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Objectives  This 1‐year prospective study evaluated the implant success rate and marginal bone response of non‐submerged implants with platform and non‐platform switching abutments in posterior healed sites.    Material and methods  Nineteen patients (9 male, 10 female) with posterior partially edentulous spaces, between the ages of 23 and 76 (mean = 55.4 years), were included in this study. A total of 30 implants (15 implants restored with platform switching [ PS ] abutments [control] and 15 implants restored with non‐platform switching [ NPS ] abutments [test]) were assigned between two groups using a randomization procedure. The definitive abutments with conical connections were placed at the time of surgery, and the definitive restorations were placed at 3 months. All patients were evaluated clinically and radiographically using standardized radiographs at time of implant placement (0), 3, 6 and 12 months after implant placement. Data were analyzed using Friedman test with post hoc pairwise comparisons, Mann–Whitney U‐test, and Pearson's chi‐square test at the significance level of α = 0.05.    Results  At 12 months, all 30 implants remained osseointegrated corresponding to a 100% success rate. The overall mean marginal bone level change at 12 months was −0.04 ± 0.08 mm for  PS  group and −0.19 ± 0.16 mm for  NPS  group. Statistically significant difference in the marginal bone level change was observed between groups at 0 to 12 months and 3 to 12 months ( P  < 0.05).    Conclusions  This 1‐year randomized control study suggests that when a conical implant–abutment connection is present, similar peri‐implant tissue responses can be achieved with platform switching and non‐platform switching abutments.

Marginal bone response of implants with platform switching and non‐platform switching abutments in posterior healed sites: a 1‐year prospective study