@article{ioannidis_mistakidis_beltes_karagiannis_2013,  title={Spectrophotometric analysis of crown discoloration induced by MTA- and ZnOE-based sealers},  volume={21},  ISSN={1678-7757},  url={https://doi.org/10.1590/1678-7757201302254},  DOI={10.1590/1678-7757201302254},  number={2},  journal={Journal of Applied Oral Science},  publisher={Faculdade De Odontologia De Bauru - USP},  author={Ioannidis, Konstantinos and Mistakidis, Ilias and Beltes, Panagiotis and Karagiannis, Vassilis},  year={2013},  month={Mar},  pages={138–144} }