Comparison of light transmission of multilayered zirconia materials produced using different sintering methods

Aim: In multilayered zirconia blocks, the enamel layer consists of 5Y-TZP, whereas the transition and body layers consist of 3Y-TZP content. Zirconias, which have different compositions, can be sintered quickly and conventionally, but the effect of rapid sintering on light translucency is not fully known. The aim of this study was to investigate the effect of speed-sintering protocols on the light translucency of multilayered monolithic zirconia materials. Methodology: In this study, multilayered blocks underwent a speed sintering protocol: Katana Zirconia YML (Kuraray) and IPS e.max ZirCAD Prime (Ivoclar Vivadent). The samples were designed with a post-sintering diameter of 12 mm and thickness of 1 mm, and they were manufactured using a CAD/CAM milling machine (Onex Dental Coritec 350i). Samples obtained from the blocks were randomly divided into two groups and sintered in two different ways according to the sintering protocol (n=16). After sintering, L*, a*, b* values of all samples were measured with a spectrophotometer, and the measurements were recorded using black and white backgrounds. Translucency (TP) values were analyzed using a two-way analysis of variance (ANOVA) test to examine the effects of zirconia firing. Statistical analysis was performed using IBM SPSS. Results: The light translucency values of the ZirCAD Prime subgroup subjected to speed sintering were higher than those of the other groups. In the Katana YML group, no significant difference (p=0.161) was observed between the subgroups that sintered rapidly and conventionally. Conclusion: The differences in light translucency values may be attributed to variations in the amount and thickness of 5Y-TZP zirconia in the enamel layer. The light translucency of the Katana Zirconia YML block was not affected by the sintering protocol, demonstrating that this block can be safely speed-sintered. How to cite this article: Güntekin N, Kızılırmak B, Tunçdemir AR. Comparison of light transmission of multilayered zirconia materials produced using different sintering methods. Int Dent Res. 2024;14(S1):55-59 https://doi.org/10.5577/indentres.551