Bonding of bone to materials presenting a high specific area, porous, silica-rich surface
Patent 4171544 Issued on October 23, 1979. Estimated Expiration Date: 
April 5, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 5, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3054221 3147127 3804647 3908201 3919723 3922155 3923533 Surgical implant and method for its production Hip endoprosthesis with stepped load-transferring surfaces Method of preparing glazes InventorsAssigneeApplicationNo. 05/893792 filed on 04/05/1978US Classes:623/23.62, Cement106/676, Glass containing106/677, Organic material containing156/325, Particular adhesive156/89.11, With vitrification or firing ceramic material433/173, By fastening to jawbone433/180, By cement or adhesive501/2, Devitrified glass-ceramics501/39, Pore-forming501/54, More than 90 percent by weight silica501/63, And phosphorus, niobium, or tantalum606/76Specialized coating or materialExaminersPrimary: Vertiz, O. R.Assistant: Bell, Mark L. Attorney, Agent or FirmInternational ClassesA61C 8/00 (20060101)A61L 27/00 (20060101) A61L 27/10 (20060101) AbstractCompositions possessing a porous, high specific area, silica-rich surface, or capable of developing such a surface in vivo, form strong bonds with bone tissue. These compositions are thus excellent materials for dental and surgical implants, or the coatings thereof. Examples of such compositions include highly porous glasses and glass-ceramics comprising at least about 80 weight percent silicon dioxide, hardened inorganic cements such as Portland cement and known silicon dioxide-based biologically active glasses and glass-ceramics. Neither calcium, sodium nor phoshorus compounds are necessary ingredients. Cements which develop the above described surface characteristics in vivo form a strong bond with both bone and implant when used in the fixation of dental and surgical implants, especially those made or coated with a biologically active silicon dioxide-based glass or glass-ceramic.Other References
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