Mutans Streptococci in Plaque from Margins of Amalgam, Composite, and Glass-ionomer Restorations

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Abstract
Levels of mutans streptococci in plaque samples from margins of Class II amalgam (Dispersalloy), composite (P-10), and glass-ionomer (Ketac Silver) restorations were compared. Fifty-one children, each having one of the restorations in a permanent first molar, were part of an inter-individual comparison, giving 17 restorations of each material. The age of the children, the age of the restorations, and the salivary levels of mutans streptococci were comparable in the three groups. Another seven children-each having both a composite and a glass-ionomer restoration of the same age placed on contralateral premolar or molar teeth-were part of an intra-individual comparison.