Orthodontic treatment for posterior crossbites

摘要: Background A posterior crossbite occurs when the top back teeth bite inside bottom teeth. When it affects one side of mouth, lower jaw may have to move allow meet together. Several treatments been recommended correct this problem. Some widen upper while others are directed at treating cause (e.g. breathing problems or sucking habits). Most used each stage dental development. This is an update a Cochrane review first published in 2001. Objectives To assess effects orthodontic treatment for crossbites. Search methods We searched following electronic databases: Oral Health Group's Trials Register (to 21 January 2014), Central Controlled (CENTRAL) (The Library 2014, Issue 1), MEDLINE via OVID (1946 and EMBASE (1980 2014). We US National Institutes World Organization (WHO) Clinical Registry Platform ongoing trials. placed no restrictions on language date publication searching databases. Selection criteria Randomised controlled trials (RCTs) crossbites children adults. Data collection analysis Two authors, independently duplicate, screened results searches, extracted data assessed risk bias included studies. attempted contact named authors studies missing clarification. ratios (RR) 95% confidence intervals (CIs) summarise dichotomous (event) data, mean differences (MD) with CIs continuous data. performed meta-analyses using fixed-effect models (we would random-effects if we had four more meta-analysis) comparisons outcomes were sufficiently similar. Main results We 15 studies, which two low bias, seven high six unclear. Fixed appliances mid-palatal expansion Nine tested fixed expansion against other. No study reported difference between any type appliance. Fixed versus removable appliances Fixed quad-helix be 20% likely than plates (RR 1.20; CI 1.04 1.37; studies; 96 participants; low-quality evidence). Quad-helix achieve 1.15 mm molar (MD mm; 0.40 1.90; moderate-quality evidence). There was insufficient evidence canine stability correction. Very limited showed that both superior composite onlays terms correction, expansion. Other comparisons Very treatment, but there active treatments. Authors' conclusions There very small body low- suggest appliance successful correcting expanding inter-molar width early mixed dentition (aged eight 10 years). The remaining found quality conclusion intervention better another review.