Abstract

Ultrasonic measurements were used to characterize the setting process of glass-ionomer dental cement (GIC) and to evaluate the effect of temperature on the setting time and mechanical properties. The ultrasonic method has the potential to be an ideal new tool for direct, real-time evaluation of the GIC setting reaction, providing detailed information on the evolution of their parameters as a function of setting time. The cement paste was prepared following the manufacturer’s instructions, from polycarboxylic acid and fluoroaluminosilicate glass, then inserted into cylindrical molds (8.0 mm in diameter and 3.0 mm in thickness). The cement mixing and the measurements of the acoustic properties were carried out at three different temperatures. The setting behavior was analyzed by monitoring changes in the ultrasonic velocity of the longitudinal wave. The results obtained show that the increase in temperature considerably accelerated the setting reaction. It was concluded that the proposed method is very effective in evaluating the setting reaction when an external energy source is applied and that the addition of heat energy to the setting almost sets GIC on command and improves their early mechanical properties.

中文翻译：

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超声检查玻璃离聚物水泥固化机理

摘要

超声波测量用于表征玻璃离聚物牙科水泥（GIC）的固化过程，并评估温度对固化时间和机械性能的影响。超声方法有可能成为直接，实时评估GIC凝固反应的理想新工具，并提供有关其参数随凝固时间变化的详细信息。按照制造商的说明，由聚羧酸和氟铝硅酸盐玻璃制备水泥浆，然后将其插入圆柱形模具（直径8.0 mm，厚度3.0 mm）中。在三种不同温度下进行水泥混合和声学性能的测量。通过监测纵波超声速度的变化来分析凝固行为。所获得的结果表明，温度的升高大大加速了固化反应。结论是，所提出的方法在评估使用外部能源时的凝结反应非常有效，并且向凝结处添加热能几乎可以使GIC发挥作用，并改善了其早期的机械性能。