الفهرس | Only 14 pages are availabe for public view |
Abstract Zirconia has been considered an alternative material to titanium for implant manufacturing, however improving the mechanisms regarding to bone healing in presence of zirconia implants remains poorly known. The objective of this study was to evaluate and characterize three novel surface treatments selective infiltration etching (SIE), fusion sputtering (FS) and low pressure particle abrasion (LPPA) qualitatively and quantitatively on zirconia discs in parameters of roughness, porosity and hardness laboratory, and experimentally on rabbit model to evaluate bone healing around titanium and zirconia implants in a period of six weeks. This was achieved through histological evaluation via recording bone implant contact (BIC) and bone volume density (BVD) percentage. For the laboratory work 24 yttrium, partially stabilized, tetragonal zirconia, polycrystal material (Y-TZP) custom made discs divided into 4 groups 6 each: As sintered (AS ) micro-roughened (FS, LPPA) and nanoroughned (SIE) and tested for roughness, porosity and hardness using different apparatuses: scanning electron microscope (SEM), atomic force microscope (AFM), Profilometer, Mercury Porosimetry, and Vickers microhardness test. For experimental work, twenty rabbits were randomly divided into 5 groups 4 each, according to type of implant used in each group. The rabbits received the Ti and zirconia implants in the head of femur bone. After healing periods of 6 weeks, animals were sacrificed, the impl |