Guided tissue regeneration has been shown to establish new attachment in periodontal defects and to facilitate hard tissue repair around dental implants. This case report describes a patient treated with guided tissue regeneration adjacent to an endosseous dental implant. Histologic analysis showed the regenerated tissue to be mature, cortical bone possessing a high level of mineralization. Schlagwörter: bone regeneration, dental implants, guided tissue regeneration, histology, implantology