Effect of heat treatment on structure and properties of dispersed-type dental amalgam

Chien Ping Ju, Yu Hsuan Chen, Wen Fu Ho, Shu Ching Ho, Wen Cheng Chen, Dar Bin Shieh, Jiin Huey Chern Lin

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Effect of heat treatment of Ag-Cu-Pd dispersant particles on the structure, mechanical properties and mercury vapor release rate of an Ag-Cu-Sn/Ag-Cu-Pd- based dental amalgam has been investigated. Experimental results indicate that crystallinity of dispersant Ag-Cu-Pd alloy increases with increasing HTT, with most notable increase occurring between 100 and 200°C. Increasing HTT of Ag-Cu-Pd alloy does not change much of the mercury/alloy ratio for amalgamation, but largely reduces working/setting time of the amalgam. The Ag-Cu-Pd particles in 7 d-aged amalgam are comprised primarily of an outer Sn/Cu/Pd-rich zone and an inner Ag/Cu/Pd-rich zone with eutectic-type morphology and chemical distribution. The annealing-enhanced Pd segregation effect is most significantly observed in the amalgam derived from 300°C-annealed Ag-Cu-Pd dispersant. This amalgam also has the highest compressive strength, highest DTS, and lowest creep rate. Higher annealing temperature causes mechanical property of the amalgam to deteriorate. The initial mercury vapor release rates of amalgams derived from 100, 200 and 300°C-annealed Ag-Cu-Pd dispersant are significantly lower than that derived from 400°C-annealed dispersant.

Original languageEnglish
Pages (from-to)83-93
Number of pages11
JournalJournal of Materials Science: Materials in Medicine
Issue number1
Publication statusPublished - 2008 Jan

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Bioengineering
  • Biomaterials
  • Biomedical Engineering


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