Radiopaque acrylic resins containing miscible heavy-metal compounds.
Radiopacity is needed in order to facilitate diagnosis of polymeric appliances, which may be dislodged and become impacted in the upper respiratory or digestive tracts. In order for a stable, optically transparent, radiopaque material to be provided, heavy-metal compounds were investigated which we had previously shown to form homogeneous structures with methyl methacrylate-based systems. It was found that, when present in PMMA at 11 to 14%, several compounds of either bismuth or uranium or 35% of an organo-zirconium compound impart radiopacity equivalent to that of aluminum. A low level of cytotoxicity and lack of mutagenicity indicated that a high level of biocompatibility can be expected. Processing characteristics are somewhat altered, but formulations satisfactory for use in various dental devices were found.
Rawls
H R
HR
University of Texas Health Science Center, San Antonio.
Starr
J
J
Kasten
F H
FH
Murray
M
M
Smid
J
J
Cabasso
I
I
D000180:Acrylic Resins / Q000737:chemistry*; D001729:Bismuth / Q000737:chemistry; D003287:Contrast Media; D003764:Dental Materials / Q000737:chemistry*; D005547:Foreign Bodies / Q000000981:diagnostic imaging; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011859:Radiography; D014501:Uranium / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
D000180:Acrylic Resins; D003287:Contrast Media; D003764:Dental Materials; D008689:Methacrylates; D014501:Uranium; D015040:Zirconium; D001729:Bismuth