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Creep of dental amalgam
Author(s) -
ESPEVIK S.,
SöRENSEN S. E.
Publication year - 1975
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1975.tb00433.x
Subject(s) - creep , microstructure , amalgam (chemistry) , materials science , volume fraction , elongation , ultimate tensile strength , composite material , phase (matter) , alloy , grain size , volume (thermodynamics) , metallurgy , chemistry , thermodynamics , physics , organic chemistry , electrode
— The steady‐state creep rates of dental amalgams were measured and the creep rates were correlated with the microstructure of the amalgams. The influence of manipulation variables on creep rate and microstructure was evaluated. The samples were either mechanically or hand triturated, hand condensed, and stored at 20°C for 7 d. The specimens were subjected to a constant tensile load for 24 h, and the elongation was measured with a displacement transducer. The smallest creep rate was found on a spherical amalgam, and the highest on an amalgam made from a preamalgamated fine grain alloy. A correlation between microstructure and creep rate could be demonstrated. The amount of γ 2 phase did not seem to influence the creep rate. Amalgams that had large closely packed γ particles surrounded by a small volume fraction of γ 1 phase exhibited a low creep rate. Amalgams that had small broken up γ particles surrounded by a large volume fraction of γ 1 exhibited a high creep rate. Abusive manipulation of lathe‐cut amalgam alloys resulted in high creep rates, small broken up γ particles and a high volume fraction of γ 1 .