In vitro study on the stability of mini-implants under simulated orthodontic loading conditions

Orthodontic mini-implants provide essential skeletal anchorage but their clinical success varies due to differences in mechanical stability under functional loading. Therefore, it is of interest to compare the stability of three commercially available designs-dual- thread, single-thread and tapered-using synthetic bone blocks. Primary stability was assessed by insertion torque and resonance frequency analysis, followed by cyclic loading to evaluate secondary stability, displacement and failure rates. Dual-thread implants demonstrated superior performance with higher stability, lower displacement and fewer failures compared to the other designs. Thus, we show that implant design plays a critical role, with dual-thread configurations offering clear clinical advantages for anchorage-dependent orthodontic treatments.