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Pozzi, Agliardi, Tallarico and Barlattani (2012) conducted a trial in 34 partially edentate patients who required at least two single implant‐supported crowns. A split‐mouth design was used in which one of two different prosthetic interfaces and configurations: internal conical connection with back‐tapered collar and platform shifting (CC) or external‐hexagon implants with flat‐to‐flat implant‐abutment interface (EH), were randomly allocated at each edentulous site. From a total of 88 implants included in the trial, the authors concluded that both implants performed similarly in terms of failure rates.

Key features include the following:

 Design: Single‐centre, split‐mouth, random allocation,

 Endpoint: Failure rates and marginal bone loss,

 Size: 34 patients with 88 edentulous sites,

 Analysis: Comparing implants using paired t‐tests at several intervals postrandomisation,

 Conclusion: Lower marginal bone loss with CC when compared to EH.