title: Effect of ceramic infrastructure on the failure behavior and stress distribution of fixed partial dentures.
abstract: OBJECTIVE
  The effect of the ceramic infrastructure (IS) on the failure behavior and stress distribution of fixed partial dentures (FPDs) was evaluated.
  
  
  METHODS
  Twenty FPDs with a connector cross-section of 16 mm(2) were produced for each IS and veneered with porcelain: (YZ) Vita In-Ceram YZ/Vita VM9 porcelain; (IZ) Vita In-Ceram Zirconia/Vita VM7 porcelain; (AL) Vita In-Ceram AL/Vita VM7 porcelain. Two experimental conditions were evaluated (n = 10). For control specimens, load was applied in the center of the pontic at 0.5 mm/min until failure, using a universal testing machine, in 37°C deionized water. For mechanical cycling (MC) specimens, FPDs were subjected to MC (2 Hz, 140 N, 10(6) cycles) and subsequently tested as described for the control group. For YZ, an extra group of 10 FPDs were built with a connector cross-section of 9 mm(2) and tested until failure. Fractography and FEA were performed. Data were analyzed by ANOVA and Tukey's test (α = 0.05).
  
  
  RESULTS
  YZ16 showed the greatest fracture load mean value, followed by YZ16-MC. Specimens from groups YZ9, IZ16, IZ16-MC, AL16 and AL16-MC showed no significant difference for the fracture load.
  
  
  CONCLUSIONS
  The failure behavior and stress distribution of FPDs was influenced by the type of IS. AL and IZ FPDs showed similar fracture load values but different failure modes and stress distribution. YZ showed the best mechanical behavior and may be considered the material of choice to produce posterior FPDs as it was possible to obtain a good mechanical performance even with a smaller connector dimension (9 mm(2)).
authors: Post-graduate Program in Dentistry, Dental School, University of Passo Fundo, Passo Fundo, RS, Brazil. Electronic address: marcia_borb@hotmail.com.
authors: Márcia
authors: M
authors: Borba
authors: Department of Biomedical Materials Science, University of Mississippi Medical Center, Jackson, MS, USA.
authors: Yuanyuan
authors: Y
authors: Duan
authors: Department of Biomedical Materials Science, University of Mississippi Medical Center, Jackson, MS, USA.
authors: Jason A
authors: JA
authors: Griggs
authors: Department of Biomaterials and Oral Biology, University of Sao Paulo, Sao Paulo, SP, Brazil.
authors: Paulo F
authors: PF
authors: Cesar
authors: Post-graduate Program in Dentistry, Dental School, University of Passo Fundo, Passo Fundo, RS, Brazil.
authors: Álvaro
authors: Á
authors: Della Bona
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D003779:Denture Design; D003830:Denture, Partial, Fixed; D020342:Finite Element Analysis; D008422:Materials Testing; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry
chemical_list: C485633:In-Ceram Zirconia; D016876:Metal Ceramic Alloys; D003776:Dental Porcelain; C070870:In-Ceram; D015019:Yttrium; D000537:Aluminum Oxide; C091417:yttria
keywords: Ceramics; Dental restoration failure; Finite element analysis
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