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The present study represents a clinical trial in which a new synthetic hygroscopic tent, Dilapan\u00ae, has been evaluated. Dilapan tents of different diameters with different durations of cervical exposure were tested on a case material of 450 nulliparous women. It was found that treatment with 4 mm tents during 3\u20134 h or 3 mm tents during 16\u201320 h produced a cervical dilatation that allowed an easy evacuation of the uterus with a minimum of complications. 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