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Optimal Conditions for Absorbable Fixation of Hydroxyapatite Ceramic Implants
Yoshiaki Sakamoto1, Kazuo Kishi
1Department of Plastic and Reconstructive Surgery, Keio University School of Medicine, Tokyo, Japan.
The Journal of Craniofacial Surgery
|December 30, 2017
Summary
This study found that larger pore sizes in synthetic hydroxyapatite (HAP) implants, combined with longer, thinner bioabsorbable pins, significantly improve fixation stability in craniofacial surgery. Optimal fixation was achieved with 7mm x 1.6mm pins in large-pore HAP.
Area of Science:
- Biomaterials Science
- Craniofacial Surgery
- Orthopedic Implants
Background:
- Synthetic hydroxyapatite (HAP) implants are widely used in craniofacial surgery.
- A significant challenge with HAP implants is achieving stable fixation.
- A novel ultrasound-assisted pinned resorbable fixation system offers a potential solution.
Purpose of the Study:
- To investigate the efficacy of a resorbable fixation system for HAP implants.
- To determine the optimal HAP porosity and bioabsorbable pin characteristics for fixation strength.
Main Methods:
- Hydroxyapatite blocks with varying porosities (0%, 35%, 50%) were synthesized.
- Bioabsorbable pins of different diameters (1.6mm, 2.1mm) and lengths (4mm, 7mm) were tested.
- Pull-out tests and microscopic analysis were employed to evaluate fixation stability.
Main Results:
- 7mm x 1.6mm pins demonstrated superior pull-out strength across all HAP porosities compared to 4mm pins.
- Large-pore HAP (50% porosity) with 7mm x 1.6mm pins exhibited the highest fixation strength.
- Microscopic analysis revealed pin liquefaction and flow into large pores, enhancing fixation.
Conclusions:
- Fixation strength of HAP implants is significantly influenced by HAP porosity and pin dimensions.
- The combination of large-pore HAP and longer, thinner bioabsorbable pins provides optimal implant stability.
- This resorbable fixation system shows promise for improving HAP implant outcomes in craniofacial reconstruction.
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