title: The influence of dynamic occlusal interferences on probing depth and attachment level: results of the Study of Health in Pomerania (SHIP).
abstract: BACKGROUND
  The purpose of this study was to investigate potential associations between dynamic occlusal interferences and signs of periodontal disease in posterior teeth based on dental and medical measurements obtained from a population-based sample in the cross-sectional epidemiological study entitled, "Study of Health in Pomerania" (SHIP).
  
  
  METHODS
  Medical history and dental and sociodemographic parameters of 2,980 representatively selected dentate subjects, 20 to 79 years of age, were collected. The analysis was performed on posterior teeth only using a mixed linear model that considers the clustered structure of the data. The model also was adjusted with respect to known risk factors for periodontal disease.
  
  
  RESULTS
  The presence of non-working side contacts only was significantly related to probing depth (P<0.0001) and attachment loss (P=0.001). The presence of non-working side contacts and working side contacts on the same tooth was significantly related to increased probing depth (P=0.004) but not attachment level. The effect magnitude was a mean increase of 0.13 mm for probing depth and 0.14 mm in attachment loss. Known risk factors for periodontal disease that also showed significant associations with probing depth and attachment loss included male gender, age, smoking, education, and plaque score. Other factors significantly related to probing depth and/or attachment loss were tilted teeth, restored occlusal surfaces versus sound surfaces, elongated teeth, and tooth type (molar versus premolar).
  
  
  CONCLUSIONS
  The effect of non-working contacts on periodontal disease status was discernible, but weak in terms of magnitude and specificity.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, University of Greifswald, Greifswald, Germany.
authors.forename: Olaf
authors.initials: O
authors.lastname: Bernhardt
authors.forename: Dietmar
authors.initials: D
authors.lastname: Gesch
authors.forename: John O
authors.initials: JO
authors.lastname: Look
authors.forename: James S
authors.initials: JS
authors.lastname: Hodges
authors.forename: Christian
authors.initials: C
authors.lastname: Schwahn
authors.forename: Florian
authors.initials: F
authors.lastname: Mack
authors.forename: Thomas
authors.initials: T
authors.lastname: Kocher
mesh_terms: D000328:Adult; D000368:Aged; D002012:Bruxism / Q000150:complications; D003430:Cross-Sectional Studies; D003769:Dental Occlusion, Traumatic / Q000150:complications* / Q000453:epidemiology; D003773:Dental Plaque / Q000150:complications; D004522:Educational Status; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D017622:Periodontal Attachment Loss / Q000453:epidemiology / Q000209:etiology*; D010514:Periodontal Pocket / Q000453:epidemiology / Q000209:etiology*; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects; D019217:Tooth Attrition / Q000150:complications