A1 Refereed original research article in a scientific journal
Effect of low-temperature degradation and sintering protocols on the color of monolithic zirconia crowns with different yttria contents
Authors: Miura Shoko, Shinya Akikazu, Koizumi Hiroyasu, Vallittu Pekka, Lassila Lippo, Fujisawa Masanori
Publisher: Japanese Society for Dental Materials and Devices
Publication year: 2024
Journal: Dental Materials Journal
Journal name in source: Dental materials journal
Volume: 43
Issue: 2
eISSN: 1881-1361
DOI: https://doi.org/10.4012/dmj.2023-194
Web address : https://www.jstage.jst.go.jp/article/dmj/43/2/43_2023-194/_article/-char/en
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/387697031
This study investigated the effects of low-temperature degradation (LTD) on the L*, a*, and b* values of highly translucent zirconia crowns. Four types of zirconia disks with different yttria contents (IPS e.max ZirCAD LT, IPS e.max ZirCAD MT, IPS e.max ZirCAD MT Multi, IPS e.max ZirCAD Prime, Ivoclar) and two shades (A2 and BL) were used. A crown was manufactured using four types of zirconia and LTD treated. Color measurements were performed, and the color difference (ΔE00) before and after LTD was calculated. The microstructure was determined through X-ray fluorescence and X-ray diffractometry. Highly translucent zirconia crowns showed greater changes in the a* and b* values than in the L* value after LTD, regardless of the shade. The Multi2 crowns exhibited a discernible color change due to the LTD treatment. The X-ray fluorescence results did not reveal any apparent change in the microstructure between sintering programs for all zirconia specimens.
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