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Methods: The sample consisted of 21 patients (15 females, 6 males; mean patient age 26 years 5 months). Measurements on maxillary study casts and postero-anterior cephalograms were obtained before surgery, at the end of palatal expansion and ten weeks later. No orthodontic treatment was initiated during the examination period. Results: At T1 significant width expansions were noted in the canine (35,5%), premolar (26,3%) and molar (17,8%) regions.