Search for content and authors
 

Hard Tissue Compatibility of Titanium Phosphide Layers Obtained by Diffusion in Ti-HA Interface

Cheol Sang Kim 1,3Ki Eun Hwang 2Sung Joo Heo 4

1. Chonbuk National University, Devision of Electronics and Information Engineering, 31,Baekje-Ro, Duckjin-Gu, Jeonju 561-756, Korea, South
2. Chonbuk National University, Department of Mechatronics, Graduate School, 664-14, Duckgin-dong, Duckgin-gu, Jeonju 561-756, Korea, South
3. Chonbuk National University, Department of Biomedical Engineering, Graduate School, 664-14, Duckgin-dong, Duckgin-gu, Jeonju 561-756, Korea, South
4. Seoul National University, College of Detistry, Department of Prosthodontics, 28, Yungun Dong, Chongro-Gu, Seoul, Korea, South

Abstract

Previous studies on phosphide and oxide films formed by heat treatment of HA dip coated-Ti showed various properties with regard to both composition and morphology in the interfaces according to heating temperature. HA dip coated Ti screws were heated for 1 hour in a graphite furnace with protective argon atmosphere at 800(TiP1), 850(TiP2) and 900oC(TiP3) after producing a vacuum (102 Torr). The adhered HA coating layers on the metal surfaces were removed with strong jet spray of distilled water and subsequently sterilized according to standard procedures for metallic implant devices. Nine adult New Zealand white rabbits, aged 9 to 10 months, were used in the experiments. The three screw-shape specimens including non-treated Ti (c.pTi) screw were implanted in each animal, two in each medial proximal tibia according to the surgical protocol of the Branemark implant system. After 4 weeks, the rabbits were sacrificed with a lethal dose of pentobarbital injection and then the osseointegration was determined by an immediate measurement of the removal torque of the specimens. The result obtained demonstrated that the phosphide and rough Ti surface layers yielded higher the removal torque values than non-treated Ti surface. The mean values(standard deviation in parentheses) were 15.3(9.0), 33.8(17.9), 27.7(11.5) and 37.5(23.7) N-cm for c.pTi, TiP1, TipP2 and TiP3, respectively. Oxide thickness and mean pore size of the heated Ti surfaces increased relative to elevated heating temperature, the maximum phosphorus concentration(about 7 at.%.) diffused from the HA layer was obtained via heating at 800oC. From results of this experiment, a conclusion can be reached that the chemical composition of Ti phosphide layer with the surface morphology of Ti materials play an important role in bone bonding process on Ti implants.

 

Legal notice
  • Legal notice:
 

Related papers

Presentation: poster at E-MRS Fall Meeting 2003, Symposium E, by Cheol Sang Kim
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-26 15:30
Revised:   2009-06-08 12:55