5 Written questions
5 Matching questions
- Which of the following has more resistence?
a. Dental porcelain
c. Resin-based composite
e. Alumnia ceramic
- diametral compression test
- which tooth structure has the hgiher <b>propotional limit</b> and <b>modulus of elasticity</b>?
- Flexural strength
- Units of Modulus of elasticity
Force per unit area at the point of fracture of a test specimen subjected to flexural loading.
- b ????
- c Giganewtons per square meter (GN/m²), or gigapascals (<b>GPa</b>)
a test for tensile strength that is only used for materials that exhibit predominantly elastic deformation and little or no plastic deformation (brittle).
5 Multiple choice questions
- Stress and/or strain
- Proportional limit
- a. low impact
The <b>maximum flexibility</b> is defined as the flexural strain that occurs when the material is stressed to its proportional limit.
5 True/False questions
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.
Why is the ultimate tensile strength sometimes less than the maximum stress? → Because of the reduction in area, the force required to increase deformation actually decreases.
average biting force →
Stress = Force / area
stress units - MPa
How does polshing of brittle material help their strength? →
by comparing the <b>area</b> underneath the elastic region.
↑ the area = ↑ resilience
A _______ stress is caused by a load that tends to stretch or elongate a body.
c. shear → a. low impact