title: Effect of time at 37 degrees C on the creep and metallurgical characteristics of amalgam.
abstract: When aged at 37 degrees C for six months, dental amalgam exhibits a marked decrease in the property of creep. The objective of this study was to investigate the relationship between this decrease in creep and selected metallurgical characteristics. The formation of beta 1 (Ag-Hg), the grain size of gamma 1 (Ag-Hg), and the composition of gamma 1 were chosen for investigation. Creep was determined according to ADA Specification test No. 1, beta 1 was measured by x-ray diffraction, and gamma 1 grain size and gamma 1 composition were determined by electron-probe microanalysis. The results showed that the decrease in creep was related to beta 1 formation and not to changes in either gamma 1 grain size or gamma 1 composition.
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003723:Dental Amalgam / Q000032:analysis; D004577:Electron Probe Microanalysis; D006358:Hot Temperature; D008422:Materials Testing; D008628:Mercury / Q000032:analysis; D008669:Metallurgy; D010316:Particle Size; D012834:Silver / Q000032:analysis; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D012834:Silver; D003723:Dental Amalgam; D008628:Mercury