title: Secondary closure of an extraction socket using the double-membrane guided bone regeneration technique with immediate implant placement.
abstract: OBJECTIVE
  Immediate implantation presents challenges regarding site healing, osseointegration, and obtaining complete soft-tissue coverage of the extraction socket, especially in the posterior area. This last issue is addressed herein using the double-membrane (collagen membrane+high-density polytetrafluoroethylene [dPTFE] membrane) technique in two clinical cases of posterior immediate implant placement.
  
  
  METHODS
  An implant was placed immediately after atraumatically extracting the maxillary posterior tooth. The gap between the coronal portion of the fixture and the adjacent bony walls was filled with allograft material. In addition, a collagen membrane (lower) and dPTFE membrane (upper) were placed in a layer-by-layer manner to enable the closure of the extraction socket without a primary flap closure, thus facilitating the preservation of keratinized mucosa. The upper dPTFE membrane was left exposed for 4 weeks, after which the membrane was gently removed using forceps without flap elevation.
  
  
  RESULTS
  There was considerable plaque deposition on the outer surface of the dPTFE membrane but not on the inner surface. Moreover, scanning electron microscopy of the removed membrane revealed only a small amount of bacteria on the inner surface of the membrane. The peri-implant tissue was favorable both clinically and radiographically after a conventional dental-implant healing period.
  
  
  CONCLUSIONS
  Secondary closure of the extraction socket and immediate guided bone regeneration using the double-membrane technique may produce a good clinical outcome after immediate placement of a dental implant in the posterior area.
authors.affiliation: Department of Dentistry, Inha University School of Medicine, Incheon, Korea.
authors.forename: Jeong-Ho
authors.initials: JH
authors.lastname: Yun
authors.forename: Choong Man
authors.initials: CM
authors.lastname: Jun
authors.forename: Nam-Sik
authors.initials: NS
authors.lastname: Oh
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