Characterization of mini-implants used for orthodontic anchorage

Introduction: The reduced diameter and ease of insertion of miniimplants help to minimize errors while preventing accidents that may result from surgeon error or contact between screw thread and tooth root. As diameter decreases, however, the risk of fracture increases. Methods: This study analysed four Brazilian commercial brands of miniimplant (INP, SIN, Conexão and Neodente) and one German brand (Mondeal) with the purpose of identifying key miniimplant features which make for good anchorage performance. The authors observed miniimplant composition and design and performed the mechanical testing of torque at fracture (in vitro study), whose values were subjected to analysis of variance (ANOVA) and Tukey’s test. Results: Results showed that all the mini-implants tested are suitable for clinical use as reinforcement of orthodontic anchorage.