Exam (elaborations)
Chapter 17. Polymers for Prosthetic Dentistry
- Course
- Dental materials
- Institution
- Dental Assisting School
Chapter 17. Polymers for Prosthetic Dentistry
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Chapter 17: Polymers for Prosthetic Dentistry1. A polymer is formed by
a. breaking down chains of complex high molecular weight
molecules by heating them
b mixing polysulfide and polyether
c. Joining monomer molecues together in long chain through
carbon bonds
d. fusing acrylic powder beads together at high temperature: c.
Joining monomer molecues together in long chain through carbon
bonds
2. Cross-linking of polymers
a. Is used to improve the physical and mechanical properties of
the final resin product
b. occurs when long chain polymers are mixed together and the
chains physically wrap around each other
c. usually results in a weak material as the degree of cross
linking increases
, d. occurs when long chains link end to end: a. Is used to improve
the physical and mechanical properties of the final resin product
3. Addition polymerization
a. results in porosity in the final material
b. is the least common method of polymerization used in
dentistry
c. produces numerous by products such as alcohol and
acetone
d. Is initiated by a free radical: d. Is initiated by a free radical
4. The physical stages of the addition polymerization
reaction are
a. sandy, stringy, dough, and rubber
b. wet, flexible, and stiff
c. sol, gel and solid
d. Initial , thermal , and terminal: d. Initial , thermal , and terminal
5. A heat-processed denture differs from a chemical -cured
denture , This not true for the heat-processed denture a. it is
stronger
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