Summary of findings 3. Ball compared to magnetic attachment systems for implant overdentures in edentulous jaws.
| Interventions for replacing missing teeth: attachment systems for implant overdentures in edentulous jaws | ||||||
| Patient or population: edentulous adults receiving implant overdentures in one or both jaws to overcome problems with conventional complete dentures Setting: dental clinics (university clinics and/or private practice clinics) Intervention: ball attachment system of mandibular overdentures Comparison: magnetic attachment system of mandibular overdentures | ||||||
| Outcomes | Anticipated absolute effects* (95% CI) | Relative effect (95% CI) | Number of participants (studies) | Certainty of the evidence (GRADE) | Comments | |
| Risk with magnetic attachment system | Risk with ball attachment system | |||||
| Success (medium term) Follow‐up: range 3 years to 5 years | Study population | RR 0.84 (0.64 to 1.10) | 69 (1 RCT) | ⊕⊝⊝⊝ VERY LOW1 | ||
| 826 per 1000 | 694 per 1000 (529 to 909) | |||||
| Re‐treatment (repair) (medium term) Follow‐up: range 3 years to 5 years | Study population | RR 1.75 (0.65 to 4.72) | 69 (1 RCT) | ⊕⊝⊝⊝ VERY LOW1 | ||
| 174 per 1000 | 304 per 1000 (113 to 821) | |||||
| Costs (medium term) Follow‐up: range 3 years to 5 years | The mean costs (medium term) was EUR 2286.34 | MD 247.37 EUR lower (346.32 lower to 148.42 lower) | ‐ | 69 (1 RCT) | ⊕⊝⊝⊝ VERY LOW1 | |
| *The risk in the intervention group (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI). CI: confidence interval; MD: mean difference; RCT: randomised controlled trial; RR: risk ratio. | ||||||
| GRADE Working Group grades of evidence High certainty: we are very confident that the true effect lies close to that of the estimate of the effect. Moderate certainty: we are moderately confident in the effect estimate: the true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different. Low certainty: our confidence in the effect estimate is limited: the true effect may be substantially different from the estimate of the effect. Very low certainty: we have very little confidence in the effect estimate: the true effect is likely to be substantially different from the estimate of effect. | ||||||
1Risk of bias (serious), imprecision (very serious); downgraded by 3 levels.