title: A modified surgical technique for root coverage with an allograft: a 12-month randomized clinical trial.
abstract: BACKGROUND
  The aim of this randomized controlled clinical study is to investigate whether a modified surgical technique could provide better results for root coverage and greater amounts of keratinized tissue (KT) with the acellular dermal matrix graft (ADMG).
  
  
  METHODS
  Fifteen bilateral Miller Class I or II gingival recessions (GRs) were selected. The recessions were treated and assigned randomly to the test group (TG), and the contralateral recessions were assigned to the control group (CG). The ADMG was used in both groups with differences in the graft positioning between them. The following clinical parameters were measured before the surgeries and after 12 months: 1) probing depth; 2) relative clinical attachment level; 3) GR; 4) thickness of KT (TKT); and 5) KT width. A new parameter, the GR area (GRA), was measured in standardized photographs using a special device and software.
  
  
  RESULTS
  There was no significant difference between groups in KT width and TKT parameters at the 12-month postoperative period. However, there was a significant difference between the gains in GR (ΔGR) and GRA (ΔGRA), favoring the TG after 12 months. The TG presented ΔGR = 3.04 ± 0.29 mm and ΔGRA= 38,919 ± 9,238 pixel square values (pix(2)), and the CG presented ΔGR= 2.61 ± 0.41 mm and ΔGRA= 22,245 ± 9,334 pix(2) (P <0.05 and <0.001, respectively).
  
  
  CONCLUSIONS
  Both techniques were successful. The TG treatment was more effective in reducing GR and GRA. The flap and graft position may be of importance in root coverage procedures outcome.
authors.affiliation: Department of Periodontology, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
authors.forename: Lauro G
authors.initials: LG
authors.lastname: Ayub
authors.forename: Umberto D
authors.initials: UD
authors.lastname: Ramos
authors.forename: Danilo M
authors.initials: DM
authors.lastname: Reino
authors.forename: Márcio F M
authors.initials: MF
authors.lastname: Grisi
authors.forename: Mário
authors.initials: M
authors.lastname: Taba
authors.forename: Sérgio L S
authors.initials: SL
authors.lastname: Souza
authors.forename: Daniela B
authors.initials: DB
authors.lastname: Palioto
authors.forename: Arthur B
authors.initials: AB
authors.lastname: Novaes
mesh_terms: D062088:Acellular Dermis; D000328:Adult; D064591:Allografts / Q000637:transplantation*; D003238:Connective Tissue / Q000637:transplantation; D005260:Female; D005500:Follow-Up Studies; D005881:Gingiva / Q000473:pathology / Q000637:transplantation; D005889:Gingival Recession / Q000601:surgery*; D005893:Gingivoplasty / Q000379:methods*; D006801:Humans; D007633:Keratins; D008297:Male; D008875:Middle Aged; D017622:Periodontal Attachment Loss / Q000601:surgery; D010514:Periodontal Pocket / Q000601:surgery; D016038:Skin Transplantation / Q000379:methods*; D013524:Surgical Flaps / Q000601:surgery; D014092:Tooth Root / Q000601:surgery*; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D007633:Keratins
keywords: Acellular dermis; allografts; dental; esthetics; gingival recession; randomized controlled trial.