Relationship between bioceramics sintering and micro-particles-induced cellular damages

Area of Science:

• Biomaterials Science
• Materials Science
• Cell Biology

Background:

• Cellular damage near implanted biphasic calcium phosphate (BCP) ceramics is a concern.
• The hypothesis suggests micro-particle release from insufficient sintering causes this damage.

Purpose of the Study:

• To investigate the link between BCP micro-particle release and cellular damage.
• To evaluate the cytotoxicity and in vivo behavior of BCP and its components.

Main Methods:

• In vitro cytotoxicity assays on BCP samples and micro-particles.
• In vivo implantation of hydroxyapatite (HA), beta-tricalcium phosphate (beta-TCP), and BCP granules in rabbit femurs.
• Analysis of particle release, degradation, and new bone formation.

Main Results:

• Cytotoxicity observed in BCP extraction media, eliminated after centrifugation.
• Micro-particles of HA, beta-TCP, and BCP inhibited cell viability in a dose-dependent manner.
• In vivo, BCP showed less degradation but lower new bone formation compared to HA and beta-TCP, with increased micro-particle formation.

Conclusions:

• Incompletely sintered HA micro-particles are released from BCP ceramics, potentially causing inflammation and affecting osteogenesis.
• Sintering difficulties at 1160°C for BCP ceramics lead to micro-particle release.
• Careful consideration of sintering processes is crucial for BCP bioceramics to mitigate adverse biological effects.