Kilinc A, et al. - This prospective randomized study aimed to compare primary and secondary healing and collagen membrane-based primary healing after surgical removal of partial impacted mandibular third molars, assessing the rate of postoperative complications and analyzing the swelling, mouth opening, and pain. In terms of swelling and mouth opening, the secondary closure gave a marked advantage over the primary closure. However, the absence of alveolitis in the primary closure using the collagen membrane and minimal wound dehiscence proposed that membrane use could support primary healing in terms of wound healing.