title: Factors associated with amalgam restorations in Taiwan.
abstract: OBJECTIVE
  This study investigated the prevalence of and factors associated with amalgam restorations of posterior teeth in Taiwan.
  
  
  METHODS
  The authors analyzed the dental data regarding direct restorations of posterior teeth from the National Health Insurance Research Database of 1997, which was the first nationwide data available. The chi-square test and analysis of variance was used to compare the characteristics of the teeth, patients, dentists, and dental treatment settings between amalgam and composite restorations. The multivariate analysis was applied to obtain the Generalized Estimating Equation estimation for associations of multiple factors with amalgam restorations, taking into account the intra-individual correlation of teeth restored.
  
  
  RESULTS
  Amalgam was used in 53.3% of the direct restorations of posterior teeth. When all the important factors were assessed simultaneously, characteristics significantly associated with more amalgam restorations were: dentists aged 43 years and above, patients aged 1-22 years, primary molars, two- or three-surface cavity, regions with higher number of population served per dentist, and dental clinic.
  
  
  CONCLUSIONS
  Doctors' age, patients' age, type of dental treatment settings, population served per dentist, type of tooth, and number of surfaces restored were significantly associated with amalgam restorations in Taiwan.
authors.affiliation: Institute of Stomatology, Chung Shan Medical University, Taichung, Taiwan. suhwoan@csmu.edu.tw
authors.forename: Suh-Woan
authors.initials: SW
authors.lastname: Hu
authors.forename: Li-Chiu
authors.initials: LC
authors.lastname: Yang
authors.forename: Hsing-Yi
authors.initials: HY
authors.lastname: Chang
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000704:Analysis of Variance; D016208:Databases, Factual; D003723:Dental Amalgam; D003731:Dental Caries / Q000473:pathology; D003740:Dental Clinics / Q000706:statistics & numerical data; D003793:Dental Restoration, Permanent / Q000379:methods* / Q000706:statistics & numerical data*; D003796:Dental Service, Hospital / Q000706:statistics & numerical data; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008963:Molar; D015999:Multivariate Analysis; D013624:Taiwan
chemical_list: D003723:Dental Amalgam