title: Trigeminal neurosensory changes following acute and chronic paranasal sinusitis.
abstract: OBJECTIVE
  The aim of this study was to document sensory changes in the supraorbital, infraorbital, and mental nerve distributions following acute and chronic maxillary and frontal sinusitis.
  
  
  METHODS
  Seven patients with a total of 14 infected sinuses were included in the study. Neurosensory function was evaluated by measuring the electrical detection threshold for large myelinated nerve fibers and heat detection thresholds for the assessment of the thin unmyelinated nerve fibers. The sensory tests were conducted in the infraorbital, supraorbital, and mental dermatomes. Patient evaluation included clinical examination and computerized tomographic imaging of the sinuses. Sinusitis symptoms of 1 month or less were considered acute, and symptoms that persisted for more than 3 months were considered chronic. Detection thresholds in 8 healthy volunteers served as controls.
  
  
  RESULTS
  Eight acute and 6 chronic sinusitis cases were diagnosed. Acute sinusitis produced bilateral large myelinated fiber hypersensitivity (electrical) relative to healthy controls, with no significant change in the thin unmyelinated nerve fiber detection threshold (thermal). Chronic sinusitis resulted in large myelinated fiber hyposensitivity and thin myelinated fiber bilateral hyposensitivity, as compared to healthy controls.
  
  
  CONCLUSIONS
  This study concurs with previous studies in finding that early inflammatory neuritis can produce large myelinated nerve fiber hypersensitivity, while long-lasting processes, presumably accompanied with early nerve damage, may result in hyposensitivity.
authors.affiliation: Department of Oral Medicine, Faculty of Dentistry, The Hebrew University Hadassah, Jerusalem, Israel.
authors.forename: Rafael
authors.initials: R
authors.lastname: Benoliel
authors.forename: Adi
authors.initials: A
authors.lastname: Biron
authors.forename: Samuel Y P
authors.initials: SY
authors.lastname: Quek
authors.forename: Oded
authors.initials: O
authors.lastname: Nahlieli
authors.forename: Eli
authors.initials: E
authors.lastname: Eliav
mesh_terms: D000208:Acute Disease; D000328:Adult; D000704:Analysis of Variance; D016022:Case-Control Studies; D002680:Chin / Q000294:innervation; D002908:Chronic Disease; D005157:Facial Pain / Q000209:etiology*; D005260:Female; D015522:Frontal Sinusitis / Q000150:complications* / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D015523:Maxillary Sinusitis / Q000150:complications* / Q000000981:diagnostic imaging; D008875:Middle Aged; D009413:Nerve Fibers, Myelinated / Q000502:physiology; D009915:Orbit / Q000294:innervation; D011859:Radiography; D012684:Sensory Thresholds; D018709:Statistics, Nonparametric; D020433:Trigeminal Nerve Diseases / Q000209:etiology*