Osseointegration of titanium, titanium alloy and zirconia dental implants: current knowledge and open questions

Abstract
Bone healing around dental implants follows the pattern and sequence of intramembraneous osteogenesis with formation of woven bone first of all followed later by formation of parallel‐fibered and lamellar bone. Bone apposition onto the implant surface starts earlier in trabecular bone than in compact bone. While the first new bone may be found on the implant surface around 1 week after installation, bone remodeling starts at between 6 and 12 weeks and continues throughout life. Bone remodeling also involves the bone–implant interface, thus transiently exposing portions of the implant surface. Surface modifications creating micro‐rough implant surfaces accelerate the osseointegration process of titanium implants, as demonstrated in numerous animal experiments. Sandblasting followed by acid‐etching may currently be regarded as the gold standard technique to create micro‐rough surfaces. Chemical surface modifications, resulting in higher hydrophilicity, further increase the speed of osseointegration of titanium and titanium‐zirconium implants in both animals and humans. Surface modifications of zirconia and alumina‐toughened zirconia implants also have an influence on the speed of osseointegration, and some implant types reach high bone‐to‐implant contact values in animals. Although often discussed independently of each other, surface characteristics, such as topography and chemistry, are virtually inseparable. Contemporary, well‐documented implant...

Source: Periodontology 2000 - December 20, 2016 Category: Dentistry Authors: Dieter D. Bosshardt, Vivianne Chappuis, Daniel Buser Tags: Review Article Source Type: research