title: Changes in health over time in patients with symptoms allegedly caused by their dental restorative materials.
abstract: OBJECTIVE
  In Sweden, many patients with symptoms allegedly caused by their dental materials have exchanged their restorations, but the effects of the exchange have been insufficiently investigated. Therefore, the aim of the study was to describe the change in health over time for these patients and the hypothesis was that the patients could be divided based on their symptoms and that the ability to recover differs between these groups. Furthermore, we also examined if other factors such as replacement of dental restorative materials and follow-up time had any impact on the perceived health status.
  
  
  METHODS
  A questionnaire was sent to 614 patients who had been referred to the School of Dentistry, Umeå, Sweden, with symptoms allegedly caused by dental restorative materials. The response rate was 55%.
  
  
  RESULTS
  The risk of having any further complaints was higher for patients with complex symptoms (P = 0.03) and these patients had exchanged their restorations to a significantly larger extent than the others (P = 0.03). The remaining complaints was more frequent among men (P = 0.02). Exchange of dental restorative materials had no significant impact on the ability to recover completely. However, the patients who had exchanged their restorations completely perceived a significantly larger alleviation of their symptoms than the others (P < 0.01), although the frequency of most of the symptoms had increased.
  
  
  CONCLUSIONS
  Patients with complex symptoms had a more unfavorable long-term prognosis concerning persistent complaints than those with localized symptoms only. Furthermore, the results indicate that the patients might experience health improvements after removal of their dental restorative materials. The reason for this improvement, however, is unclear. Further analyses regarding other possible explanations than the 'odontological/medical' are needed.
authors.affiliation: Dental Materials Science, Department of Odontology, Umeå University, Sweden. anders.tillberg@odont.umu.se
authors.forename: A
authors.initials: A
authors.lastname: Tillberg
authors.forename: A
authors.initials: A
authors.lastname: Berglund
authors.forename: L
authors.initials: L
authors.lastname: Mårell
authors.forename: J
authors.initials: J
authors.lastname: Bergdahl
authors.forename: N
authors.initials: N
authors.lastname: Eriksson
authors.forename: G
authors.initials: G
authors.lastname: Lindén
authors.forename: B
authors.initials: B
authors.lastname: Stenberg
authors.forename: L
authors.initials: L
authors.lastname: Widman
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D003764:Dental Materials / Q000009:adverse effects*; D003793:Dental Restoration, Permanent / Q000009:adverse effects* / Q000523:psychology; D005260:Female; D006304:Health Status; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009059:Mouth Diseases / Q000209:etiology* / Q000523:psychology; D011379:Prognosis; D019233:Retreatment; D012647:Self-Assessment; D013001:Somatoform Disorders / Q000209:etiology* / Q000523:psychology; D011795:Surveys and Questionnaires; D013548:Sweden
chemical_list: D003764:Dental Materials