English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

R otary files made of nickel titanium (NiTi) alloy are widely used in endodontics to prepare root canals.[1] Although NiTi alloys have many advantages, failures occur in files during endodontic treatments because of metal fatigue of the alloy.[2] It is difficult to prevent this undesirable situation, with breakage occurring due to torsional or cyclic fatigue. Torsional fatigue occurs when the tip or part of the instrument becomes stuck inside the canal and the shaft of the file continues to rotate.[3] When the torque exceeds the elastic limit of the metal, the tip of the instrument fractures. [4] When the instrument is used in curved canals, tensile or compressive stress occurs along the shaft of the instrument.[5] In cyclic fatigue, the continuous repetition of these forces leads the instrument to break unexpectedly.[6] In response to the failures seen in NiTi files, the manufacturers of these files altered the structure or manufacturing methods of the alloys. Subsequently, NiTi rotary files made of NiTi controlled memory (CM) wire was introduced to the market.[7,8] According to the manufacturers, the cyclic fatigue resistance of this CM alloy, which is produced by heat-treating conventional NiTi alloy-based files using thermomechanical processes, is much higher than that of conventional NiTi files.[9] Examples of these new CM-based files are HyFlex CM (HF CM; Coltene/WhaleORIGINAL ARTICLE

Comparison of the Cyclic Fatigue Resistance of Nickel-Titanium Rotary Instruments Manufactured using Controlled Memory Wire