Jaw bone cyst is a common disease at OMS department The treatment is usually enucleated the lesion by dental curette via opening a large window on jaw bone, One of the most common complications following these surgical procedures is wound dehiscence, Here present a calcifying odontogenic cyst treated with modified technique which could offer good wound healing, The technique is to preserve the bone lateral to the lesion during making bone window, after tumor removed from bone, put the bony cap back to jaw and fixation with restorable suture, This cap offers support for flap and wound would not collapse or dehiscence, This cap also prevents soft tissue ingrowth into bone cavity, guided new bone formation, The GBR-like surgery is to prevent the wound dehiscence, Instrument choice, bone preservation and soft tissue care also reviewed and discussed.