The use of osseointegrated dental implants for replacement of missing teeth is considered a reliable treatment option, with a cumulative survival rate of almost 88% after a 36-year follow-up. Comparable long-term outcomes have been reported for implants inserted in either pristine or augmented bone in terms of interproximal bone levels and dimensions of buccal bone and mucosa. Interestingly, implant survival of up to 20 years after insertion seems to be higher for implants placed in augmented sites, stressing the importance of an adequate amount of supporting bone circumferentially around the implant. Guided bone regeneration (GBR) technique has been developed to assist and promote bone healing by preventing nonosteogenic cells from migrating into a bone defect by means of barrier membranes. When applied to localized alveolar defects, GBR allows restoration of an adequate contour of the atrophic alveolar ridge and ensures a proper quantity and quality...

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