A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Effect of speed sintering of monolithic zirconia with different yttria contents on color and crystal phase
Tekijät: Miura Shoko, Shinya Akikazu, Koizumi Hiroyasu, Fujisawa Masanori
Kustantaja: WILEY
Julkaisuvuosi: 2022
Lehti: European Journal of Oral Sciences
Tietokannassa oleva lehden nimi: EUROPEAN JOURNAL OF ORAL SCIENCES
Lehden akronyymi: EUR J ORAL SCI
Vuosikerta: 130
Numero: 6
Sivujen määrä: 13
ISSN: 0909-8836
DOI: https://doi.org/10.1111/eos.12898
Julkaisun avoimuus kirjaamishetkellä: Ei avoimesti saatavilla
Julkaisukanavan avoimuus : Osittain avoin julkaisukanava
Verkko-osoite: https://doi.org/10.1111/eos.12898
Tiivistelmä
This study evaluated the color and microstructure of monolithic zirconia crowns with different yttrium oxide (Y2O3) contents treated by conventional or speed sintering. Four types of zirconia ceramics were assessed: two monolayer zirconia, and two multilayer zirconia. The monolithic zirconia crowns were fabricated using a dental computer-aided design/computer-aided manufacturing (CAD/CAM) system and in two shades (A2 and BL). After milling, the zirconia crowns were sintered using either speed sintering or conventional sintering. For each combination of zirconia (4), shade (2), and sintering condition (2), the color parameters were determined at three positions of each of nine crowns using a non-contact dental spectrophotometer. In addition, the zirconia phases in the specimens were quantified using X-ray diffractometry. Significant differences in the Delta E-00 values at different measurement positions were observed for the Multi2 crown of the BL shade group. The color difference resulting from conventional and speed sintering programs was not affected by the difference in yttria content of Mono1, Mono2, and Multi1. However, in Multi2, containing 3Y-TZP and 5Y-PSZ, a color change was caused by the use of speed sintering. Therefore, when performing speed sintering with Multi2, it is necessary to select the color in consideration of these results or take measures for staining.
This study evaluated the color and microstructure of monolithic zirconia crowns with different yttrium oxide (Y2O3) contents treated by conventional or speed sintering. Four types of zirconia ceramics were assessed: two monolayer zirconia, and two multilayer zirconia. The monolithic zirconia crowns were fabricated using a dental computer-aided design/computer-aided manufacturing (CAD/CAM) system and in two shades (A2 and BL). After milling, the zirconia crowns were sintered using either speed sintering or conventional sintering. For each combination of zirconia (4), shade (2), and sintering condition (2), the color parameters were determined at three positions of each of nine crowns using a non-contact dental spectrophotometer. In addition, the zirconia phases in the specimens were quantified using X-ray diffractometry. Significant differences in the Delta E-00 values at different measurement positions were observed for the Multi2 crown of the BL shade group. The color difference resulting from conventional and speed sintering programs was not affected by the difference in yttria content of Mono1, Mono2, and Multi1. However, in Multi2, containing 3Y-TZP and 5Y-PSZ, a color change was caused by the use of speed sintering. Therefore, when performing speed sintering with Multi2, it is necessary to select the color in consideration of these results or take measures for staining.
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