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Cephalometric radiographs and dental study casts were analyzed in a group of 23 seven-year-old cleft lip and palate patients, 16 with unilateral and 7 with bilateral cleft. The patients' primary surgical procedures had been completed except for closure of the cleft in the hard palate. For comparison, similar records from another group of patients, 18 with unilateral and 8 with bilateral cleft lip and palate, were studied. In these cases the cleft of the hard palate had been repaired in infancy, using a vomer flap procedure. The results indicated that midfacial growth and dental occlusion of the unilateral cleft sample was significantly better in patients whose closure of the hard palatal cleft had been delayed to the stage of mixed dentition than where repair had been performed with a vomer flap in infancy. No differences were found, however, between similar subgroups with bilateral cleft lip and palate.

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