title: Clinical performance of bonded amalgam restorations at 42 months.
abstract: BACKGROUND
  Despite a lack of data based on clinical research, many positive characteristics have been attributed to the placement of amalgam restorations with an adhesive resin liner.
  
  
  METHODS
  For 42 months, and authors followed two groups of subjects who had amalgam restorations placed in a previous study. In this double-blind study, these subjects had been randomly assigned to have amalgam restorations placed with an adhesive liner or with a copal varnish placed under all restorations and a bulk base of zinc phosphate cement for deeper lesions. The authors evaluated anatomical form, marginal adaptation, retention and the presence of secondary caries at six, 18, 30 and 42 months.
  
  
  RESULTS
  At 42 months, the authors found that all restorations in both groups still were retained, were free of secondary caries and were rated clinically acceptable. No difference between the groups was found for any category (P > .05; analysis).
  
  
  CONCLUSIONS
  Placement of amalgam restorations with adhesive liners was found to produce results equivalent to that of traditional methods over a 42-month period.
  
  
  CONCLUSIONS
  Practitioners wary of using new methods that have not undergone thorough clinical testing can feel comfortable placing adhesive liners under amalgam restorations.
authors.affiliation: Medical College of Georgia, School of Dentistry, Department of Oral Rehabilitation, Augusta, Ga. 30912-1260, USA.
authors.forename: W D
authors.initials: WD
authors.lastname: Browning
authors.forename: W W
authors.initials: WW
authors.lastname: Johnson
authors.forename: P N
authors.initials: PN
authors.lastname: Gregory
mesh_terms: D016009:Chi-Square Distribution; D003723:Dental Amalgam / Q000627:therapeutic use*; D001840:Dental Bonding / Q000706:statistics & numerical data; D003736:Dental Cavity Lining / Q000379:methods / Q000706:statistics & numerical data; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000145:classification / Q000379:methods* / Q000706:statistics & numerical data; D004311:Double-Blind Method; D005500:Follow-Up Studies; D006801:Humans; D018579:Patient Selection; D013997:Time Factors
chemical_list: D003723:Dental Amalgam