title: Four-year clinical results of fixed dental prostheses with zirconia substructures (Cercon): end abutments vs. cantilever design.
abstract: The purpose of this prospective study was to evaluate the clinical outcome of three- to four-unit posterior all-ceramic fixed dental prostheses (FDPs) made of yttria-stabilized tetragonal zirconia-polycrystal ceramic frameworks (CerconBase; Degudent). Fifty-eight restorations were placed in 48 patients. Twenty-four FDPs had an end abutment design (EAD) replacing 3 premolars and 21 molars. Thirty-four FDPs had a cantilever design (CD) replacing 11 premolars and 23 molars. The frameworks had a minimum proximal connector dimension of 3 x 3 mm. The fixed dental prostheses were cemented with glass-ionomer cement after air-abrading the inner crown surfaces. Three FDPs were defined as drop-outs. The mean observation period was 48 +/- 7 months for the EAD (21 patients/24 FDPs) and 50 +/- 14 months for the CD (25 patients/31 FDPs). The 4-yr survival rate, according to the Kaplan-Meier analyses, was 96% for the EAD and 92% for the CD. The technical complication rate was 13% for the EAD and 12% for the CD, and the biological complication rate was 21% for the EAD and 15% for the CD. For none of the analyses were significant differences found between both groups. After 4 yr the clinical outcome of three- to four-unit posterior FDPs with EAD and CD was promising.
authors.affiliation: Department of Prosthodontics and Dental Materials, Medical Faculty, RWTH Aachen University, Aachen, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Wolfart
authors.forename: Sönke
authors.initials: S
authors.lastname: Harder
authors.forename: Stefanie
authors.initials: S
authors.lastname: Eschbach
authors.forename: Frank
authors.initials: F
authors.lastname: Lehmann
authors.forename: Matthias
authors.initials: M
authors.lastname: Kern
mesh_terms: D000328:Adult; D000368:Aged; D001641:Bicuspid; D002484:Cementation / Q000379:methods; D003442:Crowns; D000044:Dental Abutments; D018772:Dental Marginal Adaptation; D003776:Dental Porcelain / Q000737:chemistry*; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003801:Dental Veneers; D003779:Denture Design; D003780:Denture Repair; D003781:Denture Retention; D003830:Denture, Partial, Fixed; D005260:Female; D005500:Follow-Up Studies; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008297:Male; D008875:Middle Aged; D008963:Molar; D017060:Patient Satisfaction; D010512:Periodontal Index; D011446:Prospective Studies; D013499:Surface Properties; D016019:Survival Analysis; D016896:Treatment Outcome; D055815:Young Adult; D015019:Yttrium / Q000737:chemistry*; D015040:Zirconium
chemical_list: D005899:Glass Ionomer Cements; C499362:yttria stabilized tetragonal zirconia; D003776:Dental Porcelain; D015019:Yttrium; D015040:Zirconium