Effects of silica addition on the chemical, mechanical and biological properties of a new α-Tricalcium Phosphate/Tricalcium Silicate Cement

Abstract

The addition of tricalcium silicate (C 3 S) to apatite cements results in an increase of bioactivity and improvement in the mechanical properties. However, adding large amounts raises the local pH at early stages, which retards the precipitation of hydroxyapatite and produces a loss of mechanical strength. The introduction of Pozzolanic materials in cement pastes could be an effective way to reduces basicity and enhance their mechanical resistance; thus, the effect of adding silica on the chemical, mechanical and biological properties of a-tricalcium phosphate/C 3 S cement was studied. Adding silica produces a reduction in the early pH and a decrease in setting times; nevertheless, the presence of more calcium silicate hydrate (C-S-H) delays the growth of hydroxyapatite crystals and consequently, reduces early compressive strength. The new formulations show a good bioactivity, but higher cytotoxicity than traditional cements and additions higher than 2.5% of SiO 2 cause a lack of mechanical strength and an elevated degradability.

Selective Allylic Oxidation of Terpenic Olefins Using Co-Ag Supported on SiO2 as a Novel, Efficient, and Recyclable Catalyst

“…e amount of silver and cobalt codoped in SiO 2 do not change the morphology compared to its support. EDX results confirm that codoped and undoped SiO 2 nanopowders consist of elements of silicon, cobalt, and silver ( Figure 6) in good agreement with the literature [41,42] and providing further evidence for the successful synthesis of our nanocatalyst.…”

Physicochemical and Mechanical Properties of Premixed Calcium Silicate and Resin Sealers

“…Lowest compression modulus and strength were obtained when testing the specimens created using the AHPB sealer. In general, the lower the amount of calcium silicate in CS sealers, the greater the flexibility of sealer [ 35 , 36 ]. In addition, the most important phase in cement paste is the calcium silicate hydrate, which plays a role in the mechanical properties of the cements [ 35 ].…”

Micro-computed Tomography Analysis of the Effect of Immersion Time on Volumetric Stability of Different Endodontic Materials

“…Calcium silicate-based repair cements are widely used in endodontics for vital pulp therapy, internal/external resorption, perforation repair, and root-end filling 25 . The calcium silicate component lead to an increase of bioactivity and improvement in the mechanical properties of cements 26 . Biodentine and MTA are calcium silicate-based cements that present bioactive potential, influencing the repair of adjacent tissues 27 .…”