Amount of hydroxyl radical on calcium-ion-implanted titanium and point of zero charge of constituent oxide of the surface-modified layer

T Hanawa; M Kon; H Doi; H Ukai; K Murakami; H Hamanaka; K Asaoka

doi:10.1023/a:1008847014938

Amount of hydroxyl radical on calcium-ion-implanted titanium and point of zero charge of constituent oxide of the surface-modified layer

J Mater Sci Mater Med. 1998 Feb;9(2):89-92. doi: 10.1023/a:1008847014938.

Authors

T Hanawa¹, M Kon, H Doi, H Ukai, K Murakami, H Hamanaka, K Asaoka

Affiliation

¹ Department of Dental Engineering, Tokushima University School of Dentistry, 3-18-15 Kuramoto-cho, Tokushima, 770 Japan.

PMID: 15348913
DOI: 10.1023/a:1008847014938

Abstract

To compare the surface properties of calcium-ion (Ca2+)-implanted titanium with those of titanium and to investigate the mechanism of bone conductivity of Ca2+-implanted titanium, amounts of hydroxyl radical of Ca2+-implanted titanium and titanium were estimated. Also, the point of zero charge (p.z.c.) of oxide constituting surface oxides of Ca2+-implanted titanium and titanium was determined. Results showed that the amount of active hydroxyl radical on Ca2+-implanted titanium was found to be significantly larger than that on titanium, indicating that the number of electric-charging sites of Ca2+-implanted titanium in electrolyte is more than that of titanium. The p.z.c. values of rutile (TiO2), anatase (TiO2), and perovskite (CaTiO3), were estimated to be 4.6, 5.9, and 8.1, respectively. Thus, Ca2+-implanted titanium surface is charged more positively in bioliquid than titanium, accelerating the adsorption of phosphate ions.