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Creep and beta1 formation in dental amalgam
Scandinavian Journal of Dental Research
|September 1, 1978
Summary
Dental amalgam creep and lattice parameters decrease over time, while beta1 phase content increases. These changes in conventional amalgams are most significant within the initial six months of storage at 37°C.
Area of Science:
- Materials Science
- Dental Materials Science
- Biomaterials
Background:
- Dental amalgam is a widely used restorative material.
- Understanding its long-term stability is crucial for clinical success.
- Conventional amalgams undergo phase transformations affecting their properties.
Purpose of the Study:
- To investigate the long-term changes in conventional dental amalgams.
- To quantify alterations in creep, beta1 phase content, and gamma1 lattice parameter.
- To determine the timeline of these property changes.
Main Methods:
- Four conventional dental amalgams were subjected to accelerated aging.
- Samples were stored at a controlled temperature of 37°C for up to 2 years.
- Creep, beta1 phase content, and gamma1 lattice parameter were systematically measured.
Main Results:
- A decrease in creep values and gamma1 lattice parameter was observed over 2 years.
- An increase in beta1 phase content was noted during the same period.
- The most significant alterations occurred within the first 6 months of storage.
Conclusions:
- Conventional dental amalgams exhibit time-dependent property changes.
- The observed changes indicate ongoing microstructural evolution.
- Clinical implications for amalgam longevity and performance should consider these early-stage alterations.