Optical properties and flexural strength of translucent zirconia layered with high-translucent zirconia
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- SAKAI Takanori
- Department of Fixed Prosthodontics, Tokyo Dental College Oral Health Science Center, Tokyo Dental College
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- SATO Toru
- Department of Fixed Prosthodontics, Tokyo Dental College
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- HISANAGA Ryuichi
- Department of Fixed Prosthodontics, Tokyo Dental College
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- SHINYA Akimasa
- Department of Fixed Prosthodontics, Tokyo Dental College
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- TAKEMOTO Shinji
- Department of Biomedical Engineering, Iwate Medical University
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- YOSHINARI Masao
- Oral Health Science Center, Tokyo Dental College
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Abstract
<p>This study investigated the optical properties and flexural strength of translucent TZP layered with high-translucent PSZ using resin cement of various shades. Zirconia specimens (translucent TZP; Zpex and high-translucent PSZ; ZpexSmile) were 13 mm in diameter, layered at thickness ratios of 0.3/0.7, 0.5/0.5, and 0.7/0.3 mm (ZpexSmile/Zpex), and then luted using resin cement of 3 shades. Monolithic specimens of both were used as controls. CIE L*a*b* color coordinates and translucency parameter (TP) were evaluated as optical properties. Biaxial flexural strength was also determined as a mechanical evaluation. The a* and b* values of layered specimens varied depending on the shade of cement. TP values were not affected by shade of cement and thickness ratio. The biaxial flexural strength was intermediate value between both monolithic specimens. The layering method of zirconia with various translucencies using resin cement of different shades can improve color expression while maintaining clinically sufficient flexural strength.</p>
Journal
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- Dental Materials Journal
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Dental Materials Journal 38 (3), 368-377, 2019-05-29
The Japanese Society for Dental Materials and Devices