Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1978-06-27
1981-01-13
Peshock, Robert
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433176, 433201, A61C 800
Patent
active
042446899
ABSTRACT:
Nontoxic polymeric plastic medical implants for endosteal and periosteal applications such as filling bone defects, replacing entire bony parts, and tooth replacement either immediately after extraction or subsequent to healing, and a method of fabricating such implants to produce a porous surface having a predetermined pore size, pore depth, and degree of porosity. The method of fabrication of the porous portion of the implant involves adding sodium chloride crystals or other nontoxic leachable substance of controlled particle size corresponding to the desired pore size to a powdered polymer-liquid monomer mixture in relative amounts corresponding to the desired degree of porosity. After heat polymerization without an initiator, followed by abrasive removal of the resulting surface skin, the salt is leached from the plastic to provide said porosity. To obtain bone ingrowth in the case of intraosseous implantation, the pore size must be 200-400 microns, whereas pore size for soft tissue ingrowth should be 50-150 microns.
REFERENCES:
patent: 3609867 (1971-10-01), Hodosh
patent: 3628248 (1971-12-01), Kroder
patent: 3808606 (1974-05-01), Tronzo
patent: 3936887 (1976-02-01), Hodosh
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