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KMID : 0378019730160040119
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New Medical Journal
1973 Volume.16 No. 4 p.119 ~ p.125
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The Effect of Zinc Phosphate Cement on The Solubility of Powdered Enamel and Dentin.
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Abstract
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This present series of experiments were undertaken to study the effect of zinc phosphate cement on the acid solubility of human tooth which had engaged the attention of many investigators.
Powdered enamel and dentin, 120-200 mesh sieve size, prepared from healthy human permanent tooth, were treated with setting zinc phosphate cement in various ways in vitro, 1) a constant amount of setting zinc phosphate cement and pure zinc phosphate were treated with the powdered enamel and dentin over the pH range of 2.4-6.1 of O.1M citrate buffer for 1 hour, 2) 50mgs of powdered enamel and dentin were treated with 1, 5,15, 30, and 50mgs. of setting zinc phosphate cement and pure zinc phoshate in 0. 1 M citrate buffer, pH 4.5 for 1 hour, and 3) powdered enamel and dentin, which were pre-treated with 2% NaF and/or aqueous filtrate of setting zinc phosphate cement, were dissolved in O.lM acetate buffer, pH 3.0 for 1 hour. The control experiment was performed simultaneously with the above series of experiments. After the treatment the mixtures were centrifuged and the calcium amount of supernatant, dissolved from powdered enamel and dentin, was determined titrimetrically. The amount of dissolved calcium was taken as a parameter of acid solubility of powdered enamel and dentin, evaluated the results, and discussed the proposed mechanism of this effect.
The obtained result was summarized in the following:
1) The acid solubilities of either powdered enamel or dentin are reduced by treating these with setting zinc phosphate cement or pure zinc phosphate over the pH range of 2.4-6. 1 of 0. IM citrate buffer, showing marked reduction over pH3.5-4.5 in powdered enamel.
2) The more the amount of setting zinc phosphate cement and pure zinc phasphate, the more effective it is in reducing the acid solubility of powdered enamel and dentin.
3) The reducing effect in acid solubility is greater in pre-treating with sodium fluoride and setting zinc phosphate cement than in pre-treating with only setting zinc phosphate cement.
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