Hydration reactions and physicochemical properties in a novel tricalcium-dicalcium silicate-based cement containing hydroxyapatite nanoparticles and calcite: A comparative study

作者：Abnoba Moreno Vargas Yoshamin; Pedro Luna Arias Juan; Ocotlan Flores Flores Jose; Orozco Eligio; Bucio Lauro^*

来源：Ceramics International, 2017, 43(16): 13290-13298.

DOI：10.1016/j.ceramint.2017.07.027

• Spectroscopy
• Mechanical properties
• Calcium silicates cement
• Biomedical applications

The mineral trioxide aggregate (MTA) is Portland type cement whose main application in dentistry is retrograde filling. The purpose of this study was to analyze hydration reactions and physicochemical properties of a new tricalcium-dicalcium silicate-based cement containing nanocrystalline hydroxyapatite (nHAp) and calcite. The new formulation was compared with Biodentine (TM) and MTA-Angelus (TM) as control samples.
Hydration reactions were monitored by Raman spectroscopy, X-ray diffraction, radiopacity, pH, setting time, and compressive strength. The compressive strength reaches its higher value at 7 days following the sequence: Biodentine (TM) (104.8 MPa) > Cement + 5% nHAp (59 MPa) > MTAAngelus (TM) (27.3 MPa), in agreement with the pH values measured at 24 h: Biodentine (TM), Cements + nHAp or + calcite (10.6-11.6) > MTA-Angelus (TM) (9.7). Mean setting times was around 30 min and no significative differences (p = 0.0001) were observed. In the Biodentine (TM) control samples, Ca3SiO5 diminishes until disappear at 28 days of hydration. On their turn, calcium silicate hydrate (CSH) increases continuously in the range of time analyzed. The present results suggest that the physicochemical properties were improved for the new cement with nanosized hydroxyapatite nanoparticles and relevant information on chemical properties is of valuable importance for testing predictive models for Biodentine (TM) and MTA-Angelus (TM).

• 出版日期2017-11