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Evidence found and GRADE certainty

439 questions · 686 findings · 68 reviews

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No studies found 4 · 0.6%GRADE not reported 617 · 89.9%Very low 26 · 3.8%Low 20 · 2.9%Moderate 11 · 1.6%High 8 · 1.2%

Medium income vs High income

Prevalence of fair/poor self-rated oral health · Adults aged 25 years and older in Australia, Canada, New Zealand, and the United States

In Canada, medium versus high income differed by 8.3 percentage points in prevalence of fair/poor self-rated oral health.

4 findings from 1 review
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Medium income vs High income

Prevalence of untreated decay (% DT > 0) · Adults aged 25 years and older in Australia, Canada, New Zealand, and the United States

In Australia, medium versus high income differed by 6.8 percentage points in prevalence of untreated decay.

4 findings from 1 review
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Low income vs High income

Mean number of decayed teeth (mean DT) · Adults aged 25 years and older in Australia, Canada, New Zealand, and the United States

Across four countries, low versus high income differed by 0.44 decayed teeth in mean number of decayed teeth (random-effects meta-analysis; I2=76.4%).

5 findings from 1 review
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Secondary education vs University education

Mean number of decayed teeth (mean DT) · Adults aged 25 years and older in Australia, Canada, New Zealand, and the United States

In Canada, secondary versus university education differed by 0.7 decayed teeth in mean number of decayed teeth.

4 findings from 1 review
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Post-secondary education vs University education

Prevalence of untreated decay (% DT > 0) · Adults aged 25 years and older in Australia, Canada, New Zealand, and the United States

In Canada, post-secondary versus university education differed by 7.8 percentage points in prevalence of untreated decay.

4 findings from 1 review
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Extraction of a maxillary first permanent molar vs Extraction of a mandibular first permanent molar

Spontaneous space closure · Children aged 5 to 15 years undergoing first permanent molar extraction

Spontaneous post-extraction space closure did not differ significantly between the maxilla and mandible (pooled OR 2.06, 95% CI 0.46 to 9.28; 3 studies; I2 = 72%); ungraded.

1 finding from 1 review

Post-secondary education vs University education

Prevalence of fair/poor self-rated oral health · Adults aged 25 years and older in Australia, Canada, New Zealand, and the United States

In Canada, post-secondary versus university education differed by 2.4 percentage points in prevalence of fair/poor self-rated oral health.

4 findings from 1 review
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Medium income vs High income

Mean number of decayed teeth (mean DT) · Adults aged 25 years and older in Australia, Canada, New Zealand, and the United States

In United States, medium versus high income differed by 0.1 decayed teeth in mean number of decayed teeth.

4 findings from 1 review
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Bilateral extraction of compromised mandibular first permanent molars vs Age- and gender-matched non-extraction controls

Skeletal development (occlusal plane rotation, facial height) · Children (approximately 11 years or older) with compromised mandibular first permanent molars

Bilateral lower first permanent molar extraction was associated with counter-clockwise rotation of the occlusal plane and a mild decrease in lower anterior face height in one case-control study; ungraded.

1 finding from 1 review

Low income vs High income

Prevalence of fair/poor self-rated oral health · Adults aged 25 years and older in Australia, Canada, New Zealand, and the United States

Across four countries, low versus high income differed by 15.77 percentage points in prevalence of fair/poor self-rated oral health (random-effects meta-analysis; I2=13.4%).

5 findings from 1 review
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Primary education vs University education

Mean number of decayed teeth (mean DT) · Adults aged 25 years and older in Australia, Canada, New Zealand, and the United States

In Canada, primary versus university education differed by 0.69 decayed teeth in mean number of decayed teeth.

5 findings from 1 review
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Secondary education vs University education

Prevalence of untreated decay (% DT > 0) · Adults aged 25 years and older in Australia, Canada, New Zealand, and the United States

In United States, secondary versus university education differed by 10.4 percentage points in prevalence of untreated decay.

4 findings from 1 review
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Passive tobacco exposure (prenatal maternal smoking or postnatal secondhand/household smoke) vs No passive tobacco exposure (non-exposed children)

Dental caries · Children and adolescents (general population, aged under 20 years)

In children and adolescents, passive tobacco exposure (prenatal or postnatal) is associated with higher odds of dental caries (pooled OR 1.53, 95% CI 1.39 to 1.68; 21 studies), though heterogeneity was high (I2=86.5%); certainty of evidence not graded.

1 finding from 1 review

Early extraction of a compromised first permanent molar vs Contralateral non-extraction side (same patient)

Development and eruption of the second permanent molar · Children aged 5 to 15 years with a compromised first permanent molar

Root closure and eruption of the second permanent molar appeared accelerated on the extraction side in a single case-control study; ungraded and not statistically tested.

1 finding from 1 review

Early extraction of a compromised mandibular first permanent molar vs Contralateral non-extraction side (same patient)

Development and eruption of the third molar · Children aged 5 to 15 years with a compromised first permanent molar

Development and eruption of the third molar appeared accelerated after early first permanent molar extraction in two studies (e.g., eruption OR 2.86, 95% CI 1.37 to 5.96); ungraded.

1 finding from 1 review

Early extraction of a compromised first permanent molar vs Teeth in the same arch/patient with the first permanent molar present

Caries and/or fillings in adjacent teeth · Children aged 5 to 15 years with a compromised first permanent molar

One study found fewer decayed or filled proximal surfaces but more decayed or filled occlusal surfaces in arches with an extracted first permanent molar; ungraded.

1 finding from 1 review

Early extraction of a compromised first permanent molar vs Non-extraction (retained first permanent molar) or contralateral non-extraction side

Spontaneous space closure · Children aged 5 to 15 years with a compromised first permanent molar

Early extraction of a compromised first permanent molar is followed by variable spontaneous closure of the post-extraction space (about 45.5% to 85.2% of cases); certainty was not GRADE-rated (Shekelle category III).

1 finding from 1 review

Dementia (any type or severity) vs Older people without dementia

Retained roots (mean number) · Older people (aged 60 years or older) with dementia

Retained roots were more common in older people with dementia (0.2 to 10) than without (0.0 to 1.2); no meta-analysis was performed (ungraded).

1 finding from 1 review

Dementia (any type or severity) vs Older people without dementia

Caries experience (mean DMFT) · Older people (aged 60 years or older) with dementia

The DMFT index was similar between groups, with only 1 of 5 comparative studies finding a significant difference; no meta-analysis was performed (ungraded).

1 finding from 1 review

Dementia (any type or severity) vs Older people without dementia

Denture use (prevalence) · Older people (aged 60 years or older) with dementia

Denture use was similar in older people with and without dementia, though one study reported lower denture use with more severe dementia; no meta-analysis was performed (ungraded).

1 finding from 1 review