TY - BOOK AU - Hashem Mohammed Salem Alqudaimi AU - Omaima Salah Eldin Elmahallawi , AU - Omnia Abdelhamed Elshehy , TI - Influence of heat treatment on the fracture toughness and microstructure of yttria-zirconia ceramics : : An in vitro study / PY - 2011/// CY - Cairo : PB - Hashem Mohammed Salem Alqudaimi , KW - Fracture toughness KW - Heat treatment KW - Y-TZP ceramic N1 - Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Prosthodontics; Issued also as CD N2 - The principle aim of this investigation was to evaluate the influence of heat treatment on the fracture toughness and microstructure of yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) substrate. Forty ceramic dises (10-mm x 4-mm) were prepared from YZ blocks using CAD/CAM technology, and divided into four groups according to frequency of the heat treatments, ten samples for each group ER -