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1 Marquette University, Milwaukee, Wisconsin 53233, USA and Electros Analytics, Tigard, Oregon
When zinc phosphate cement is formed enclosed between a glass plate and a tooth surface, it retains the excess moisture available at the time of setting. This causes the cement surfaces to become covered with weakly held crystals of hopeite (3 ZnO · P2 O5 · 4 H2O). Crystals of hopeite also are evident at the surfaces of a zinc phosphate cement inserted into a tooth cavity.
Submitted on April 17, 1972
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