title: Association between moderate to severe psoriasis and periodontitis in a Scandinavian population.
abstract: BACKGROUND
  The aim of the present study was to compare the prevalence of periodontitis and alveolar bone loss among individuals with psoriasis and a group of randomly selected controls.
  
  
  METHODS
  Fifty individuals with psoriasis and 121 controls completed a structured questionnaire, and were examined clinically and radiographically. Oral examination included numbers of missing teeth, probing pocket depth (PPD), clinical attachment level (CAL), presence of dental plaque and bleeding on probing, as well as alveolar bone loss from radiographs. Questionnaires requested information on age, gender, education, dental care, smoking habits, general diseases and medicament use. For adjustment for baseline differences between psoriasis individuals and controls the propensity score based on gender, age and education was computed using multivariate logistic regression. A subsample analysis for propensity score matched psoriasis individuals (n = 50) and controls (n = 50) was performed.
  
  
  RESULTS
  When compared with controls, psoriasis individuals had significantly more missing teeth and more sites with plaque and bleeding on probing. The prevalence of moderate and severe periodontitis was significantly higher among psoriasis individuals (24%) compared to healthy controls (10%). Similarly, 36% of psoriasis cases had one or more sites with radiographic bone loss ≥3 mm, compared to 13% of controls. Logistic regression analysis showed that the association between moderate/severe periodontitis and psoriasis remained statistically significant when adjusted for propensity score, but was attenuated when smoking was entered into the model. The association between psoriasis and one or more sites with bone loss ≥3 mm remained statistically significant when adjusted for propensity score and smoking and regularity of dental visits. In the propensity score (age, gender and education) matched sample (n = 100) psoriasis remained significantly associated with moderate/severe periodontitis and radiographic bone loss.
  
  
  CONCLUSIONS
  Within the limits of the present study, periodontitis and radiographic bone loss is more common among patients with moderate/severe psoriasis compared with the general population. This association remained significant after controlling for confounders.
authors.affiliation: Institute of Clinical Dentistry, Faculty of Dentistry, University of Oslo, Oslo, Norway. rasas@odont.uio.no.
authors.forename: Rasa
authors.initials: R
authors.lastname: Skudutyte-Rysstad
authors.forename: Ellen Margrethe
authors.initials: EM
authors.lastname: Slevolden
authors.forename: Bjørn Frode
authors.initials: BF
authors.lastname: Hansen
authors.forename: Leiv
authors.initials: L
authors.lastname: Sandvik
authors.forename: Hans Ragnar
authors.initials: HR
authors.lastname: Preus
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000453:epidemiology; D016022:Case-Control Studies; D002908:Chronic Disease; D003729:Dental Care / Q000706:statistics & numerical data; D003773:Dental Plaque / Q000453:epidemiology; D004522:Educational Status; D005260:Female; D005884:Gingival Hemorrhage / Q000453:epidemiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009664:Norway / Q000453:epidemiology; D009910:Oral Hygiene / Q000706:statistics & numerical data; D017622:Periodontal Attachment Loss / Q000453:epidemiology; D010514:Periodontal Pocket / Q000453:epidemiology; D010518:Periodontitis / Q000453:epidemiology*; D004364:Pharmaceutical Preparations / Q000008:administration & dosage; D015995:Prevalence; D011565:Psoriasis / Q000453:epidemiology*; D012907:Smoking / Q000453:epidemiology; D016388:Tooth Loss / Q000453:epidemiology; D055815:Young Adult
chemical_list: D004364:Pharmaceutical Preparations