title: Cortical Bone Augmentation Versus Nerve Lateralization for Treatment of Atrophic Posterior Mandible: A Retrospective Study and Review of Literature.
abstract: OBJECTIVE
  We sought to assess implant success/survival/failure rate following cortical autogenous tenting technique (CATT) versus inferior alveolar nerve transposition (IANT) in the posterior mandible.
  
  
  METHODS
  Patients who underwent these two procedures between 2007 and 2011 were analyzed. CATT was performed using lateral ramus block graft and implants were inserted simultaneously or after 4 to 6 months. In IANT, implants were placed simultaneously after nerve transposition with or without mental foramen involvement. Data regarding marginal bone level (MBL), pus discharge (PD), neurosensory dysfunction (NSD), implant mobility, and failure were collected. Success rate was measured based on Pisa Consensus. Independent sample t-test with a significance level of 0.05 was used to compare implant dimensions and MBL changes between the two techniques.
  
  
  RESULTS
  A total of 118 patients with a mean age of 54.85 years were included. The mean follow-up after CATT and IANT was 37.97 and 18.51 months, respectively. The overall survival and success rates of dental implants in the CATT group were 98.73% and 71.52%, respectively. The corresponding values for IANT subjects were 98.74% and 94.56%, respectively. Implant length and diameter in IANT group were significantly longer and wider than implants used after CATT (p value < .001). MBL changes in both techniques were less than 1 mm (p value = .79). Two cases of NSD, seven PD, and two implant failures were found in the CATT group. For IANT patients, seven permanent NSD, two PD, two implant failures, and one mandibular fracture were documented.
  
  
  CONCLUSIONS
  Both techniques had implant survival rates similar to implants placed in unaltered bone. A higher implant success rate, albeit with higher incidence of long-lasting nerve damage, was observed in the IANT group.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.|Dental Research Center, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Arash
authors.initials: A
authors.lastname: Khojasteh
authors.affiliation: Department of Oral and Maxillofacial Surgery, Azad University of Medical Sciences Dental Branch, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Hassani
authors.affiliation: Dental Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Saeed Reza
authors.initials: SR
authors.lastname: Motamedian
authors.affiliation: Tehran, Iran.
authors.forename: Sarang
authors.initials: S
authors.lastname: Saadat
authors.affiliation: Department of Prosthodontics and Dental Research Centre, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Marzieh
authors.initials: M
authors.lastname: Alikhasi
mesh_terms: D000540:Alveolar Ridge Augmentation; D018786:Bone Substitutes; D000071538:Cortical Bone; D003758:Dental Implantation, Endosseous; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D007576:Jaw, Edentulous, Partially / Q000601:surgery; D008297:Male; D008334:Mandible / Q000601:surgery; D008875:Middle Aged; D012189:Retrospective Studies
chemical_list: D018786:Bone Substitutes
keywords: alveolar bone grafting; alveolar bone loss; alveolar ridge augmentation; dental implantation; inferior alveolar nerve transposition; mandibular nerve