Effect of bioactive ceramic composition and structure onin vitro behavior. III. Porous versus dense ceramics

✍ Scribed by Radin, S. R. ;Ducheyne, P.

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 560 KB
• Volume: 28
• Category: Article
• ISSN: 0021-9304
• DOI: 10.1002/jbm.820281108

✦ Synopsis

In vitro reaction kinetics of surface transformations of porous and dense bioactive ceramics were studied after immersion in simulated physiologic solution (SPS). Porous ceramics with identical macroporosity were commercially obtained: calcium carbonate marine coral (I-CC), coralline HA (I-HA), and a product, labeled as p-tricalcium phosphate, which was partially transformed into p-calcium pyrophosphate (I-p-CP). Previously studied dense ceramics were used for comparison: Ca-deficient HA (CDHA), stoi-chiometric HA, both well and not well crystallized (wc and nwc s-HA), p-and a-tricalcium phosphate (pand a-TCP).

The induction time to precipitation increased as follows:

CDHA, nwc HA < wc HA, I-HA < P-TCP, I-CC << 1-p-CP. The reaction kinetics of ceramics with identical macroporosity varied substantially depending on composition, crystal structure, and ultrastructure. One of the porous ceramics, I-p-CP, showed an inhibiting effect on precipitation reactions.