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Preshaw PM. Periodontol 2000, 2012: 59: 7–13

This is a commentary on the 11 papers that comprise this edition of the journal. Two papers describe surgical techniques used to treat recession defects. The use of collagen membranes is recommended in order to avoid problems associated with harvesting donor tissue. In the substantive paper, some illustrations show the use of a bone graft combined with a collagen membrane. Another paper explores the continuing conundrum of osteoporosis and periodontal disease, but now overlaid by implant therapy and bisphosphonates drug therapy. It would not qualify as a Critical Issues edition, if there was not a paper on periodontal regeneration, the 'holy grail' of periodontal treatment. Other papers examine research methodology. Apart from highlighting the usual problems associated with randomisation, the pertinent ethical question is asked 'but what about the patients who participate in them (RCTs)?'