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Creep of Amalgam

Creep is a measure of the viscoelastic properties of a material. In the dynamic creep method, a compressive load is applied to a specimen to produce a fluctuating stress which is cycled from 500 to 10,000 psi (34.5 to 69.0 MPa) at a rate of 1800 times per minute. In the static creep method, a constant compressive stress of 5250 psi (36.2 MPa) is applied to the specimen. In the American National Standards Institute/American Dental Association's flow method (ref. 73), the specimen is subjected to a compressive stress of 1450 psi (10.0 MPa). In each method the change in length of the specimen is measured and divided by the original length.

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                                Dynamic    Static     ADA
                                 creep     creep      flow
Material        Product           (%)       (%)       (%)    Ref.
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Amalgam
  Admixed      Dispersalloy        0.86      0.76      0.50    53
                                             0.67             214
                                             0.3              143
               Dispersalloy
                 fast set                    0.41*            142
                                             0.32#            142
                 regular set                 0.46*            142
                                             0.37#            142
                 non zinc                    1.01             214
               Optaloy II                    1.77             214
                                             1.47*            142
                                             1.08#            142
               Valiant PhD                   0.21             171
  Lathe-cut    ANA 68 Dental
                 Alloy                       2.1              143
               ANA 2000
                 Nongamma 2                  0.15             143
               Aristoloy                     3.77             214
               Caulk Fine Cut                1.56*            142
                                             1.57#            142
               New True Dentalloy  1.85      2.36      0.65    53
                                             1.53             214
               Revalloy                      1.2              143
               20th Century Micro  8.76      8.37      3.91    53
  Spherical    Cupralloy Esp                 0.37*            142
                                             0.25#            142
               Indiloy                       0.34*            142
                                             0.15#            142
               Sybraloy                      0.10             214
                                             0.10*            142
                                             0.05#            142
               Tytin                         0.20             171
                                             0.08             214
               Valiant                       0.06             171
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* Hand Triturated
# Mechanically Triturated

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Introduction to Biomaterials Properties | Biomaterials Properties Table Listing |
References (1-100) | References (101-200) | References (201-244) |

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Revised April, 1996
Biomaterials Properties Database, University of Michigan
Contact: Dr William J. O'Brien, Director (FAX: 313-647-5293).
Copyright © Quintessence Publishing, 1996.

http://www.lib.umich.edu/dentlib/Dental_tables/Creep.html

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