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Time-temperature behavior for creep of dental amalgam
Journal of Biomedical Materials Research
|March 1, 1980
Summary
Dental amalgam creep is nonlinear and temperature-dependent. Current methods for measuring creep rate using short time intervals may be inaccurate, suggesting a need for revised testing protocols in dental materials science.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Materials
Background:
- Dental amalgam is a widely used restorative material.
- Understanding the long-term mechanical behavior of dental amalgams, particularly creep, is crucial for clinical longevity.
- Previous studies have often assumed linear creep behavior, potentially oversimplifying complex material responses.
Purpose of the Study:
- To investigate the creep behavior of four different dental amalgams over 24 hours.
- To evaluate the influence of temperature on amalgam creep.
- To assess the validity of linear models and short-term measurements for creep rate determination.
Main Methods:
- Utilized a novel mini-specimen creep apparatus for precise measurements.
- Monitored creep deformation of dental amalgam specimens for 24 hours.
- Tested materials under an initial static stress of 34.5 MPa across a temperature range of 0-60°C.
Main Results:
- Creep behavior of dental amalgams was predominantly nonlinear.
- Temperature significantly influenced the observed creep kinetics.
- Calculating creep rate based on short intervals (1 and 4 hours) proved unreliable for most amalgams.
- Observed creep kinetics aligned with nonlinear models of thermally activated dislocation/obstacle interactions.
Conclusions:
- The creep of dental amalgams is a complex, nonlinear process influenced by temperature.
- Linear creep models and short-term measurements are insufficient for accurately characterizing amalgam creep.
- Further research should focus on nonlinear models to better predict the long-term performance of dental amalgams.