Unlike Phalaenopsis or Vanda, which can constantly make new root growth, Cattleyas only make new roots every now and then. This is usually around the time they make new vegetative growth. Until this happens you need to keep them as hydrated as possible.
If there really are no roots left, it becomes a race between drying out and dying, and finally making some new roots. In the mean time you need to keep the plant in bright shade and in a very humid environment. Watering it won't help at all if there aren't any roots to take up the water.
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