Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

2,297 questions · 3,638 findings · 215 reviews · Oral Health

No studies found 98 · 2.7%GRADE not reported 2,946 · 81%Very low 263 · 7.2%Low 158 · 4.3%Moderate 137 · 3.8%High 36 · 1%

Overweight vs Normal Weight or Non‐Obese

Caries experience (mean DMFT) · Brazilian children/adolescents in permanent dentition (BMI classified by CDC 2000 growth charts)

Overweight may make little or no difference to caries experience (DMFT) in the permanent dentition (very low certainty).

1 finding from 1 review

Oral cancer patients (cases) vs Healthy controls

Mean number of missing teeth in OC cases vs controls · Adults in case-control studies (oral cancer patients vs healthy controls)

The mean number of missing teeth did not differ significantly between oral cancer patients and controls (SMD 0.59, 95% CI -0.04 to 1.22); ungraded.

1 finding from 1 review

Probiotics vs placebo or control

Lactobacillus count (CFU/mL) · Children and/or adolescents (<18 years) without background systemic disease

Probiotics may make little to no difference to Lactobacillus count versus control (MD -0.78 CFU/mL, 95%CI -1.65 to 0.09; very low certainty).

1 finding from 1 review

CO2 laser combined with fluoride vs Fluorides alone (monotherapy)

Enamel demineralization (QLF ΔF) · Human enamel specimens under cariogenic challenge (in situ / ex vivo)

Evidence on a synergistic effect of combining CO2 laser with fluoride versus fluoride alone is mixed: one ex-vivo study found combined treatment superior while another found no synergy (ungraded, 2 ex-vivo studies, no pooled estimate).

1 finding from 1 review

M2 Demirjian stages F-G vs M2 Demirjian stages E-D

Spontaneous space closure · Children and adolescents with maxillary permanent first molar extraction

In the maxilla, M2 Demirjian stages F-G were not associated with a statistically significant difference in space closure odds.

1 finding from 1 review

Second molar at Demirjian stage E-F at extraction vs Second molar at Demirjian stage G-H at extraction

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

In the mandible, Demirjian stage E-F vs G-H was not significantly associated with space closure (OR 4.44; not GRADE-rated).

1 finding from 1 review

Overweight/obesity (combined) vs Normal Weight or Non‐Obese

Dental caries prevalence · Brazilian children/adolescents in permanent dentition (BMI classified by WHO 2006 Z-score)

A meta-analysis of 2 studies (permanent dentition, WHO 2006 Z-score) was rated very low certainty; the pooled effect was not shown in the article.

1 finding from 1 review

Second molar at Demirjian stage A-D at extraction vs Second molar at Demirjian stage F-H at extraction

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

In the mandible, earlier Demirjian stage A-D (vs F-H) increases odds of space closure (OR 3.11; low certainty).

1 finding from 1 review

Genome-wide common variants (aggregate additive; LD score regression) vs Not applicable (variance-component estimate)

Periodontal disease - SNP-based heritability · Japanese adults (present-study cohort)

SNP-based heritability of periodontal disease was low (h2=0.0519, SE 0.0182); ungraded.

1 finding from 1 review

GG genotype vs GA+AA genotypes

Dental caries · Children (<18 years) with vs without dental caries

After removing Zhang 2006, the recessive model at BsmI(rs1544410) remained non-significant (OR 0.86); ungraded.

2 findings from 1 review

Moderate-severe active dental caries (exposure) vs Caries-free or mild dental caries (control)

Salivary IL-8 level (pg/mL) · Children and young adults (3-25 years)

Salivary IL-8 levels are higher in children and young adults with active dental caries than in controls but the difference is not statistically significant (SMD 57.20 pg/mL, 95% CI -18.60 to 133.00; 7 studies); ungraded.

1 finding from 1 review

Institutionalization (living in an orphanage/institution) vs Parented children living with their families

Mean DMFT (decayed, missing, filled permanent teeth) · Institutionalized orphan children (roughly 3 to 18 years)

Permanent-teeth caries experience (DMF) was marginally higher in institutionalized children but essentially similar to parented children (pooled MD 0.09, not significant; very low certainty).

1 finding from 1 review

AA+GG (homozygous) genotypes vs GA (heterozygous) genotype

Dental caries · Children (<18 years) with vs without dental caries

After removing Zhang 2006, the over-dominant model at BsmI(rs1544410) remained non-significant (OR 0.85); ungraded.

2 findings from 1 review

Obesity (Unclassified) vs Normal Weight or Non‐Obese

Dental caries prevalence · Brazilian children/adolescents in permanent dentition (BMI classified by CDC 2000 growth charts)

Normal-weight adolescents in the permanent dentition probably have greater odds of dental caries than obese peers (OR 2.53; moderate certainty).

1 finding from 1 review