Viscoelastic behavior of dental amalgam:

Oglesby, Philip L; Davenport, R D; Rodriquez, M S

doi:10.6028/nbs.rpt.8552

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…In fact, we used equation 5, which is equivalent to equation 4, for the evaluation of the experimental data: or b <a + or, (5) where b is given by…”

Section: Resultsmentioning

confidence: 99%

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On the Static Creep of Dental Amalgam

Vrijhoef

Driessens

1974

J Dent Res

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“…In fact, we used equation 5, which is equivalent to equation 4, for the evaluation of the experimental data: or b <a + or, (5) where b is given by…”

Section: Resultsmentioning

confidence: 99%

“…[5][6][7] No differences could be detected between the mean values of the activation energies of the six amalgams; the overall mean was 108.5 kJ/K mole. The value of U = 108 6 kJ/K mole, found from a replot of the measurements of Dickson, Oglesby, and Davenport,6 is consistent with our experiments.…”

Section: Discussionmentioning

confidence: 99%

On the Static Creep of Dental Amalgam

Vrijhoef

Driessens

1974

J Dent Res

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“…The first thorough description of the viscoelastic behavior of amalgam was made by Oglesby et al (1968), who studied creep of a conventional amalgam in the tensile stress range from 3 to 78 MPa. They showed that amalgam exhibits retarded elastic strain (transient creep) and viscous strain (steadystate creep) as well as instantaneous elastic strain.…”

Section: Introductionmentioning

confidence: 99%

Creep of Amalgam at Low Stresses

1987

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The creep and recovery of dental amalgam were studied with a torsional creep apparatus. The purpose was to investigate viscoelastic behavior in a low stress range that might result from normal chewing forces. The creep of specimens up to six months old was also studied. Four types of alloys for amalgam were used: two single-composition sphericals (SCS), an admixture-lathe-cut eutectic (ALE), and a conventional (CON). Constant torque was applied to dumbbell-shaped specimens for three hr and, after the stress was released, recovery was followed for 50 hr. All measurements were made in water at 37 degrees C after storage of the specimens for one week in 37 degrees C water. Creep was also measured at nine intervals on specimens aged from three hr to six months. The SCS amalgams exhibited the least amount of creep, followed by the ALE amalgam. The CON amalgam had the highest creep. The SCS amalgams approached linear viscoelastic behavior in the shear stress range of 0.78-4.10 MPa at 37 degrees C. They did not exhibit steady-state (viscous) creep at stresses less than 4.10 MPa. Recovery was complete but proceeded more slowly than creep. The ALE and CON amalgams exhibited viscous creep at 1.23 MPa and higher. The steady-state creep rate depended on stress, and the stress exponent ranged from 2.3-3.5. All except the ALE amalgam showed essentially constant creep compliance when aged up to six months, once the amalgamation reaction was completed after 24 to 48 hr. The compliance of the ALE amalgam gradually decreased over the six-month period.

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Viscoelastic behavior of dental amalgam:

Cited by 2 publications

References 3 publications

On the Static Creep of Dental Amalgam

On the Static Creep of Dental Amalgam

Creep of Amalgam at Low Stresses

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