Effect of Platform Shift/Switch on Crestal Bone Levels and Mucosal Profile Following Flapless Surgery and Crestal/Subcrestal Implant Placement

Jaebum Lee, Tiago Fiorini, Inãki Gamborena, Brent A. Wenzel, Peter Schüpbach, Ulf M E Wikesjö, Cristiano Susin

Research output: Contribution to journalArticle

3 Scopus citations


Background: Crestal remodeling/bone loss appears a common sequel to dental implant placement. Several hypotheses and clinical strategies have been advanced to explain and avert crestal remodeling; however, causative mechanisms remain unclear and the efficacy of clinical protocol uncertain. Objective: The objective of the present study was to provide a histologic record of crestal versus subcrestal implant placement on crestal remodeling and mucosal profile comparing platform shift/switch and standard abutments following flapless implant surgery using a dog model. Methods: Four dental implants each were placed into the left and right edentulated posterior mandibles in five adult male hound-Labrador mongrel dogs using a flapless approach including crestal versus subcrestal placement and using platform shift versus standard abutments. Block biopsies were collected for histological/histometric analysis following an 8-week healing interval. Results: Both crestal and subcrestal implant installation resulted in significant crestal remodeling and bone loss, in particular at buccal sites, without significant differences between platform shift/switch and standard abutments. Implants installed subcrestally exhibited a significantly taller mucosal profile over crestal-level implants without significant differences between platform shift/switch and standard abutments; the epithelial attachment at all times arrested on the abutment surface. Conclusions: Comparing platform shift/switch versus standard abutments using a minimally invasive flapless approach including crestal or subcrestal implant placement, the platform shift/switch abutments offer no selective advantage over standard abutments.

Original languageEnglish (US)
Pages (from-to)73-81
Number of pages9
JournalClinical Implant Dentistry and Related Research
Issue number1
Publication statusPublished - Feb 1 2016



  • Alveolar bone
  • Animal models
  • Crestal remodeling
  • Crestal resorption
  • Dental implants
  • Platform shift
  • Platform switch

ASJC Scopus subject areas

  • Oral Surgery
  • Dentistry(all)

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