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

Clin Oral Implants Res. 2015 Feb;26(2):220-7. doi: 10.1111/clr.12312. Epub 2014 Jan 3.


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.

Keywords: bone change; conical connection; implant; partial edentulism; platform switching; posterior healed site; subcrestal placement.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Alveolar Bone Loss / diagnostic imaging
  • Alveolar Bone Loss / etiology*
  • Bone Remodeling
  • Dental Abutments*
  • Dental Implant-Abutment Design*
  • Dental Implantation, Endosseous / methods*
  • Dental Implants / adverse effects*
  • Dental Restoration Failure
  • Female
  • Follow-Up Studies
  • Humans
  • Jaw, Edentulous, Partially / surgery
  • Male
  • Middle Aged
  • Osseointegration
  • Prospective Studies
  • Random Allocation
  • Young Adult


  • Dental Implants