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Phase Formation, Microstructure and Setting Time of Mcm-48 Mesoporous Silica Nanocomposites With Hydroxyapatite for Dental Applications: Effect of the Ca/P Ratio Publisher



Lenji RK1 ; Nourbakhsh AA1 ; Nourbakhsh N2 ; Nourbakhsh M3 ; Mackenzie KJD4
Authors

Source: Ceramics International Published:2017


Abstract

Nanocomposites of MCM-48 mesoporous silica and hydroxyapatite (HA) are investigated as possible alternatives for the commonly used Mineral Trioxide Aggregate (MTA) dental cement, and the effect of their Ca/P ratio on their structure, properties and setting times is reported. XRD, FTIR and EDS/SEM analysis of the nanocomposites indicate that crystalline HA is formed within the mesoporous silica structure. High Ca/P ratios lead to the formation of free CaO within the nanocomposite, decreasing its setting time; the shortest setting time (~ 40 min), which occurs in the MCM-48/HA nanocomposite with a Ca/P ratio of 5, in physiological saline solution, is considerably shorter than the setting time of MTA (~ 140 min under identical conditions). Thus, the shorter setting time of the MCM-48/HA nanocomposites, coupled with their lack of toxicity, high degree of bioactivity and their stability in tissue fluids, suggest that they could serve as a useful replacement for MTA. © 2017 Elsevier Ltd and Techna Group S.r.l.
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