title: Effect of guided tissue regeneration on the outcome of surgical endodontic treatment: a systematic review and meta-analysis.
abstract: BACKGROUND
  The use of guided tissue regeneration (GTR) techniques has been proposed as an adjunct to endodontic surgery in order to promote bone healing. Studies assessing the added benefits of GTR for the outcome of endodontic surgery are significantly variable in their treatment protocols, follow-up periods, and inclusion criteria, thus generating inconsistent and confusing results. The aim of this study was to evaluate the influence of GTR on the outcome of surgical endodontic treatment by means of a systematic review of the literature and meta-analysis.
  
  
  METHODS
  An exhaustive literature search combined with strict inclusion and exclusion criteria was undertaken to identify clinical studies that assessed the added benefit of GTR in endodontic surgery.
  
  
  RESULTS
  A trend of better outcome was found when GTR was used compared to control cases, but the results were not statistically significant. Lesion size, lesion type, and membrane type were identified as factors significantly affecting the outcome of GTR versus control cases. GTR techniques favorably affected the outcome of surgical endodontic treatments in cases of large periapical lesions and through-and-through lesions. A favorable outcome was found when using a resorbable membrane over using a nonresorbable membrane or graft alone.
  
  
  CONCLUSIONS
  GTR techniques may improve the outcome of bone regeneration after surgical endodontic treatments of teeth with certain lesions. Additional large-scale prospective clinical studies are needed to further evaluate possible benefits of GTR techniques in endodontic surgery.
authors.affiliation: Department of Endodontology, Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel. dr.tsesis@gmail.com
authors.forename: Igor
authors.initials: I
authors.lastname: Tsesis
authors.forename: Eyal
authors.initials: E
authors.lastname: Rosen
authors.forename: Aviad
authors.initials: A
authors.lastname: Tamse
authors.forename: Silvio
authors.initials: S
authors.lastname: Taschieri
authors.forename: Massimo
authors.initials: M
authors.lastname: Del Fabbro
mesh_terms: D001047:Apicoectomy; D001861:Bone Regeneration; D003739:Dental Cementum / Q000502:physiology / Q000601:surgery; D016557:Guided Tissue Regeneration, Periodontal; D006801:Humans; D008567:Membranes, Artificial; D010483:Periapical Diseases / Q000601:surgery*; D010486:Periapical Tissue / Q000601:surgery*; D010513:Periodontal Ligament / Q000502:physiology / Q000601:surgery; D016032:Randomized Controlled Trials as Topic; D012038:Regeneration; D019227:Tooth Apex / Q000601:surgery*; D016896:Treatment Outcome
chemical_list: D008567:Membranes, Artificial