Conventional NiTi

Conventional NiTi is the original, non-heat-treated nickel-titanium used in rotary endodontic files. Its austenite finish temperature (Af) sits below body temperature, so at 37°C the alloy is predominantly austenitic and superelastic: it flexes under load and springs back to its original shape, which means these files generally cannot be pre-bent. Conventional NiTi is stiffer than the martensitic heat-treated alloys (Gold, Blue, CM-Wire) and serves as the baseline reference against which their flexibility and cyclic-fatigue improvements are reported. It remains widely used and cost-effective, and is generally well suited to straighter canals and to clinicians who prefer the tactile feedback of a more rigid instrument.