الفهرس 
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Abstract
The aim of the study was to evaluate the efficacy of a new material with and without Low intensity laser treatment in accelerating bone formation of an apical radiolucency through a surgical procedure.
The results of our present study in case of panoramic view (CBCT), it was found that group A (NBG) and C(L+NBG) showed increase in the grey scale value(bone density), while the third group B(LG) had shown lowest grey scale value, on the other hand, in case of cross-section view(CBCT), it was found that group C(L+NBG) had shown the highest grey scale value regarding the other two groups (NBG, LG).
from the obtained results of this study the following conclusions can be drawn:
1. The use of Nano-bone graft and Low intensity laser technique in endodontic surgery is considered an optimum choice, as they both accelerate bone and tissue healing.
2. The use of Low intensity laser decreases the post-operative pain and heals the periapical lesions, so it may be present as a paradigm shift in endodontic treatment in terms of decreasing the postoperative pain and healing.
3. The use of CBCT is considered the only effective method for measuring the grey value in the human jaw.