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Long-term stability of rapid maxillary expansion combined with chincup protraction followed by fixed appliances.
Angle Orthod. 2015 Mar; 85(2):270-7.AO

Abstract

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.

Authors+Show Affiliations

a Adjunct Professor, Department of Orthodontics, Faculty of Odontology, University Complutense, Madrid, Spain.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

24892796

Citation

Palma, Juan Carlos, et al. "Long-term Stability of Rapid Maxillary Expansion Combined With Chincup Protraction Followed By Fixed Appliances." The Angle Orthodontist, vol. 85, no. 2, 2015, pp. 270-7.
Palma JC, Tejedor-Sanz N, Oteo MD, et al. Long-term stability of rapid maxillary expansion combined with chincup protraction followed by fixed appliances. Angle Orthod. 2015;85(2):270-7.
Palma, J. C., Tejedor-Sanz, N., Oteo, M. D., & Alarcón, J. A. (2015). Long-term stability of rapid maxillary expansion combined with chincup protraction followed by fixed appliances. The Angle Orthodontist, 85(2), 270-7. https://doi.org/10.2319/012514-68.1
Palma JC, et al. Long-term Stability of Rapid Maxillary Expansion Combined With Chincup Protraction Followed By Fixed Appliances. Angle Orthod. 2015;85(2):270-7. PubMed PMID: 24892796.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Long-term stability of rapid maxillary expansion combined with chincup protraction followed by fixed appliances. AU - Palma,Juan Carlos, AU - Tejedor-Sanz,Natalia, AU - Oteo,M Dolores, AU - Alarcón,José Antonio, Y1 - 2014/06/03/ PY - 2014/6/4/entrez PY - 2014/6/4/pubmed PY - 2016/6/10/medline KW - Chincup KW - Class III KW - Long-term KW - Maxillary protraction KW - Stability SP - 270 EP - 7 JF - The Angle orthodontist JO - Angle Orthod VL - 85 IS - 2 N2 - 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. SN - 1945-7103 UR - https://www.unboundmedicine.com/medline/citation/24892796/Long_term_stability_of_rapid_maxillary_expansion_combined_with_chincup_protraction_followed_by_fixed_appliances_ L2 - https://meridian.allenpress.com/angle-orthodontist/article-lookup/doi/10.2319/012514-68.1 DB - PRIME DP - Unbound Medicine ER -