Surface Degradation of Nanocrystalline Zirconia Dental Implants

Abstract

Yttria-stabilized zirconia prepared by hot isostatic pressing represents attractive material for biomedical applications. In this work the degradation of yttria-stabilized zirconia dental implants abutments due to the tetragonal to monoclinic phase transformation after one year of clinical use was studied in detail. Microstructural characterization by Electron Back Scattering Diffraction was successfully applied. The amount and distribution of the monoclinic phase, the grain-size distribution and crystallographic orientations between tetragonal and monoclinic crystals in 3 mol.% yttria-stabilized polycrystalline zirconia were determined in two different types of abutments currently used in clinical practice. Clear crystallographic orientation relationship between parent tetragonal and daughter monoclinic phase was clearly observed. An important and novel conclusion is that no substantial bulk degradation of 3Y-TZP dental implant abutments was detected after 1 year of clinical use.

Can Oral Bacteria and Mechanical Fatigue Degrade Zirconia Dental Implants in Vitro?

“…To further assess physical changes on ZrO 2 implants post-immersion in oral bacteria and in combination with mechanical fatigue, the average monoclinic concentration was measured to quantify low-temperature degradation (LTD), which has been widely used in previous studies. ,− In order to isolate and better understand the individual and synergistic effects of oral bacterial adhesion and mechanical loading on ZrO 2 phase composition, six different implant sites were examined: the collar, junction, upper screw thread, upper screw valley, apical screw valley, and apical screw thread. For the specimens immersed in either early or late colonizing polyculture, all implant sites were exposed to oral bacteria.…”