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SINGAPORE MEDICAL JOURNAL. 1989 Aug; 30(4):390-2.In the 1980s, a study showed an association between IUD use and pelvic inflammatory disease (PID) and subsequent infertility. About the same time, 2 major manufacturers of IUDs stopped making IUDs. These 2 events caused a decline in IUD use worldwide. In Singapore, however, the decline began in the 1960s when the Family Planning Board withdrew the IUD from its 5 year plan. After that, researchers in Singapore 1st conducted randomized prospective trials of most new IUDs. For example in the late 1980s, they began a prospective trial of the MLCu380 with a complicated insertion system. Multicenter trails have demonstrated that at least 5 of the newest copper IUDs have a failure rate of <2/100 woman years and <1/100 for 3 other new copper IUDs. Some manufacturers have increased the area of exposed copper from 200-250mm to 375-380mm to increase efficacy, but a prospective trial in Singapore did not show an increase. A large multicenter trial has shown that the levonorgestrel releasing IUD (LNg20) has a very low failure rate (.12/100) and reduces menstrual loss, unlike the copper IUDs. Due to legal concerns over the medical grade plastic, however, the manufacturer stopped distributing it in the late 1980s. WHO hoped to identify a manufacturer for the plastic so further trials could begin around 1991. In the late 1980s, WHO studied the silver cored copper wire IUD used to prevent fragmentation. Since IUDs change the endometrium which suppresses intrauterine pregnancies but not extrauterine pregnancies, the risk of an ectopic pregnancy is 10 times that of a nonuser. The risk is lower in copper IUDs suggesting that copper ions reduce the chance of fertilization in the Fallopian tubes. The risk of PID in IUD users ranges from 1.5-2.6. The majority of IUD associated PID occurs within 4 months following insertion and in nulliparous patients with several sexual partners.