Ovulatory dysfunction is the most common cause of AUB in adolescents. As noted (see Pathophysiology), cycles are not consistently ovulatory for the first few years after menarche, especially if menarche occurs at a later age.
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Zirconium dioxide (ZrO. 2), sometimes known as zirconia (not to be confused with zircon), is a white crystalline oxide of zirconium. Its most naturally occurring form, with a monoclinic crystalline structure, is the mineral baddeleyite. A dopant stabilized cubic structured zirconia, cubic zirconia, is synthesized in various colours for use as a gemstone and a diamond simulant. 1 Production, chemical properties, occurrence.