The flexural properties of endodontic post materials

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The flexural properties of endodontic post materials. / Stewardson, Dominic; Shortall, Adrian; Marquis, Peter; Lumley, Philip.

In: Dental Materials, Vol. 26, No. 8, 01.08.2010, p. 730-736.

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@article{c9447649eaad4531bb3d9695faf995d6,
title = "The flexural properties of endodontic post materials",
abstract = "OBJECTIVES: To measure the flexural strengths and moduli of endodontic post materials and to assess the effect on the calculated flexural properties of varying the diameter/length (D/L) ratio of three-point bend test samples. METHODS: Three-point bend testing of samples of 2mm diameter metal and fiber-reinforced composite (FRC) rods was carried out and the mechanical properties calculated at support widths of 16mm, 32mm and 64mm. Weibull analysis was performed on the strength data. RESULTS: The flexural strengths of all the FRC post materials exceeded the yield strengths of the gold and stainless steel samples; the flexural strengths of two FRC materials were comparable with the yield strength of titanium. Stainless steel recorded the highest flexural modulus while the titanium and the two carbon fiber materials exhibited similar values just exceeding that of gold. The remaining glass fiber materials were of lower modulus within the range of 41-57GPa. Weibull modulus values for the FRC materials ranged from 16.77 to 30.09. Decreasing the L/D ratio produced a marked decrease in flexural modulus for all materials. SIGNIFICANCE: The flexural strengths of FRC endodontic post materials as new generally exceed the yield strengths of metals from which endodontic posts are made. The high Weibull modulus values suggest good clinical reliability of FRC posts. The flexural modulus values of the tested posts were from 2-6 times (FRC) to 4-10 times (metal) that of dentin. Valid measurement of flexural properties of endodontic post materials requires that test samples have appropriate L/D ratios.",
keywords = "Flexural strength, Dentin, Materials testing, Flexural modulus, Dental restoration failure, Metal, Weibull statistics, Endodontic post, Fiber composite, Elasticity",
author = "Dominic Stewardson and Adrian Shortall and Peter Marquis and Philip Lumley",
year = "2010",
month = aug,
day = "1",
doi = "10.1016/j.dental.2010.03.017",
language = "English",
volume = "26",
pages = "730--736",
journal = "Dental Materials",
issn = "0109-5641",
publisher = "Elsevier",
number = "8",

}

RIS

TY - JOUR

T1 - The flexural properties of endodontic post materials

AU - Stewardson, Dominic

AU - Shortall, Adrian

AU - Marquis, Peter

AU - Lumley, Philip

PY - 2010/8/1

Y1 - 2010/8/1

N2 - OBJECTIVES: To measure the flexural strengths and moduli of endodontic post materials and to assess the effect on the calculated flexural properties of varying the diameter/length (D/L) ratio of three-point bend test samples. METHODS: Three-point bend testing of samples of 2mm diameter metal and fiber-reinforced composite (FRC) rods was carried out and the mechanical properties calculated at support widths of 16mm, 32mm and 64mm. Weibull analysis was performed on the strength data. RESULTS: The flexural strengths of all the FRC post materials exceeded the yield strengths of the gold and stainless steel samples; the flexural strengths of two FRC materials were comparable with the yield strength of titanium. Stainless steel recorded the highest flexural modulus while the titanium and the two carbon fiber materials exhibited similar values just exceeding that of gold. The remaining glass fiber materials were of lower modulus within the range of 41-57GPa. Weibull modulus values for the FRC materials ranged from 16.77 to 30.09. Decreasing the L/D ratio produced a marked decrease in flexural modulus for all materials. SIGNIFICANCE: The flexural strengths of FRC endodontic post materials as new generally exceed the yield strengths of metals from which endodontic posts are made. The high Weibull modulus values suggest good clinical reliability of FRC posts. The flexural modulus values of the tested posts were from 2-6 times (FRC) to 4-10 times (metal) that of dentin. Valid measurement of flexural properties of endodontic post materials requires that test samples have appropriate L/D ratios.

AB - OBJECTIVES: To measure the flexural strengths and moduli of endodontic post materials and to assess the effect on the calculated flexural properties of varying the diameter/length (D/L) ratio of three-point bend test samples. METHODS: Three-point bend testing of samples of 2mm diameter metal and fiber-reinforced composite (FRC) rods was carried out and the mechanical properties calculated at support widths of 16mm, 32mm and 64mm. Weibull analysis was performed on the strength data. RESULTS: The flexural strengths of all the FRC post materials exceeded the yield strengths of the gold and stainless steel samples; the flexural strengths of two FRC materials were comparable with the yield strength of titanium. Stainless steel recorded the highest flexural modulus while the titanium and the two carbon fiber materials exhibited similar values just exceeding that of gold. The remaining glass fiber materials were of lower modulus within the range of 41-57GPa. Weibull modulus values for the FRC materials ranged from 16.77 to 30.09. Decreasing the L/D ratio produced a marked decrease in flexural modulus for all materials. SIGNIFICANCE: The flexural strengths of FRC endodontic post materials as new generally exceed the yield strengths of metals from which endodontic posts are made. The high Weibull modulus values suggest good clinical reliability of FRC posts. The flexural modulus values of the tested posts were from 2-6 times (FRC) to 4-10 times (metal) that of dentin. Valid measurement of flexural properties of endodontic post materials requires that test samples have appropriate L/D ratios.

KW - Flexural strength

KW - Dentin

KW - Materials testing

KW - Flexural modulus

KW - Dental restoration failure

KW - Metal

KW - Weibull statistics

KW - Endodontic post

KW - Fiber composite

KW - Elasticity

U2 - 10.1016/j.dental.2010.03.017

DO - 10.1016/j.dental.2010.03.017

M3 - Article

C2 - 20413150

VL - 26

SP - 730

EP - 736

JO - Dental Materials

JF - Dental Materials

SN - 0109-5641

IS - 8

ER -