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Stress relaxation of dental amalgam alloys

✍ Scribed by Huget, Eugene F. ;De Simon, Laszlo B. ;Hertert, Robert S.

Publisher: John Wiley and Sons
Year: 1978
Tongue: English
Weight: 276 KB
Volume: 12
Category: Article
ISSN: 0021-9304
DOI: 10.1002/jbm.820120110

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✦ Synopsis

Short-term stress relaxation of four dental amalgam alloys was studied. Test materials included two conventional lathe-cut restoratives, a spherical alloy, and a dispersed phase product. Specimens were 24-hr-old 4 X 8-mm cylinders. The specimens were compressed and held a t constant strain on development of a stress (So) of 28 MN/m2. Subsequent stress relaxation (D,) was recorded for 60 sec. Data were ohtained a t eight nominal temperatures between 0 and 55°C.

Over the experimental temperature range, fractional stress losses a t 60 sec (D,/SO/GO) for specimens made from lathe-cut alloys increased from 10% to 58%. The spherical material and the dispersed phase alloy showed fractional stress losses (Dc/So/6O) ranging from 9% to 47% and 9% to 31%. respectively. It would appear that particle morphology and alloy composition affect stress-relaxation hehavior of dental amalgam. Stress decay patterns enhance significantly the mechanical characterization of amalgam alloys.

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