Effect of Aging on the Microstructure and Optical Properties of Translucent Zr[O.sub.2] Ceramics/Utjecaj starenja na mikrostrukturu i opticka svojstva translucentne Zr[O.sub.2] keramike

Objectives: The development and placement of translucent zirconia ceramics on the dental materials market is in full swing. This research aimed to investigate how aging protocols affect the microstructure, color parameters and translucency of a new-generation monolithic zirconia ceramic. Material an...

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Veröffentlicht in:Acta stomatologica croatica 2021-06, Vol.55 (2), p.114
Hauptverfasser: Mesic, Korina, Majnaric, Igor, Mehulic, Ketij
Format: Artikel
Sprache:eng
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Zusammenfassung:Objectives: The development and placement of translucent zirconia ceramics on the dental materials market is in full swing. This research aimed to investigate how aging protocols affect the microstructure, color parameters and translucency of a new-generation monolithic zirconia ceramic. Material and methods: Translucent zirconia ceramics KATANA-Zirconia STML with different surface treatments (as sintered - control, glazed, polished) was tested using two aging protocols (hydrothermal degradation in autoclave at 134 [degrees]C and 2 bars for three hours, chemical degradation in four-percent acetic acid at 80 [degrees]C for 16 hours) in order to examine phase composition usingX-ray diffraction analysis and AE, AL and AC color parameters through spectrophotometry. The translucency parameter (TP) was calculated using parameters L*, a* and b* on a black and white surface. Results: Regardless of the surface treatment, aging protocols did not cause a tetragonal-to-monoclinic phase transformation, although hydrothermal degradation in the autoclave transformed the hybrid tetragonal-cubic structure of all specimens to a tetragonal one. All polished and glazed specimens during chemical degradation demonstrated a significant color change [DELTA]E. Lightness [DELTA]L significantly changed in polished specimens aged in the autoclave. In all specimens, [DELTA]C underwent a change manifested through statistically insignificant yellowing. None of the aging protocols altered the translucency of specimens. Conclusions: Aging, regardless of the final surface treatment, did not manifest a monoclinic phase in the specimens. A tetragonal-cubic microstructure dominates. Unlike polishing, glazing the surface of translucent zirconia ceramics contributed to minor changes in color, lightness and chromaticity. The translucency of translucent zirconia ceramics remains stable regardless of aging and surface treatment. MeSH terms: Dental Materials; Zirconium Author keywords: Translucent zirconia; Monolithic zirconia; Cubic zirconia Svrha: Trziste dentalnih materijala u punom je zamahu kad je rijec o razvoju i plasiranju translucentnih cirkonij-oksidnih keramika. Cilj ovog istrazivanja bio je ispitati utjecaj protokola starenja na mi-krostrukturu, kolorne parametre i translucenciju nove generacije monolitne cirkonij-oksidne keramike. Materijal i postupci: Translucentna cirkonij-oksidna keramika KATANA-Zirconia STML s razlicitim nacinima obrade povrsine (bez obrade, glazirana, polirana) te
ISSN:0001-7019
DOI:10.15644/aSc55/2/1