Improved osseointegration and interlocking capacity with dual acid-treated implants: a rabbit study.

Area of Science:

• Biomaterials Science
• Dental Implantology
• Surface Engineering

Background:

• Osseointegration is crucial for dental implant success.
• Surface microstructure significantly influences implant stability.
• Hydrofluoric acid (HF) treatment creates a rough surface, while dual acid treatment (AT-1) offers an alternative approach.

Purpose of the Study:

• To compare the osseointegration of implants with different nano- and microstructures.
• To test the hypothesis that AT-1 treatment on a reduced topography can match the performance of HF-treated rougher surfaces.
• To evaluate the impact of surface treatments on biomechanical and histomorphometric outcomes.

Main Methods:

• A preclinical rabbit study involving 30 rabbits and three groups of test and control implants.
• Test implants featured microstructures from coarse blasting, fine blasting, or turned surfaces, all treated with AT-1.
• Control implants were blasted with coarse particles and treated with HF; surface topography, removal torque, and bone-implant contact were assessed at 4 and 12 weeks.

Main Results:

• Group I (coarse blasted, AT-1) showed enhanced removal torque versus controls despite similar surface roughness (Sa).
• Group II (fine blasted, AT-1) demonstrated equivalent biomechanical performance to controls at 4 weeks, with decreased Sa.
• Group III (turned, AT-1) exhibited reduced biomechanical performance compared to controls.

Conclusions:

• Nano- and microstructure modification via AT-1 on blasted implants may improve initial biomechanical performance.
• Surface interlocking capacity appears more critical for osseointegration during longer healing durations.
• AT-1 treatment presents a promising alternative for modifying implant surfaces to enhance osseointegration.