Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/41592

Title

Structural changes of plasma sprayed hydroxyapatite coatings during in-vitro testing

Author(s)

Gross, Karlis A.;  Berndt, Christopher C.

Abstract

The in-vitro behavior of hydroxyapatite (HAp) coatings depends on the thermal history of the coating after thermal spraying. As-sprayed amorphous coatings degrade in Ringer's solution. Heat treatment at 800°C for 2 hours produces a crystalline coating which upon immersion in physiological solution displays a greater stability. Coatings are characterized for surface morphology, composition, crystallinity, roughness, and weight loss. The as-sprayed coating shows changes in the coating morphology with immersion time. Individual lamellae crack and separate from the coating. Those lamellae still intact show evidence of dissolution. After a period of 8 weeks small HAp spheres cover the surface of the as-sprayed and heat treated coatings. These morphological changes are expected to influence the rate of bone bonding. Therefore post-treatment of HAp coatings is seen as a technique to alter or control implant tissue interactions.

Publication type

Conference paper

Source

Characterization and performance of calcium phosphate coatings for implants: Papers presented at a symposium sponsored by ASTM Committee F-4 on Medical and Surgical Materials and Devices, Miami, Florida, United States, 17 Nocember 1992 / Emanuel Horowitz and Jack E. Parr (eds.), pp. 124-139

Publication year

1994

Keyword(s)

Ceramic coatings;  Crystalline materials;  Degradation;  Hydroxylapatite;  Implant tissue interactions;  Invitro testing;  Lamellae cracks;  Microstructure;  Plasma spraying;  Ringer solution;  Surgical implants

Publisher

ASTM

ISBN

9780803118546, 0803118546

Peer reviewed