Effect of low-temperature degradation and sintering protocols on the color of monolithic zirconia crowns with different yttria contents
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- MIURA Shoko
- Division of Fixed Prosthodontics, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry Department of Biomaterials Science and Turku Clinical Biomaterials Center-TCBC, Institute of Dentistry, University of Turku
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- SHINYA Akikazu
- Department of Dental Materials Sciences, School of Life Dentistry at Tokyo, The Nippon Dental University Department of Prosthetic Dentistry and Biomaterials Science, Institute of Dentistry, University of Turku
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- KOIZUMI Hiroyasu
- Department of Dental Materials, Nihon University School of Tokyo
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- VALLITTU Pekka
- Department of Biomaterials Science and Turku Clinical Biomaterials Center-TCBC, Institute of Dentistry, University of Turku Department of Prosthetic Dentistry and Biomaterials Science, Institute of Dentistry, University of Turku Welfare District of County of Southwest Finland
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- LASSILA Lippo
- Department of Biomaterials Science and Turku Clinical Biomaterials Center-TCBC, Institute of Dentistry, University of Turku
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- FUJISAWA Masanori
- Division of Fixed Prosthodontics, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry
抄録
<p>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.</p>
収録刊行物
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- Dental Materials Journal
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Dental Materials Journal 43 (2), 164-171, 2024-03-25
一般社団法人 日本歯科理工学会