Translucency of zirconia-based pressable ceramics with different core and veneer thicknesses
- Authors
- Jeong, Il-Do; Bae, So-Yeon; Kim, Dong-Yeon; Kim, Ji-Hwan; Kim, Woong-Chul
- Issue Date
- 6월-2016
- Publisher
- MOSBY-ELSEVIER
- Citation
- JOURNAL OF PROSTHETIC DENTISTRY, v.115, no.6, pp.768 - 772
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PROSTHETIC DENTISTRY
- Volume
- 115
- Number
- 6
- Start Page
- 768
- End Page
- 772
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/88417
- DOI
- 10.1016/j.prosdent.2015.11.003
- ISSN
- 0022-3913
- Abstract
- Statement of problem. Little information is available on the translucency of zirconia-based pressable ceramic restorations with a pressed ceramic veneer and zirconia core in various thickness combinations. Purpose. The purpose of this in vitro study was to assess the translucency of 3 types of zirconia-based pressable ceramics for different core-veneer thickness combinations. Material and methods. A bilayered ceramic specimen was prepared with a pressable ceramic (IPS e.max Zirpress, Initial IQ, Rosetta UltraPress) veneer over a zirconia core (Zenostar Zr). Three groups of specimens (n=7) were formed with the following core+veneer thicknesses: 1 +0.5 mm, 0.7 +0.8 mm, and 0.5 +1 mm. To obtain consistent thickness and high translucency, all specimens were subjected to surface grinding with a grinding machine. To eliminate the effect of differences in roughness on the translucency, the surface roughness of the ground specimens was measured with a scanning profiler, and the consistency of these measured values was verified through statistical analysis. The luminous transmittance of the specimens was measured with a spectrophotometer. The effects of the pressable ceramic type and core-veneer thickness combination on transmittance were assessed using a 2-way ANOVA (alpha=.05). Results. The consistency of the surface roughness among the tested specimens was confirmed using a 1-way ANOVA and the Tukey HSD post hoc test (P<.05). The luminous transmittance exhibited a statistically significant dependence on both the type of pressable ceramic and the core-veneer thickness combination (P<.05). Conclusions. The type of pressable ceramic and core-veneer thickness combination affected the translucency of the restoration.
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