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Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps. It is also used in the flint (actually ferrocerium) of lighters.
Zirconium also called Zirconia (Cercon) is rapidly becoming the material of choice for dental crowns. It is a very strong material able to withstand the wear and tear of every day use. Aesthetically, it is translucent very similar to a natural tooth, reflecting light in much the same way.irconium or Zirconia crowns do not corrode and the normal black gum line that you might see around a porcelain fused metal crown, will not occur, because of the strong ceramic material which is used.