Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,966 questions · 3,201 findings · 165 reviews · All outcomes

No studies found 25 · 0.8%GRADE not reported 2,717 · 84.9%Very low 167 · 5.2%Low 124 · 3.9%Moderate 132 · 4.1%High 36 · 1.1%

Genome-wide common variants (additive dosage; GWAS meta-analysis) vs Genome-wide significance threshold (P<5E-8)

Periodontal disease - novel loci (meta-analysis) · Adults from Japanese and European cohorts (present study + GLIDE + UK Biobank + BioBank Japan); periodontal disease cases vs controls

The meta-analysis found no novel loci for periodontal disease; the European SIGLEC5/chr19 locus did not replicate in Japanese populations; ungraded.

1 finding from 1 review
  • Genome-wide association meta-analysis identifies two novel loci associated with dental caries. 2024 All outcomes
    Lifelong (germline genotype) · Population-based genetic association study (Japanese + European cohorts) · Meta-analysis: present study + GLIDE + UKB + BBJ
    Meta-analysis of periodontal disease identified only previously known loci; no novel loci. The chromosome-19 SIGLEC5 locus associated with periodontitis in Europeans was not replicated in Japanese populations (present…
    4 studies · 764572 participants
    GRADE not reported

CPP-ACP enamel pre-treatment for prevention of white spot lesions before bonding metallic orthodontic brackets vs No enamel pre-treatment before bonding, or treatment with another material

Shear bond strength (SBS) of metallic orthodontic brackets · Extracted permanent human teeth (enamel); sound or demineralized

CPP-ACP enamel pre-treatment before bonding did not significantly affect the shear bond strength of metallic orthodontic brackets (MD 1.163 MPa, 95% CI -0.321 to 2.648; ungraded).

1 finding from 1 review

CPP-ACP enamel pre-treatment for prevention of white spot lesions before bonding metallic orthodontic brackets vs No enamel pre-treatment before bonding, or treatment with another material

Shear bond strength (SBS) of metallic orthodontic brackets · Sound enamel of extracted permanent human teeth

When used to prevent white spot lesions on sound enamel, CPP-ACP pre-treatment did not significantly affect shear bond strength (MD 1.009, 95% CI -0.723 to 2.740; ungraded).

1 finding from 1 review

CPP-ACP enamel pre-treatment for remineralization of white spot lesions before bonding metallic orthodontic brackets vs No enamel pre-treatment before bonding, or treatment with another material

Shear bond strength (SBS) of metallic orthodontic brackets · Demineralized enamel of extracted permanent human teeth

When used to remineralize white spot lesions on demineralized enamel, CPP-ACP pre-treatment did not significantly affect shear bond strength (MD 1.501, 95% CI -0.630 to 3.632; ungraded).

1 finding from 1 review

Fluoride concentration relative to the acceptable range (electrometric ion-selective electrode measurement; acceptable range mostly 0.6-0.8 ppmF) vs None (descriptive proportion meta-analysis)

Water samples with fluoride concentration below the acceptable range · Artificially fluoridated public water supply in Brazilian cities (water samples under external control)

In the Northeast Brazilian region, a pooled 79.7% of water samples had fluoride below the acceptable range; ungraded.

2 findings from 1 review

Fluoride concentration relative to the acceptable range (electrometric ion-selective electrode measurement; acceptable range mostly 0.6-0.8 ppmF) vs None (descriptive proportion meta-analysis)

Water samples with fluoride concentration above the acceptable range · Artificially fluoridated public water supply in Brazilian cities (water samples under external control)

In the Southeast Brazilian region, a pooled 11.5% of water samples had fluoride above the acceptable range; ungraded.

2 findings from 1 review

Fluoride concentration relative to the acceptable range (electrometric ion-selective electrode measurement; acceptable range mostly 0.6-0.8 ppmF) vs None (descriptive proportion meta-analysis)

Water samples with fluoride concentration outside the acceptable range · Artificially fluoridated public water supply in Brazilian cities (water samples under external control)

In Brazilian cities using external control, more than half of artificially fluoridated public water supply samples (pooled 56.6%, 95% CI 45.5 to 67.3) had fluoride concentrations outside the acceptable range, with very high heterogeneity (I2=99.5%); ungraded.

3 findings from 1 review

Artemether vs Quinine

Death · Patients with severe malaria

The fixed-effect NMR reported a difference between artemether and quinine at ages 15 years or more; no GRADE assessment was reported.

2 findings from 1 review

Pulp-status assessment method

Pulp necrosis · Vital teeth

The pooled incidence with radiographic assessment was 4.95%.

2 findings from 1 review

All exposure-OHRQoL estimates pooled for publication-bias correction (meta-trim sensitivity); specific exposure set not defined in source vs Not specified

Poor oral health-related quality of life (OHRQoL) · Children aged 3-12 years

A trim-and-fill sensitivity analysis pooling every exposure estimate gave an overall OR of 0.17 (95% CI 0.13-0.21) after correcting for significant publication bias (Fig. 13); this combined estimate spans heterogeneous exposures and is a publication-bias sensitivity result (ungraded).

1 finding from 1 review

E-cigarette aerosol / e-liquid exposure (flavored and unflavored; nicotine and non-nicotine) vs Unexposed controls / unflavored e-liquid / conventional cigarette smoke

Enamel/dental hard-tissue changes and e-liquid cariogenic properties (demineralization, colour change, pH, sugar content, metals) · Oral bacteria (streptococci), dental hard tissue (enamel/dentin) and e-liquids studied in vitro/ex vivo (with a few clinical microbiome…

In vitro evidence suggests e-liquids are often acidic and sugar-containing and can alter enamel/dentin colour and properties, supporting a plausible cariogenic effect, but findings are heterogeneous and not pooled (ungraded, narrative).

1 finding from 1 review

Oral cancer patients (cases) vs Healthy controls

Periodontal parameters (all measures pooled) in OC cases vs controls · Adults in case-control studies (oral cancer patients vs healthy controls)

Pooling all periodontal measures, oral cancer patients had worse periodontal status than controls (SMD 0.95, 95% CI 0.41-1.49; very high heterogeneity, I2=96.8%); ungraded. Note this pools clinically different measures.

1 finding from 1 review

rs10974056 effect allele A (intron variant in GLIS3, chr9:3,889,264) vs Non-effect allele C

Dental caries · Adults from Japanese and European cohorts (present-study Japanese direct-to-consumer cohort + GLIDE consortium and UK Biobank European…

Meta-analysis identified a novel genome-wide-significant locus for dental caries at rs10974056 in GLIS3 (P=3.93E-08); ungraded.

1 finding from 1 review

rs4801882 effect allele G (intron variant in SIGLEC5, chr19:52,127,053) vs Non-effect allele A

Dental caries · Adults from Japanese and European cohorts (present-study Japanese direct-to-consumer cohort + GLIDE consortium and UK Biobank European…

Meta-analysis identified a novel genome-wide-significant locus for dental caries at rs4801882 in SIGLEC5 (P=1.71E-08); ungraded.

1 finding from 1 review

Malocclusion vs No malocclusion

Impaired OHRQoL measured with CPQ 11-14 (quantitative synthesis / meta-analysis) · Adolescents (10-19 years)

Malocclusion (DAI) probably increases the prevalence of impaired OHRQoL (CPQ 11-14) by about 15% in adolescents (RR/PR 1.15, 95% CI 1.12-1.18; moderate certainty).

1 finding from 1 review

P11-4 + fluoride varnish vs CPP-ACP

Remineralization / reduction in lesion severity (change in QLF, laser fluorescence, or lesion area) · People or specimens with white spot lesions or early caries lesions

The NMA estimated an SMD of -0.78 for P11-4 + fluoride varnish versus CPP-ACP (95% CI -1.33 to -0.28).

1 finding from 1 review

Learning disability (CLD) vs No learning disability (CNLD)

Unmet dental treatment need · Children aged 1-18 years

Narrative reports from 6 studies suggested greater unmet dental treatment need in children with learning disabilities (5 of 6 studies), but no quantitative data were available (certainty not graded).

1 finding from 1 review

Older adults (population mean age >33.4 years) vs Younger adults (population mean age <=33.4 years)

Caries experience (mean DMFT) · Adults aged 19-60 years

Studies of older adults (mean age >33.4 years) had higher pooled DMFT than younger adults, but the age to DMFT meta-regression was not statistically significant; ungraded observational evidence.

5 findings from 1 review
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