ALLOPLASTIC MATERIALS IN PLASTIC SURGERY
ALLOPLASTIC MATERIALS IN PLASTIC SURGERY
ALLOPLASTIC MATERIALS IN PLASTIC SURGERY
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Properties-<br />
Ceramics<br />
• Brittle – minimal deformation per unit force.<br />
• Strong compressive strength.<br />
• Weakened by flaws, microcracks and porosity.<br />
• Highly inert.<br />
• Used as bone substitutes, not in load bearing<br />
areas.<br />
Hydroxyapatite (HA)<br />
• Most common apatite crystal is calcium HA<br />
• Synthetic varieties:<br />
- sintering Ca and P particles<br />
- dense or porous<br />
• Natural varieties:<br />
- porous coralline HA (50-200m)<br />
• No inflammatory or foreign body giant cell response<br />
• Bone regeneration by osteoconduction (scaffold)<br />
• No osteoinduction
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