title: A prospective evaluation of zirconia anterior partial fixed dental prostheses: Clinical results after seven years.
abstract: BACKGROUND
  Because of the high mechanical strength of zirconium dioxide, the metal in fixed partial prostheses can now be replaced. However, the material is susceptible to aging or hydrothermal degradation and to chipping of the feldspathic veneer.
  
  
  OBJECTIVE
  The purpose of this prospective study was to evaluate the survival (without failure) and success (survival without any complication or failure) rate and clinical efficacy of anterior zirconia partial fixed dental prostheses.
  
  
  METHODS
  Twenty-seven anterior partial fixed dental prostheses of 3 to 6 units were fabricated. All participants were examined after 1 month and 6 months, then annually for 7 years.
  
  
  RESULTS
  Three partial fixed dental prostheses failed and had to be removed: 2 because of secondary caries, which increased failure significantly (P=.001) and 1 because of severe chipping. Six partial fixed dental prostheses had complications: 2 debonded, 3 had chipping, and 1 had periapical pathology. All veneer porcelain fractures occurred in 6-unit fixed partial prostheses (P=.002). The clinical success rate was 88.8% after the 7-year follow-up.
  
  
  CONCLUSIONS
  The clinical behavior of partial fixed dental prostheses with a zirconium dioxide core in the anterior region provides an adequate medium-term survival rate. The main cause of failure was secondary caries. The most frequent complication was chipping, which was directly related to the number of units of the prosthesis.
authors: Adjunct Lecturer, Department of Buccofacial Prosthetics, Faculty of Medicine and Dentistry, University of Valencia, Valencia, Spain. Electronic address: m.fernanda.sola@uv.es.
authors: Maria Fernanda
authors: MF
authors: Solá-Ruíz
authors: Associate Lecturer, Department of Buccofacial Prosthetics, Faculty of Medicine and Dentistry, University of Valencia, Valencia, Spain.
authors: Rubén
authors: R
authors: Agustin-Panadero
authors: Senior Lecturer, Department of Buccofacial Prosthetics, Faculty of Medicine and Dentistry, University of Valencia, Valencia, Spain.
authors: Antonio
authors: A
authors: Fons-Font
authors: Senior Lecturer, Department of Buccofacial Prosthetics, Faculty of Medicine and Dentistry, University of Valencia, Valencia, Spain.
authors: Carlos
authors: C
authors: Labaig-Rueda
mesh_terms: D000328:Adult; D000368:Aged; D017076:Computer-Aided Design; D003731:Dental Caries / Q000209:etiology; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry; D019232:Dental Restoration Failure; D003801:Dental Veneers; D003779:Denture Design; D003781:Denture Retention; D003830:Denture, Partial, Fixed; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010483:Periapical Diseases / Q000209:etiology; D011446:Prospective Studies; D012008:Recurrence; D013499:Surface Properties; D016019:Survival Analysis; D016896:Treatment Outcome; D015040:Zirconium / Q000737:chemistry*
chemical_list: D003764:Dental Materials; D003776:Dental Porcelain; D015040:Zirconium; C028541:zirconium oxide