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

Authors

  • Yun-Chi Wang,

    1. Advanced Education in Implant Dentistry, Loma Linda University, School of Dentistry, Loma Linda, CA, USA
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    • This research was in partial fulfillment of a Master of Science in Dentistry degree for the primary author.
  • Joseph Y. K. Kan,

    Corresponding author
    1. Department of Restorative Dentistry, Loma Linda University, School of Dentistry, Loma Linda, CA, USA
    • Corresponding author:

      Joseph Y. K. Kan, DDS, MS

      Center for Implant Dentistry

      Loma Linda University School of Dentistry

      Loma Linda, California 92350

      USA

      Tel.: (011) 1- 909-558 4980

      Fax: (011) 1-909-558-4803

      e-mail: jkan@llu.edu

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  • Kitichai Rungcharassaeng,

    1. Department of Orthodontics and Dentofacial Orthopedics, Loma Linda University, School of Dentistry, Loma Linda, CA, USA
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  • Phillip Roe,

    1. Department of Restorative Dentistry, Loma Linda University, School of Dentistry, Loma Linda, CA, USA
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  • Jaime L. Lozada

    1. Advanced Education in Implant Dentistry, Loma Linda University, School of Dentistry, Loma Linda, CA, USA
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Abstract

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.

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