Characterization of Calcium Phosphate Films Prepared by RF Magnetron Sputtering
- PDF / 278,555 Bytes
- 6 Pages / 612 x 792 pts (letter) Page_size
- 34 Downloads / 262 Views
0888-V05-01.1
Characterization of Calcium Phosphate Films Prepared by RF Magnetron Sputtering Takayuki Narushima, Kyosuke Ueda1, Takashi Goto2, Tomoyuki Katsube, Hiroshi Kawamura3, Chiaki Ouchi1 and Yasutaka Iguchi1 Tohoku University Biomedical Engineering Research Organization (TUBERO), Sendai 980-8579, Japan. 1 Department of Materials Processing, Tohoku University, Sendai 980-8579, Japan. 2 Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan. 3 Graduate School of Dentistry, Tohoku University, Sendai 980-8575, Japan. ABSTRACT Calcium phosphate films were prepared on commercially pure titanium (CP-Ti) substrates by RF magnetron sputtering using β-tricalcium phosphate targets. XRD and FTIR analyses showed that the films consisted of amorphous calcium phosphate and oxyapatite phases. The (002) preferred orientation of the oxyapatite phase was observed depending on the oxygen gas concentration in the sputtering gas. The surface reactions of the calcium phosphate films were investigated in Hanks’ solution and PBS(-). Apatite crystallites were detected on the films after immersion for 7 days. An active surface reaction was observed on the amorphous calcium phosphate films during immersion in PBS(-). The CP-Ti plates coated with the calcium phosphate films were placed on the mandible of male Japanese white rabbits. These results suggest that the calcium phosphate coating improves the biocompatibility of titanium implants with bone. INTRODUCTION Calcium phosphate has been coated onto metallic biomaterials to improve their biocompatibility. Many calcium phosphate coating processes have been investigated, including plasma spraying, sputtering, pulsed laser deposition, dip coating, sol-gel, and electrophoretic deposition [1]. Of these processes, sputtering has advantages such as low processing temperature and excellent adhesion to metallic substrates. Titanium and its alloys are known as biocompatible metals because of their high corrosion resistance and appropriate combination of strength and ductility [2]. Recently, low-modulus β-type titanium alloys composed of nontoxic and nonallergenic elements have been developed for medical and dental applications [3,4]. The low sputtering temperature is an advantage for coating calcium phosphate onto β-type titanium alloys because the mechanical properties of the β-type alloys would be degraded by high coating temperatures. Radiofrequency (RF) magnetron sputtering has been widely used for coating thin films with excellent adherence to substrates, and is a suitable technique for obtaining uniform and dense calcium phosphate films on titanium materials [5,6]. In the present study, calcium phosphate films were prepared on titanium substrates by RF magnetron sputtering, and the film phases and preferential crystal orientation were investigated. Immersion tests in Hanks’ solution and PBS(-) and the animal experiments were carried out to evaluate the biocompatibility of the films.
0888-V05-01.2
EXPERIMENTAL PROCEDURE Calcium phosphate films were prepared on comme
Data Loading...
