Influence of dentin and core porcelain thickness on the color of fully sintered zirconia ceramic restorations

Sarıdağ

Dental Materials Journal

et al. 2016

The purpose of this study was to evaluate the radiopacity of different yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramics used in the fabrication of fixed dental prostheses. Disk-shaped specimens (N=120, n=30 per group) were fabricated with thicknesses of 0.3, 0.5, and 1 mm from the following four Y-TZP ceramics: Cercon ht (Degudent) (CZ), Prettau (Zirkonzahn) (ZZ), Alliance (Kuraray Noritake Dental) (NA), and Ice Zirkon (Zirkonzahn) (ICE). The optical densities of each material were measured from radiographic images, and each material (N=1) were characterized by using XRD and SEM. The results were analyzed with oneway analysis of variance and the Tukey-Kramer test (α=0.05). In the case of the ICE and NA specimens, the radiopacity significantly differed with thickness (p<0.05). However, the radiopacities of 0.5-and 0.3-mm-thick CZ and ZZ specimens were not significantly different (p>0.05). Full-contour Y-TZP materials have higher radiopacities than those of the conventional Y-TZP materials in decreased thicknesses.

Section: Discussionmentioning

confidence: 99%

Comparative radiopacity of conventional and full-contour Y-TZP ceramics

Sarıdağ

Dental Materials Journal

et al. 2016

“…Color differences (DE*ab 5 1.19) were found after aging. Several studies have investigated the optical behavior of zirconia, evaluating the influence of the number of firing cycles 31,32 ; glaze application 33 ; type and shade of the infrastructure 34 ; thickness of the veneering ceramic 31,32,35,36 ; and the degree of opalescence or translucency of the zirconia. [23][24][25][26] These studies contributed to the understanding of the optical behavior of dental zirconia.…”

Section: Introductionmentioning

confidence: 99%

Influence of Accelerated Aging on the Color Stability of Dental Zirconia

Volpato¹,

César

Bottıno

2016

J Esthet Restor Dent

“…However, the color of the latter may greatly influence the appearance of the whole restoration and may hamper adequate esthetics [6]. Therefore, besides physical-chemical testing, the materials ability to mimic the natural tooth substance with regard to translucency, opalescence, and overall color is also important when screening and evaluating potential restorative materials and combinations thereof [7].…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric Evaluation of Polyetheretherketone (PEEK) as a Core Material and a Comparison with Gold Standard Core Materials

et al. 2016

This study investigated the colorimetric properties of different veneering materials on core materials. Standardized specimens (10 mm × 10 mm × 1.5 mm) reflecting four core (polyetheretherketone (PEEK), zirconia (ZrO2), cobalt–chromium–molybdenum alloy (CoCrMo), and titanium oxide (TiO2); thickness: 1.5 mm) and veneering materials (VITA Mark II, IPS e.max CAD, LAVA Ultimate and VITA Enamic, all in shade A3; thickness: 0.5, 1.0, 1.5 and 2 mm, respectively) were fabricated. Specimens were superimposed to assemblies, and the color was determined with a spectrophotometer (CieLab-System) or a chair-side color measurement device (VITA EasyShade), respectively. Data were analyzed using three-, two-, and one-way ANOVA, a Chi2-test, and a Wilson approach (p < 0.05). The measurements with EasyShade showed A2 for VITA Mark II, A3.5 for VITA Enamic, B2 for LAVA Ultimate, and B3 for IPS e.max CAD. LabE-values showed significant differences between the tested veneering materials (p < 0.001). CieLab-System and VITA EasyShade parameters of the different assemblies showed a significant impact of core (p < 0.001), veneering material (p < 0.001), and thickness of the veneering material (p < 0.001). PEEK as core material showed comparable outcomes as compared to ZrO2 and CoCrMo, with respect to CieLab-System parameters for each veneering material. The relative frequency of the measured VITA EasyShade parameters regarding PEEK cores also showed comparable results as compared to the gold standard CoCrMo, regardless of the veneering material used.