Lead in machinable steel alloys up to 0.35% per homogenous material. ... Lead in ceramic components like lead zirconium-titanate (PZT) piezoelectric ... These may typically include wire and cable insulation and gaskets.
Zirconia crowns are made from zirconium dioxide, a very durable type of metal that's related to titanium, although it's categorized as a type of ceramic crown.
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