Oh 2006.
| Methods | Trial design: randomised, parallel group trial Location: Ann Arbor, USA Number of centres: one (University of Michigan dental clinic, Ann Arbor, USA) Recruitment period: not stated Funding source: not stated |
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| Participants | Inclusion criteria: 2 single teeth missing in the anterior maxilla (premolar to premolar) allowing the placement of at least 10 mm long implants with a diameter of 3.8 mm Exclusion criteria: none specified Age at baseline: immediate 45.2 ±13.2; delayed 47.3 ±17.8 Gender: immediate M8/F4; delayed M2/F10 Number randomised: 24 Number evaluated: 24 |
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| Interventions |
Comparison: Immediate versus conventional loading Gp A (n = 12) Immediate loading: Single implants placed with a flapless technique and restored first with acrylic restorations and then 10‐14 days later replaced with cemented metal‐ceramic crowns Gp B (n = 12) Conventional loading: Single implants placed with a flapless technique and restored with cemented metal‐ceramic crowns after 4 months Zimmer (Zimmer, Carlsbad, Ca, USA) non‐submerged implants were used Duration of follow‐up: 6 months |
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| Outcomes | Prosthesis/implant failures, probing pocket depths, plaque index, sulcus bleeding index, marginal level of soft tissues, soft tissue thickness, width of the keratinised mucosa, Papilla Index by Jemt 1997 6‐month data used |
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| Notes | Sample size calculation: not reported but small sample size noted by the authors as a limitation of this study | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Unclear risk | Reported in the article: "The subjects were randomly assigned to one of two groups: IL (12 patients) or DL (12 patients)" No reply to letter |
| Allocation concealment (selection bias) | Unclear risk | Nothing reported in the article No reply to letter |
| Blinding of outcome assessment (detection bias) All outcomes | Low risk | Reported in the article: "All of the clinical measurements were performed by one calibrated blind examiner at baseline (at the time of implant loading) and at 2, 4, and 6 months after implant loading" |
| Incomplete outcome data (attrition bias) All outcomes | Low risk | All data presented |
| Selective reporting (reporting bias) | Low risk | All outcomes appear to be presented |
| Other bias | Low risk | None detected |