Efficacy of Guided Tissue Regeneration Membrane in the Healing of Apicomarginal Defects

Thirty patients meeting inclusion criteria were selected and allocated randomly into two groups: collagen membrane group and control group. Clinical and radiographic measurements were recorded during follow up at regular intervals of 0, 3, 6, 9, and 12 months after surgery. The criteria for success included the absence of clinical signs and symptoms, and complete or incomplete radiographic healing.