Retention period after treatment of posterior crossbite with maxillary expansion: a systematic review

Abstract

OBJECTIVE: The aim of this systematic review was to evaluate the duration of the retention period in growing patients undergoing maxillary expansion and its relation with posterior crossbite stability. METHODS: Search strategies were executed for electronic databases Cochrane Library, Web of Science, PubMed and Scopus, which were completed on January 15, 2016. The inclusion criteria included randomized, prospective or retrospective controlled trials in growing subjects with posterior crossbite; treated with maxillary expanders; retention phase after expansion; post-retention phase of at least 6 months. The exclusion criteria were anterior crossbite, craniofacial anomalies, surgery or another orthodontic intervention; case reports; author’s opinions articles, thesis, literature reviews and systematic reviews. The risk of bias of selected articles was assessed with Cochrane risk of bias tool for RCTs and Downs and Black checklist for non-RCTs.RESULTS: A total of 156 titles/abstracts was retrieved, 44 full-texts were examined, and 6 articles were selected and assessed for their methodological quality. The retention period after maxillary expansion ranged between 4 weeks and 16 months. Fixed (acrylic plate, Haas, Hyrax and quad-helix) or removable (Hawley and Hawley expander) appliances were used for retention.CONCLUSIONS: Six months of retention with either fixed or removable appliances seem to be enough to avoid relapse or to guarantee minimal changes in a short-term follow-up.

Pyk2 deficiency enhances bone mass during midpalatal suture expansion

“…3 To minimize the potential for relapse, a long retention period of 3-6 months is recommended to allow sufficient time for the restoration of bone mineral density (BMD) within the expanded suture. 4,5 To shorten the retention period and obtain ideal RME treatment effects in patients with constricted maxillary arches, additional strategies are required to increase bone formation in the suture. 1,2,4,5 Bone formation is known to be more active in the midpalatal suture after application of an expansion force, compared with sutures without any intervention.…”

“…4,5 To shorten the retention period and obtain ideal RME treatment effects in patients with constricted maxillary arches, additional strategies are required to increase bone formation in the suture. 1,2,4,5 Bone formation is known to be more active in the midpalatal suture after application of an expansion force, compared with sutures without any intervention. [6][7][8] Previous reports have shown that bone morphogenic protein 2 (BMP-2) can promote bone formation in the expanded suture and decrease the relapse ratio.…”

Procedimientos Ortodónticos Mecánicos Y No Mecánicos en Recidiva Y Retención: Revisión De Cobertura Temática

“…However, this was done by retrieving evidence through systematic reviews. 5,6 Few documents analyze the use and importance of produced information and the relationships among research projects on this topic.…”

Der posteriore Kreuzbiss – wann sollte man ihn behandeln und welche Konsequenzen können bei Nichtbehandlung auftreten?

“…Bei zahngetragenen Geräten wird in der Literatur oft eine geringfügige Überexpansion empfohlen. Die Kronen der Oberkiefer-zähne werden während der Erweiterung etwas nach bukkal gekippt und richten sich nach Erweiterung wieder auf [7,8].…”

“…Damit ist man im ersten halben Jahr unabhängig von der Patientenmitarbeit. Die häufigsten Rezidivraten sieht man bei Compliance-abhängigen, herausnehmbaren Retentionsgeräten [7] (▶Abb. 1-4).…”