Abstract
The purpose of this study was to test the influence of cavity liners, under class V silver amalgam restorations, on the penetration of radioactive tracers through the filling margins and the underlying dentine. Two hundred and thirty-four newly extracted human teeth were used in this study. Eight different liners and bases were tested in four different isotope solutions. It was found that the films formed by a copal resin varnish and a polystyreneethylcellulose liner prevented dentine penetration of the isotopes via the filling margins and also decreased marginal penetration significantly. The calcium hydroxide liners completely blocked dentine penetration by the isotopes but tended to concentrate the radioactive solutions in the liner substance. Marginal penetration was slightly increased. Zinc oxide-eugenol bases decreased dentine penetration somewhat but did not decrease the degree of marginal penetration. Zinc phosphate cement increased dentine penetration markedly as well as penetration of negative ions into the amalgam substance. Marginal penetration also may have been slightly increased. Under the conditions of this experiment, copal resin varnish, polystyrene-ethylcellulose liner, and calcium hydroxide liners were effective in preventing penetration of radioactive ions into the dentine and pulp; zinc oxide-eugenol and zinc phosphate cement bases were not.
Published Version
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