A Comparative Evaluation of the Radiopacity of Contemporary Restorative CAD/CAM Blocks Using Digital Radiography Based on the Impact of Material Composition

Table 1

Detailed description of materials tested in the study.

Material description	Manufacturer	Trade name	Chemical composition
Fully stabilized zirconia (FSZ)	Zirkonzahn, Taufers, Italy	Prettau anterior	<12% Y2O3, <1% Al2O3, max., 0.02% SiO2, max., 0.01% Fe2O3, max. 0.04% Na2O.
Zirconia-containing lithium silicate ceramics (ZLS)	Vita Zahnfabrik, Bad Säckingen, Germany	Vita Suprinity	56–64% SiO2, 15–21% Li2O, 8–12% ZrO2, 1–4% K2O, 3–8% P2O5, 1–4% Al2O3, and pigments (0–6%)
Hybrid ceramics (HC)	Vita Zahnfabrik, Bad Säckingen, Germany	Vita Enamic	Ceramic part: 86% wt. SiO2 (58–63%), Al2O3 (20–23%), Na2O (9–11%), K2O (4–6%), B2O3 (0.5–2%), ZrO2 (<1%), KaO (<1%).SiO2 (58–63%), Al2O3 (20–23%), Na2O (9–11%), K2O (4–6%), B2O3 (0.5–2%), ZrO2 (<1%), KaO (<1%).; Polymer part: 14 % wt (UDMA, TEGDMA)
Resin-based ceramics (RBC)	Shofu Inc., Kyoto, Japan.	Shofu disk HC	Silica powder, zirconium silicate, UDMA, TEGDMA, micro-fumed silica, silica (20 nm), barium glass (300 nm), and pigments.
High-performance polymer (HPP-PEKK)	Cendres + Métaux Italia s.r.l. Milano, Italy	Pekkton® ivory	Polyetherketoneketone (PEKK), titanium dioxide pigments.
High-performance polymer (HPP-PEEK)	Bredent, GmbH and Co.KG. Weissenhorner, Senden, Germany	breCAM.BioHPP	Partially crystalline polyetheretherketone (PEEK), 20% wt, ceramic fillers (0.3–0.5 µm)