title: Fibre retention osseous resective surgery: how deep is the infrabony component of the osseous-resected defects?
abstract: BACKGROUND
  The Aims of this retrospective study were: (i) to describe the applicability of Fibre Retention Osseous Resective Surgery (FibReORS) to infrabony defects with different radiographic depths and (ii) to identify significant anatomical elements associated with the decision of tooth extraction or application of FibReORS in the context of a treatment approach aimed at pocket elimination.
  
  
  METHODS
  Baseline radiographs with detectable infrabony defects were collected from 68 periodontal patients. Selected teeth with radiographic evidence of infrabony defects had probing depths (PD) >4 mm at revaluation following non-surgical periodontal therapy. Teeth were then surgically treated with FibReORS or extracted on the basis of the decision making of an experienced periodontist and in the context of the overall treatment plan. The total root length and the defect depth were quantified for each selected tooth using radiographic reference points.
  
  
  RESULTS
  A total of 324 teeth with infrabony defects were identified. Fifty-three (16%) teeth with a mean radiographic infrabony defect of 8.5+/-1.7 mm (range 6-12 mm) were extracted; 271 (84%) teeth with a mean infrabony defect of 3.0+/-1.4 mm (1-8 mm) were surgically treated, achieving PD < or =3 mm in all sites at 6-month follow-up. Surgically treated teeth showed baseline radiographic infrabony defects < or =4 mm in 86% of the cases. Logistic multilevel modelling indicated that the probability of extraction was influenced by root length (p=0.0230) and by the radiographic defect depth (p=0.0112).
  
  
  CONCLUSIONS
  FibReORS is applicable in the treatment of shallow to moderate bony defects and deeper defects associated with longer roots.
authors.affiliation: gi.carnevale@libero.it
authors.forename: Gianfranco
authors.initials: G
authors.lastname: Carnevale
authors.forename: Francesco
authors.initials: F
authors.lastname: Cairo
authors.forename: Michele
authors.initials: M
authors.lastname: Nieri
authors.forename: Maurizio S
authors.initials: MS
authors.lastname: Tonetti
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008336:Mandibular Diseases / Q000000981:diagnostic imaging / Q000601:surgery; D008439:Maxillary Diseases / Q000000981:diagnostic imaging / Q000601:surgery; D008875:Middle Aged; D019647:Oral Surgical Procedures / Q000379:methods*; D017622:Periodontal Attachment Loss / Q000000981:diagnostic imaging / Q000601:surgery*; D010514:Periodontal Pocket / Q000000981:diagnostic imaging / Q000601:surgery*; D011859:Radiography; D012189:Retrospective Studies; D012737:Sex Factors; D012907:Smoking / Q000009:adverse effects; D014081:Tooth Extraction / Q000706:statistics & numerical data; D014092:Tooth Root / Q000033:anatomy & histology / Q000000981:diagnostic imaging