1. *Sodium hypochlorite

2. *Iodophors

3. Dezoxon

4. Glutarex

5. Glutaraldehyde

Theme 8 Pattern materials. Requirements to them. Waxes. Composition and mechanical properties. Manipulation.

Q1. Dental technician is going to pattern crown of 21 tooth. Gypsum cast of this tooth has defect. Choose the wax what is necessary for wax pattern of 21 tooth.

А. *pattern

В. casting

С. base wax

D. processing

E. sticky

Q2. Choose the wax for pattern of denture base of partial removable denture.

1. *Base

2. Pattern

3. Processing

4. Sticky

5. Casting

Q3. Wax pattern of tooth crown is recommended to be performed with carnauba wax. What is the group of this wax?

1. *Plant waxes

2. Mineral waxes

3. Natural waxes

4. Animal waxes

5. Synthetic waxes

Q4. What is the origin of waxes?

1. *Animal, synthetic, plant, insect

2. Animal, plant, synthetic

3. Plant, insect, marine, animal

4. Marine, animal, synthetic, plant

5. Insect, synthetic, marine, plant

Q5. Full metal swaged crown for 16 is being made. Step of wax pattern. Occlusal surface of 16 is ruined by caries. Technician should restore it. What he can use to check it?

1. *Relation with antagonists

2. Occlusal surface of 17

3. Occlusal surface of 26

4. Occlusal surface of 46

5. Relation with neighboring teeth

Q6. While wax patterning of 24 wax fell to cervical line. What will happen due to this mistake?

1. *There are no marginal fit

2. Crown is not possible to put on tooth

3. Crown is higher than necessary

4. Crown is out of contact with antagonist

5. Crown is too short

Q7. Dental waxes are classified according to their applications into:

1. *Base, casting, pattern, processing, sticky

2. Casting, pattern, processing, adhesive

3. Pattern, processing, sticky, base, adhesive

4. Base, casting, pattern, adhesive

Q8. Dental waxes include ingredients:

1. *Natural waxes, synthetic waxes, natural resins, oils, fats, coloring agents

2. Alkali, synthetic waxes, fats, coloring agents, natural resins

3. Natural waxes, synthetic waxes, oils, alkali

4. Fats, coloring agents, natural resins, synthetic waxes

Q9. Base wax is used for:

1. *denture bases, occlusal rims, orthodontic apparatuses, custom trays

2. inlays, intermediate part of bridges, occlusal rims

3. intermediate part of bridges, orthodontic apparatuses, denture bases

4. custom trays, denture bases, intermediate part of bridges

5. intermediate part of bridges, orthodontic apparatuses, custom trays

Q10. The differences of casting waxes from base waxes are:

1. *high ductility, low temperature shrinkage

2. low ductility, low temperature shrinkage

3. high ductility, high temperature shrinkage

4. low ductility, high temperature shrinkage

Q11. Pattern wax is used for modeling:

1. *fixed dentures

2. fixed and removable dentures

3. removable dentures

4. custom tray

Q12. Processing waxes are used for:

1. *sprue system, cast removable dentures

2. custom trays, sprue system

3. cast removable dentures, custom trays

4. inlays, intermediate part of bridges

Q13. Which wax properties cause its distortion? (mark 2 answers)

1. *Inner stress

2. *Thermal expansion coefficient

3. Setting expansion

4. Hygroscopic expansion

5. Surface tension

Q14. Ash level is:

1. *Percent of incombustible remainder

2. Percent of burnt remainder

3. Percent of evaporated wax

4. Percent of wax shrinkage

Q15. The use of sticky wax:

1. *Connecting of denture parts

2. Modeling of fixed dentures

3. Modeling of removable dentures

4. Modeling of intermediate part of bridges

5. Making of occlusal rims

Q16. Wax for the direct technique should be heated uniformly at 50C (122F) for 15 minutes before use. Why it should be done?

1. *To decrease wax distortion

2. To enhance wax ductility

3. To enhance homogenous consistency

4. To eliminate surface tension

Q17. The wax pattern should be invested quickly for:

1. *To minimize distortion

2. To eliminate surface tension

3. To decrease hygroscopic expansion

4. To minimize brittleness

Q18. What can be used for minimizing a surface tension?

1. *Debubblizer

2. Compensatory varnish

3. Isolation vanish

4. Separation varnish

Q19. Which materials are NON modeling (according to Trezubov’s textbook)?

1. *Cobalt chromium alloys

2. Waxes

3. Resins

4. Low fusible alloys

5. Gypsum

Q20. Which materials are used for denture pattern? (2 answers)

1. *Waxes

2. *Resin

3. Ceramic

4. Low fusible alloys

5. Gypsum