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Palma Fernández, Juan Carlos Tejedor-Sanz, Natalia Oteo Calatayud, María Dolores Alarcón Pérez, José Antonio 2025-12-19T12:40:12Z 2025-12-19T12:40:12Z 2014-06-03 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 0003--3219 10.2319/012514-68.1 https://hdl.handle.net/20.500.14352/129471 1945-7103 https://doi.org/10.2319/012514-68.1 24892796 httsps://angle-orthodontist.kglmeridian.com/view/journals/angl/85/2/article-p270.xml https://pubmed.ncbi.nlm.nih.gov/24892796/ 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. eng restricted access Long-term stability of rapid maxillary expansion combined with chincup protraction followed by fixed appliances journal article