Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

2,297 questions · 3,638 findings · 215 reviews · 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%

Metal-free implant-supported single crowns (zirconia veneered with feldspathic ceramic) vs Metal-ceramic implant-supported single crowns

Implant crown complications · 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-supported single crowns (zirconia veneered with… changes implant crown complications compared with metal-ceramic implant-supported single crowns (very low certainty).

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

Metronidazole + SRP vs Amoxicillin + metronidazole + SRP

Clinical attachment level (CAL) · Adults with periodontitis (chronic and aggressive)

Metronidazole + SRP showed no clear difference in clinical attachment level (CAL) compared with amoxicillin + metronidazole + SRP; GRADE not reported.

2 findings from 1 review

Metronidazole + SRP vs Amoxicillin + metronidazole + SRP

Adverse events · Adults with periodontitis (chronic and aggressive)

Metronidazole + SRP showed no clear difference in adverse events compared with amoxicillin + metronidazole + SRP; GRADE not reported.

1 finding from 1 review

Metronidazole + SRP vs Amoxicillin + metronidazole + SRP

Probing pocket depth · Adults with periodontitis (chronic and aggressive)

Metronidazole + SRP showed no clear difference in probing pocket depth compared with amoxicillin + metronidazole + SRP; GRADE not reported.

2 findings from 1 review

Metronidazole + SRP vs Amoxicillin + metronidazole + SRP

Percentage of bleeding on probing (BOP) · Adults with periodontitis (chronic and aggressive)

Metronidazole + SRP showed no clear difference in percentage of bleeding on probing (BOP) compared with amoxicillin + metronidazole + SRP; GRADE not reported.

2 findings from 1 review

Metal post of one alloy type vs Metal post of a different alloy type

Outcome not reported · Participants with permanent endodontically-treated (root-filled) teeth for which a post is indicated to retain the final restoration

The review found no eligible studies for this question.

1 finding from 1 review

Prefabricated metal post and core (Category II) vs Metal custom-cast post and core (Category I)

Outcome not reported · Participants with permanent endodontically-treated (root-filled) teeth for which a post is indicated to retain the final restoration

The review found no eligible studies for this question.

1 finding from 1 review

Single-stage alginate impression (simplified method) vs Two stage-two step zinc-oxide eugenol (ZoE) traditional method

Participant-reported quality of the denture (general satisfaction) · Completely edentulous people

It is very uncertain whether single-stage alginate impression (simplified method) changes participant-reported quality of the denture (general satisfaction) compared with two stage-two step zinc-oxide eugenol (ZoE) traditional method (very low certainty).

1 finding from 1 review

Single-stage alginate impression (simplified method) vs Two stage-two step elastomer (silicone, polysulfide, or polyether) conventional method

Operator-assessed quality of the denture · Completely edentulous people
1 finding from 1 review

Single-stage alginate impression (simplified method) vs Two stage-two step elastomer (silicone, polysulfide, or polyether) conventional method

Participant-reported quality of the denture (general satisfaction) · Completely edentulous people

It is very uncertain whether single-stage alginate impression (simplified method) changes participant-reported quality of the denture (general satisfaction,… compared with two stage-two step elastomer (silicone, polysulfide, or polyether)… (very low certainty).

1 finding from 1 review

Single-stage alginate impression (simplified method) vs Two stage-two step zinc-oxide eugenol (ZoE) traditional method

Oral health-related quality of life · Completely edentulous people

It is very uncertain whether single-stage alginate impression (simplified method) changes participant-reported oral health-related quality of life (OHIP-EDENT) compared with two stage-two step zinc-oxide eugenol (ZoE) traditional method (very low certainty).

1 finding from 1 review