@article{albertini_cremonini_palone_2021,  title={Comparative Analysis of Stiffness of Lingual Appliances: An <i>in Vitro</i> Study},  volume={21},  ISSN={1983-4632},  url={https://doi.org/10.1590/pboci.2021.085},  DOI={10.1590/pboci.2021.085},  journal={Pesquisa Brasileira em Odontopediatria e Clínica Integrada},  publisher={Associação de Apoio à Pesquisa em Saúde Bucal},  author={Albertini, Paolo and Cremonini, Francesca and Palone, Mario},  year={2021},  pages={e0024} }