AIM To evaluate the clinical and radiological response of primary molars to direct pulp capping with calcium sulfate hemihydrate. MATERIALS AND METHODS Forty primary molar teeth in 40 healthy children aged 5-9 years were treated by direct pulp capping. Teeth were randomly assigned to two groups (n=20) according to material used for capping, as follows: Group 1: calcium hydroxide cement (Dycal...

This work investigates the early stages of precipitation of calcium sulfate from aqueous solution at room temperature and shows for the first time that amorphous calcium sulfate (ACS) and calcium sulfate hemihydrate are sequentially precipitated prior to calcium sulfate dihydrate (gypsum).

Introduction: Beta calcium sulfate hemihydrate (BCSH), which is commonly known as “Gypsum plaster” has long been used as bone graft material because of its excellent biocompatibility and the ability for bone regeneration. Several methods have been used for the preparation of BCSH, including heat treatment of calcium sulfate dihydrate with water, application of inorganic acids or condensed inorg...

Gypsum (calcium sulfate dihydrate) is one of the most used inorganic binding materials in world. During calcination, calcium subhydrates are formed and, for technical reasons, mixed with water to form dihydrate again. Therefore, dehydration process gypsum and rehydration hemihydrate were investigated. This technically performed three different ways. Heating up, i.e., a rotary kiln, leads prefer...

We report a facile and green chemical solution approach to synthesize monodisperse α-calcium sulfate hemihydrate (α-HH) nanoellipsoids with a length of 600 nm and a width of 300 nm by simply mixing Ca(2+) and SO4(2-) glycerol-water precursor solutions in the presence of Na2EDTA. The α-HH nanoellipsoid is formed through a Na2EDTA-mediated self-assembly of small primary building blocks (α-HH doma...

Calcium sulfate exists in three forms, namely dihydrate or gypsum (CaSO4·2H2O), anhydrite (CaSO4), and hemihydrate bassanite (CaSO4·0.5H2O) depending on temperature, pressure, pH, formation conditions. The of calcium sulfates occurs widely nature many engineering settings. Herein, a dataset containing the experimental solubility data minerals, i.e., anhydrite, aqueous solutions is presented. co...

The differences between the hydration of Portland cements with single and mixed sulfate carriers in presence triethanolamine (TEA) were investigated, possible mechanisms proposed. Without TEA, different types (gypsum, hemihydrate, anhydrite, mixture these) have a comparable process at same molar amount calcium sulfate. At TEA dosage 0.5 wt.%, sample three shows substantially stronger retardatio...