title: A comparison of neurosensory alteration and recovery pattern among different types of orthognathic surgeries using the current perception threshold.
abstract: OBJECTIVE
  The objective of this study was to compare postsurgical neurosensory alteration and recovery patterns among different nerve fiber types and orthognathic surgeries by measuring current perception thresholds (CPT).
  
  
  METHODS
  CPTs of 186 patients who underwent various orthognathic surgeries (Le Fort I or II, bilateral sagittal split [BSSRO] or intraoral vertico-sagittal [IVSRO] ramus osteotomy with or without genioplasty) were measured at 2000, 250, and 5 Hz, assessing 3 different nerve fiber types before surgery and at 3, 6, and 12 months after surgery.
  
  
  RESULTS
  CPTs were highest at 3 months postsurgery and gradually returned to presurgical levels until 12 months postsurgery in most cases. CPT at 2000 Hz showed the largest amount of increase. Le Fort I and IVSRO caused less neurosensory alteration compared with Le Fort II and BSSRO, respectively.
  
  
  CONCLUSIONS
  Our data provide nerve recovery patterns following various orthognathic surgeries that may be applied to evaluating the patient's severity and recovery of nerve damage.
authors.affiliation: Orofacial Pain Clinic, Department of Oral Medicine and Oral Diagnosis, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Korea.
authors.forename: Ji Woon
authors.initials: JW
authors.lastname: Park
authors.forename: Pill-Hoon
authors.initials: PH
authors.lastname: Choung
authors.forename: Hong Seop
authors.initials: HS
authors.lastname: Kho
authors.forename: Young Ku
authors.initials: YK
authors.lastname: Kim
authors.forename: Jin Woo
authors.initials: JW
authors.lastname: Chung
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D002680:Chin / Q000601:surgery; D020209:Cranial Nerve Injuries / Q000209:etiology* / Q000503:physiopathology; D004558:Electric Stimulation; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery; D008875:Middle Aged; D009412:Nerve Fibers / Q000502:physiology; D009416:Nerve Regeneration; D009431:Neural Conduction / Q000502:physiology; D009460:Neurologic Examination / Q000295:instrumentation; D009915:Orbit / Q000294:innervation; D056948:Orthognathic Surgical Procedures / Q000009:adverse effects*; D019340:Osteotomy, Le Fort / Q000009:adverse effects*; D012189:Retrospective Studies; D012684:Sensory Thresholds / Q000502:physiology*; D020886:Somatosensory Disorders / Q000209:etiology*; D061221:Trigeminal Nerve Injuries; D055815:Young Adult