title: Resonance frequency analysis assessment of implant stability in labial onlay grafted posterior mandibles: a pilot clinical study.
abstract: OBJECTIVE
  The objectives of this study were (1) to compare the stability, evaluated by means of resonance frequency analysis (RFA), of implants placed posterior mandibles augmented with autogenous bone harvested from the mandibular symphysis with that of implants placed in nongrafted edentulous posterior mandibles and (2) to compare peri-implant marginal bone height changes and implant failure for the 2 groups.
  
  
  METHODS
  Eight patients with thin posterior mandibular ridges (buccolingual crestal width less than 4 mm) underwent labial onlay alveolar grafting with symphyseal bone blocks 4 months prior to placement of 17 implants. Seven nongrafted patients received 18 implants in the edentulous posterior mandible; these patients served as a control group. RFA was performed the day of implant placement (baseline), 1 month postplacement, 4 months postplacement (after prosthesis delivery), and 12 months postloading. Peri-implant bone height changes at a level of 0.01 mm were assessed using periapical radiographs at baseline, the 1-month follow-up, and the 4-month follow-up. Analysis of variance was used to evaluate statistical differences within the groups, and t test was used to make comparisons between groups.
  
  
  RESULTS
  None of the patients presented postoperative complications or implant failure. Mean implant stability quotient (ISQ) was 63.0+/-6.0 to 70.2 +/-3.5 for the grafted group and 64.1+/-4.1 ISQ to 70.1+/-3.9 for the nongrafted group. No significant difference was found in mean ISQ between the grafted and nongrafted groups at baseline, the 1-month follow-up, 4 months postplacement, or 12 months postloading (P = .211, P = .873, P = .925, P = .735, respectively). Mean peri-implant bone loss was 0.16 +/- 0.04 mm mesially and 0.16 +/- 0.05 mm distally.
  
  
  CONCLUSIONS
  RFA revealed no difference in implant stability between mandibular ridges augmented with autologous bone grafts at baseline or after loading.
authors.affiliation: Department of Oral and Maxillofacial Surgery, University of Marmara, Istanbul, Turkey.
authors.forename: Yasar
authors.initials: Y
authors.lastname: Ozkan
authors.forename: Mutlu
authors.initials: M
authors.lastname: Ozcan
authors.forename: Altan
authors.initials: A
authors.lastname: Varol
authors.forename: Burcin
authors.initials: B
authors.lastname: Akoglu
authors.forename: Mert
authors.initials: M
authors.lastname: Ucankale
authors.forename: Selcuk
authors.initials: S
authors.lastname: Basa
mesh_terms: D000328:Adult; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000209:etiology; D000540:Alveolar Ridge Augmentation / Q000379:methods*; D000704:Analysis of Variance; D001641:Bicuspid; D016025:Bone Transplantation / Q000379:methods; D003758:Dental Implantation, Endosseous / Q000009:adverse effects / Q000379:methods*; D015921:Dental Implants / Q000009:adverse effects; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery*; D008875:Middle Aged; D008963:Molar; D010865:Pilot Projects; D011859:Radiography; D014732:Vibration
chemical_list: D015921:Dental Implants