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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Orthodontic retention – little high quality evidence to recommend any one approach to over another

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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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