title: Clinical performance of IPS-Empress 2 ceramic crowns inserted by general dental practitioners.
abstract: OBJECTIVE
  The aim of this study was to evaluate the clinical performance of IPS-Empress 2(R) all-ceramic crowns placed by general dental practitioners.
  
  
  METHODS
  Eighty-two IPS-Empress 2 crowns placed in 64 patients (27 females and 37 males) were evaluated. These crowns had been in place for 15.2 to 57.2 months (mean 25.3 months, SD=9.3). Survival analysis was conducted using the Kaplan-Meier method.
  
  
  RESULTS
  Of the 82 crowns 93.9% were rated satisfactory. In terms of the integrity of the restorations, fracture was observed in three crowns and two showed a crack upon transillumination. Five crowns were rated unsatisfactory for color match; one for marginal adaptation; and none for discoloration, secondary caries, or sensitivity.
  
  
  CONCLUSIONS
  IPS-Empress 2(R) is a suitable material to fabricate all-ceramic crowns; when these all-ceramic crowns were inserted by general dental practitioners, they functioned satisfactorily with low failure rates during an observation period ranging between 15.2 to 57.2 months.
authors.affiliation: Department of Restorative Dentistry of the Faculty of Dentistry at Jordan University of Science and Technology in Irbid, Jordan. yasar@just.edu.jo
authors.forename: Yasar F
authors.initials: YF
authors.lastname: Mansour
authors.forename: Mahmoud K
authors.initials: MK
authors.lastname: Al-Omiri
authors.forename: Yousef Saleh
authors.initials: YS
authors.lastname: Khader
authors.forename: Ahed
authors.initials: A
authors.lastname: Al-Wahadni
mesh_terms: D000328:Adult; D001732:Bite Force; D003116:Color; D003442:Crowns; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D005792:General Practice, Dental; D006801:Humans; D018020:Lithium Compounds / Q000737:chemistry*; D008297:Male; D008875:Middle Aged; D013499:Surface Properties; D016019:Survival Analysis; D014172:Transillumination; D016896:Treatment Outcome
chemical_list: C118557:Empress 2; D018020:Lithium Compounds; D003776:Dental Porcelain