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Buffering or non-buffering; an action of pit-and-fissure sealants
Shinichi Kakuda1, Sharanbir K Sidhu2, Hidehiko Sano1
1Department of Restorative Dentistry, Division of Oral Health Science, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan.
Objectives:
The aim of this study was to evaluate the buffering capacity of glass-ionomer material in vitro. The null hypothesis tested was that there is no effect of cured glass-ionomer pit-and-fissure sealant (PFS) pastes on the environmental acidity as well as the tooth substrate.
Method:
For each material, a cured PFS disk and a section of human enamel were simultaneously soaked in lactic acid solution in a conical tube, and the pH of the solution was measured daily for one week. Subsequently, the total amount of calcium leached out in solution was also measured with ICP-AES.
Results:
The results showed that the acidity of the solutions changed over time. Significant differences of calcium ion concentration in solution were observed as a result of decalcification. As the PFS products tested did not include calcium, the concentration of calcium ion released indicated acidic erosion of the tooth enamel.
Conclusions:
The glass-ionomer countered the acid of the solution rapidly and preserved the structure of human tooth enamel.
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