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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15 studies involving 1722 patients were included in this Cochrane review update on orthodontic retention. However, there was insufficient high quality evidence to make recommendations on retention procedures.
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