Plasma sprayed coatings of hydroxylapatite

Area of Science:

• Biomaterials science
• Orthopedic implant technology
• Surface engineering

Background:

• Titanium implants are widely used in orthopedics.
• Hydroxylapatite coatings enhance implant osseointegration.
• Plasma spraying is a common method for applying such coatings.

Purpose of the Study:

• To evaluate the bond strength of plasma-sprayed hydroxylapatite coatings on titanium.
• To assess the effect of plasma spraying on the fatigue properties of titanium substrates.
• To compare the in vivo histological response to apatite coatings with bulk apatite materials.

Main Methods:

• Plasma spraying was used to deposit hydroxylapatite coatings onto titanium substrates.
• Bond strength was measured using established mechanical testing methods.
• Fatigue testing was performed on coated and uncoated titanium samples.
• Animal studies were conducted to evaluate histological reactions.

Main Results:

• The plasma spraying technique successfully produced thin, dense hydroxylapatite coatings.
• The bond strength between the apatite coating and titanium substrate was quantified.
• No detrimental influence of the coating process on the substrate's fatigue properties was observed.
• Animal studies revealed histological reactions to the apatite coatings comparable to those of bulk apatite materials.

Conclusions:

• Plasma-sprayed hydroxylapatite coatings on titanium demonstrate favorable bond strength.
• The plasma spraying process does not compromise the fatigue performance of titanium substrates.
• Hydroxylapatite coatings exhibit good biocompatibility in vivo, similar to bulk apatite.