title: Direct immunofluorescence in oral lichen planus and oral lichenoid reactions.
abstract: OBJECTIVE
  To aid in differentiation of the two lesions, direct immunofluorescence was used to examine the fluorescence patterns in oral lichen planus and oral lichenoid reactions and to compare the degree of intensity of their fluorescence.
  
  
  METHODS
  Thirty patients participated in this study. Oral mucosal biopsy specimens were obtained from the edge of fresh lesions and were hemisected. One of the sections was placed in 10% neutral buffered formalin for standard light microscopic examination and the other was washed in phosphate-buffered saline and transferred to Michel's transport media for direct immunofluorescence examination.
  
  
  RESULTS
  Fibrinogen was deposited in specimens from 14 of 15 patients diagnosed with oral lichen planus; lesions showed an intense positive fluorescence that outlined the basement membrane zone. Eight of 10 sections from oral lichenoid reactions exhibited fibrinogen deposition along the basement membrane zone; the specimens showed a less intense, homogeneous linear fluorescence. Specimens from five control samples showed no fluorescence.
  
  
  CONCLUSIONS
  Fibrinogen was deposited at the basement membrane zone in both oral lichen planus and suspected oral lichenoid reactions, but the fluorescence was less intense in the oral lichenoid lesions.
authors.affiliation: Department of Oral Pathology and Microbiology, College of Dental Surgery, Manipal, Karnataka, India. aparnaraghu@eudoramail.com
authors.forename: Anekal R
authors.initials: AR
authors.lastname: Raghu
authors.forename: N Rao
authors.initials: NR
authors.lastname: Nirmala
authors.forename: Nair
authors.initials: N
authors.lastname: Sreekumaran
mesh_terms: D000328:Adult; D001485:Basement Membrane / Q000737:chemistry; D003937:Diagnosis, Differential; D005260:Female; D005340:Fibrinogen / Q000032:analysis; D019085:Fluorescent Antibody Technique, Direct; D006801:Humans; D017676:Lichen Planus, Oral / Q000175:diagnosis*; D017512:Lichenoid Eruptions / Q000175:diagnosis; D008297:Male; D008875:Middle Aged
chemical_list: D005340:Fibrinogen