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What is the contraceptive mechanism of the IUD?

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The IUD (intrauterine device) is a piece of plastic coated with copper that is inserted within the uterus by a doctor.

Copper is then gradually released (IUD may last 5 to 10 years) and since it has a spermicidal action sperm cells are destroyed before fecundation. Besides this mechanism the movement of the IUD inside the uterus causes slight endometrial inflammation that helps to prevent nidation. 

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