This review assessing the prevalence of failure of both maxillary and mandibular fixed orthodontic bonded retainers (FOBRs) included 34 studies. The findings incicate an overall failure rate of 28.17% (23.19 to 33.15%) based on 31 studies. However the certainty of the evidence was very low to low so the findings should be interpreted cautiously.
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This review comparing the effect of CAD/CAM-based and conventional fixed retainers on the stability of treatment outcomes and periodontal health in patients undergoing orthodontic retention using fixed retainers includeds 7 RCTs. The studies are of moderate size and relatively short duration (6 to 12months) and there are quality concerns so the findings should be viewed cautiously.
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This Cochrane review update evaluating different retention strategies used to stabilise tooth position after orthodontic braces included 47 RCTs. However, only 11 RCTs were at low risk of bias and the overall assessment of the certainty of the evidence is low to very low which means that firm recommendations on orthodontic retention strategies cannot be made.
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In this blog Aljeeta Kadam looks at a review of adjuncts or alternatives to mechanical retention in preserving post orthodontic treatment outcomes. Only 7 studies were included in the review providing very low quality evidence about the use of adjuncts and alternatives.
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This review comparing the effects of vacuum-formed retainers (VFR) and Hawley retainers (HR) on periodontal health included 6 RCTs. While the findings suggests a statistical benefit in favour of HR in the short term the studies are small, short-term and most ( 5) were considered to be at high risk of bias.
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This review of the effects of fixed orthodontic retainers on periodontal health includes 29 manily observational studies. While the findings suggest that fixed rettainers are compatibile with periodontal health the quality of the included studies is very low so the findings should be interpreted cautiously.
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This review evaluating the difference in stability between lower fixed retainers bonded on all six anterior teeth and those bonded only to the canines included 5 studies. Only 2 of the studies were RCTs with finding suggesting better outcomes with bonding to all anterior teeth but the quality of the evidence is low.
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10 trials were included in this review of the effectiveness of Hawley retainer following orthodontic treatment providing low quality evidence that performance was similar to other retainers.
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This review focused on lingual orthodontic retention including 27 studies (9 RCTs; 6 prospective and 12 retrospective studies). However, the quality of evidence was low, providing little evidence for the best treatment protocols.
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The paper reports the finding of a small trial of three type of orthodontic retention 5 years or more post retention and finds no difference. Previously the authors reported their findings after two years of retention again showing no differences.
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