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 removable arch expander
mandibular arch expander in the transverse (right and left) direction
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removable arch expander
maxillary arch expansion in the anterioposterior directions
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 rapid palatal expander
normally utilized in growing children that has crossbites and narrow upper arch. This expander is fixed in the childs mouth and the have a key at home that they use to activate device to create more space
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Williams expander
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