Translucency of shaded zirconia core material
Panagiota-Eirini Spyropoulou1, Emily C Giroux, Michael E Razzoog
1Department of Biologic and Materials Sciences, Division of Prosthodontics, The University of Michigan, School of Dentistry, Ann Arbor, MI 48109-1078, USA. pspyr@umich.edu
Statement Of Problem:
With the development of various zirconia core shades, questions arise regarding the effect of the shaded zirconia on the translucency of ceramic crowns.
Purpose:
The purpose of this study was to investigate the translucency of the 3 Procera Zirconia shaded core materials. The hypothesis was that differences exist in the translucency of various shaded zirconia cores.
Material And Methods:
Disk-shaped (0.6 ± 0.01 × 12 mm) zirconia core (Procera Zirconia) specimens (n=90) were fabricated by the manufacturer using a CAD/CAM process. The disks were fabricated in 3 groups according to shade (light, medium, intense) (n=30). A spectrophotometer was used to measure contrast ratio (CR) which is indicative of translucency. One-way ANOVA was conducted to determine significant differences among the shades (α=.05).
Results:
A significant difference in translucency between the light and intense shades (P=.030) and the medium and intense shades (P<.001) was observed. There was no significant difference between the light and medium shades (P=.15).
Conclusions:
Shaded zirconia is partially translucent. In addition, significant differences in translucency measurements were identified between specific shades.
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