The science behind hydroxyapatite-coated implants and why they matter for complex cases.
By Korea Dental Trip · Reviewed by Dr. Lee Cheol-gyu, DDS PhD
April 2026 · 6 min read
If you're researching dental implants, you've probably encountered terms like "titanium implant," "zirconia implant," and "HA-coated implant." Most US practices use standard titanium. But an increasing number of Korean specialists — particularly those treating complex cases — use hydroxyapatite (HA) coated implants. Here's what that means and why it matters.
Hydroxyapatite (HA) is a naturally occurring mineral form of calcium apatite. It's not some exotic lab creation — it's the primary mineral component of your actual bones and teeth. About 70% of bone and 97% of tooth enamel is made of hydroxyapatite.
When applied as a thin coating to a titanium implant through a process called plasma spraying, HA creates a surface that your bone cells recognize as biologically similar to natural bone. This fundamentally changes how your body responds to the implant.
Standard titanium implant: Bone cells gradually attach to the metal surface through a process called osseointegration. This works well for most patients but depends entirely on the body's ability to form new bone against an inorganic surface.
HA-coated titanium implant: The HA layer acts as a biological bridge between the metal and your bone. Bone cells (osteoblasts) attach to the HA surface more quickly and form stronger bonds. Studies show higher bone-to-implant contact percentages, faster initial stability, and better outcomes in patients with compromised healing.
For healthy patients with good bone density, standard titanium implants work perfectly well. The difference becomes significant for diabetic patients (slower healing, higher infection risk), osteoporosis patients (reduced bone density), elderly patients (slower bone formation), smokers (impaired blood flow), and patients who have failed with standard implants before.
A study in Cell and Trends in Biotechnology (2017) found 13.2% higher survival rates in type 2 diabetic patients with HA-coated implants compared to standard titanium.
Kainos Dental uses Himed HA-coated implants. The process: implant fixtures are precision-machined from Grade 5 Titanium in Korea, shipped to Himed Co. in the USA for HA plasma coating, then returned to Korea for sterilization and packaging. The same Himed facility coats implants for Osstem, Implant Direct, and Paragon systems — major global brands.
Grade 5 Titanium (Ti-6Al-4V) is stronger than the Grade 4 commercially pure titanium used in most standard implants. This matters for patients with reduced bone density, where mechanical strength compensates for less biological support.
Related guide: Dental Implants Korea: Complete Guide →
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