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Surface Treatment Technology


Orthopaedic field


Aquala® is the world’s first technique for the successful graft polymerization of an MPC polymer with a cell membrane molecular structure onto the bearing surfaces (articular surfaces) of artificial hip joints. Using biomimetic technology we constructed surface structures that are similar to articular cartilage, and succeeded in simultaneously inhibiting the two main factors in the loosening of artificial hip joints: the production of wear debris, and bone resorption caused by wear debris. In gait loading tests equivalent to 15 years or more, the production of wear debris was reduced by about 99% compared to KYOCERA Medical Corporation’s conventional products; thus this technology holds the promise to greatly increase the endurance and product life of artificial hip joints.

AHFIX® Technology

Orthopaedic field


AHFIX® (alkaline heating) technology is a surface treatment technology which can provide bioactivity to a titanium metal. Titanium metal, covered by thin oxidized layers, is chemically stable making it suitable to be widely used for biomaterial of artificial joints. Generally, titanium alloy will not directly bond with the bones inside a living body. However, the layer directly binding to bones is formed on the surface of titanium metal through NaOH solution immersion treatment, cleansing and 600C heat treatment in the atmosphere.

PROARC® HA Technology

Orthopaedic field


PROARC® HA technology is a surface treatment technology that coats HA by inert gas-shielded arc welding (PROARC®) on to the porous surface of pure titanium. With this PROARC® HA technique, the HA layer conducts and bone grows on the rough surface of a PROARC® layer shortly after the operation, improving initial fixation to the bone. After the completion of a curing process, firmer and more stable fixation seems to be supported by the rough surface layer of pure titanium.

Bottom Coating Technology

Orthopaedic field

The porous surface of prostheses allows living bone tissue to merge, which may result in producing high fixation. Bottom coating technology is a coating technology in which the bottom of the pore is coated with bioactive material such as AW glass ceramics, which enables the living bone tissue to enter the deep pore and enhances binding with the living bone.

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HA Coating Technology

Dental field

HA coating technology is used to coat fixtures with hydroxyapatite (HA). HA is a main ingredient of bone and teeth of vertebrate and a compound of chemical formula Ca10(PO4)6(OH)2 which is chemically synthesized from phosphoric acid, calcium hydroxide, and others.

Comparison of the early osteoconductivity between an HA coated titanium fixture and an anodic oxidized titanium fixture

All images of the histological specimen were processed using an image analyzing software, to extract the contact surfaces between newly formed bone tissue and the material surface at Week 2, 4 and 8 after the operation to measure the contact area with the bone. The contact area was greater in the HA coated titanium fixture than the anodic oxidized titanium fixture at Week 2, 4 and 8 after the placement. The SEM image at Week 8 also indicated that the HA coating layer was tightly bound to the highly calcified dense newly formed bone.

Bone contact rate (%)

Specimen Week 2 Week 4 Week 8
POI/HA 75.8 (n=5) 84.5 (n=5) 74.3 (n=5)
POI 53.1 (n=4) 63.0 (n=5) 45.7 (n=4)

*Bone contact rate:
(Length of a site which is in direct contact with the implant, and not through the fibrous tissue) ? (Full length of the interface between the bone and the implant) x 100

SEM image of the contact between the bone and the HA coating/ implant (Week 8)

SEM image of the contact between the bone
and the HA coating / implant (Week 8)