Aim: To compare the data obtained by doing a rapid maxillary expansion (RME) anchored to deciduous vs. permanent teeth. Material and methods: 35 consecutive patients with a maxillary transverse deficiency problem were recruited from the polyclinic dental specialty of the University Alfonso X El Sabio (Madrid) and Morandeira Orthodontics Center (Burgos). The sample was randomly selected in two groups: (i) group RME anchorage to permanent teeth (12 subjects), and (ii) group RME anchorage to temporary teeth (23 subjects). We measured and compared the variables as indicated in table 1. Results: We observed a significant increase (p < 0.001) in upper permanent intermolar distance in the RME anchorage to permanent teeth group vs. the RME anchorage to temporary teeth group. In addition we observed a significantly (p < 0.01) greater increase at the anterior arch length in the RME anchorage to temporary teeth group. Conclusions: RME permanent anchorage group showed an increase of the upper permanent molar width compared with the RME temporary group. Anterior arch length increased significantly in the RME temporary anchorage group.
(Rev Esp Ortod. 2017;47(2):079-089)