Abstract
Objectives To identify and evaluate orthodontic treatments used to expand the maxillary dentition and correct posterior crossbites.
Data sources Medline, Cochrane Library, handsearching of English language orthodontic journals (1970–1997).
Selection criteria All published randomised clinical trials (RCTs) reporting quantitative outcomes data on the crossbite correction, molar and/or canine expansion, signs and symptoms of temporomandibular joint dysfunction or respiratory disease.
Data collection and analysis Odds ratio, 95% confidence intervals (CI), relative risk, relative risk reduction, absolute risk reduction, and the number need to treat were calculated for event data. The weighted mean difference and 95% CI were calculated for continuous data.
Results Five randomised and seven controlled clinical trials met the review criteria and were included. Trials comparing occlusal grinding in the primary dentition with/without an upper removable expansion appliance in the mixed dentition versus no treatment, banded versus bonded rapid maxillary expansion, banded versus bonded slow maxillary expansion, transpalatal arch with/without buccal root torque and an upper removable expansion appliance versus quad-helix were identified.
Conclusions Occlusal grinding in the primary dentition with/without the addition of an upper removable expansion plate was effective in preventing a posterior crossbite in the primary dentition from being perpetuated to the mixed and permanent dentitions. No evidence was found for a difference in treatment effect (molar and canine expansion) in trials comparing banded versus bonded rapid maxillary expansion, banded versus bonded slow maxillary expansion, transpalatal arch with/without buccal root torque, or upper removable expansion appliance versus quad-helix.
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Harrison JE, Ashby D. Orthodontic treatments for posterior crossbites (Cochrane Review). In: The Cochrane Library, Issue 1, 1999. Oxford: Update Software
Full text in The Cochrane Library, UK Cochrane Centre, Summertown Pavillion, Middle Way, Oxford OX2 7LG, UK.
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Johnston, L. Occlusal grinding in the primary dentition effective in preventing a posterior crossbite. Evid Based Dent 2, 19 (2000). https://doi.org/10.1038/sj.ebd.6400020
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DOI: https://doi.org/10.1038/sj.ebd.6400020