Overview
Carbonated hydroxyapatite (CHA) is a calcium phosphate mineral structurally similar to hydroxyapatite but with carbonate ions substituting for phosphate or hydroxide groups in its crystal lattice. This substitution makes CHA chemically closer to biological apatite found in bones and teeth, enhancing its biocompatibility and resorption properties. First synthesized in the 1970s, CHA has become a material of significant interest in regenerative medicine due to its ability to integrate with living bone tissue. The carbonate content typically ranges between 4-8 wt%, which can be precisely controlled during synthesis to tailor its dissolution rate and bioactivity.
Physical and Chemical Properties
CHA maintains the hexagonal crystal system of hydroxyapatite but with expanded lattice parameters due to carbonate substitution. The incorporation of carbonate reduces crystallinity compared to pure hydroxyapatite, which contributes to its increased solubility and biodegradability - crucial properties for bone regeneration applications. The material exhibits excellent thermal stability up to approximately 800°C, beyond which it begins to decompose. Its surface chemistry promotes protein adsorption and cell adhesion, making it particularly suitable for biomedical applications. The carbonate content can be verified through infrared spectroscopy (showing characteristic peaks at 880 cm⁻¹ and 1450-1550 cm⁻¹) or chemical analysis.
Main Applications
In orthopedics, CHA serves as a scaffold material for bone defect filling and as a coating for metal implants to enhance osseointegration. Its composition and porosity can be engineered to match the requirements of specific applications, from load-bearing implants to porous scaffolds for cancellous bone replacement. The dental industry utilizes CHA in toothpaste formulations (as a remineralizing agent), endodontic sealers, and periodontal defect fillers. Recent advances have explored its use in drug delivery systems, where the gradual dissolution of CHA allows for controlled release of antibiotics, growth factors, or other therapeutic agents at implantation sites.
Safety and Storage
As a biocompatible material, CHA presents minimal toxicity risks. However, precautions should be taken to avoid inhalation of fine particles during handling, which may cause respiratory irritation. Industrial-scale processing should employ appropriate dust control measures. For long-term stability, CHA should be stored in moisture-proof containers at room temperature. Exposure to humid environments may lead to surface hydrolysis over time. Sterilization for medical applications is typically performed by gamma irradiation or ethylene oxide treatment, as autoclaving may alter the material's surface properties.
B2B Procurement Guide
When sourcing CHA, buyers should specify the carbonate content (usually 4-8 wt%), crystallinity degree, and particle size distribution appropriate for their application. Medical-grade material requires certification of heavy metal content and microbiological purity according to ISO 13485 or similar standards. Suppliers typically offer CHA in various forms: powders (nanoscale to micron-sized), porous blocks, or pre-formed granules. Pricing varies significantly based on purity (research grade vs. clinical grade), with bulk purchases (100kg+) often qualifying for 15-30% discounts. Lead times for custom formulations may range from 4-8 weeks.
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