Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Orthodontics

Introduction: Anchorage demands are sometimes maximized. Disadvantages of conventional approaches do exist. Those disadvantages were overcome byminiscrew 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 wereexamined 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 after12 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

Issued also as CD