Conclusion. Multilayered Zirconia products created with different yttria contents by layer have lower flexural strength than those made with gradient shade technological know-how and exactly the same yttria material for every layer. Thus, several factors like the form of prostheses, nesting techniques of prostheses in the zirconia disc, and the https://www.directivepublications.org/journal-of-dentistry-and-oral-research/