title: Treatment of intrabony defects after impacted mandibular third molar removal with bioabsorbable and non-resorbable membranes.
abstract: BACKGROUND
  Mandibular second molar (M2) periodontal defects after third molar (M3) removal in high-risk patients are a clinical dilemma for clinicians. This study compares the healing of periodontal intrabony defects at distal surfaces of mandibular M2s using bioabsorbable and non-resorbable membranes.
  
  
  METHODS
  Eleven patients with bilateral probing depths (PDs) ≥6 mm distal to mandibular M2s and intrabony defects ≥3 mm, related to the total impaction of M3s, were treated with M3 extraction and covering of the surgical bone defect with a bioabsorbable collagen barrier on one side and a non-resorbable expanded polytetrafluoroethylene (ePTFE) barrier contralaterally. The PD, clinical attachment level (CAL), M2 mobility, and furcation class probing were evaluated preoperatively and 3, 6, and 9 months postoperatively. Intraoral periapical radiographs were taken immediately preoperatively and 3 and 9 months postoperatively.
  
  
  RESULTS
  Both treatment modalities were successful. At 9 months, the mean PD reduction was 5.2 ± 3.9 mm for bioabsorbable sites and 5.5 ± 3.0 mm for non-resorbable sites; the CAL gain was 5.9 ± 3.3 mm and 5.5 ± 3.4 mm, respectively. The outcome difference between the two sites for PD and CAL did not differ statistically (P >0.05) at any assessment time.
  
  
  CONCLUSIONS
  Bioabsorbable collagen membranes in guided tissue regeneration treatment of intrabony defects distal to the mandibular M2 obtained the same marked PD reductions and CAL gains as non-resorbable ePTFE membranes after M3 extraction.
authors.affiliation: Department of Oral and Dental Sciences, University of Bologna, Bologna, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Corinaldesi
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Lizio
authors.forename: Giovanni
authors.initials: G
authors.lastname: Badiali
authors.forename: Antonio M
authors.initials: AM
authors.lastname: Morselli-Labate
authors.forename: Claudio
authors.initials: C
authors.lastname: Marchetti
mesh_terms: D020341:Absorbable Implants; D000328:Adult; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery*; D000704:Analysis of Variance; D005260:Female; D016557:Guided Tissue Regeneration, Periodontal / Q000295:instrumentation*; D006801:Humans; D008297:Male; D008567:Membranes, Artificial; D008875:Middle Aged; D008964:Molar, Third / Q000601:surgery*; D010512:Periodontal Index; D011138:Polytetrafluoroethylene; D011446:Prospective Studies; D011859:Radiography; D014081:Tooth Extraction / Q000009:adverse effects*; D014095:Tooth, Impacted / Q000601:surgery
chemical_list: D008567:Membranes, Artificial; D011138:Polytetrafluoroethylene