Nucleation and growth of octacalcium phosphate on treated  titanium by immersion in a simplified simulated body fluid.
A simplified simulated body fluid solution (S-SBF) was used to study the kinetics and mechanism of nucleation and growth of octacalcium phosphate (OCP) on the surfaces of alkali and heat-treated titanium samples. After the alkali and heat treatments, the samples were soaked in S-SBF for periods varying up to 24 h. A thin layer of poorly crystallized calcium titanate was formed after 15 min of immersion, allowing for the deposition of another layer of amorphous calcium phosphate (ACP). After 2.5 h of immersion, OCP nuclei were observed on the surface of the ACP layer. After 5 h of immersion in S-SBF solution, the specimens were completely covered with a homogeneous plate-like layer of OCP. Analyses by transmission electron microscopy revealed that nucleation and growth of OCP occurred concomitantly to the crystallization of ACP in hydroxyapatite (HA). This transformation took place by solid-state diffusion, forming a needle-like HA structure underneath the OCP film.
Gemelli
Enori
E
Department of Mechanical Engineering, Center of Technological Science, State University of Santa Catarina, Campus Universitario, Bairro Bom Retiro, 631, Joinville 89223-100, SC, Brazil. gemelli@joinville.udesc.br
Resende
Cristiane Xavier
CX
de Almeida Soares
Gloria Dulce
GD
D001826:Body Fluids / Q000737:chemistry*; D002130:Calcium Phosphates / Q000737:chemistry*; D003460:Crystallization; D017886:Durapatite / Q000032:analysis / Q000737:chemistry; D007101:Immersion; D008855:Microscopy, Electron, Scanning; D012996:Solutions; D014025:Titanium / Q000032:analysis / Q000737:chemistry*
D002130:Calcium Phosphates; D012996:Solutions; C519480:amorphous calcium phosphate; C022045:octacalcium phosphate; D017886:Durapatite; D014025:Titanium
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