title: Evaluation of wear: enamel opposing three ceramic materials and a gold alloy.
abstract: BACKGROUND
  The wear of human enamel and of the restorative material is often a critical concern when selecting a restorative material for any given clinical restorative treatment.
  
  
  OBJECTIVE
  This in vitro wear investigation evaluated three ceramic restorative materials and one type III gold (the control) opposing enamel.
  
  
  METHODS
  The area of enamel lost at specified time intervals, the stylus area lost, and the combined stylus and enamel vertical height lost were evaluated.
  
  
  RESULTS
  Enamel wear opposing one type III gold was statistically similar to that of Dicor MGC, which was lower than that of Vita Mark II and IPS Empress, which were also statistically similar in value.
  
  
  CONCLUSIONS
  The total vertical height lost from the type III gold specimens and opposing enamel was statistically lower than that of Dicor MGC and IPS Empress (alpha < 0.05).
authors.affiliation: Department of Restorative Denstistry, School of Dentistry, University of Alabama at Birmingham, USA.
authors.forename: M H
authors.initials: MH
authors.lastname: Ramp
authors.forename: S
authors.initials: S
authors.lastname: Suzuki
authors.forename: C F
authors.initials: CF
authors.lastname: Cox
authors.forename: W R
authors.initials: WR
authors.lastname: Lacefield
authors.forename: D L
authors.initials: DL
authors.lastname: Koth
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D000704:Analysis of Variance; D002516:Ceramics / Q000737:chemistry; D017076:Computer-Aided Design; D003734:Dental Casting Investment / Q000737:chemistry; D003743:Dental Enamel / Q000473:pathology*; D003776:Dental Porcelain / Q000737:chemistry; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent; D005069:Evaluation Studies as Topic; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D013314:Stress, Mechanical; D013499:Surface Properties; D014072:Tooth Abrasion / Q000209:etiology* / Q000473:pathology
chemical_list: D000538:Aluminum Silicates; D003734:Dental Casting Investment; C047475:Dicor ceramic; D006047:Gold Alloys; C075815:IPS-Empress ceramic; C082340:Vita Mark II; D003776:Dental Porcelain