title: [The change of physical properties of plastics (polyoxymethylenecopolymer, polyethyleneterephthalate, polyethylene, polytetrafluorethylene) after animal implantation and autoclavation (author's transl)].
abstract: The change of physical properties of plastics (polyoxymethylene-copolymer, polyethyleneterephthalate, polyethylene, polytetrafluorethylene) and the bio-compatibility of these materials were examined by implantation in the backmuscle of 6-month-old male rabbits for 4 and 12 weeks and after autoclavation. We have found out, that after implantation and autoclavation polyethylene-terephthalate demonstrates a strong diminution of the visco-elastic qualities. Polyethylene and polytetrafluorethylene were not changed by these treatments. After an implantation of 12 weeks and an autoclavation of four times the visco-elastic properties of polyoxymethylene-copolymer were only slightly diminished by 10 to 15%. The histological investigation of the surrounding tissue demonstrated a very good bio-compatibility of polyethylene. After an implantation of 4 weeks polyoxymethylene-copolymer, polyethyleneterephthalate and polytetrafluorethylene produced a comparable foreign body reaction, which, however, was evidently diminished after an implantation of 12 weeks.
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004548:Elasticity; D005547:Foreign Bodies; D008297:Male; D009132:Muscles; D011093:Polyethylene Terephthalates; D011095:Polyethylenes; D011108:Polymers; D011138:Polytetrafluoroethylene; D011817:Rabbits; D013997:Time Factors; D014783:Viscosity
chemical_list: D001672:Biocompatible Materials; D011093:Polyethylene Terephthalates; D011095:Polyethylenes; D011108:Polymers; D011138:Polytetrafluoroethylene
vernacular_title: Die Veränderungen der physikalischen Eigenschaften von Polyacetalharz (Hostaform C), Polyester (Hostadur), Polyäthylen (Hostalen) und Teflon (Hostaflon) nach tierischer Implantation und mehrfachem Autoklavieren