Summary. Multilayered zirconia supplies generated with distinct yttria contents by layer have reduced flexural toughness than those manufactured with gradient shade technology and exactly the same yttria written content for every layer. Consequently, numerous aspects like the sort of prostheses, nesting strategies of prostheses inside the zirconia disc, and the https://www.directivepublications.org/journal-of-dentistry-and-oral-research/