Mg-TTZ ceramic, which method comprises providing a bisqued initial green body of ceramic by providing a powdered ceramic material, which substantially is a monoclinic zirconia having magnesium oxide for a sta
1. A method for making a ceramic body prosthetic implant or prosthetic implant component of Mg-TTZ ceramic, which method comprises providing a bisqued initial green body of ceramic by providing a powdered ceramic material, which substantially is a monoclinic zirconia having magnesium oxide for a stabilizer, and, without employing a binder additional to the powdered ceramic to do so: compressing the material in its powder form through a cold isostatic press operation to form a raw, pressed initial green body, and then heating the raw, pressed initial green body to a bisque stage to provide the bisqued initial green body; and, after the foregoing steps are carried out without the employing a binder additional to the powdered ceramic material, carrying out the following further steps:without embedding the bisqued initial green body of ceramic in an embedding mass, machining the bisqued initial green body to provide a machined, bisqued green ceramic body such that the machined, bisqued green ceramic body has a shape, which is a precursor shape essentially analogous to, being of the same proportions as, the shape of, but larger than, the ceramic portion of a fired predetermined finished ceramic body prosthetic implant or prosthetic implant component; and then firing the machined, bisqued green ceramic body to provide a fired Mg-TTZ ceramic body product, which is the same size and shape or essentially the same size and shape as the ceramic portion of the fired predetermined finished ceramic body prosthetic implant or prosthetic implant component; wherein a hot isostatic press operation is not carried out. 2. The method of claim 1, wherein the machined and fired ceramic body product has a density of at least about 99 percent of theoretical. 3. The method of claim 2, wherein the magnesium oxide is present at about from 3 to 3½ percent by weight. 4. The method of claim 2, wherein the heating to the bisque stage is carried out at about from 100 to 1100 degrees C.; the firing is carried out at about from 1600 to 1900 degrees C. in temperature, with ramping leading to the firing carried out at about from ½ to 20 degrees C. per minute; and anealing is carried out by gradually cooling hot, fired Mg-TTZ ceramic body, which leads to the fired Mg-TTZ ceramic body product, from the firing temperature, keeping it in a heated condition, by gradually reducing the temperature of hot, fired Mg-TTZ ceramic body below the firing temperature and keeping it there a suitable time, followed by further gradual cooling. 5. The method of claim 1, wherein the bisqued green body of ceramic is contacted by and infiltrated with an adjuvant, removed from any gross external adjuvant by which the bisqued green body of ceramic was contacted for the infiltration; and the removed, infiltrated, bisqued green body of ceramic is machined. 6. The method of claim 1, wherein the powdered ceramic material has at most an about 10-um cross-section. 7. The method of claim 1, wherein polishing is the sole mechanical finishing operation to the fired ceramic body product. 8. The method of claim 1, wherein the machined and fired ceramic body product is for or of a load-bearing intricate prosthetic implant or prosthetic implant component. 9. The method of claim 8, wherein the machined and fired ceramic body product is for or of a femoral frame component for a rotating knee joint implant. 10. The method of claim 8, wherein the machined and fired ceramic body product is for or of a femoral component for a posterior stabilized knee joint implant. 11. The method of claim 8, wherein the machined and fired ceramic body product is for or of a femoral component for a cruciate-retaining knee joint implant, which includes medial and lateral condylar articular surfaces. 12. The method of claim 8, wherein the machined and fired ceramic body product is for or of a unicompartmental femoral condylar component for a knee joint. 13. The method of claim 8, wherein the machined and fired ceramic body product is for or of an implant selected from the group consisting of a one-piece unicompartmental knee spacer device; a multi-piece unicompartmental joint aligning device; a temporal mandibular joint cap implant; a patellofemoral joint implant; a vertebra cap; an ankle joint ensemble or component; a bridge, a tooth or teeth; a tibial tray for a knee joint replacement implant; and an intermediary articulation plate for a tibial tray and liner for a knee joint replacement implant, or said plate assembed in combination with said tray. 14. The method of claim 1, wherein the machined and fired ceramic body product has a strength corresponding to that which would be provided in a femoral condylar component made of corresponding Mg-TTZ ceramic, which has a strength against a posterior condyle of said femoral condylar component of at least about 1500 pounds (about 0.68 metric tons) when tested according to United States Food and Drug Administration standards corresponding to standards for strength testing on a posterior condyle of a metal femoral knee component in which force is applied in a posterior to anterior direction on an unsupported portion of the posterior condyle. 15. The method of claim 8, wherein the machined and fired ceramic body product has a strength corresponding to that which would be provided in a femoral condylar component made of corresponding Mg-TTZ ceramic, which has a strength against a posterior condyle of said femoral condylar component of at least about 1500 pounds (about 0.68 metric tons) when tested according to United States Food and Drug Administration standards corresponding to standards for strength testing on a posterior condyle of a metal femoral knee component in which force is applied in a posterior to anterior direction on an unsupported portion of the posterior condyle. 16. The method of claim 9, wherein the machined and fired ceramic body product has a strength against a posterior condyle of said femoral frame component of at least about 1500 pounds (about 0.68 metric tons) when tested according to United States Food and Drug Administration standards corresponding to standards for strength testing on a posterior condyle of a metal femoral knee component in which force is applied in a posterior to anterior direction on an unsupported portion of the posterior condyle. 17. The method of claim 10, wherein the machined and fired ceramic body product has a strength against a posterior condyle of said femoral component of at least about 1500 pounds (about 0.68 metric tons) when tested according to United States Food and Drug Administration standards corresponding to standards for strength testing on a posterior condyle of a metal femoral knee component in which force is applied in a posterior to anterior direction on an unsupported portion of the posterior condyle. 18. The method of claim 11, wherein the machined and fired ceramic body product has a strength against a posterior condyle of said femoral component of at least about 1500 pounds (about 0.68 metric tons) when tested according to United States Food and Drug Administration standards corresponding to standards for strength testing on a posterior condyle of a metal femoral knee component in which force is applied in a posterior to anterior direction on an unsupported portion of the posterior condyle. 19. The method of claim 12, wherein the machined and fired ceramic body product has a strength against a posterior condyle of said femoral component of at least about 1500 pounds (about 0.68 metric tons) when tested according to United States Food and Drug Administration standards corresponding to standards for strength testing on a posterior condyle of a metal femoral knee component in which force is applied in a posterior to anterior direction on an unsupported portion of the posterior condyle. 20. The method of claim 13, wherein the machined and fired ceramic body product has a strength corresponding to that which would be provided in a femoral condylar component made of corresponding Mg-TTZ ceramic, which has a strength against a posterior condyle of said femoral condylar component of at least about 1500 pounds (about 0.68 metric tons) when tested according to United States Food and Drug Administration standards corresponding to standards for strength testing on a posterior condyle of a metal femoral knee component in which force is applied in a posterior to anterior direction on an unsupported portion of the posterior condyle. 21. The method of claim 1, wherein the machined and fired ceramic body product is light-transmissive so as to provide for rapid setting of surgical cement by use of illumination passed therethrough.
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