@article{kontakiotis_palamidakis_farmakis_tzanetakis_2010,  title={Comparison of isthmus detection methods in the apical third of mesial roots of maxillary and mandibular first molars: macroscopic observation versus operating microscope},  volume={21},  ISSN={0103-6440},  url={https://doi.org/10.1590/S0103-64402010000500009},  DOI={10.1590/S0103-64402010000500009},  number={5},  journal={Brazilian Dental Journal},  publisher={Fundação Odontológica de Ribeirão Preto},  author={Kontakiotis, Evangelos G. and Palamidakis, Fotios D. and Farmakis, Eleftherios-Terry R. and Tzanetakis, Giorgos N.},  year={2010},  pages={428–431} }