Properties of Materials

Flashcards summarizing key concepts about the properties of materials relevant to dentistry.

What is dimensional change in materials?

A change in dimensions during the setting as a result of a chemical reaction or cooling.

Why is the linear coefficient of thermal expansion important in clinical dentistry?

It helps to predict how materials will expand or contract with temperature changes, affecting the seal and integrity of restorations.

What is the significance of thermal and electrical properties of restorative materials?

They are important for ensuring the comfort and safety of the patient while preventing damage to tooth structures.

What role does solubility and water sorption play in dental restorative materials?

It affects the longevity and success of restorations by influencing material degradation.

When is wettability important in clinical dentistry?

It's important during material placement to ensure good adhesion and prevent microleakage.

What is the difference between stress and strain?

Stress is the force per unit area, while strain is the deformation per unit length due to applied stress.

What is elastic modulus?

The ratio of stress to strain in the elastic portion of the stress-strain curve, indicating material stiffness.

What are the characteristics of resilience and toughness?

Resilience measures the energy required to deform a material, while toughness measures the energy required to fracture it.

How does hardness relate to dental materials?

Hardness is the resistance to indentation and is important for the wear resistance of restorative materials.

What is the importance of strain-time curves for materials?

They show how strain may increase over time under a constant load, indicating viscoelastic behavior.