الفهرس 
ACKNOWLEDGEMENTOnly 14 pages are availabe for public view
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Abstract
The aim of the present study was to evaluate the: -Microleakage of endodontically treated teeth sealed with three different based canal sealing materials: Zinc oxide based, Silicone based, and Resin based sealers under three different pressures that the diver subject to; 1. 1 bar which represent the sea water surface level and was considered as ”control group” 2. 2.4 bar which represented 14 meter depth under the sea water surface level that is considered ”the therapeutic group for adults” 3. 5.2 bar which represented 42 meter depth that is considered (the maximum limit for self-contained underwater breathing apparatus ”SCUBA”.