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Evidence found and GRADE certainty

779 questions · 866 findings · 43 reviews · Oral and maxillofacial surgery

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No studies found 188 · 21.7%GRADE not reported 548 · 63.3%Very low 81 · 9.4%Low 37 · 4.3%Moderate 8 · 0.9%High 4 · 0.5%

Occlusal splint vs Physical therapy (ultrasound, exercise, sensorimotor training, laser, TENS, manual therapy)

Self-reported joint pain when chewing · People with temporomandibular disorders (TMD)

The review found no eligible studies for this question.

1 finding from 1 review

Mandibular third molar present vs Mandibular third molar absent

Spontaneous space closure · Children and adolescents after extraction of a mandibular permanent first molar (before eruption of the second molar)

In the mandible, presence of the third molar increases odds of spontaneous space closure (OR 2.28; low certainty).

1 finding from 1 review

Extraction of the permanent first molar vs Not applicable (single-group prevalence)

Spontaneous space closure · Children and adolescents after extraction of a mandibular permanent first molar (before eruption of the second molar)

In the maxilla, spontaneous space closure occurred in about 85% of cases (9 studies; prevalence not GRADE-rated).

3 findings from 1 review

Extraction of a maxillary first permanent molar vs Extraction of a mandibular permanent first molar

Spontaneous space closure · Children and adolescents after extraction of a mandibular permanent first molar (before eruption of the second molar)

Spontaneous space closure is much more likely in the maxilla than the mandible (OR 7.77; low certainty).

1 finding from 1 review

Extraction at patient age 11-12 years vs Extraction at patient age 8-10 years

Spontaneous space closure · Children and adolescents after extraction of a mandibular permanent first molar (before eruption of the second molar)

In the mandible, extraction at 11-12 vs 8-10 years showed no significant difference in one analysis (OR 0.82; not GRADE-rated).

2 findings from 1 review

Second molar at Nolla developmental stage 6-7 at extraction vs Second molar at later Nolla stages at extraction

Spontaneous space closure · Children and adolescents after extraction of a mandibular permanent first molar (before eruption of the second molar)

One study found mandibular Nolla stage 6-7 associated with better space closure (OR 55.1; single study; not GRADE-rated).

1 finding from 1 review

Occlusal splint vs No treatment or placebo (non-occlusal or transparent-foil placebo splint)

Patient discomfort · People with temporomandibular disorders (TMD)

The review found no eligible studies for this question.

1 finding from 1 review
  • Occlusal interventions for managing temporomandibular disorders 2024 · Cochrane All outcomes
    Listed in Summary of findings 1 as 'Not reported'; this outcome was not reported by any included study for this comparison. Discomfort was not reported in any included study across the whole review.
    0 studies
    No studies found

Higher mean patient age (per 1 year) vs Lower mean patient age (per 1-year decrement)

Spontaneous space closure · Children and adolescents after extraction of a mandibular permanent first molar (before eruption of the second molar)

In the mandible, mean patient age was not significantly associated with space closure odds (OR 0.59 per year; not GRADE-rated).

1 finding from 1 review

Occlusal splint vs Physical therapy (ultrasound, exercise, sensorimotor training, laser, TENS, manual therapy)

Depression · People with temporomandibular disorders (TMD)

Occlusal splint showed no clear difference in depression compared with physical therapy (ultrasound, exercise, sensorimotor training,…; GRADE not reported.

1 finding from 1 review