Dental Materials - “Chapter 3: Physical and Mechanical Properties

Dental Materials - “Chapter 3: Physical and Mechanical Properties”
Study online at https://quizlet.com/_gmknj5

1. _________________ - the measure of the resistance of a material to permanent
indention: Hardness
2. _________________ - the ability to resist fracture: Toughness
3. _________________ - LOAD = an internal rxn (within the material) to an applied
(external) force: Stress
4. _________________ - liquids that flow more readily under mechanical force: -
Thixotropic fluids
5. _________________ - the level of stress at which a material fails: Ultimate strength
6. _________________ - amount of time allotted to bring components of a materi-
al: Mixing time
7. _________________ - time permitted to place and manipulate the material in the
mouth: Working time
8. _________________ - time at which the material can no longer be manipulated-
: Initial set time
9. _________________ - time at which the material has reached its ultimate set: Fina
set time
10. Which bonds are chemical bonds? Primary or secondary?: Primary bonds
11. Are primary bonds strong or weak?: Strong
12. What are the 3 types of primary bonds?: - ionic bonds
- covalent bonds
- metallic bonds
13. What type of primary/chemical bonds refers to bonding between oppositely
charged atoms (+/-)?: Ionic bonds
14. What type of bond is used for materials that are usually brittle and poor
electrical conductors?: Ionic bonds
15. What is an example of a dental material with an ionic bond?: Ceramics
16. What type of primary/chemical bonds refer to bonding with shared electrons
between 2 nonmetal atoms?: Covalent bonds
17. What type of bond is used for materials usually having a low melting point?-
: Covalent bond
18. What are examples of dental materials using covalent bonds?: - polymers
- plastics
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