TY  - BOOK
AU  - Mohamed Ahmed Mohamed Elmorsy
AU  - Lamia Sayed Kheiralla , 
AU  - Maha Ahmed Taymour , 
TI  - Effect of different repair techniques and aging on shear bond strength of repaired resin nano ceramic / 
PY  - 2015///
CY  - Cairo : 
PB  - Mohamed Ahmed Mohamed Elmorsy , 
KW  - Ceramic
KW  - Composite
KW  - Resin nano ceramic
N1  - Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Prosthodontics; Issued also as CD
N2  - The aim of the study is to evaluate the effect of different repair techniques and aging on the bond strength of the composite resin repair to composite nano ceramic material. A total of 30 samples were constructed from lava ultimate blocks (resin nano ceramic) for this study with standardized dimensions (7 X 7 X 2 mm3). Samples were divided according to surface treatment into 3 groups: Group I: Surface treatment using silica blasting (Cojet) technique. Group II: Surface treatment using sandblasting technique (50 æm alumina). Group III: No treatment (control) . Then surface roughness was measured by profilometer and a random selected sample from each group was scanned by electron microscope. Then repair layer was applied in accordance with the manufacturers{u2019} recommendations. All samples were stored in distilled water at 370c for 24 hours. Each group was further sub divided into 2 subgroups according to aging. Subgroup 1: Not subjected to aging. Subgroup 2: Subjected to aging. Then subgroups were aged by being subjected to thermo cycling for 500 cycles between 5 and 550C with interval time of 30 second. Each sample was subjected to a shear force at a crosshead speed of 0.5 mm / min using a universal testing machine until failure
ER  -