Hydroxyapatite-based composite for dental implants: an in vivo removal torque experiment

Area of Science:

• Biomaterials Science
• Orthopedic Research
• Dental Implantology

Background:

• Commercially pure titanium (c.p. Ti) is a standard material for dental implants.
• Hydroxyapatite (HA)-based composites offer potential for improved mechanical and biological properties.
• Enhancing the mechanical strength and osteointegration of dental implant materials is crucial.

Purpose of the Study:

• To fabricate and evaluate HA-based composite dental implants.
• To compare the mechanical properties and in vivo osteointegration of HA-based composites with c.p. Ti.
• To assess the suitability of HA-based composites for artificial dental implants.

Main Methods:

• Screw-shaped dental implants were fabricated using c.p. Ti and HA-based composites (HA mixed with Al(2)O(3)-coated ZrO(2) powders).
• Mechanical properties of the composite materials were assessed.
• Implants were surgically placed into rabbit tibiae for in vivo evaluation.
• Osteointegration was quantified by measuring removal torque after a 6-week healing period using a torque gauge.

Main Results:

• HA-based composites exhibited a threefold enhancement in mechanical properties compared to controls.
• Implants made from HA-based composites demonstrated an approximately twofold higher removal torque than c.p. Ti implants (p < 0.05).
• The results indicate excellent biocompatibility and bone integration for the HA-based composite implants.

Conclusions:

• HA-based composites possess superior mechanical properties and comparable bioactivity to HA.
• The enhanced removal torque suggests excellent osteointegration and biocompatibility.
• HA-based composite materials are a promising candidate for the development of advanced artificial dental implants.