Outstanding clinical performance of dental amalgam restoration is related to its
**Core Concept**
Dental amalgam is a popular restorative material used for filling teeth, particularly in posterior teeth. Its outstanding clinical performance is attributed to its unique properties, which allow it to withstand the stresses and strains of mastication.
**Why the Correct Answer is Right**
The compressive strength of dental amalgam is its most notable property, with values ranging from 200 to 400 MPa. This high compressive strength enables dental amalgam to withstand the forces of chewing and biting, making it an ideal material for restoring teeth that are subjected to heavy occlusal loads. The compressive strength of dental amalgam is also greater than its tensile strength, which is typically around 15-20 MPa. This difference in strength is due to the material's microstructure, which consists of a matrix of mercury and a dispersion of silver-tin particles.
**Why Each Wrong Option is Incorrect**
**Option B:** Tensile strength is lower than compressive strength in dental amalgam, making it less suitable for withstanding the stresses of mastication.
**Option C:** Corrosion is a potential drawback of dental amalgam, as it can lead to the release of mercury ions and compromise the restoration's integrity. However, corrosion is not a factor that contributes to its outstanding clinical performance.
**Option D:** Creep is the gradual deformation of a material under constant stress, which can be a concern for dental amalgam. However, the compressive strength of dental amalgam is not directly related to its creep resistance.
**Clinical Pearl / High-Yield Fact**
Dental amalgam's compressive strength is significantly higher than its tensile strength, making it essential to use it in areas where compressive forces are dominant, such as in posterior teeth. This knowledge can help clinicians choose the most suitable restorative material for their patients.
**✓ Correct Answer: A. Compressive strength**