[Study on the expansion properties of homemade fast investment material for the IPS-Empress2 castable ceramic]

Gang He1, Yunmao Liao, Yuankun Cen

  • 1West China College of Stomatology, Sichuan University, Chengdu 610041, China.

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Soundness of Cement

The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create ettringite,...