title: Correlation between the Mechanical Properties and Structural Characteristics of Different Fiber Posts Systems.
abstract: The aim of this study was to evaluate the flexural strength and flexural modulus of different fiber-reinforcement composite (FRC) posts and determine the correlation between mechanical properties and structural characteristics. Eleven brands of fiber posts were analyzed (n=10): Exacto Cônico (Angelus), DT Light SL (VDW), RelyX Fiber Post (3M-Espe), Glassix Radiopaque (Nordim), Para Post Fiber White (Coltène), FRC Postec Plus (Ivoclar), Aestheti-Plus Post (Bisco), Superpost Cônico Estriado (Superdont), Superpost Ultrafine (Superdont), Reforpost (Angelus), and White Post DC (FGM). The posts were loaded in three-point bending test to calculate the flexural strength and flexural modulus using a mechanical testing machine (EMIC 2000 DL) at 0.5 mm/min. Data were submitted to one-way ANOVA and Scott-Knot test (p<0.05). The cross-sections of the posts were examined by scanning electron microscopy (SEM). Correlation between the mechanical properties and each of the structural variables was calculated by Pearson's correlation coefficients (p<0.05). The flexural strength values ranged from 493 to 835 MPa and were directly correlated with the fiber/matrix ratio (p=0.011). The flexural modulus ranged from 4500 to 8824 MPa and was inversely correlated with the number of fibers per mm2 of post (p<0.001). It was concluded that the structural characteristics significantly affected the properties of the FRC posts. The structural characteristic and mechanical properties of fiber glass posts are manufacture-dependent. A linear correlation between flexural strength and fiber/matrix ratio, as well as the flexural modulus and the amount of fiber was found.
authors.affiliation: Department of Operative Dentistry and Dental Materials, Dental School, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil.
authors.forename: Veridiana Resende
authors.initials: VR
authors.lastname: Novais
authors.affiliation: Department of Operative Dentistry and Dental Materials, Dental School, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil.
authors.forename: Renata Borges
authors.initials: RB
authors.lastname: Rodrigues
authors.affiliation: Department of Fixed Prosthodontics, Occlusion and Dental Materials, Dental School, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil.
authors.forename: Paulo Cezar
authors.initials: PC
authors.lastname: Simamoto Júnior
authors.affiliation: Department of Dental Materials, Universidade Estadual de Campinas, Piracicaba, SP, Brazil.
authors.forename: Correr-Sobrinho
authors.initials: CS
authors.lastname: Lourenço
authors.affiliation: Department of Operative Dentistry and Dental Materials, Dental School, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil.
authors.forename: Carlos José
authors.initials: CJ
authors.lastname: Soares
mesh_terms: D003764:Dental Materials; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique
chemical_list: D003764:Dental Materials