@article{chang_hong_2014,  title={Effects of layering technique on the shade of resin overlays and the microhardness of dual cure resin cement},  volume={28},  ISSN={1806-8324},  url={https://doi.org/10.1590/1807-3107BOR-2014.vol28.0016},  DOI={10.1590/1807-3107BOR-2014.vol28.0016},  number={1},  journal={Brazilian Oral Research},  publisher={Sociedade Brasileira de Pesquisa Odontológica - SBPqO},  author={Chang, Hoon-Sang and Hong, Sung-Ok},  year={2014},  pages={01–06} }