The crystal structures and hydraulic activities of β and γform dicalcium silicates (β-C2S, γ-C2S) were analyzed by ab-initio calculation based on quantum mechanics. The mean distances less than 4 Å to the neighboring Ca atoms for all of independent Ca atoms were calculated within unit cell. Ca-Ca mean distances are 3.56 Å in β-C2S and 3.75 Å in γ-C2S. The shortening of Ca-Ca distance causes ins...

Chapter 1. Magnesium-dependent phosphate ester processing enzymes frequently employ a carboxylate-bridged dimetallic unit in their active sites. Biomimetic modelling chemistry of these magnesium centers has not been investigated previously. An brief introduction of the enzyme systems is presented, along with the focus of the present work. Chapter 2. Several dimagnesium(II) complexes were synthe...

The present study evaluated the effectiveness of a dicalcium and tetracalcium phosphate-based desensitizer in reducing dentin permeability in vitro. Dentin fluid flow was measured before and after treatment of dentin with patent dentinal tubules using 1 or 3 applications of the dicalcium and tetracalcium phosphate containing agent TeethmateTM (TM) and comparing the results with two sodium fluor...

We present a systematic study of the transformation brushite (dicalcium phosphate dihydrate, CaHPO4•2H2O) under irradiation electrons well-defined energy (2.5 MeV) and flux as function dose. Contrarily to model hydroxides such portlandite brucite, which are very resistant electron radiation damage, studied decomposes quite easily, even for low doses. Irradiated samples were characterized using ...

Conclusions: Crystals forming mineral blocks of mostly compact matter are nucleated on organic substrates, with their growth controlled by the diffusion of building units through the virtually stagnant layer of interstitial fluid wetting the deposit surface. Preferentially formed precursors of hydroxyapatite, dicalcium, octacalcium and/or amorphous calcium phosphate, are in later stages of depo...