Retention of crestal bone subsequent to implant placement was never a major concern. For years, loss to the first thread on the fixture was accepted as the norm. Insane yes, but accepted nonetheless. AstraTech, Straumann
and now Zimmer
have restructured their product line
to include bone level fixtures and collar and platform design that will ensure crestal bone loss is either negligible or non-existent.
From Dr. Bicuspid
May 16, 2011 — Zimmer Dental has introduced the Tapered Screw-Ventimplant, with full texturing and crestal microgrooves designed to create favorable conditions for marginal bone preservation.