各種填塞・修復材のpHおよびフッ素徐放性の経時的変化

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  • Serial Changes in pH and Sustained; Fluoride Release in Various Types of Condensation and Filling Materials

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With regard to the serial changes in pH and the amount of sustained fluoride release in various types of condensation and filling materials with sustained fluoride release, the following results were obtained under various conditions.<BR>1. Continuous sustained fluoride release was noted in the specimens immersed in 50 ml physiological saline, and marked decreases in pH were detected in some condensation materials.<BR>2. Specimens immersed in 1,000 ppm ion concentration fluoride solution 5 days after irradiation showed Larger amounts of sustained fluoride release, in comparison with the specimens immersed in physiological saline.<BR>3. Specimens, to which daily temperature changes between 4°C and 60°C were applied immediately after irradiation, showed lower pH values and increases in the amount of sustained fluoride release in comparison with the specimens immersed in 50 ml physiological saline.<BR>4. Specimens immersed in 50 ml physiological saline, to which sand blast treatment was performed 5 days after irradiation, showed marked increases in the amount of sustained fluoride release.<BR>These findings suggested that materials with sustained fluoride release continuously release fluorides, repeatedly recharging and releasing, according to temperature loading, and changes in the surface structure. It was speculated that the oral cavity with changes in temperature and pH is influenced in a similar way receives. It was therefore considered that topical application of fluorides to the smooth surface of the tooth crown after condensation and filling increases the amount of sustained fluoride release in the condensation and filling materials, and caries preventive effects on the immature permanent teeth are expected.

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