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The effect of custom adaptation and span-diameter ratio on the flexural properties of fiber-reinforced composite posts

2009; Elsevier BV; Volume: 37; Issue: 5 Linguagem: Inglês

10.1016/j.jdent.2009.01.007

1879-176X

Nicola Maria Grande, Gianluca Plotino, Pietro Ioppolo, R. Bedini, Cornelis H. Pameijer, Francesco Somma,

Innovations in Concrete and Construction Materials

To evaluate whether custom modification resulting in an anatomically shaped post and whether the span/diameter ratio (L/D) would affect the mechanical properties of fiber-reinforced composite posts.Preformed glass-fiber posts (Group 1) and modified glass-fiber posts (Group 2) and glass-fiber rods (Groups 3 and 4) (n=20) were loaded to failure in a three-point bending test to determine the maximum load (N), flexural strength (MPa) and flexural modulus (GPa). The span distance tested for Group 3 was 10.0mm, while for Group 4 was 22.0mm. Data were subjected to different statistical analysis with significance levels of P<0.05.The maximum load recorded for Groups 1 and 2 was 72.5+/-5.9N and 73.4+/-6.4N respectively, while for Groups 3 and 4 was 215.3+/-7N and 156.6+/-3.6N respectively. The flexural strength for Groups 1 and 2 was 914.6+/-53.1MPa and 1069.2+/-115.6MPa, while for Groups 3 and 4 was 685.4+/-22.2MPa and 899.6+/-46.1MPa. The flexural modulus recorded for Groups 1 and 2 was 32.6+/-3.2GPa and 33.4+/-2.2GPa respectively, while for Groups 3 and 4 was 13.7+/-0.3GPa and 34.4+/-0.3GPa respectively.The flexural properties of an anatomically custom modified fiber post were not affected by the modification procedure and the span-diameter ratio is an important parameter for the interpretation of flexural strength and flexural modulus values.