Theme 9.

Polymers. Groups of polymers. Composition. Stages of polymerization. Mechanical properties. Requirements to polymers. Use of polymers in dental practice.

1. Materials that are used in prosthodontics divided on:

1. *metal alloys, polymers, ceramic materials, auxiliary materials;

2. polymers, ceramic materials, auxiliary materials;

3. auxiliary materials, polymers, metal alloys;

4. metal alloys and polymers;

5. non-metal mixtures, metal alloys, auxiliary materials;

2. Soft lining will be manufactured in removable denture base. Choose soft polymer from the materials listed below:

1. *PMS

2. Ftorax

3. Redont

4. Etacryl

5. Karbodent

3. Polymer crown can be manufactured of AKR-7 or Sinma-M. Which groups of polymers are they belong to?

1. *Acrylic

2. Polyethylene

3. Polypropylene

4. Epoxy resin

5. Composite polymer

4. What polymer from the listed below can be used for denture base manufacture?

1. *Ftorax

2. Protacryl

3. AKR-7, Sinma-M

4. Etacryl

5. Redont

5. What polymer can be chosen to fabricate acrylic crown for 21 tooth?

1. *AKR-7, Sinma-M

2. Redont

3. Ftorax

4. Etacryl

5. Protacryl

6. What are the most types of polymerization reactions? (Mark 2 answers)

1. *Polyaddition

2. *Polycondensation

3. Polymerization

4. Polysorbtion

5. Polyaglomeration

7. Which statement from the list below is more complete and correct about dental polymer composition?

1. *Fillers, plasticizers, stabilizers, pigments, cross-linking agents, antimicrobial agents, initiators, activators, inhibitors.

2. Fillers, plasticizers, stabilizers, pigments, cross-linking agents, initiators, activators, inhibitors.

3. Fillers, plasticizers, stabilizers, pigments, antimicrobial agents, initiators, activators

4. Fillers, plasticizers, stabilizers, pigments, initiators, antimicrobial agents, activators.

5. Plasticizers, stabilizers, pigments, cross-linking agents, antimicrobial agents initiators, activators, inhibitors.

8. What are the basic spatial structures of polymers?

1 Linear 2 Crossed 3 Branched 4 Cross-linked 5 Spiral

1. *1,3,4

2. 1,2

3. 3,4

4. 1,2,3

5. 2,4,5

9. Which polymer properties mainly determine functional features of denture and its longlife?

1. *Elasticity and impact resistance

2. Water absorbing and elasticity modulus

3. Specific crash viscosity and crash durability

4. Elasticity and water absorbing

5. Heat stability and impact resistance

10. What are the methods of polymer molding?

1. *Compressive molding

2. *Injection molding

3. Light-cure molding

4. A,B

5. A,C

11. A dental technician put flask with acrylic dough into boiling water. Which type of porosity does appear?

1. *Gas

2. Granular

3. Pressing

12. Which stage of acrylic resin is not correct to use?

1 Stringy 2 Wet sand 3 Dough 4 Rubber

1. *2,4

2. 1,2

3. 2,3

4. 3,4

5. 1,4

13. What are the types of elastic polymers?

1. *Silicone, acryl, polyvinyl, polyphosphazene

2. Acryl, silicone, polyvinyl, polycarbonate

3. Silicone, polyvinyl, polyphosphazene

4. Polyphosphazene, acryl, polyvinyl

5. Silicone, polycarborane, polyvinyl, polyphosphazene

14. What feature is NOT disadvantage of elastic base polymers?

1. *Decreasing of adaptation period

2. Porosity, poor polishing

3. Loss of elasticity

4. Poor marginal seal

5. Not easy to work

15. Packing is:

1. *Filling mold with polymer-monomer composition

2. Making gypsum mold

3. Acrylisation

4. Preparation of packing mixture

5. Pressing mold with acrylic dough

16. What is the main ingredient of most base materials?

1. *Polymethylmethacrylate

2. Caoutchouc

3. Dimethylparatholuidin

4. Polycarbonate

5. Nylon

17. The use of polymers:

1. *Denture base, soft liners, impression materials, artificial teeth, substitution of dental hard tissues, individual trays, interim dentures

2. Denture base, soft liners, impression materials, artificial teeth, substitution of dental hard tissues

3. Denture base, soft liners, impression materials, artificial teeth, substitution of dental hard tissues, individual trays

4. Denture base, soft liners, impression materials, individual trays, interim dentures

5. Denture base, soft liners, impression materials, artificial teeth, substitution of dental hard tissues, interim dentures

18. What is a liquid phase of base material composed of?

1. *Monomer, cross-linking agent

2. Copolymer, initiator

3. Activator, cross-linking agent

4. Pigment, activator

5. Plasticizer, monomer

19. What are the main criteria factors of completely fulfilled polymerization reaction of base polymer?

1. *Temperature, pressure, time

2. Time, pressure, humidity

3. Temperature, pressure, humidity

4. Temperature, humidity, light

5. Humidity, light, time

20. What is the purpose of cross-linking agents?

1. *Strengthen of polymer material

2. Increasing of catalyst activeness

3. Decreasing of shrinkage

4. Increasing of elasticity modulus

5. Increasing of resilience