Nonresorbable membrane shows comparable bone gain, better soft tissue outcomes in severe ridge atrophy

This randomized controlled trial enrolled 22 patients with severe vertical alveolar ridge atrophy in the anterior edentulous mandible. Patients were randomized to receive either a split cortical bone plate technique with autogenous particulate grafts and a titanium-reinforced polytetrafluoroethylene membrane (T1) or the same technique with a mixture of autogenous and xenograft particulate grafts and a resorbable collagen membrane (T2). Outcomes were assessed at 6 months, 1 year, and 5 years postgrafting.

The primary outcome of vertical bone gain was reported as comparable between the two treatment groups. However, the abstract does not provide specific numerical measurements, effect sizes, or statistical tests for this comparison. For secondary outcomes, the T1 group (nonresorbable membrane) demonstrated better maintenance of keratinized gingiva and reduced crestal bone loss over time compared to the T2 group. Again, no absolute numbers, confidence intervals, or p-values were reported for these findings.

Safety and tolerability data were not reported in the abstract. The study's key limitation is its small sample size, with only 11 patients per treatment group. The lack of reported numerical results and statistical analyses significantly limits the strength of the conclusions. While the findings suggest potential clinical utility for nonresorbable membranes in enhancing both soft and hard tissue outcomes in complex augmentation cases, this evidence should be considered preliminary. Clinicians should await publication of the full study with complete data before drawing firm conclusions about comparative effectiveness.