@article{peng_hui_wang_xin_deng_li_zhang_2015,  title={Cyclic fatigue resistance of two nickel-titanium instruments in different curving angles: a comparative study},  volume={29},  ISSN={1806-8324},  url={https://doi.org/10.1590/1807-3107BOR-2015.vol29.0122},  DOI={10.1590/1807-3107BOR-2015.vol29.0122},  number={1},  journal={Brazilian Oral Research},  publisher={Sociedade Brasileira de Pesquisa Odontológica - SBPqO},  author={PENG, Cheng and Hui, WU and WANG, Lei and Xin, HU and DENG, Shu and LI, Changyi and ZHANG, Lianyun},  year={2015},  pages={1–7} }