title: Resistance against bacterial leakage of four luting agents used for cementation of complete cast crowns.
abstract: OBJECTIVE
  To assess the sealing properties of four luting materials used for cementation of full cast crowns.
  
  
  METHODS
  40 human premolars were prepared with a chamfer finish line. Stone dies were fabricated and copings were waxed, invested and cast in gold. Ten samples (n = 10) were randomly assigned to four groups. In two groups, resin modified glass-ionomer cements were used, ACTIVA BioACTIVE-CEMENT/BASE/LINER and FujiCem2; the third group received the self-adhesive resin cement Embrace WetBond, while the fourth group served as control with a zinc phosphate cement. After cementation, excess cement was removed followed by bench-set for 10 minutes. All samples were stored in water at 37 degrees C and subjected to thermal cycling (x2000 between 5 and 55 degrees C). Subsequently the occlusal surface was reduced exposing the dentin. After sterilization the specimens were subjected to bacterial microleakage with E. faecalis in a dual chamber apparatus for a period of 60 days. Bacterial leakage was checked daily. Data were analyzed using the Kaplan-Meyer survival test. Significant pairwise differences were analyzed using the Log Rank test and the Fishers' exact test at P < 0.05.
  
  
  RESULTS
  ACTIVA BioACTIVE-CEMENT/BASE/LINER, FujiCem2 and Embrace WetBond showed the lowest microleakage scores and differed statistically significantly (P < 0.05) from zinc phosphate cement.
authors.forename: Osvaldo
authors.initials: O
authors.lastname: Zmener
authors.forename: Cornelis H
authors.initials: CH
authors.lastname: Pameijer
authors.forename: Sandra
authors.initials: S
authors.lastname: Hernández
mesh_terms: D002484:Cementation / Q000379:methods*; D003442:Crowns; D001840:Dental Bonding / Q000379:methods*; D003734:Dental Casting Investment / Q000737:chemistry; D003735:Dental Casting Technique; D003738:Dental Cements / Q000737:chemistry*; D003763:Dental Leakage / Q000145:classification / Q000382:microbiology*; D003804:Dentin / Q000382:microbiology; D013293:Enterococcus faecalis / Q000302:isolation & purification; D005899:Glass Ionomer Cements / Q000737:chemistry; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D010895:Pit and Fissure Sealants / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D013696:Temperature; D013997:Time Factors; D019231:Tooth Preparation, Prosthodontic / Q000379:methods; D014520:Urethane / Q000031:analogs & derivatives / Q000737:chemistry; D014867:Water / Q000737:chemistry; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D003734:Dental Casting Investment; D003738:Dental Cements; C586521:Embrace WetBond; C542393:FujiCEM; D005899:Glass Ionomer Cements; D006047:Gold Alloys; D008689:Methacrylates; D010895:Pit and Fissure Sealants; D019279:Resin Cements; C528099:diurethane dimethacrylate; D014867:Water; D014520:Urethane; D015036:Zinc Phosphate Cement