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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This zirconia-based all-ceramic crown replaces a metal crown. Also known as artificial diamond, Zirconia is made of the highest-strength fine ceramic called zirconium oxide (ZrO2).Because of its strength, it is widely used from the space industry to medical technology.he left photograph is a porcelain-fused-to-metal crown, and the right photograph shows a zirconia all-ceramic crown, Lava frame. When lighting from the back of the teeth, the Lava frame lets the light transmitted as the natural tooth, but the underlying metal prevents the light from getting through the crown.