eng Oriental Scientific Publishing Company Biosciences Biotechnology Research Asia 0973-1245 2014-04-28 11 1 6448 article S. Kishorekumar 1 Department of Orthodontics, Sree Balaji Dental College and Hospital, Bharath University, Narayanapuram, Pallikaranai, Chennai - 600 100, India. This study compared commercially available NiTi closed spring of three different companies for their force decay over a period of four weeks and the amount of extension that is needed for a spring to deliver an optimum sustained orthodontic force. https://www.biotech-asia.org/vol11no1/force-decay-characteristics-of-niti-closed-coil-spring-at-different-time-intervals/ NiTi Springs Force Degradation Martensitic plateau; Modulus of Elasticity; Spring Back