## ← Back to Property of materials

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### 5 Matching questions

1. Elastic modulus
2. ___________represents the ability of a material to sustain a large permanent deformation under a <b>tensile</b> load before it fractures.
3. Stress
4. Three types of stress in dentistry:
5. Shear stress is calculated by dividing the force by the area ________ to the force direction.

a. perpendicular
b. parallel
1. a 1. tensile stress
2. shear stress
3. compressive stress
2. b Force per unit area within a structure subjected to an external force or pressure (See Pressure).
3. c Relative stiffness of a material; ratio of elastic stress to elastic strain
4. d
ductility
5. e b. parallel

brackets for braces is a good example

### 5 Multiple choice questions

1. Plastic deformation occurs when the <b>elastic stress limit (proportional limit)</b> within the prosthesis is exceeded.
2. Ratio of applied force to the actual cross-sectional area; however, for convenience stress is often calculated as the ratio of applied force to the initial cross-sectional area.
3. Compressive <b>stress</b> within a compression test specimen at the point of fracture.

note: compressive stress -Ratio of compressive force to cross-sectional area perpendicular to the axis of applied force.
4. of enamel rod orientation.
5. composites followed by porcelain, PMMA, amalgam and alumina.

### 5 True/False questions

1. Units of Modulus of elasticityGiganewtons per square meter (GN/m²), or gigapascals (<b>GPa</b>)

2. Which is more stronger in tesnion?

a. enamel
b. dentin

b. dentin

dentin → 50 MPa
enamel → 10 MPa

3. Maximum stress that is required to cause fracture is called _________.Ultimate strength

4. From mechanical property point of view, why isn't it a good idea to burnish amalgam, composites, ceramics and nonresin luting agents?Stress and/or strain

5. What does the straight line in the strain-stress curve represent?
the region represents <b>reversible</b> elastic deformation, because the stress remains below the proportional limit.

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