Flexural strength of high yttrium oxide-doped monochrome and multilayer fully stabilized zirconia upon various sintered cooling rate.

S- and N-cooling resulted in significantly higher flexural strength than that obtained by F-cooling. Increasing the cooling rate of 5Y-PSZ resulted in smaller grain size, less grain boundary integration, and higher t- to m- transformation, leading to lower strength. Therefore, a slow and normal cooling rate was recommended to achieve the optimum strength for 5Y-PSZ. This article is protected by copyright. All rights reserved.