J. Lyell, D. Barber, M. Massler
May 1, 1964
Citations
0
Influential Citations
19
Citations
Journal
Journal of Dental Research
Abstract
A number of studies, using dyes and isotopes, have shown that freshly placed amalgam restorations do not completely seal the cavities in which they are placed.'-5 In spite of this shortcoming, the generally satisfactory nature of amalgam restorations has led to further investigations, which have shown that there is a considerable reduction in the marginal penetration of isotopes as the amalgam ages.f9 The cause of this decrease in marginal penetration has not yet been investigated fully, but it has been reasoned that "metallic ions and corrosive products" may fill in this area.3 I It has also been suggested that salivary constituents deposit in the patent margins of such restorations and thus block the margins against further penetration by ions or dyes.6 7 10 In this study ninety-three freshly extracted teeth were used to place simple Class V amalgam restorations. The teeth were then stored for varying periods of time in sodium sulfide solutions, saliva, tap water, distilled water, and moist air in order to observe the effect of this storage on the marginal penetration of isotopes and dye. One hundred unstored teeth were used as comparative controls. The dye used as a tracer was a 3.8 per cent aqueous solution of toluidine blue. The isotopes were S35 as sodium sulfate and Ca45 as calcium chloride. Dye and isotopes were used in combination.