Translucency of IPS e.max and cubic zirconia monolithic crowns

Although several monolithic zirconia ceramics have recently been introduced, the need for improved optical properties remains. The newest cubic-zirconia has been claimed to have optimal translucency characteristics for esthetic restorations. This in vitro study evaluated the optical properties of no...

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Bibliographic Details
Published in:The Journal of prosthetic dentistry 2018-08, Vol.120 (2), p.269-275
Main Authors: Baldissara, Paolo, Wandscher, Vinícius Felipe, Marchionatti, Ana Maria Estivalete, Parisi, Candida, Monaco, Carlo, Ciocca, Leonardo
Format: Article
Language:English
Subjects:
Ceramics
Color
Computer-Aided Design
Crowns
Dental Materials - chemistry
Dental Porcelain - chemistry
Dental Prosthesis Design
Dentistry
Humans
Light
Materials Testing
Optical Phenomena
Spectrophotometry
Surface Properties
Zirconium - chemistry
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Summary:Although several monolithic zirconia ceramics have recently been introduced, the need for improved optical properties remains. The newest cubic-zirconia has been claimed to have optimal translucency characteristics for esthetic restorations. This in vitro study evaluated the optical properties of novel cubic ultratranslucent (UT) and supertranslucent (ST) zirconia by comparing them with lithium disilicate (L-DIS) glass-ceramic for the manufacture of monolithic computer-aided design and computer-aided manufacturing (CAD-CAM) molar crowns. The UT and ST multilayered zirconia and the low-translucency grade L-DIS were milled. Eighty monolithic crowns were made from 2 CAD files, corresponding to thicknesses of 1.0 and 1.5 mm, and subdivided (n=20) into 4 groups: UT1.0, UT1.5, ST1.0, and L-DIS1.5. All groups were shaded using A2 color standard. Translucency of the crowns was measured by total transmission, using a photoradiometer in a dark chamber; furthermore, the contrast ratio was analyzed using a dental spectrophotometer applied to the buccal surface of the crowns. Data were analyzed using the Kruskal-Wallis and post hoc multiple Mann-Whitney U tests with Bonferroni correction (α=.05 divided by the number of tests performed in each set). When the ceramic types were analyzed, using total transmission and contrast methods, they showed significantly different translucency levels: UT1.0>ST1.0>UT1.5>L-DIS1.5 (total transmission P
ISSN:0022-3913
1097-6841
DOI:10.1016/j.prosdent.2017.09.007