title: Five-year performance of high-copper content amalgam restorations in a multiclinical trial of a posterior composite.
abstract: OBJECTIVE
  This paper reports the 5-year performance of the restorations of the high-copper content dental amalgam alloys included in the worldwide programme of clinical trials of Occlusin, including unique data on wear.
  
  
  METHODS
  The methods employed are common to those previously reported for the multiclinical evaluation of Occlusin. Analysis of the data is limited to simple statistical procedures.
  
  
  RESULTS
  The findings lend support to existing knowledge concerning the favourable performance of restorations of high-copper content dental amalgam alloys, notably in relation to restorations in moderate- to large-sized Class II preparations in permanent molar teeth. Analysis of the data sheds new light on the influences of variables, including type of tooth restored, size and class of restoration and the presence or absence of occlusal contact(s) on performance.
  
  
  CONCLUSIONS
  Conclusions are drawn regarding ways in which protocols for future evaluations of the type reported should be expanded, and, together with suggestions for further work, it is concluded that this paper is a timely reminder of the value of existing dental amalgam alloys.
authors.affiliation: Department of Restorative Dentistry, University Dental Hospital, Manchester, UK.
authors.forename: N H
authors.initials: NH
authors.lastname: Wilson
authors.forename: D G
authors.initials: DG
authors.lastname: Wastell
authors.forename: R D
authors.initials: RD
authors.lastname: Norman
mesh_terms: D000293:Adolescent; D000328:Adult; D001641:Bicuspid; D003188:Composite Resins / Q000737:chemistry; D003300:Copper / Q000032:analysis / Q000737:chemistry; D003722:Dental Alloys / Q000032:analysis / Q000737:chemistry; D003723:Dental Amalgam / Q000032:analysis / Q000737:chemistry; D003737:Dental Cavity Preparation / Q000145:classification; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent; D005260:Female; D005881:Gingiva / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D008963:Molar; D012189:Retrospective Studies; D013499:Surface Properties; D014520:Urethane / Q000737:chemistry
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; C056413:Occlusin; D014520:Urethane; D003300:Copper; D003723:Dental Amalgam