Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,127 questions · 1,590 findings · 132 reviews · Oral Health

No studies found 189 · 11.9%GRADE not reported 1,166 · 73.3%Very low 130 · 8.2%Low 69 · 4.3%Moderate 25 · 1.6%High 11 · 0.7%

Hawley removable retainer vs Clear plastic removable retainer

Stability: Little's Irregularity Index (lower arch) · People who had received fixed appliance orthodontic treatment

It is very uncertain whether hawley removable retainer changes stability: Little's Irregularity Index (lower arch) compared with clear plastic removable retainer (very low certainty).

1 finding from 1 review

Fibre-reinforced composite fixed (bonded) retainer vs Multistrand / spiral wire fixed (bonded) retainer

Adverse effects on oral health: bleeding on probing (lower arch) · People who had received fixed appliance orthodontic treatment

The review found no eligible studies for this question.

1 finding from 1 review

Hawley removable retainer vs Clear plastic removable retainer

Survival of retainers (failure/how many failed) · People who had received fixed appliance orthodontic treatment

It is very uncertain whether hawley removable retainer changes survival of retainers (failure, upper and lower arches) compared with clear plastic removable retainer (very low certainty).

1 finding from 1 review

Hawley removable retainer vs Clear plastic removable retainer

Patient satisfaction: comfort (VAS, upper and lower arches) · People who had received fixed appliance orthodontic treatment

The review found no eligible studies for this question.

1 finding from 1 review

Early childhood caries / severe early childhood caries vs Caries-free controls

Stunting · Children aged ≤6 years (early childhood)

One Nepalese cross-sectional study found caries severity significantly correlated with chronic malnutrition/stunting (HAZ; p<0.0001), especially in rural children; ungraded, no effect size reported.

3 findings from 1 review

CAD/CAM nitinol fixed (bonded) retainer vs Multistrand / spiral wire fixed (bonded) retainer

Adverse effects on oral health: Gingival Index (lower arch) · People who had received fixed appliance orthodontic treatment

CAD/CAM nitinol fixed (bonded) retainer showed no clear difference in adverse effects on oral health: Gingival Index (lower arch) compared with conventional/analogue multistrand fixed (bonded) retainer (low certainty).

1 finding from 1 review

CAD/CAM nitinol fixed (bonded) retainer vs Multistrand / spiral wire fixed (bonded) retainer

Adverse effects on oral health: bleeding on probing (lower arch) · People who had received fixed appliance orthodontic treatment

The review found no eligible studies for this question.

1 finding from 1 review

Part-time clear plastic (removable) retainer vs Any type of fixed (bonded) retainer

Patient satisfaction: discomfort/pain (lower arch) · People who had received fixed appliance orthodontic treatment

It is very uncertain whether part-time clear plastic (removable) retainer changes patient satisfaction: discomfort/pain (lower arch) compared with any type of fixed (bonded) retainer (very low certainty).

1 finding from 1 review

Fibre-reinforced composite fixed (bonded) retainer vs Multistrand / spiral wire fixed (bonded) retainer

Survival: mean survival time (lower arch, months) · People who had received fixed appliance orthodontic treatment

The review found no eligible studies for this question.

1 finding from 1 review

Fibre-reinforced composite fixed (bonded) retainer vs Multistrand / spiral wire fixed (bonded) retainer

Stability: Little's Irregularity Index (lower arch) · People who had received fixed appliance orthodontic treatment

It is very uncertain whether fibre-reinforced composite fixed (bonded) retainer changes stability: Little's Irregularity Index (lower arch) compared with multistrand / spiral wire fixed (bonded) retainer (very low certainty).

1 finding from 1 review

CAD/CAM nitinol fixed (bonded) retainer vs Multistrand / spiral wire fixed (bonded) retainer

Stability: Little's Irregularity Index (lower arch) · People who had received fixed appliance orthodontic treatment

It is very uncertain whether CAD/CAM nitinol fixed (bonded) retainer changes stability: Little's Irregularity Index (lower arch) compared with conventional/analogue multistrand fixed (bonded) retainer (very low certainty).

1 finding from 1 review

Full-time wear of removable retainer (any type) vs Part-time wear of removable retainer (any type)

Stability: Little's Irregularity Index (lower arch) · People who had received fixed appliance orthodontic treatment

It is very uncertain whether full-time wear of removable retainer (any type) changes stability: Little's Irregularity Index (lower arch) compared with part-time wear of removable retainer (any type) (very low certainty).

1 finding from 1 review

Full-time clear plastic (removable) retainer vs Any type of fixed (bonded) retainer

Adverse effects on oral health: gingival bleeding (lower arch) · People who had received fixed appliance orthodontic treatment

It is very uncertain whether full-time clear plastic (removable) retainer changes adverse effects on oral health: gingival bleeding (lower arch) compared with any type of fixed (bonded) retainer (very low certainty).

1 finding from 1 review

Full-time clear plastic (removable) retainer vs Any type of fixed (bonded) retainer

Stability: Little's Irregularity Index (lower arch) · People who had received fixed appliance orthodontic treatment

It is very uncertain whether full-time clear plastic (removable) retainer changes stability: Little's Irregularity Index (lower arch) compared with any type of fixed (bonded) retainer (very low certainty).

1 finding from 1 review

Fibre-reinforced composite fixed (bonded) retainer vs Multistrand / spiral wire fixed (bonded) retainer

Adverse effects on oral health: Gingival Index (lower arch) · People who had received fixed appliance orthodontic treatment

The review found no eligible studies for this question.

1 finding from 1 review

Full-time clear plastic (removable) retainer vs Any type of fixed (bonded) retainer

Adverse effects on oral health: caries (lower arch) · People who had received fixed appliance orthodontic treatment

It is very uncertain whether full-time clear plastic (removable) retainer changes adverse effects on oral health: caries (lower arch) compared with any type of fixed (bonded) retainer (very low certainty).

1 finding from 1 review

CBT vs alternative treatment

Mental distress · People aged 12 years and over with painful TMD lasting 3 months or longer

Cognitive behavioural therapy (CBT) may leads to lower psychological distress at follow-up compared with alternative (active) treatment (e.g. oral splint, medication,… (low certainty).

1 finding from 1 review

CBT vs inactive control (usual care care, attention control, waitlist)

Reduction in pain intensity · People aged 12 years and over with painful TMD lasting 3 months or longer

Cognitive behavioural therapy (CBT) may leads to lower pain intensity at follow-up (12 months) compared with usual care, waiting list or no treatment (control) (low certainty).

1 finding from 1 review

CBT vs alternative treatment

Disability caused by pain at follow-up · People aged 12 years and over with painful TMD lasting 3 months or longer

Cognitive behavioural therapy (CBT) showed no clear difference in disability caused by pain at follow-up compared with alternative (active) treatment (e.g. oral splint, medication,… (low certainty).

1 finding from 1 review