Orthodontic retainers: Effects on periodontal health

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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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Overdentures: The effect of attachment systems on clinical performance

Overdenture - ball attachments

This review of the behaviour of overdentures supported by bar and clip or ball and O-ring attachments included 17 studies. The findings suggest no differences between the two sustems.

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Orthodontic retainers: Bond lower retainers to all anterior teeth or only canines?

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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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Dental adhesive systems: HEMA-free or HEMA-containing systems?

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22 RCTs were included in this review of the influence of the monomer HEMA in the formulation of dental adhesive systems suggests that HEMA-free adhesive systems do not have better clinical performance of the non-carious cervical lesion restorations than HEMA-containing systems.

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Dentures: techniques and materials for final impressions

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9 RCTs were included in this Cochrane review of different final-impression techniques and materials for complete and removable partial dentures. The available evidence for the relative benefits of different denture fabrication techniques and final-impression materials is limited and is of low or very low quality.

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Fissure sealing using flowable composite

Fissure sealant

This review of fissure sealing using flowable composite included 11 studies and suggests retention rates at 1 year may be slightly better than resin-based sealants. However, the findings should be interpreted cautious as the confidence intervals are wide and quality of the studies is limited.

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Orthodontic space closure – en masse or two-step retraction

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8 small studies were included in this review comparing en masse retraction and two-step retraction for orthodontic space closure. While both were effective the en masse/miniscrew combination demonstrated a small statistically significant benefit in terms of incisor retraction and anchorage preservation.

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Computer-engineered complete dentures

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This review of clinical complications associated with computer-engineered complete dentures only identified 5 small studies involving a total of 82 patients providing very limited evidence.

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Orthodontic retainers: impact on periodontal health

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While 24 studies were included in this review of the impact of orthodontic retainers on periodontal health there was a lack of high quality evidence to support any particular retainer on this or a range of other parameters. More well-designed and long terms studies are required.

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