Effects of subgingival restorations in beagle dogs. Part I: Plaque formation

In vitro plaque formation on dental amalgam

“…Sybraloy supported nearly twice as much plaque as Dispersailoy and significantly a very high proportion of the bacteria were viable. This follows the pattern reported elsewhere (Smales, Nixon & Joyce, 1979;Smales, 1981) and confirms the view that the presence of a high copper content in the newer alloys does not necessarily result in bacterial inhibition (Heys etal., 1979). It must be recognized, however, that in this study the amalgatn samples were stored in aqueous solutions for some time prior to their use, a factor which could have reduced the amount of leacheable copper (Espevik, 1977).…”

“…This has been attributed to a variety of factors but mostly to the probability that potentially toxic metallic ions are released into the immediate environment (Hyypa & Paunio, 1977). Amalgams have also been shown to display relatively smooth surfaces (Smales, 1981).…”

“…In addition other factors which influence bacterial retention include the roughness of the surface (Mormon, Regolati & Renggli, 1974;Gildenhuys & Stallard,1975)andthetypeoffillingmaterial (Skiorland, 1973;Smales, 1981). In the present experiment a previously described method for the study of //; vitro plaque formation on dental materials (Dummer & Harrison, 1982) was utilized in order to study bacterial adsorption and growth on five commercially available dental amalgams, ]VIaterials and methods…”