title: A randomized controlled clinical trial of feldspathic versus glass-infiltrated alumina all-ceramic crowns: a 3-year follow-up.
abstract: OBJECTIVE
  The aim of this randomized controlled clinical trial was to compare the outcome of feldspathic porcelain (group 1) and glass-infiltrated alumina all-ceramic (group 2) crowns.
  
  
  METHODS
  Patients were recruited based on inclusion/exclusion criteria, and 33 eligible subjects were assigned randomly to one of the two treatment groups. One hundred one crowns were placed predominantly in the anterior portion of the mouth and were cemented using resin cement. A baseline California Dental Association quality evaluation was completed, and Plaque and Gingival Index scores were recorded. Prosthetic and soft tissue scores were recorded for up to 3 years.
  
  
  RESULTS
  Five restorations experienced mechanical failure. Kaplan-Meier analysis showed that the 3-year survival probabilities for group 1 (0.94) and group 2 (0.95) restorations were comparable (P = .484). Plaque and Gingival Index scores for both groups were similar at the 3-year recall (P > .999). Marginal integrity, anatomical form, and color and surface scores were also similar for both groups (P > .05).
  
  
  CONCLUSIONS
  Feldspathic and glass-infiltrated alumina all-ceramic crowns placed predominantly in the anterior portion have comparable biologic and prosthetic outcomes, as well as survival probabilities.
authors.affiliation: Section of Prosthodontics, CosmORAL Oral and Dental Health Polyclinics, Ankara, Turkey. mcehreli@hotmail.com
authors.forename: Murat Cavit
authors.initials: MC
authors.lastname: Cehreli
authors.forename: Ali Murat
authors.initials: AM
authors.lastname: Kokat
authors.forename: Can
authors.initials: C
authors.lastname: Ozpay
authors.forename: Durdu
authors.initials: D
authors.lastname: Karasoy
authors.forename: Kivanc
authors.initials: K
authors.lastname: Akca
mesh_terms: D000328:Adult; D000537:Aluminum Oxide / Q000737:chemistry*; D000538:Aluminum Silicates / Q000737:chemistry*; D002484:Cementation; D002516:Ceramics / Q000737:chemistry*; D003116:Color; D003442:Crowns; D018772:Dental Marginal Adaptation; D003774:Dental Plaque Index; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010512:Periodontal Index; D017680:Potassium Compounds / Q000737:chemistry*; D011336:Probability; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties; D016019:Survival Analysis; D016896:Treatment Outcome
chemical_list: D000538:Aluminum Silicates; D017680:Potassium Compounds; D019279:Resin Cements; D003776:Dental Porcelain; C016447:feldspar; C070870:In-Ceram; C023506:Glass ceramics; D000537:Aluminum Oxide