 Buccal bony wall loss is a common sequela following tooth extraction, and guided bone regeneration GBR is a common treatment for the regeneration of ridge form and volume preservation allowing dental implant placement. Many bone augmentation biomaterials are employed to accomplish GBR, and both the medical dental community and, subsequently, patients benefit from understanding whether a given GBR biomaterial might be more efficacious. To this end, a randomized, case series comparison of allograft x-linked collagen membrane versus xenograft non-x-linked collagen membrane would be beneficial to both the dental community and patients. 