Optical properties of currently used zirconia‐based esthetic restorations fabricated with different techniques

• Published in: Journal of esthetic and restorative dentistry 2020-01, Vol.32 (1), p.26-33
• Main Author: Turgut, Sedanur
• Format: Article
• Language: English
• Subjects: Aging; color; Dental veneers; Dentistry; Optical properties; Statistical analysis; veneering; Zirconia
• ISSN: 1496-4155; 1708-8240
• DOI: 10.1111/jerd.12533

Objective The aim was to evaluate the effects of different types of monolithic zirconia (MZ) and fabrication techniques on the optical properties of newly generated zirconia‐based materials after aging. Material and Methods Sixty specimens (n = 10) were prepared. For the groups layering‐veneering (LV), overpressing (OP), porcelain fused to zirconia (PFZ), and cutback (CB), 3Y‐TZP, IPS e.max ZirCAD was prepared as the core material (0.5 ± 0.01 mm). For full‐contour (FC) technique, 3Y‐TZP was used for MZ‐LT (low translucency) and 4Y‐TZP was used for MZ‐MT (medium translucency). L*, a*, b*, chroma (C), and relative translucency (RTP) were measured before (L1*, a1*, b1*, C1, RTP1) and after (L2*, a2*, b2*, C2, RTP2) UV aging. Statistical analyses were performed by one‐way ANOVA with Tukey's test and paired sample t tests (P = .05). Results Fabrication techniques significantly affected the L*, a*, b*, C, RTP, and ΔE00 values (P ˂ .01). The highest L1* value was found in MZ‐LT; followed, in order, by OP, PFZ, LV, CB, and MZ‐MT. The highest b1* and C1 values were found in OP, while MZ‐MT had the lowest values (P ˂ .05). FC had the highest RTP values for MZ‐MT (13 ± 0.9 RTP1; 11.2 ± 0.9 RTP2), and the lowest RTP values were found for MZ‐LT (8.5 ± 0.9 RTP1; 8.3 ± 1.2 RTP2) (P ˂ .01). Aging caused significant differences in the L*, a*, b*, C, and RTP values (P