Assessment of mini-implants resistance to torsion after clinical use and recycling process

Vol. 15 – Number 58 – 2022 Original article Page 68-72 Assessment of mini-implants resistance to torsion after clinical use and recycling process Rodnei Luis Dezordi1 Bruno da Silva Vieira2 Sandro Henrique Batista Santos1 Rodrigo Hermont Cançado3 Fabrício Pinelli Valarelli4 Karina Maria Salvatore Freitas5 Abstract Objective: The objective of the present study was to evaluate the influence of clinical use and the recycling process on torsion values and on the mechanical resistance to fracture of mini-implants. Material and methods: Thirty-four self-drilling titanium (Ti-6AI-4V) mini-implants of the same commercial brand, 1.5 mm in diameter, 8.0 mm in length and 2.0 mm transmucosal profile that were selected and divided into two groups: Group 1 consisted of 24 mini-implants inserted in the maxilla and mandible of 17 patients under orthodontic treatment, and that after 4 months were removed and submitted to recycling processes, including cleaning and sterilization. Group 2 (control) consisted of 10 mini-implants as marketed by the manufacturer. The insertion torque values and the maximum torque at the time of the mini- implant fracture were performed on the universal testing machine (EMIC). To compare data between groups, independent t was performed (p> 0.05). Results: There was no statistically significant difference in the torsion resistance test between the groups analyzed. Conclusion: It can be concluded that the mini-implants recycling process did not influence values of torsion resistance, remaining within the limit recommended by the manufacturer for its clinical use. Descriptors: Orthodontic anchorage procedures, corrective Orthodontics, sterilization. 1 Master in Dentistry – Orthodontics – UNINGÁ. 2 Master in Dentistry – Orthodontics – UNINGÁ, Dr. in Orthodontics from FOB-USP. 3 Master and Dr. in Orthodontics – FOB-USP, Prof. – UFMG. 4 Master and Dr. in Orthodontics – FOB-USP, Prof. of the Professional Master’s Degree in Dentistry – UNINGÁ. 5 Master and Dr. in Orthodontics – FOB-USP, Coord. of the Professional Master’s Degree in Dentistry – UNINGÁ. DOI: 10.24077/2022;1558-0193487