Analysis of the Organic Content in Two Hybrid Calcium-Silicate Cements

To overcome the manipulation disadvantages in contemporary bioactive materials, their composition has been changed and hybrid calcium-silicate cements were created. TheraCal LC (BISCO) and BioCal-Cap (Harvard Dental International, Germany) are the subject of this study. These direct pulp capping materials contain Portland cement and organic phase. This study aims to make a quantitative and qualitative analysis of the organic content of these cements. The methods for the uncured samples were gas-chromatography and mass-spectrometry SCAN mode; thermogravimetry – for the light-cured samples, gas-chromatography and mass-spectrometry SCAN mode; thermogravimetry – for the light-cured samles, gas-chromatography and mass – spectrometry SIM mode - for solventa extraction from light-cured samples. The observation of the uncured TheraCal identifies polymerization initiators – camphoroquinone, parbenate but no free monomers. A reason for that might be the presence of prepolymers that cannot pass into the gas phase. BoiCal-Cap is a new (2019) and noninvestigated material. Our investigations of BioCal-Cap reveal the main organic component – HEMA. Other chemicals were also detected. There was no free HEMA in light-cured samples. The thermogravimetric analysis of the light-cured TheraCal shows 3 mass loss and no loss for BioCal-Cap. The results reveal that BioCal-Cap might have positive advantages for the success of direct pulp capping and more investigations should be performed to support this statement.