RT Journal Article
T1 Long-term stability of rapid maxillary expansion combined with chincup protraction followed by fixed appliances
A1 Palma Fernández, Juan Carlos
A1 Tejedor-Sanz, Natalia
A1 Oteo Calatayud, María Dolores
A1 Alarcón Pérez, José Antonio
AB Objective: To analyze the long-term stability of rapid maxillary expansion (RME) and protraction from chincup therapy in girls with Class III malocclusion.Materials and methods: Twenty-two girls (mean age = 9.1 ± 0.6 years) with Class III malocclusion were treated with combined RME and protraction from a chincup, followed by fixed appliances. Lateral cephalograms were evaluated before treatment, at the end of a two-phase treatment protocol (mean age = 15.1 ± 1.1 years), and 10.9 ± 0.5 years after the end of treatment (mean age = 27.5 ± 0.5 years). The control group consisted of 22 matched girls with skeletal Class I malocclusion.Results: After treatment, the Class III group showed significant improvement of the Class III malocclusion, mainly due to changes in the mandible (ie, SNB angle decreased 1.8 ± 1.6°) and significant improvement of the sagittal maxillomandibular relationship (Wits appraisal increased 2.6 ± 2.1 mm; ANB angle increased 1.0 ± 0.3 mm). These changes remained stable for an average of 10 years after the end of therapy. No tendency toward relapse was detected, and the mandibular position showed favorable outcomes.Conclusions: RME and protraction from chincup therapy led to successful long-term outcomes in 18 of 22 patients (81.8%). This treatment approach can be considered an efficient therapy in growing girls with mild skeletal Class III malocclusion caused by maxillary retrusion and mandibular protrusion.
PB EH Angle Education and Research Foundation
SN 0003--3219
YR 2014
FD 2014-06-03
LK https://hdl.handle.net/20.500.14352/129471
UL https://hdl.handle.net/20.500.14352/129471
LA eng
NO Palma JC, Tejedor-Sanz N, Oteo MD, Alarcón JA. Long-term stability of rapid maxillary expansion combined with chincup protraction followed by fixed appliances. Angle Orthod. 2015 Mar;85(2):270-7. doi: 10.2319/012514-68.1
DS Docta Complutense
RD 26 feb 2026