Guided bone regeneration (GBR) has been applied in implant dentistry for increasing the width and height of the alveolar ridge in areas with insufficient bone. Various materials and tech niques have been used for this purpose. It refers to a surgical procedure by which utilizing a mechanical barrier to create a secluded space around the defect to permit bone regeneration without the competition of other tissues. This report presents a case with buccal fenestration on maxillary implant sites

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... rved during a surgical procedure. An allograft and a nonresorbable membrane were concomitantly used to increase the width of the alveolar ridge. Hard tissue regeneration was evident clinically. The implants were restored for functioning. Factors affecting outcomes are also discussed. Membrane stability and the spacemaking effect remain the keys to success. This case report and review describes the management of bony fenestration which was encountered during the implant placement procedure.