Summary of findings 2. Ball compared to telescopic 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: telescopic 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 telescopic attachment system | Risk with ball attachment system | |||||
| Patrix replaced (short term) Follow‐up: range 1 year to 3 years | Study population | RR 6.00 (0.86 to 41.96) | 22 (1 RCT) | ⊕⊝⊝⊝ VERY LOW1 | ||
| 91 per 1000 | 545 per 1000 (78 to 1000) | |||||
| Matrix activated (short term) Follow‐up: range 1 year to 3 years | Study population | RR 11.00 (0.68 to 177.72) | 22 (1 RCT) | ⊕⊝⊝⊝ VERY LOW1 | ||
| 0 per 1000 | 0 per 1000 (0 to 0) | |||||
| Matrix replaced (short term) Follow‐up: range 1 year to 3 years | Study population | RR 1.75 (0.71 to 4.31) | 22 (1 RCT) | ⊕⊝⊝⊝ VERY LOW1 | ||
| 364 per 1000 | 636 per 1000 (258 to 1000) | |||||
| Reline of implant overdenture (short term) Follow‐up: range 1 year to 3 years | Study population | RR 2.33 (0.81 to 6.76) | 22 (1 RCT) | ⊕⊝⊝⊝ VERY LOW1 | ||
| 273 per 1000 | 635 per 1000 (221 to 1000) | |||||
| *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; 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.