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It makes a lot of sense when you think about it. Who could appreciate the concept of exact fit more than a dentist? So the dentist designs caps for cervices instead of teeth. What of it? The experimental caps, designed to be worn continuously (unlike other cervical caps), seem to be working well now, although there were problems with materials and design at first.
This unusual saga began about 3 1/2 years ago when Robert A. Goepp, DDS, PhD, encountered his old friend, obstetrician-gynecologist Ewe Freese, MD, at the institution where both were on the faculty—the University of Chicago. In the casual what's-new-in-your-department conversation that ensued, Freese lamented the lack of effective but safe contraceptive methods. Goepp asked why cervical caps could not serve this purpose. Freese said that the older, presized caps have problems, among them the fact that they can easily become dislodged. Goepp responded that the caps
McBride G. Putting a better cap on the cervix. JAMA. 1980;243(16):1617-1618. doi:10.1001/jama.1980.03300420009003