[The experimental study of a Russian orthodontic mini-screw].

BACKGROUND: The aim of this research is the experimental study measuring stability of the orthodontic miniscrews <<Turbo>> designed in Russia in comparison with its foreign analogues, namely, <<Vector Tas>> (USA) and <<BioRay>> (Taiwan). MATERIAL AND METHODS: Four self-drilling orthodontic miniscrews of each manufacturer, i.e. <<Vector Tas>>, USA, (10-mm length, 2-mm diameter), <<BioRay>>, Taiwan, (10-mm length, 2-mm diameter), <<Turbo>>, Russia, (9-mm length, 2-mm diameter), a total of 12 items, were inserted into native pig mandible sample. Their stability was estimated by torques using a dynamometer (Zahoransky AG, Germany) and <<Periotest>> device (<<Periotest M>>, Germany). This experiment was conducted in native pig mandible sample immediately after the screws' placement and in 7 days after loading at an angle 70 degrees . RESULTS: After application of a load, the decreased torque values and increased Periotest values were registered in all orthodontic miniscrews. CONCLUSION: Orthodontic miniscrews <<Turbo>> designed in Russia are slightly inferior to <<VectorTas>> miniscrews and superior to <<BioRay>> miniscrews in primary stability and stability after 7 days under loading.