الفهرس 
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Abstract
This study evaluated the impact of aging and sol gel nano silica coating on shear bond strength of zirconia ceramics discs and their impact on microleakage and internal adaptations of zirconia ceramics wns.
Sixty specimens of ceramics were produced and separated into discs and crowns according to test they would be subjected to:
-Twenty discs specimens for bond strength measurement.
-Forty crowns specimens for microleakage and internal adaptation measurement. They were divided into two groups (30 specimens each):
group N: 10 specimens of disc and 20 specimens of crowns with Nano silica surface treatment.
group W: 10 specimens of disc and 20 specimens of crowns without nano silica surface treatment. Then subdivided into two subgroups (15 samples each) based on thermodynamic aging into:
Subgroup Nt: specimen with nano silica surface treatment and thermodynamic aging. (15 samples: 5 disc and 10 crowns).
Subgroup No: specimen with nano silica surface treatment and without thermodynamic aging. (15 samples: 5 disc and 10 crowns).
Subgroup Wt: specimen without nano silica surface treatment and with thermodynamic aging. (15 samples: 5 disc and 10 crowns).
Subgroup Wo: specimen without nano silica surface treatment and without thermodynamic aging. (15 samples: 5 disc and 10 crowns).
Then they subdivided into three classes (5 samples each) based on test subjected into:
Class 1 NT: 5 disc specimens with nano silica and thermodynamic aging for bond strength measurement.
Class 2 NT: 5 crowns with nano silica and thermodynamic aging for microleakage measurement.
Class 3 NT: 5 crowns with nano silica and thermodynamic aging for internal adaptation measurement.
Class 1 No: 5 disc specimens with nano silica and without thermodynamic aging for bond strength measurement.
Class 2 No: 5 crowns with nano silica and without thermodynamic aging for microleakage measurement.
Class 3 No: 5 crowns with nano silica and without thermodynamic aging for internal adaptation measurement.
Class 1 Wt: 5 disc specimens without nano silica and with thermodynamic aging for bond strength measurement.
Class 2 Wt: 5 crowns without nano silica and with thermodynamic aging for microleakage measurement.
Class 3 Wt: 5 crowns without nano silica and with thermodynamic aging for internal adaptation measurement.
Class 1 Wo: 5 disc specimens without nano silica and without thermodynamic aging for bond strength measurement.
Class 2 Wo: 5 crowns without nano silica and without thermodynamic aging for microleakage measurement.
Class 3 Wo: 5 crowns without nano silica and without thermodynamic aging for internal adaptation measurement.
Results
Following the collection, tabulation, and statistical analysis of data, the following results were drawn:
1- In shear bond strength test, nano silica group is the best group has an improvement in SBS.
2- In microleakage test, nano silica group has the least microleakage.
3- In internal adaptation test, nano silica group has the best internal adaptations among the groups.