[Incrustation of marker threads of intrauterine devices in the uterine cavity and cervix uteri].

If the indicating thread of intrauterine contraceptive devices is situated inside the uterine cavity, it is incrustated in the same way with calcium carbonate like the device itself. In 20 per cent the intracervical part of the thread is incrustated, too. The danger of an ascending inflammatory disease is increasing with the precipitation of substances, probably, denaturated fibrine or mucine according to the infrared spectral analysis.