The goal of this clinical trial si to compare two removable devices used to treat the transversal discrepancies in growing patients. The main questions it aims to answer are: * the efficacy of the two devices in the palatal expansion * the neuromuscolar effects developed on the stomatognatic system Participants will be instructed in the use and maintenance of the devices and will be checked every 15-30 days for one year.
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Palatal first premolars width
Timeframe: 12 months