Journal of Oral Tissue Engineering

Thin Carbonate-containing Apatite Coating of a Titanium Web using a Molecular Precursor Method under Oxygen Gas Introduction

Tohru HAYAKAWA1, Akihiro AMETANI2, Yoshinori KUBOKI3 and Mitsunobu SATO4

1Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo, Chiba, Japan
2Medical Device Department, HI-LEX Corporation, Inc. Hyougo, Japan
3Professor Emeritus, Hokkaido University, Sapporo, Japan
4Coordination Engineering Laboratory, Faculty of Engineering, Kogakuin University, Tokyo, Japan

J Oral Tissue Engin 2008;6(3): 201-210

Full Text. DOI

Thin carbonate-containing apatite (CA) coatings were deposited onto titanium webs (TW) using a molecular precursor method. The volumetric porosity and fiber diameter of the TW were 87 % and 50 mm, respectively. A molecular precursor solution was obtained by adding dibutylammonium diphosphate salt to Ca-EDTA/ amine ethanol solution by adjusting the Ca/P ratio to 1.67. Two molecular precursor solutions with different calcium ion concentrations, 0.157 mmol/g (0.157-precursor) and 0.470 mmol/g (0.470-precursor), were prepared. Each sintered TW was immersed in the molecular precursor solution and then heated at 600 oC for 2 hr under oxygen gas introduction. Without oxygen gas, the CA coated TW appeared darker and blacker. Oxygen gas introduction produced a whiter TW appearance after CA coating.
Three-times coating of 0.157-precursor produced a CA coating that covered the surface of the TW as well as its center. By using the 0.470-presursor, a single application of CA covered the inside as well as the surface of the TW.
Increasing the calcium ion concentration of the molecular precursor solution enabled onetime application for effective CA coating not only of the surface of the TW but also its center. In conclusion, one-time application of 0.470-precursor solution during oxygen gas introduction produces a sufficiently CA coated TW.

Key words: molecular precursor method, carbonate-containing apatite coating, titanium web