title: Ridge Preservation Comparing a Nonresorbable PTFE Membrane to a Resorbable Collagen Membrane: A Clinical and Histologic Study in Humans.
abstract: OBJECTIVE
  The primary aim of this randomized, controlled, blinded clinical trial was to compare the effect of a resorbable collagen membrane (CM group) versus a nonresorbable high-density polytetrafluoroethylene membrane (PTFE group) on the clinical and histologic outcomes of a ridge preservation procedure.
  
  
  METHODS
  All 24 sites received an intrasocket cancellous allograft and a buccal overlay bovine derived xenograft.
  
  
  RESULTS
  The change in horizontal crestal ridge width was -1.4 ± 1.2 mm for the CM group, whereas the PTFE group lost -2.2 ± 1.5 mm, which was not statistically significant between groups (P > 0.05). Vertical ridge height change was -1.2 ± 1.5 for the CM group, whereas the PTFE group lost -0.5 ± 1.6, which was not significantly different between groups (P > 0.05). The percent vital bone was similar and not significantly different between groups. Primary closure was not obtained and the exposed membrane portion over the socket opening healed with keratinized tissue.
  
  
  CONCLUSIONS
  The choice of a resorbable versus a nonresorbable barrier membrane did not affect the clinical or the histologic outcome of ridge preservation treatment.
authors.affiliation: *Assistant Professor, Department of Periodontics, School of Dentistry, University of Louisville, Louisville, KY. †Professor, Director of Graduate Periodontics, Department of Periodontics, University of Louisville, Louisville, KY. ‡Associate Professor, Associate Dean for Postdoctoral Education, University of Louisville, Louisville, KY. §Professor, Chair, Department of Oral Health and Rehabilitation, University of Louisville, Louisville, KY. ¶Assistant Professor, Department of Periodontics, University of Louisville, Louisville, KY. ‖Assistant Professor, Department of Oral Pathology, University of Louisville, Louisville, KY. #Private Practice, Austin, TX.
authors.forename: Hussain
authors.initials: H
authors.lastname: Arbab
authors.forename: Henry
authors.initials: H
authors.lastname: Greenwell
authors.forename: Margaret
authors.initials: M
authors.lastname: Hill
authors.forename: Dean
authors.initials: D
authors.lastname: Morton
authors.forename: Ricardo
authors.initials: R
authors.lastname: Vidal
authors.forename: Brian
authors.initials: B
authors.lastname: Shumway
authors.forename: Nicholas D
authors.initials: ND
authors.lastname: Allan
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000517:prevention & control*; D000540:Alveolar Ridge Augmentation / Q000379:methods; D003094:Collagen / Q000627:therapeutic use*; D003758:Dental Implantation, Endosseous / Q000379:methods*; D005260:Female; D016557:Guided Tissue Regeneration, Periodontal; D006801:Humans; D008297:Male; D008567:Membranes, Artificial; D008875:Middle Aged; D011138:Polytetrafluoroethylene / Q000627:therapeutic use*
chemical_list: D008567:Membranes, Artificial; D011138:Polytetrafluoroethylene; D003094:Collagen