Layered Zeno® Zirconia crowns & bridges provide the esthetics of an all-ceramic with the strength of a PFM. A natural-looking dental restoration that exhibits impressive strength for an affordable price, Layered Zeno® Zirconia has no metal to show through the ceramic and no unsightly black lines at the gingival. In addition, dental lab tests have shown the fracture toughness and flexural strength of zirconia are significantly higher than that of alumina or any other all-ceramic.