N. Polychronakis, P. . Lagouvardos, G. . Polysois, and H. C. . Ngo, “Intra- and inter-brand color differences of denture teeth under different illuminations”, J Appl Oral Sci, vol. 28, p. e20190693, Aug. 2021, doi: 10.1590/1678-7757-2019-0693 .