@article{costa_calheiros_ballester_gonçalves_2020,  title={Effect of three different attachment designs in the extrusive forces generated by thermoplastic aligners in the maxillary central incisor},  volume={25},  ISSN={2176-9451},  url={https://doi.org/10.1590/2177-6709.25.3.046-053.oar},  DOI={10.1590/2177-6709.25.3.046-053.oar},  number={3},  journal={Dental Press Journal of Orthodontics},  publisher={Dental Press International},  author={Costa, Rafael and Calheiros, Fernanda Calabró and Ballester, Rafael Yagüe and Gonçalves, Flávia},  year={2020},  month={May},  pages={46–53} }