Acessibilidade / Reportar erro

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.

Keywords:
Crossbite; Maxillary expansion; Retainer.

RESUMO

OBJETIVO:

o objetivo da presente revisão sistemática foi avaliar a duração do período de contenção e a estabilidade do tratamento ortodôntico com expansão maxilar em pacientes em crescimento com mordida cruzada posterior.

MÉTODOS:

foram realizadas buscas estratégicas nas bases eletrônicas: Cochrane Library, Web of Science, PubMed e Scopus, até 15 de janeiro de 2016. Os critérios de inclusão foram: estudos clínicos controlados e randomizados, prospectivos ou retrospectivos, de pacientes em crescimento com mordida cruzada; tratados com aparelhos expansores maxilares, com fase de contenção pós-expansão e no mínimo seis meses de fase de pós-contenção. Os critérios de exclusão foram: mordida cruzada anterior, anomalias craniofaciais, cirurgia ou outro tratamento ortodôntico; relato de casos; artigos de opinião; teses; revisões de literatura e revisões sistemáticas. O risco de viés dos artigos selecionados foi avaliado a partir do Cochrane risk of bias tool para ensaios clínicos randomizados e Downs and Black checklist para ensaios clínicos não randomizados.

RESULTADOS:

a busca resultou em 156 títulos/resumos, sendo 44 textos examinados na íntegra. Foram selecionados 6 artigos para o acesso à qualidade metodológica. A duração do período de contenção ocorreu entre 4 semanas e 6 meses. Aparelhos fixos (aparelho em acrílico, Haas, Hyrax e quad-helix) ou removíveis (Hawley e Hawley com expansor) foram utilizados na fase de contenção.

CONCLUSÃO:

parece que seis meses de contenção com aparelhos fixos ou removíveis são suficientes para evitar a recidiva ou garantir mudanças mínimas em um curto período de acompanhamento pós-contenção.

Palavras-chave:
Mordida cruzada; Expansão Maxilar; Contenção.

INTRODUCTION

Posterior crossbite is a common malocclusion in the deciduous and mixed dentitions, with prevalence rates of 7.5%11. Keski-Nisula K, Lehto R, Lusa V, Keski-Nisula L, Varrela J. Occurrence of malocclusion and need of orthodontic treatment in early mixed dentition. Am J Orthod Dentofacial Orthop. 2003 Dec;124(6):631-8. to 22%,22. Tausche E, Luck O, Harzer W. Prevalence of malocclusions in the early mixed dentition and orthodontic treatment need. Eur J Orthod. 2004 June;26(3):237-44. and in the permanent dentition with rates of 10.2% to 14.4%.33. Jonsson T, Arnlaugsson S, Karlsson KO, Ragnarsson B, Arnarson EO, Magnusson TE. Orthodontic treatment experience and prevalence of malocclusion traits in an Icelandic adult population. Am J Orthod Dentofacial Orthop . 2007 Jan;131(1):8.e11-8.

The etiology of this malocclusion may be dental, skeletal and/or functional.44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52. Few studies have reported the self-correction of posterior crossbite in the deciduous dentition, related to the discontinuation of sucking habits and chronic respiratory childhood diseases.55. Egermark-Eriksson I, Carlsson GE, Magnusson T, Thilander B. A longitudinal study on malocclusion in relation to signs and symptoms of cranio-mandibular disorders in children and adolescents. Eur J Orthod. 1990 Nov;12(4):399-407.,66. Thilander B, Wahlund S, Lennartsson B. The effect of early interceptive treatment in children with posterior cross-bite. Eur J Orthod. 1984 Feb;6(1):25-34.However, this condition is usually not self-corrected.44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,77. Petrén S, Bondemark L, Söderfeldt B. A systematic review concerning early orthodontic treatment of unilateral posterior crossbite. Angle Orthod. 2003 Oct;73(5):588-96.,88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.

Studies with adolescents and adults have revealed that patients presenting posterior crossbite have an increased risk to develop craniomandibular disorders, showing more signs and symptoms of these conditions.22. Tausche E, Luck O, Harzer W. Prevalence of malocclusions in the early mixed dentition and orthodontic treatment need. Eur J Orthod. 2004 June;26(3):237-44.,55. Egermark-Eriksson I, Carlsson GE, Magnusson T, Thilander B. A longitudinal study on malocclusion in relation to signs and symptoms of cranio-mandibular disorders in children and adolescents. Eur J Orthod. 1990 Nov;12(4):399-407.Several authors suggest the early treatment of crossbites to prevent mandibular dysfunction as well as craniofacial asymmetry.77. Petrén S, Bondemark L, Söderfeldt B. A systematic review concerning early orthodontic treatment of unilateral posterior crossbite. Angle Orthod. 2003 Oct;73(5):588-96.

8. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.

9. Defraia E, Marinelli A, Baroni G, Tollaro I. Dentoalveolar effects induced by a removable expansion plate. Prog Orthod. 2007;8(2):260-7.
-1010. Flores-Mir C. Grinding is effective in early orthodontic treatment of unilateral posterior crossbite. Evid Based Dent. 2005;6(1):24.

Adults can be submitted to maxillary expansion, although there are controversies regarding the nonsurgical treatment.1111. Handelman CS, Wang L, BeGole EA, Haas AJ. Nonsurgical rapid maxillary expansion in adults: report on 47 cases using the Haas expander. Angle Orthod . 2000 Apr;70(2):129-44.,1212. Lee KJ, Park YC, Park JY, Hwang WS. Miniscrew-assisted nonsurgical palatal expansion before orthognathic surgery for a patient with severe mandibular prognathism. Am J Orthod Dentofacial Orthop . 2010 June;137(6):830-9.

Various methods have been suggested for correction and retention after treatment of posterior crossbite in growing patients: Haas,88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.,1313. Haas AJ. Long-term posttreatment evaluation of rapid palatal expansion. Angle Orthod . 1980 July;50(3):189-217.

14. Huynh T, Kennedy DB, Joondeph DR, Bollen AM. Treatment response and stability of slow maxillary expansion using Haas, hyrax, and quad-helix appliances: a retrospective study. Am J Orthod Dentofacial Orthop . 2009 Sept;136(3):331-9.

15. Wong CA, Sinclair PM, Keim RG, Kennedy DB. Arch dimension changes from successful slow maxillary expansion of unilateral posterior crossbite. Angle Orthod . 2011 July;81(4):616-23
-1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22. Hyrax,1414. Huynh T, Kennedy DB, Joondeph DR, Bollen AM. Treatment response and stability of slow maxillary expansion using Haas, hyrax, and quad-helix appliances: a retrospective study. Am J Orthod Dentofacial Orthop . 2009 Sept;136(3):331-9.,1515. Wong CA, Sinclair PM, Keim RG, Kennedy DB. Arch dimension changes from successful slow maxillary expansion of unilateral posterior crossbite. Angle Orthod . 2011 July;81(4):616-23,1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5.,1818. Wangsrimongkol T, Manosudprasit M, Pisek P, Leelasinjaroen P. Correction of complete maxillary crossbite with severe crowding using Hyrax expansion and fixed appliance. J Med Assoc Thai. 2013 Sept;96 Suppl 4:S149-56. quad-helix appliance (QDH),44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,77. Petrén S, Bondemark L, Söderfeldt B. A systematic review concerning early orthodontic treatment of unilateral posterior crossbite. Angle Orthod. 2003 Oct;73(5):588-96.,1414. Huynh T, Kennedy DB, Joondeph DR, Bollen AM. Treatment response and stability of slow maxillary expansion using Haas, hyrax, and quad-helix appliances: a retrospective study. Am J Orthod Dentofacial Orthop . 2009 Sept;136(3):331-9.,1515. Wong CA, Sinclair PM, Keim RG, Kennedy DB. Arch dimension changes from successful slow maxillary expansion of unilateral posterior crossbite. Angle Orthod . 2011 July;81(4):616-23,1919. Bell RA, Le Compte EJ. The effects of maxillary expansion using a quad-helix appliance during the deciduous and mixed dentitions. Am J Orthod. 1981 Feb;79(2):152-61.

20. Bjerklin K. Follow-up control of patients with unilateral posterior cross-bite treated with expansion plates or the quad-helix appliance. J Orofac Orthop. 2000;61(2):112-24.
-2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81.removable plates,44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,77. Petrén S, Bondemark L, Söderfeldt B. A systematic review concerning early orthodontic treatment of unilateral posterior crossbite. Angle Orthod. 2003 Oct;73(5):588-96.,99. Defraia E, Marinelli A, Baroni G, Tollaro I. Dentoalveolar effects induced by a removable expansion plate. Prog Orthod. 2007;8(2):260-7.,2020. Bjerklin K. Follow-up control of patients with unilateral posterior cross-bite treated with expansion plates or the quad-helix appliance. J Orofac Orthop. 2000;61(2):112-24.

21. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81.
-2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13.grinding77. Petrén S, Bondemark L, Söderfeldt B. A systematic review concerning early orthodontic treatment of unilateral posterior crossbite. Angle Orthod. 2003 Oct;73(5):588-96.,1010. Flores-Mir C. Grinding is effective in early orthodontic treatment of unilateral posterior crossbite. Evid Based Dent. 2005;6(1):24. and edgewise fixed appliances.2323. Gurel HG, Memili B, Erkan M, Sukurica Y. Long-term effects of rapid maxillary expansion followed by fixed appliances. Angle Orthod . 2010 Jan;80(1):5-9.

The successful treatment of a posterior crossbite is frequently reached not only by the expansion of the maxilla. In growing subjects, the treatment must also achieve the reestablishment of the normal growth rate on a longitudinal basis,2424. Kau CH, Zhurov A, Scheer R, Bouwman S, Richmond S. The feasibility of measuring three-dimensional facial morphology in children. Orthod Craniofac Res. 2004 Nov;7(4):198-204. as well as improve the oral and general health.2525. McNamara JA Jr, Lione R, Franchi L, Angelieri F, Cevidanes LH, Darendeliler MA, et al. The role of rapid maxillary expansion in the promotion of oral and general health. Prog Orthod. 2015;16:33.

No consensus among authors exists regarding the optimal retention period after maxillary expansion. Some authors recommend that the retention phase should last for 6 weeks,1919. Bell RA, Le Compte EJ. The effects of maxillary expansion using a quad-helix appliance during the deciduous and mixed dentitions. Am J Orthod. 1981 Feb;79(2):152-61. while others advocate 644. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81.or 8 months.88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302. Thus, a systematic review of the literature was deemed appropriate.

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. The PICOS is shown in Table 1.

MATERIAL AND METHODS

This systematic review was registered on the National Institute of Health Research Database:

www.crd.york.ac.uk/prospero.

The inclusion criteria were randomized controlled trials (RTCs) and controlled trials in human growing subjects; experimental group presenting posterior crossbite; treatment with maxillary expanders; retention phase after expansion; and a minimum 6-month post-retention phase.

The exclusion criteria were subjects presenting anterior crossbite, craniofacial anomalies, previous surgery or another orthodontic intervention; case reports; author’s opinions articles, thesis, literature reviews and systematic reviews.

To identify the studies, detailed search strategies were developed and executed in the following electronic databases: Cochrane Library, Web of Science, PubMed and Scopus (Table 2). All electronic searches were conducted between May 28, 2015 and January 15, 2016. No restrictions for language or publication date were used.

The results were compiled into a reference manager (EndNote X5, Thomson Reuters), and duplicate records were excluded.

Two authors independently reviewed titles and abstracts according to the inclusion and exclusion criteria. Any disagreement was solved by consultation with two others authors until mutual agreement was reached and initial selection was completed.

Full texts of articles where it was not possible to decide for inclusion or exclusion only by reading the title and abstract were also screened to confirm their eligibility. Two authors independently read the full texts of the articles previously selected.

After electronic searches and the initial selection process, a supplementary hand search was implemented by checking the references of each selected study. Afterwards, two authors independently performed a structured quality assessment of the selected articles based on risk of bias. The Cochrane risk of bias tools2626. Higgins JPT, Green S, editors. Cochrane handbook for systematic reviews of interventions. 2009. version 5.1.0, updated March 2011. was used for randomized studies, and the Downs and Black checklist2727. Downs SH, Black N. The feasibility of creating a checklist for the assessment of the methodological quality both of randomised and non-randomised studies of health care interventions. J Epidemiol Community Health. 1998 June;52(6):377-84. for non-randomized studies. Any disagreement on the risk of bias assessment was resolved after consulting other two authors.

The following data from the included articles were extracted and independently compiled by two researchers: author/year; sample description; crossbite type; expander/activation time; activation rate; retainer appliance and retention time; measurements; follow-up time; overcorrection; experimental group versus control group (pvalue); relapse after follow-up time; crossbite correction stability after follow-up; conclusion.

Table 1
PICOS.

Table 2
Search strategy in databases.

In order to verify the percentage of relapse for each transversal measure given by the authors, the difference between the measure immediately after expansion (AE) and the measure after 6-month follow-up (FU) was calculated following the equation: [(AE-FU)x100/AE].

RESULTS

In the databases search, 281 articles were found. After duplicates were excluded, we screened 156 titles and abstracts; and 112 studies were excluded from this review; 44 full texts were screened, and 6 articles were selected according to the eligibility criteria. The search process is shown in the Prisma flow diagram (Fig 1).

Two articles included, which are randomized controlled trials, were assessed with the Cochrane tool and the corresponding graphs are shown in Figures 2 and 3. The non-randomized studies were classified according to their risk of bias, using the Downs and Black checklist, as: low risk,44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52. medium1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22. and high risk88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.,2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13. (Table 3).

Data extracted from the included articles are displayed in Tables 4A and 4B. The retention period after maxillary expansion ranged from five2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13. to sixteen months,1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22. and the appliances used were: fixed (acrylic plate expander,2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13. Haas,88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.,1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22. Hyrax1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5. and quad-helix44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81.) or removable (hawley44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13. and Hawley expander44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81.,2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13.).

The follow-up of these patients ranged from 6 months4 to 6016 months, and the relapses of the measurements described reached 0%4 to 27%1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5..

Figure 1
Prisma flow diagram.

Figure 2
Risk of bias graph for RCTs studies.

Figure 3
Risk of bias summary for RCTs studies.

Table 3
Downs and Black checklist for non-randomized studies.
Table 4A
Characteristics and data of included studies.
Table 4B
Characteristics and data of included studies.

DISCUSSION

The duration of the steady retention after maxillary expansion that guarantees the correction of posterior crossbite is not well established in the literature and this was the main reason that led to this systematic review.

The evidence collected in this systematic review combined low, medium and high risk of bias studies. The main drawback in RCTs and non-RCTs was blinding, which is unfeasible in the assessed type of intervention. In non-RCTs, another main problem was the description of the characteristics of subjects lost to follow-up.

However, the heterogeneity among the studies made the comparison difficult. Dental and skeletal measures varied widely, as follows: intermolar distance measured between the center of the fossae of maxillary permanent first molars,44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.,1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22. measured between the mesiobuccal cusp tips and gingival margin,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. distance between the center of the fossae of maxillary primary second molars,88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302. intercanine distance measured between cusp tips,44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. gingival margin,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. palatal surface area,2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13. and distance of center of pulp chamber in molars and tip of premolar buccal pulp horn, mesial buccal root apex of molars, buccal root apex of premolars, outer cortex of alveolar bone at the vertical level of the root apex.1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5.

The appliances used for maxillary expansion in the studies included were Haas,88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.,1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22. Hyrax,1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5. QDH,44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. removable acrylic expansion plate,44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. and cemented acrylic plate.2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13. All authors used the same expander appliance for retention of the maxillary expansion,44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.,1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22.,1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5.,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81.,2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13. except the quad-helix group in the study from Godoy et al,44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52. who used a removable Hawley retainer for retention.

The control group also differed among the studies. In some studies, subjects presenting posterior crossbite were included in the control group,44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.,1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22.,1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5. while other authors selected only patients with no posterior crossbite (normal occlusion or a different malocclusion with no transverse discrepancies) for the control group.2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81.,2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13. When these studies featured more than one control group, it was taken into account only the group of subjects with similar occlusion.1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5.

Four studies44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.,1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22.,1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5. where the control group comprised subjects with posterior crossbite were approved by ethics committees and the authors followed their guidelines. Lagravere et al1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5. benefited from a treatment control group with delay of 12 months, and there were no negative consequences for the treatment of patients. However, that may be an ethical issue, since delaying the correction of a problem, which is known to be better solved as early as possible may be considered unethical. This was the reason why Petrén et al2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. did not include a control group of crossbite untreated subjects as their follow-up reached three years after treatment.

Overcorrection of the posterior crossbite is recommended by some authors44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,1919. Bell RA, Le Compte EJ. The effects of maxillary expansion using a quad-helix appliance during the deciduous and mixed dentitions. Am J Orthod. 1981 Feb;79(2):152-61.,2828. Mew J. Relapse following maxillary expansion. A study of twenty-five consecutive cases. Am J Orthod. 1983 Jan;83(1):56-61.,2929. Sandikçioğlu M, Hazar S. Skeletal and dental changes after maxillary expansion in the mixed dentition. Am J Orthod Dentofacial Orthop . 1997 Mar;111(3):321-7.due to the tooth crown buccal inclination, which is usually a consequence of tooth-supported expanders.2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. The physiology of the relapse demonstrate that molars tend to return to their original buccolingual inclination after retention is discontinued, that would not allow relapse of the posterior crossbite if overexpansion was performed.1111. Handelman CS, Wang L, BeGole EA, Haas AJ. Nonsurgical rapid maxillary expansion in adults: report on 47 cases using the Haas expander. Angle Orthod . 2000 Apr;70(2):129-44. Four of the included studies88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.,1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22.,1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5.,2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13.expanded the maxilla until the crossbite was overcorrected in all groups, particularly it was performed only in primary teeth for Cozzani et al88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302. and Mutinelli et al.1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22. In two articles44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81.however, no overexpansion was produced.

Petrén et al2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. claims that overcorrection might be unnecessary, since their results without overexpansion were found to be stable in a long-term, the rate of relapse was 1.6% in the intermolar cusp distance, even so to avoid buccal tipping of the molars, the appliance was adjusted for buccal root torque.

Authors that used Haas as retainers for at least 7 months1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22. and 8 months88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302. presented a relapse of 1.0% and 0.9% respectively, in the intermolar distance. These results may suggest that a longer time of retention after maxillary expansion - that is, more than 7 months - would favor stability and less relapse. Moreover, the difference of the mean relapse was only 0.1 mm, which may be clinically irrelevant.

Lagravere et al1717. Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5. who used Hyrax as a retainer, observed the highest relapse of measurements, 27% in the molar distance, probably related to patient age, since their sample of the treated group was 14 years. All others authors44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,88. Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.,1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22.,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81.,2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13.presented younger samples, between 5.1 a 9.7 years old, in the mixed dentition.

When removable appliances were used as retainers for 6 months, a relapse of 3.2%44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52. and 1.2%2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. was found in the intermolar distance. Godoy et al4 instructed the patients to use the removable plate 24 hours a day for 3 months and just at night for 3 more months, while Petrén et al2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. recommended a 24-hour/day use for 6 months. That may have influenced on the first authors’ higher rates of relapse.

The overall comparison among fixed and removable retainers when a six-month retention was used, showed a very small range of variation, between 1.2%2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. and 3.2%44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52. in the intermolar distance. When comparing treatment groups which had as their expander/retainer the QDH and EP, Petrén et al2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. observed similar results. According to Godoy et al,44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52. the greatest disadvantage of EP was lost appliances and subsequent laboratory costs, and QDH’s frequent breakage. In spite of this, one of the most cited disadvantages of removable appliances in the literature is the need for patients’ compliance.44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.,3030. Agostino P, Ugolini A, Signori A, Silvestrini-Biavati A, Harrison JE, Riley P. Orthodontic treatment for posterior crossbites. Cochrane Database Syst Rev. 2014 Aug 8;(8):CD000979.

Primozic et al2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13. assessed skeletal measures through the palatal surface area. Considering a 30-month follow-up, there was no relapse in this skeletal measure. On the contrary, there was an increment of 6.38%.They found that increase in the experimental group to be similar to or greater than the increase observed in the control group of normal occlusion. According to the authors, that indicates the reestablishment of a normal growth rate and the condition for normal occlusion and craniofacial development.

However, relapse in dental and skeletal measures does not necessarily represent a relapse in the posterior crossbite. Four authors have reported recurrence of posterior crossbite. That relapse is expressed in percentage of patients as reported by authors or calculated according to their data: 0%1616. Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22.,2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. (Haas group for at least 7 months; removable plate group, 6 months of retention), 5%2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81. (QDH group, 6 months of retention), 9.1%44. Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52. (QDH and removable plate, 6 months of retention), 26.7%2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13. (acrylic cemented plate group, cemented as retention for 1 month and removable for 4 months). Relapse is not a rare event after correction of posterior crossbite.2121. Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81.,2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13.,3030. Agostino P, Ugolini A, Signori A, Silvestrini-Biavati A, Harrison JE, Riley P. Orthodontic treatment for posterior crossbites. Cochrane Database Syst Rev. 2014 Aug 8;(8):CD000979.

Primozic et al2222. Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13. showed the biggest recurrence of posterior crossbite after the treatment, amounting of 8 participants, they suggest that part of this relapse could be explained because the subjects expressed a Class III growth trend, inverse overjet and facial asymmetries.

Limitations of this review are: not enough RCTs were found that were able to answer our question; additionally, no study specifically aimed at answering this question, nor did any study assessed or compared different periods of retention in patients wearing the same kind of appliance. Our systematic review clearly shows the need for randomized controlled trials that specifically assess different periods of retention with the same appliances and the stability of correction of the posterior crossbite, so that a protocol may be created for successful treatment maintenance.

The clinical implication of this systematic review is that six months of retention of crossbite correction used 24 hours a day should be able to maintain the results obtained. However, the evidence for this conclusion is moderate.

CONCLUSION

Based on the results from this systematic review, there is moderate evidence to assert that 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.

REFERENCES

  • 1
    Keski-Nisula K, Lehto R, Lusa V, Keski-Nisula L, Varrela J. Occurrence of malocclusion and need of orthodontic treatment in early mixed dentition. Am J Orthod Dentofacial Orthop. 2003 Dec;124(6):631-8.
  • 2
    Tausche E, Luck O, Harzer W. Prevalence of malocclusions in the early mixed dentition and orthodontic treatment need. Eur J Orthod. 2004 June;26(3):237-44.
  • 3
    Jonsson T, Arnlaugsson S, Karlsson KO, Ragnarsson B, Arnarson EO, Magnusson TE. Orthodontic treatment experience and prevalence of malocclusion traits in an Icelandic adult population. Am J Orthod Dentofacial Orthop . 2007 Jan;131(1):8.e11-8.
  • 4
    Godoy F, Godoy-Bezerra J, Rosenblatt A. Treatment of posterior crossbite comparing 2 appliances: a community-based trial. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e45-52.
  • 5
    Egermark-Eriksson I, Carlsson GE, Magnusson T, Thilander B. A longitudinal study on malocclusion in relation to signs and symptoms of cranio-mandibular disorders in children and adolescents. Eur J Orthod. 1990 Nov;12(4):399-407.
  • 6
    Thilander B, Wahlund S, Lennartsson B. The effect of early interceptive treatment in children with posterior cross-bite. Eur J Orthod. 1984 Feb;6(1):25-34.
  • 7
    Petrén S, Bondemark L, Söderfeldt B. A systematic review concerning early orthodontic treatment of unilateral posterior crossbite. Angle Orthod. 2003 Oct;73(5):588-96.
  • 8
    Cozzani M, Guiducci A, Mirenghi S, Mutinelli S, Siciliani G. Arch width changes with a rapid maxillary expansion appliance anchored to the primary teeth. Angle Orthod . 2007 Mar;77(2):296-302.
  • 9
    Defraia E, Marinelli A, Baroni G, Tollaro I. Dentoalveolar effects induced by a removable expansion plate. Prog Orthod. 2007;8(2):260-7.
  • 10
    Flores-Mir C. Grinding is effective in early orthodontic treatment of unilateral posterior crossbite. Evid Based Dent. 2005;6(1):24.
  • 11
    Handelman CS, Wang L, BeGole EA, Haas AJ. Nonsurgical rapid maxillary expansion in adults: report on 47 cases using the Haas expander. Angle Orthod . 2000 Apr;70(2):129-44.
  • 12
    Lee KJ, Park YC, Park JY, Hwang WS. Miniscrew-assisted nonsurgical palatal expansion before orthognathic surgery for a patient with severe mandibular prognathism. Am J Orthod Dentofacial Orthop . 2010 June;137(6):830-9.
  • 13
    Haas AJ. Long-term posttreatment evaluation of rapid palatal expansion. Angle Orthod . 1980 July;50(3):189-217.
  • 14
    Huynh T, Kennedy DB, Joondeph DR, Bollen AM. Treatment response and stability of slow maxillary expansion using Haas, hyrax, and quad-helix appliances: a retrospective study. Am J Orthod Dentofacial Orthop . 2009 Sept;136(3):331-9.
  • 15
    Wong CA, Sinclair PM, Keim RG, Kennedy DB. Arch dimension changes from successful slow maxillary expansion of unilateral posterior crossbite. Angle Orthod . 2011 July;81(4):616-23
  • 16
    Mutinelli S, Cozzani M. Rapid maxillary expansion in early-mixed dentition: effectiveness of increasing arch dimension with anchorage on deciduous teeth. Eur J Paediatr Dent. 2015 June;16(2):115-22.
  • 17
    Lagravère MO, Carey J, Heo G, Toogood RW, Major PW. Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: a randomized clinical trial. Am J Orthod Dentofacial Orthop . 2010 Mar;137(3):304.e1-12; discussion 304-5.
  • 18
    Wangsrimongkol T, Manosudprasit M, Pisek P, Leelasinjaroen P. Correction of complete maxillary crossbite with severe crowding using Hyrax expansion and fixed appliance. J Med Assoc Thai. 2013 Sept;96 Suppl 4:S149-56.
  • 19
    Bell RA, Le Compte EJ. The effects of maxillary expansion using a quad-helix appliance during the deciduous and mixed dentitions. Am J Orthod. 1981 Feb;79(2):152-61.
  • 20
    Bjerklin K. Follow-up control of patients with unilateral posterior cross-bite treated with expansion plates or the quad-helix appliance. J Orofac Orthop. 2000;61(2):112-24.
  • 21
    Petrén S, Bjerklin K, Bondemark L. Stability of unilateral posterior crossbite correction in the mixed dentition: a randomized clinical trial with a 3-year follow-up. Am J Orthod Dentofacial Orthop . 2011 Jan;139(1):e73-81.
  • 22
    Primožič J, Richmond S, Kau CH, Zhurov A, Ovsenik M. Three-dimensional evaluation of early crossbite correction: a longitudinal study. Eur J Orthod. 2013 Feb;35(1):7-13.
  • 23
    Gurel HG, Memili B, Erkan M, Sukurica Y. Long-term effects of rapid maxillary expansion followed by fixed appliances. Angle Orthod . 2010 Jan;80(1):5-9.
  • 24
    Kau CH, Zhurov A, Scheer R, Bouwman S, Richmond S. The feasibility of measuring three-dimensional facial morphology in children. Orthod Craniofac Res. 2004 Nov;7(4):198-204.
  • 25
    McNamara JA Jr, Lione R, Franchi L, Angelieri F, Cevidanes LH, Darendeliler MA, et al. The role of rapid maxillary expansion in the promotion of oral and general health. Prog Orthod. 2015;16:33.
  • 26
    Higgins JPT, Green S, editors. Cochrane handbook for systematic reviews of interventions. 2009. version 5.1.0, updated March 2011.
  • 27
    Downs SH, Black N. The feasibility of creating a checklist for the assessment of the methodological quality both of randomised and non-randomised studies of health care interventions. J Epidemiol Community Health. 1998 June;52(6):377-84.
  • 28
    Mew J. Relapse following maxillary expansion. A study of twenty-five consecutive cases. Am J Orthod. 1983 Jan;83(1):56-61.
  • 29
    Sandikçioğlu M, Hazar S. Skeletal and dental changes after maxillary expansion in the mixed dentition. Am J Orthod Dentofacial Orthop . 1997 Mar;111(3):321-7.
  • 30
    Agostino P, Ugolini A, Signori A, Silvestrini-Biavati A, Harrison JE, Riley P. Orthodontic treatment for posterior crossbites. Cochrane Database Syst Rev. 2014 Aug 8;(8):CD000979.

Publication Dates

  • Publication in this collection
    Mar-Apr 2017

History

  • Received
    29 Jan 2016
  • Accepted
    12 Sept 2016
Dental Press International Av. Luís Teixeira Mendes, 2712 , 87015-001 - Maringá - PR, Tel: (55 44) 3033-9818 - Maringá - PR - Brazil
E-mail: artigos@dentalpress.com.br