الفهرس 
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Abstract
This study was done to evaluate the effect of resorbable GTR on healing of jaw bone defects following surgical endodontic treatment. The clinical study included 20 patients of both sexes with ages ranging from (14-34) complaining from periapical lesions. The patients were randomly divided into two equal groups. After surgical enucleation of periapical pathoses with apicectomy resorbable membrane was applied as a cover seal of the resultant bony defects in the study group while the other group serves as control without membrane application. Healing was uneventful in all patients with no signs of inflammatory reactions throughout the study period and no significant difference was recorded regarding to pain, tenderness and swelling at different time intervals of follow up. In control group there was gradual decrease in the radiolucency with gradual decrease in the size of the bony defect indicating that gradual new bone formation had occurred at the periphery extending toward the center to fill the bony defects. There was rapid decrease in the radiolucency with resorbable membrane with earlier and faster decrease in the size of the bony cavity when compared with control group. Based on the results of this study it can be conclude that: The use of resorbable membrane is a promising materials and invaluable method to enhance new bone regeneration and still long term study are in need to further elucidate their effectiveness.