Arthessarat Sirisa-Ard1, Sabrina Natalie Woodroffe Michael1, Kamal Ahmed1, Colin R Dunstan2, Simon G Pearce3, Ayse Aysin Bilgin4, Oyku Dalci5, M Ali Darendeliler1. 1. *Discipline of Orthodontics, Faculty of Dentistry and. 2. **Department of Biomedical Engineering, School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, New South Wales. 3. ***Surgical Research Australia Pty Ltd, North Adelaide, South Australia, and. 4. ****Department of Statistics, Faculty of Science, Macquarie University, Sydney, New South Wales, Australia. 5. *Discipline of Orthodontics, Faculty of Dentistry and oyku.dalci@sydney.edu.au.
Abstract
AIM: The purpose of this study was to assess the difference of removal torque values (RTV) and the bone-to-implant contact (BIC) between the sand-blasted, large grit, and acid-etched (SLA) surface-treated and the machined surface (MA) miniscrews. MATERIAL AND METHODS: Miniscrews used in this study were 6mm long with a diameter of 1.5mm. A total of 23 SLA miniscrews and 24 MA miniscrews were placed into the distal femoral condyle of 24 New Zealand rabbits. Removal torque test and the BIC was histologically evaluated at 0 and 8 weeks. RESULTS: There was no statistical difference between the RTV in the MA group versus the SLA group at both 0 and 8 weeks. Comparing 0-8 weeks, there was no significant difference in RTV of the SLA group (P = 0.48), however the change in the MA group was statistically significant (P = 0.006). Histological observation showed a significant decrease in BIC comparing 0 and 8 weeks for the MA group. The BIC ratio at 8 weeks was statistically significantly higher in the SLA group compared to the MA group. CONCLUSION: SLA surface preparation does not increase the RTV of miniscrews. Further investigations under loading and a large sample size are required.
AIM: The purpose of this study was to assess the difference of removal torque values (RTV) and the bone-to-implant contact (BIC) between the sand-blasted, large grit, and acid-etched (SLA) surface-treated and the machined surface (MA) miniscrews. MATERIAL AND METHODS: Miniscrews used in this study were 6mm long with a diameter of 1.5mm. A total of 23 SLA miniscrews and 24 MA miniscrews were placed into the distal femoral condyle of 24 New Zealand rabbits. Removal torque test and the BIC was histologically evaluated at 0 and 8 weeks. RESULTS: There was no statistical difference between the RTV in the MA group versus the SLA group at both 0 and 8 weeks. Comparing 0-8 weeks, there was no significant difference in RTV of the SLA group (P = 0.48), however the change in the MA group was statistically significant (P = 0.006). Histological observation showed a significant decrease in BIC comparing 0 and 8 weeks for the MA group. The BIC ratio at 8 weeks was statistically significantly higher in the SLA group compared to the MA group. CONCLUSION:SLA surface preparation does not increase the RTV of miniscrews. Further investigations under loading and a large sample size are required.