title: A short-term clinical evaluation of IPS Empress 2 crowns.
abstract: OBJECTIVE
  The aim of this study was to evaluate the clinical performance of all-ceramic crowns made with the IPS Empress 2 system after an observation period of 12 to 60 months.
  
  
  METHODS
  Seventy-nine IPS Empress 2 crowns were placed in 21 patients. The all-ceramic crowns were evaluated clinically, radiographically, and using clinical photographs. The evaluations took place at baseline (2 days after cementation) and at 6-month intervals for 12 to 60 months. Survival rate of the crowns was determined using Kaplan-Meier statistical analysis.
  
  
  RESULTS
  Based on the US Public Health Service criteria, 95.24% of the crowns were rated satisfactory after a mean follow-up period of 58 months. Fracture was registered in only 1 crown. One endodontically treated tooth failed as a result of fracture at the cervical margin area.
  
  
  CONCLUSIONS
  In this in vivo study, IPS Empress 2 crowns exhibited a satisfactory clinical performance during an observation period ranging from 12 to 60 months.
authors: Department of Prosthetic Dentistry, Dentistry Faculty, Ege University, Izmir, Turkey. sunatoksavul@yahoo.com
authors: Suna
authors: S
authors: Toksavul
authors: Muhittin
authors: M
authors: Toman
mesh_terms: D000293:Adolescent; D000328:Adult; D003116:Color; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns / Q000592:standards; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D005898:Glass / Q000737:chemistry; D006801:Humans; D018020:Lithium Compounds / Q000737:chemistry*; D008297:Male; D008875:Middle Aged; D011176:Post and Core Technique / Q000295:instrumentation; D013499:Surface Properties; D016019:Survival Analysis; D019237:Tooth Cervix / Q000293:injuries; D014082:Tooth Fractures / Q000209:etiology; D019231:Tooth Preparation, Prosthodontic; D019553:Tooth, Nonvital / Q000628:therapy
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C118557:Empress 2; D018020:Lithium Compounds; C009753:fiberglass; D003776:Dental Porcelain