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 · All outcomes

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%

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

Metal-free FDPs (zirconia ceramic) vs Metal-ceramic FDPs

Periodontal/peri-implant status (secondary outcomes) · Adults (18 years or older) needing a three-unit fixed dental prosthesis (FDP)

The review found no eligible studies for this question.

1 finding from 1 review
  • No data were presented for any of the pre-specified secondary outcomes. The trial registered pocket depth, bleeding on probing and mobility at follow-up visits but did not report the data.
    0 studies
    No studies found

Metal-free FDPs (zirconia ceramic) vs Metal-ceramic FDPs

Patient satisfaction (measured by patient satisfaction or aesthetic scales) · Adults (18 years or older) needing a three-unit fixed dental prosthesis (FDP)

It is very uncertain whether metal-free FDPs (zirconia ceramic) changes aesthetic evaluation (patient aesthetic satisfaction changes) compared with metal-ceramic FDPs (very low certainty).

1 finding from 1 review

Metal-free FDPs (lithium disilicate) vs Metal-ceramic FDPs

Bridge failure · Adults (18 years or older) needing a three-unit fixed dental prosthesis (FDP)

It is very uncertain whether metal-free FDPs (lithium disilicate) changes bridge failure compared with metal-ceramic FDPs (very low certainty).

2 findings from 1 review

Metal-free implant abutments (zirconia) vs Metal implant abutments (titanium)

Marginal bone level change · Adults (18 years or older) with one missing tooth in the aesthetic zone needing an implant-supported single crown

Metal-free implant abutments (zirconia) showed no clear difference in marginal bone level change (MBLC) compared with metal implant abutments (titanium); GRADE not reported.

2 findings from 1 review

Metal-free implant abutments (zirconia) vs Metal implant abutments (titanium)

Periodontal or peri-implant status: gingival recession (REC) · Adults (18 years or older) with one missing tooth in the aesthetic zone needing an implant-supported single crown

Metal-free implant abutments (zirconia) showed no clear difference in gingival/mucosal recession (REC) compared with metal implant abutments (titanium); GRADE not reported.

1 finding from 1 review

Metal-free implant abutments (zirconia) vs Metal implant abutments (titanium)

Abutment failure · Adults (18 years or older) with one missing tooth in the aesthetic zone needing an implant-supported single crown

It is very uncertain whether metal-free implant abutments (zirconia) changes abutment failure compared with metal implant abutments (titanium) (very low certainty).

1 finding from 1 review

Metal-free implant abutments (zirconia) vs Metal implant abutments (titanium)

Implant probing pocket depth (PPD) · Adults (18 years or older) with one missing tooth in the aesthetic zone needing an implant-supported single crown

Metal-free implant abutments (zirconia) showed no clear difference in implant probing pocket depth (PPD) compared with metal implant abutments (titanium); GRADE not reported.

1 finding from 1 review

Metal-free implant abutments (zirconia) vs Metal implant abutments (titanium)

Aesthetics · Adults (18 years or older) with one missing tooth in the aesthetic zone needing an implant-supported single crown
1 finding from 1 review
  • Primary outcome aesthetic evaluation data were reported as the frequency of distribution of the Implant Crown Aesthetic Index (ICAI); no comparative summary estimate was presented.
    2 studies · 47 participants
    Very low

Metal-free single crowns (full-contour zirconia) vs Cast gold (conventional metal) single crowns

Crown failure · Adults (18 years or older) needing a single crown in the molar or premolar region

It is very uncertain whether metal-free single crowns (full-contour zirconia) changes crown failure compared with cast gold (conventional metal) single crowns (very low certainty).

2 findings from 1 review