الفهرس 
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Abstract
This study was conducted to examine the ability of laboratory subjects Alkkawit and Alkestack silver crown to close the gap leading to a root canal in the teeth that have been stuffing the channel without roots to prepare for the nerve and the other promises prepared to nerve promises after dipped in artificial saliva for different periods.
This research was conducted on two hundred and sixty laughing a sound ادميا Sunni unilateral root root channels was prepared then divided into three groups.
The first group containing one hundred giggled have been using material Alkkawit with this group.
Group II and Tanua on one hundred giggled have been using Article Alkestack the silver with this group.
The third group contains a record sixty laughing as a group .
After that these teeth were subjected to thermal cycles then divided into smaller groups depending on whether been prepared to nerve promises or not.
The findings of this study is to :
First:
Article Alkkawit the best in its ability to close the gap crown root canal leading to of Article Alkestack the silver .
Second:
Prepare the nerve Aljdhirlaud channel increases the leakage of the dye has successfully curse if you leave a full root canal filler .
Third: to increase along the dye leakage with increasing duration of immersion in artificial saliva .
We also stress the need for further research with the use of these substances in the Dental ruined and exposing them to other effects such as the pressing force to confirm these results .