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Damstra considered that a rapid maxillary arch expansion in orthodontic treatment led to change in transversal size of the medioproximal end of the palatal rugae but it did not influence the anterioposterior size.
Use of arch expansion mechanics in patients with increased SN-MP angle should be at all avoided or used with maximum caution.
The principal advantage of the Twin block was to allow incisor and molar correction and upper arch expansion.