Findings

What do systematic reviews say?

2,256 questions · 2,339 findings · 262 reviews

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No studies found 555 · 23.7%GRADE not reported 398 · 17%Very low 572 · 24.5%Low 476 · 20.4%Moderate 240 · 10.3%High 98 · 4.2%

Intervention not reported

Any postoperative complication · adults aged 18 years or over undergoing general anaesthesia for non‐cardiac or non‐neurosurgical elective operations

The intervention probably leads to lower any postoperative complication (moderate certainty).

1 finding from 1 review

Processed electroencephalogram and evoked potential techniques for amelioration of postoperative delirium and… 2018 · Cochrane Headline outcomes only
RR 0.51 [0.37, 0.71]
1 study · 902 participants
Moderate

Intervention not reported

Postoperative length of stay (days) · adults aged 18 years or over undergoing general anaesthesia for non‐cardiac or non‐neurosurgical elective operations

1 finding from 1 review

Processed electroencephalogram and evoked potential techniques for amelioration of postoperative delirium and… 2018 · Cochrane Headline outcomes only
no estimate extracted
1 study · 1155 participants
Low

Metal-free implant-supported FDPs (zirconia-toughened alumina; In-Ceram Zirconia) vs Metal-free implant-supported FDPs (yttria-stabilized tetragonal zirconia; Denzir)

Periodontal/peri-implant status (secondary outcomes) · Adults (18 years or older) needing an implant-supported fixed dental prosthesis in the posterior region

The review found no eligible studies for this question.

1 finding from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
No data were presented for any of the pre-specified secondary outcomes. Follow-up visits registered pocket depth, bleeding on probing and mobility but the data were not reported.
0 studies
No studies found

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

Aesthetics · 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

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
No data were presented with regard to aesthetics.
0 studies
No studies found

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

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

1 finding from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
12 and 36 months
At 12 months and at 36 months 34 participants were available for analysis. No FDP failure was reported in either treatment approach at either time.
1 study · 34 participants
Very low

Metal-free implant-supported FDPs (zirconia-toughened alumina; In-Ceram Zirconia) vs Metal-free implant-supported FDPs (yttria-stabilized tetragonal zirconia; Denzir)

Bridge complications · Adults (18 years or older) needing an implant-supported fixed dental prosthesis in the posterior region

It is very uncertain whether metal-free implant-supported FDPs (zirconia-toughened alumina;… changes bridge complications compared with metal-free implant-supported FDPs (yttria-stabilized tetragonal… (very low certainty).

4 findings from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
60 months
OR 0.02 [0.00, 0.42]
1 study · 18 participants
Very low
Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
36 months
OR 0.02 [0.00, 0.30]
1 study · 18 participants
Very low
Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
12 months
OR 0.04 [0.00, 0.48]
1 study · 18 participants
Very low

Show 1 more finding

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
120 months
OR 0.02 [0.00, 0.48]
1 study · 17 participants
Very low

Metal-free cantilevered FDPs (feldspathic-veneered zirconia) vs Metal-ceramic cantilevered FDPs

Plaque · Adults (18 years or older) needing replacement of one premolar or incisor with a cantilevered fixed dental prosthesis

Metal-free cantilevered FDPs (feldspathic-veneered zirconia) showed no clear difference in plaque index (PI) compared with metal-ceramic cantilevered FDPs; GRADE not reported.

1 finding from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
24 months
MD -0.10 [-1.04, 0.84]
1 study · 19 participants
GRADE not reported

Metal-free cantilevered FDPs (feldspathic-veneered zirconia) vs Metal-ceramic cantilevered FDPs

Cantilevered bridge failure · Adults (18 years or older) needing replacement of one premolar or incisor with a cantilevered fixed dental prosthesis

1 finding from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
12, 24 and 36 months
At 12 months 19 participants were available; no failure and no complication were reported in either group. No failure was reported at 24 or 36 months.
1 study · 19 participants
Very low

Metal-free cantilevered FDPs (feldspathic-veneered zirconia) vs Metal-ceramic cantilevered FDPs

Gingival index (GI) · Adults (18 years or older) needing replacement of one premolar or incisor with a cantilevered fixed dental prosthesis

Metal-free cantilevered FDPs (feldspathic-veneered zirconia) showed no clear difference in gingival index (GI) compared with metal-ceramic cantilevered FDPs; GRADE not reported.

1 finding from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
24 months
MD 0.03 [-0.75, 0.81]
1 study · 19 participants
GRADE not reported

Metal-free tooth-supported FDPs (pressed veneering ceramic) vs Metal-free tooth-supported FDPs (layered veneering ceramic)

Aesthetics · Adults (18 years or older) needing a three-unit tooth-supported fixed dental prosthesis

1 finding from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
No comparative data were presented with regard to aesthetics. Aesthetics evaluated by the patient was reported dichotomously (yes/no) in the trial but no between-group estimate was presented.
1 study
GRADE not reported

Metal-free tooth-supported FDPs (pressed veneering ceramic) vs Metal-free tooth-supported FDPs (layered veneering ceramic)

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

1 finding from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
No comparative data were presented for the pre-specified secondary outcomes. The trial analyzed and reported plaque index, bleeding on probing and pocket probing depth but no between-group estimate was presented in the…
1 study
GRADE not reported

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

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
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 cantilevered FDPs (feldspathic-veneered zirconia) vs Metal-ceramic cantilevered FDPs

Cantilevered bridge complications · Adults (18 years or older) needing replacement of one premolar or incisor with a cantilevered fixed dental prosthesis

It is very uncertain whether metal-free cantilevered FDPs (feldspathic-veneered zirconia) changes cantilevered bridge complications compared with metal-ceramic cantilevered FDPs (very low certainty).

2 findings from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
24 months
OR 5.59 [0.23, 133.61]
1 study · 19 participants
Very low
Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
36 months
OR 2.00 [0.15, 26.73]
1 study · 19 participants
Very low

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

Bridge complications · 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 complications compared with metal-ceramic FDPs (very low certainty).

1 finding from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
72 months
OR 0.07 [0.01, 0.75]
1 study · 22 participants
Very low

Metal-free implant-supported FDPs (zirconia-toughened alumina; In-Ceram Zirconia) vs Metal-free implant-supported FDPs (yttria-stabilized tetragonal zirconia; Denzir)

Bridge failure · Adults (18 years or older) needing an implant-supported fixed dental prosthesis in the posterior region

1 finding from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
12, 36, 60 and 120 months
No FDP failures were reported in either group at 12, 36, 60 or 120 months (18 participants; 17 at 120 months).
1 study · 18 participants
Very low

Metal-free implant-supported FDPs (zirconia-toughened alumina; In-Ceram Zirconia) vs Metal-free implant-supported FDPs (yttria-stabilized tetragonal zirconia; Denzir)

Aesthetics · Adults (18 years or older) needing an implant-supported fixed dental prosthesis in the posterior region

The review found no eligible studies for this question.

1 finding from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
No data were presented with regard to aesthetics.
0 studies
No studies found

Metal-free tooth-supported FDPs (pressed veneering ceramic) vs Metal-free tooth-supported FDPs (layered veneering ceramic)

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

1 finding from 1 review

Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
12 and 36 months
At 12 months 40 participants were available and at 36 months 36 participants were available. No FDP failures were reported in either group at either time.
1 study · 40 participants
Very low

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 materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
72 months
OR 6.86 [0.66, 71.72]
1 study · 22 participants
Very low
Metal‐free materials for fixed prosthodontic restorations 2017 · Cochrane All outcomes
12 months
OR 9.00 [0.96, 84.50]
1 study · 37 participants
Very low

Intervention not reported

Observed hand hygiene compliance · Anaesthesiologists and CRNAs

1 finding from 1 review

Interventions to improve hand hygiene compliance in patient care 2017 · Cochrane Headline outcomes only
no estimate extracted
1 study · 1 participants
Moderate

Intervention not reported

Infection rates · Anaesthesiologists and CRNAs

The review found no eligible studies for this question.

1 finding from 1 review

Interventions to improve hand hygiene compliance in patient care 2017 · Cochrane Headline outcomes only
no estimate extracted
Studies not reported
No studies found