Objective. Our aim was to investigate the effectiveness of the rapid maxillary expansion (RME) assisted face mask therapy.
Material and methods. Research was carried on 23 patients with the mean age of 11 years 5 months ± 1 year 11 months, who
were treated by RME - face mask therapy for 8 months. Growth predictions for 8 months were performed for each patient and
the data were compared with the treatment results. Results. It was found that the maxilla moved forward while posterior part
exhibited some extrusion. The mandible presented a downward rotation. On the other hand, in the growth predictions mandible
continued to grow in forward direction more, the amount of forward growth of maxilla was not enough to improve the Class III
malocclusion. Contrary, lower incisors proclined, negative overjet increased and patients exhibited more concave profiles in the
latter group. Conclusion. Face mask therapy was found to be effective for the treatment of Class III malocclusion characterized
by maxillary retrognathia.
(Rev Esp Ortod. 2009;39(1):021-032)