Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

762 questions · 830 findings · 43 reviews · Orthodontics

No studies found 186 · 22.4%GRADE not reported 410 · 49.4%Very low 122 · 14.7%Low 79 · 9.5%Moderate 30 · 3.6%High 3 · 0.4%

Early treatment (two-phase) with headgear vs Late treatment (one-phase in adolescence) with headgear

PAR score · Children (7 to 11 years) and adolescents (12 to 16 years) with prominent upper front teeth (Class II malocclusion)

Early treatment (two-phase) with headgear showed no clear difference in PAR score compared with late treatment (one-phase in adolescence) with headgear; GRADE not reported.

1 finding from 1 review

Orthodontic treatment without extraction of permanent teeth vs Orthodontic treatment involving extraction of permanent teeth

Cephalometric measurements (ANB change and front teeth inclination changes) · Children (80% aged <= 16 years) with a Class II division 2 malocclusion (deep bite and retroclined upper front teeth)

The review found no eligible studies for this question.

1 finding from 1 review

Late treatment (one-phase) with removable functional appliance vs no treatment

Final ANB · Adolescents (age 12 to 16 years) receiving orthodontic treatment to correct prominent upper front teeth (Class II malocclusion)

Late treatment (one-phase) with removable functional appliance may leads to lower final ANB compared with no treatment (low certainty).

1 finding from 1 review

Late treatment (one-phase) with fixed functional appliance vs no treatment

Final ANB · Adolescents (age 12 to 16 years) receiving orthodontic treatment to correct prominent upper front teeth (Class II malocclusion)

Late treatment (one-phase) with fixed functional appliance showed no clear difference in final ANB compared with no treatment (low certainty).

1 finding from 1 review

Activator functional appliance vs Fixed functional appliance (FORSUS FRD EZ)

Final ANB · Adolescents (age 12 to 16 years) receiving orthodontic treatment to correct prominent upper front teeth (Class II malocclusion)

Activator functional appliance led to lower final ANB compared with fixed functional appliance (FORSUS FRD EZ); GRADE not reported.

1 finding from 1 review

Early treatment (two-phase) with headgear vs Late treatment (one-phase in adolescence) with headgear

Incidence of new incisal trauma · Children (7 to 11 years) and adolescents (12 to 16 years) with prominent upper front teeth (Class II malocclusion)

Early treatment (two-phase) with headgear may leads to lower incidence of new incisal trauma compared with late treatment (one-phase in adolescence) with headgear (low certainty).

1 finding from 1 review

Early treatment (two-phase: phase 1 in childhood, phase 2 in adolescence) with functional appliance vs Late treatment (one-phase in adolescence) with functional appliance

Incidence of new incisal trauma · Children (7 to 11 years) and adolescents (12 to 16 years) with prominent upper front teeth (Class II malocclusion)

Early treatment (two-phase: phase 1 in childhood, phase 2 in… probably leads to lower incidence of new incisal trauma compared with late treatment (one-phase in adolescence) with functional appliance (moderate certainty).

1 finding from 1 review

Removable functional appliance vs Fixed functional appliance

Final ANB · Adolescents (age 12 to 16 years) receiving orthodontic treatment to correct prominent upper front teeth (Class II malocclusion)

Removable functional appliance may leads to lower final ANB compared with fixed functional appliance (low certainty).

1 finding from 1 review

Chemical cured composite vs Light cured composite

Bracket (bond) failure · Patients with fixed orthodontic appliances attached to their teeth
1 finding from 1 review
  • Adhesives for fixed orthodontic brackets 2018 · Cochrane All outcomes
    To end of appliance treatment
    Additional Table 1 summarises the proportion of bracket failures for a CC and LC composite with two different bracket bases (O'Brien 1989). The paper reported the results of applying a Mantel-Haenszel Chi2 test which…
    1 study · 52 participants
    GRADE not reported

Early treatment (two-phase: phase 1 in childhood, phase 2 in adolescence) with functional appliance vs Late treatment (one-phase in adolescence) with functional appliance

Final overjet · Children (7 to 11 years) and adolescents (12 to 16 years) with prominent upper front teeth (Class II malocclusion)

Early treatment (two-phase: phase 1 in childhood, phase 2 in… led to lower final overjet compared with late treatment (one-phase in adolescence) with functional appliance; GRADE not reported.

2 findings from 1 review

Composite (chemical or light cured) vs Resin-modified glass ionomer cement

Outcome not reported · Patients with fixed orthodontic appliances attached to their teeth

The review found no eligible studies for this question.

1 finding from 1 review
  • Adhesives for fixed orthodontic brackets 2018 · Cochrane All outcomes
    To end of appliance treatment
    No included studies involved a comparison with resin-modified glass ionomer cement (a planned adhesive group). The authors recommended future randomised controlled trials involving resin-modified light cured glass…
    0 studies
    No studies found

Harvold Activator vs Frankel function regulator

Occlusion (net change in overjet, short term) · Adolescents (age 12 to 16 years) receiving orthodontic treatment to correct prominent upper front teeth (Class II malocclusion)

Harvold Activator led to lower overjet change compared with frankel function regulator; GRADE not reported.

1 finding from 1 review

Chemical cured composite vs Glass ionomer cement (GIC)

Bracket (bond) failure · Patients with fixed orthodontic appliances attached to their teeth
1 finding from 1 review
  • Adhesives for fixed orthodontic brackets 2018 · Cochrane All outcomes
    To end of appliance treatment
    The one trial article for this adhesive comparison reported the results of paired t-tests comparing different sides of the mouth. No standard deviations were presented, so we were unable to reproduce the data. The…
    1 study · 60 participants
    GRADE not reported

Early treatment (two-phase: phase 1 in childhood, phase 2 in adolescence) with functional appliance vs Late treatment (one-phase in adolescence) with functional appliance

Final ANB · Children (7 to 11 years) and adolescents (12 to 16 years) with prominent upper front teeth (Class II malocclusion)

Early treatment (two-phase: phase 1 in childhood, phase 2 in… led to lower final ANB compared with late treatment (one-phase in adolescence) with functional appliance; GRADE not reported.

2 findings from 1 review

Late treatment (one-phase) with removable functional appliance vs no treatment

Incidence of incisal trauma · Adolescents (age 12 to 16 years) receiving orthodontic treatment to correct prominent upper front teeth (Class II malocclusion)

The review found no eligible studies for this question.

1 finding from 1 review

Removable functional appliance vs Fixed functional appliance

Final overjet · Adolescents (age 12 to 16 years) receiving orthodontic treatment to correct prominent upper front teeth (Class II malocclusion)

Removable functional appliance may leads to higher final overjet compared with fixed functional appliance (low certainty).

1 finding from 1 review

Early treatment (two-phase: phase 1 in childhood, phase 2 in adolescence) with functional appliance vs Late treatment (one-phase in adolescence) with functional appliance

Incidence of incisal trauma · Children (7 to 11 years) and adolescents (12 to 16 years) with prominent upper front teeth (Class II malocclusion)

Early treatment (two-phase: phase 1 in childhood, phase 2 in… showed no clear difference in incidence of incisal trauma compared with late treatment (one-phase in adolescence) with functional appliance; GRADE not reported.

1 finding from 1 review