title: Teeth with large amalgam restorations and crowns: factors affecting the receipt of subsequent treatment after 10 years.
abstract: BACKGROUND
  The authors evaluated the factors associated with the receipt of subsequent treatment by teeth restored with a large amalgam restoration or a large amalgam restoration and crown restoration after 10 years.
  
  
  METHODS
  The authors used retrospective data from the University of Iowa College of Dentistry (Iowa City, Iowa) administrative database and patient records to evaluate patient and tooth factors for their association with the two primary outcomes: receipt of any subsequent treatment and receipt of catastrophic treatment (extraction, endodontic therapy).
  
  
  RESULTS
  The authors followed 518 teeth over a 10-year period (49 percent with large amalgam restorations and 51 percent with crowns). Sixty-four percent of the large amalgam restorations and 32 percent of the crowns received subsequent treatment during the 10 years. In addition to restoration type, the patient's sex, history of grinding teeth and having a broken tooth were related to the tooth's receiving subsequent treatment. Twenty-two percent of large amalgam restorations and 12 percent of crowns received catastrophic treatment with the odds of teeth with large amalgam restorations receiving a catastrophic treatment being 2.1 times the odds of teeth with crowns receiving catastrophic treatment.
  
  
  CONCLUSIONS
  Teeth with crowns were less likely to receive any treatment or catastrophic treatment over 10 years than were teeth with large amalgam restorations. Patient and tooth factors also were related to a tooth experiencing subsequent treatment.
  
  
  CONCLUSIONS
  Teeth with crowns received less subsequent treatment than teeth with large amalgam restorations. This could be related to both the difference in longevity between the two restorations, as well as how appropriately treatment was planned for each procedure. Cost differences between the two restorations need to be factored into the decision-making process.
authors: Detroit Center for Research on Oral Health Disparities, Department of Cariology, Restorative Sciences and Endodontics, University of Michigan, USA. jkolker@umich.edu
authors: Justine L
authors: JL
authors: Kolker
authors: Peter C
authors: PC
authors: Damiano
authors: Daniel J
authors: DJ
authors: Caplan
authors: Steven R
authors: SR
authors: Armstrong
authors: Deborah V
authors: DV
authors: Dawson
authors: Michael P
authors: MP
authors: Jones
authors: Stephen D
authors: SD
authors: Flach
authors: John J
authors: JJ
authors: Warren
authors: Raymond A
authors: RA
authors: Kuthy
mesh_terms: D000328:Adult; D000368:Aged; D016009:Chi-Square Distribution; D003442:Crowns / Q000706:statistics & numerical data*; D003723:Dental Amalgam; D003793:Dental Restoration, Permanent / Q000379:methods* / Q000706:statistics & numerical data; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D019239:Practice Patterns, Dentists' / Q000706:statistics & numerical data*; D019233:Retreatment / Q000706:statistics & numerical data; D012189:Retrospective Studies; D016896:Treatment Outcome
chemical_list: D003723:Dental Amalgam