الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
Introduction:
Anchorage demands are sometimes maximized. Disadvantages of conventional
approaches do exist. Those disadvantages were overcome by miniscrew implants
(MSIs). MSIs fail more than other skeletal anchors. Surface treatments are known
to increase the surface area and result in greater bone coverage, hence improving
their stability.
Methods:
32 MSIs were divided into 4 groups. The first group served as control, the second
was immersed in 10% weight PPA for 24h at room temperature, the third was
sandblasted using micro-etcher with 50 Al2O3 particles for 2 minutes, and the forth
was sandblasted then acid etched. Then the sample was cleaned using ethanol in
ultrasonic-cleaner for 10 minutes, and were examined with SEM at 100X, 200X,
500X, and 2000X. Each of the canine models received 4 MSIs in the mandible,
which were kept for 12 weeks. RFA was performed twice; T1 immediately after
insertion, and T2 after 12 weeks.
Results:
Surface topography modification was successfully performed. There was no
statistically significant difference between ISQ values among all groups neither at
T1 nor T2.
Conclusions:
Clinical stability of MSIs treated either with sandblasting, acid etching, combined
sandblasting and acid etching; is not different from that of the as-machined MSIs.