Palma Fernández, Juan CarlosTejedor-Sanz, NataliaOteo Calatayud, María DoloresAlarcón Pérez, José Antonio2025-12-192025-12-192014-06-03Palma 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: 10.2319/012514-68.10003--321910.2319/012514-68.1https://hdl.handle.net/20.500.14352/129471Objective: 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.engjournal article1945-7103https://doi.org/10.2319/012514-68.124892796httsps://angle-orthodontist.kglmeridian.com/view/journals/angl/85/2/article-p270.xmlhttps://pubmed.ncbi.nlm.nih.gov/24892796/restricted access[ 616.314.2-089.23]-055.25ChincupClass IIILong-termMaxillary protractionStabilityOdontología (Odontología)Odontología infantilOclusión dentalOrtodonciaAparatos y material odontológicos3201 Ciencias Clínicas2410.04 Desarrollo Humano3213.13 Ortodoncia-Estomatología3311.03 Instrumentos Para Odontología