title: Salivary DNA and markers of oxidative stress in patients with chronic periodontitis.
abstract: OBJECTIVE
  Previous observational studies have shown that periodontal status is associated with salivary markers of oxidative damage. A direct comparison of periodontitis patients and controls using a wide palette of salivary markers of oxidative stress is lacking. Characteristics of salivary DNA in periodontitis are unknown. The aim of this study was to compare the salivary markers of oxidative stress and characteristics of salivary DNA between patients with chronic periodontitis and periodontitis-free controls.
  
  
  METHODS
  Saliva was collected from 23 patients with chronic periodontitis and 19 periodontitis-free controls. All participants underwent a clinical periodontal examination. Markers of oxidative and carbonyl stress were measured in saliva. Human and bacterial DNA was quantified, and human DNA integrity was assessed.
  
  
  RESULTS
  Salivary thiobarbituric acid-reacting substances were higher in patients than in controls; at least in men, the difference was significant (p < 0.01). In women, patients had significantly lower salivary antioxidant status (p < 0.001). No quantitative differences were found regarding salivary DNA. Tendencies towards reduced DNA integrity were found in periodontitis patients.
  
  
  CONCLUSIONS
  The results confirmed the association of salivary thiobarbituric acid-reacting substances with periodontitis. Lipid peroxidation in periodontitis seems to be caused by increased production of reactive oxygen species in men and by decreased antioxidant status in women. Whether lower salivary DNA integrity is involved in the pathogenesis of periodontitis remains to be elucidated.
  
  
  CONCLUSIONS
  Salivary thiobarbituric acid-reacting substances are associated with periodontitis at least on a population level. Sex-specific causes of lipid peroxidation might point towards different pathogenic mechanisms.
authors.affiliation: Department of Stomatology and Maxillofacial Surgery, Faculty of Medicine, Comenius University, Bratislava, Slovakia.
authors.forename: Lenka
authors.initials: L
authors.lastname: Baňasová
authors.forename: Natália
authors.initials: N
authors.lastname: Kamodyová
authors.forename: Katarína
authors.initials: K
authors.lastname: Janšáková
authors.forename: Ľubomíra
authors.initials: Ľ
authors.lastname: Tóthová
authors.forename: Peter
authors.initials: P
authors.lastname: Stanko
authors.forename: Ján
authors.initials: J
authors.lastname: Turňa
authors.forename: Peter
authors.initials: P
authors.lastname: Celec
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000032:analysis*; D016022:Case-Control Studies; D002908:Chronic Disease; D004247:DNA / Q000032:analysis*; D005260:Female; D006801:Humans; D008297:Male; D018384:Oxidative Stress; D010518:Periodontitis / Q000378:metabolism*; D012463:Saliva / Q000737:chemistry*
chemical_list: D015415:Biomarkers; D004247:DNA