Marina Amaral1, Regina F Villefort2, Renata Marques Melo3, Gabriel K R Pereira4, Yu Zhang5, Luiz Felipe Valandro6, Marco Antonio Bottino7. 1. Department of Dentistry, Dental Prosthesis, University of Taubate, Taubaté, São Paulo State, Brazil. 2. Post Graduation Program in Restorative Dentistry (Prosthetic Dentistry Unit), School of Dentistry, Sao Paulo State University, São José dos Campos, São Paulo State, Brazil. 3. Post Graduation Program in Restorative Dentistry, School of Dentistry, Sao Paulo State University, São José dos Campos, São Paulo State, Brazil. 4. Post Graduation Program in Dental Sciences, School of Dentistry, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil. 5. Department of Biomaterials and Biomimetics, New York University College of Dentistry, 433 First Avenue, New York, NY, USA. 6. Department of Restorative Dentistry, School of Dentistry, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: lfvalandro@hotmail.com. 7. Department of Dental Materials and Prosthesis, School of Dentistry, Sao Paulo State University, São José dos Campos, São Paulo State, Brazil.
Abstract
OBJECTIVES: To determine the fatigue limits of three-unit monolithic zirconia fixed dental prosthesis (FDPs) before and after grinding of the gingival areas of connectors with diamond burs. MATERIAL AND METHODS: FDPs were milled from pre-sintered blocks of zirconia simulating the absence of the first mandibular molar. Half of the specimens were subjected to grinding, simulating clinical adjustment, and all of them were subjected to glazing procedure. Additional specimens were manufactured for roughness analysis. FDPs were adhesively cemented onto glass-fiber reinforced epoxy resin abutments. Fatigue limits and standard deviations were obtained using a staircase fatigue method (n=20, 100,000 loading cycles/5Hz). The initial test load was 70% of the mean load-to-fracture (n=3) and load increments were 5% of the initial test load for both the control and ground specimens. Data were compared by Student's T-test (α≤0.05). RESULTS: Both the control and ground groups exhibited similar values of load-to-fracture and fatigue limits. Neither the surface treatments nor ageing affected the surface roughness of the specimens. CONCLUSIONS: The damage induced by grinding with fine-grit diamond bur in the gingival area of the connectors did not decrease the fatigue limit of the three-unit monolithic zirconia FDP.
OBJECTIVES: To determine the fatigue limits of three-unit monolithic zirconia fixed dental prosthesis (FDPs) before and after grinding of the gingival areas of connectors with diamond burs. MATERIAL AND METHODS: FDPs were milled from pre-sintered blocks of zirconia simulating the absence of the first mandibular molar. Half of the specimens were subjected to grinding, simulating clinical adjustment, and all of them were subjected to glazing procedure. Additional specimens were manufactured for roughness analysis. FDPs were adhesively cemented onto glass-fiber reinforced epoxy resin abutments. Fatigue limits and standard deviations were obtained using a staircase fatigue method (n=20, 100,000 loading cycles/5Hz). The initial test load was 70% of the mean load-to-fracture (n=3) and load increments were 5% of the initial test load for both the control and ground specimens. Data were compared by Student's T-test (α≤0.05). RESULTS: Both the control and ground groups exhibited similar values of load-to-fracture and fatigue limits. Neither the surface treatments nor ageing affected the surface roughness of the specimens. CONCLUSIONS: The damage induced by grinding with fine-grit diamond bur in the gingival area of the connectors did not decrease the fatigue limit of the three-unit monolithic zirconia FDP.
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