Denture Recovery, Finishing And Polishing Compression Molded Complete Dentures

Front 1

1. T or F
_____ most dentures have undercuts to some degree.

Back 1

True

Front 2

2. Attempting to pry a denture from its processing (master) cast will probably result in:

Back 2

a. breaking the denture
b. distorting the denture

Front 3

3. Undercuts on upper dentures are found:

Back 3

a. commonly beneath the labial flanges
c. frequently in tuberosity areas

Front 4

4. Mandibular denture undercutsw are most commonly found:

Back 4

c. lingual flange regions bilaterally
d. under the labial flanges, anteriorly

Front 5

5. T or F
_____ Undercut casts must be sectioned with a saw to remove smaller pieces as careful as possible.

Back 5

True

Front 6

6. From the list below, select the equipment and materials needed to recover a processed denture
from a master cast.

Back 6

a. a plaster saw and blades
b. a pneumatic chisel
d. a shell blaster
f. sodium citrate solution

Front 7

7. T or F
_____ recovering a denture from its processing cast requires considerable care in sawing and a practical sense of where and how to apply pressure in dislodging the pieces.

Back 7

True

Front 8

8. Uh-oh, I was sniffing the monomer jar again and now I can't remember how to recover dentures! I have the steps here, but they aren't in order. Can you arrange them into their correct order for me.

Back 8

c. Make initial cuts with a plaster saw.
a. remove segments gently by wedging a knife blade in the cut.
b. use a small pneumatic chisel to cut out the pieces that remain in ridge areas.
e. use shell blaster to clean away particles of stone
d. soak denture in sodium citrate solution

Front 9

9. T or F
when using a plaster saw, it is very easy to cut into the resin without realizing it.

Back 9

True

Front 10

10. One way to improve visibility while making cuts is to :

Back 10

d. saw the cast under clear running water

Front 11

11. When sawing a cast you should saw a short distance, remove the saw from the cut, and_______________.

Back 11

check for depth

Front 12

12. When sawing a cast, you should pay special attention to a maxillary denture with a
_________________ since the palate will be on a level with the peripheral borders of the denture.

Back 12

b. walnut shell particles

Front 13

14. T or F
_____ A shell blaster is designed to remove large amounts of stone from a cast

Back 13

FALSE ( it is designed to remove small bits of stone)

Front 14

15. To prevent warping or burning of the denture when shell blasting a denture, it is a good idea to:

Back 14

a. not hold the denture closer than 4 inches from the blaster's nozzle
c. keep the piece of work moving while it is under the shell stream

Front 15

16. To dissolve away the last bits of remaining stone after shell blasting, a denture should besoaked in a solution of ____.

Back 15

sodium citrate.

Front 16

17. T or F
_____ abrasive materials should never be applied to the tissue surfaces of a denture
unless:

Back 16

d. the tissue surface is smooth.

Front 17

18. JEOPARDY QUESTION: " This process of contouring a denture brings it to a desired shape and thickness.'

Back 17

What is finishing?"

Front 18

19. If a wax trial denture is properly ___, ___, and____, there will be little need for finishing work.

Back 18

waxed, packed, and polymerized.

Front 19

20. Arrange the steps for finishing a denture into their correct order.

Back 19

c. Remove all flash and sharp edges of resin from the peripheries of the denture
b. remove flash from around necks of teeth.
d. remove resin bubbles from all surfaces.
a. Smooth the eminence contours at the base of the denture teeth.

Front 20

21. JEOPARDY QUESTION: "This procedure removes all scratches from the denture base and produces a generally glossy finish."

Back 20

"What is polishing?"

Front 21

22. After proper polishing procedures, a denture will:

Back 21

a. accumulate less food debris
b. be easier to clean
c. becomes more stain resistant

Front 22

23. T or F
_____ Polished surfaces feel better to a patient's tongue and are less likely to irritate
other surrounding tissues.

Back 22

True

Front 23

23. T or F
_____ Polished surfaces feel better to a patient's tongue and are less likely to irritate
other surrounding tissues.

Back 23

True

Front 24

25. T or F_
____ A highly reflective, mirror like appearance is the desired level of polish for a denture base.

Back 24

FALSE (this level of finish will "advertise" the work as being a
denture)

Front 25

26. T or F
_____ Each abrasive polishing agent should be used with its own wheel and brush. They
should not be used interchangebly.

Back 25

true

Front 26

27. T or F
_____ During polishing, the denture should be kept moving.

Back 26

True

Front 27

28. Pressing against a wheel too hard while polishing cause the denture to:

Back 27

c. get hot and scorch

Front 28

29. A denture that has acrylic resin teeth should have the ___ and__surfaces of the teeth covered with adhesive tape.

Back 28

lingual and facial

Front 29

30. Arrange the steps for polishing a denture into their correct order.
a. Polish denture teeth that have been selectively ground
b. polish the denture with tripoli on a different set of wheels and brushes
c. complete final polishing with a soft, dry rag wheel impregnated with commercial
polishing compound.
d. Protect the teeth with adhesive tape.
e. polish the denture base with wet pumice applied to a wet rag wheel running at low
speed
f. Use soap and water to scrub all polishing compound residue from the denture surfaces

Back 29

D, E, B, A, C, F

Front 30

31. Used properly, a wet rag wheel at low speed with wet pumice will:
a. reach all flat surfaces and contoured surfaces
b. reach all flat surfaces and most contoured surfaces
c. reach some flat surfaces and most contoured surfaces
d. will reach some flat surfaces and all contoured surfaces

Back 30

B

Front 31

32. The edge of a wet rag wheel at low speed used with wet pumice is useful for polishing___ or other hard to reach places.

Back 31

concavities

Front 32

33. If a rag wheel cannot reach all portions of the palatal area in a maxillary denture, use:
a. wet pumice and a small felt cone
b. dry pumice and a large felt cone
c. wet pumice and a large felt cone
d. dry pumice and a small felt cone

Back 32

C

Front 33

34. Pumice applied with a ____ smooths otherwise inaccessible interproximal areas.

Back 33

brush wheel

Front 34

35. After polishing with pumice and wet wheels, the next step for polishing a denture is to use:
a. tripoli on a different set of wheels and brushes
b. rouge on a different set of wheels and brushes
c. tripolee on a different set of wheels and brushes
d. plaster polish compound

Back 34

A

Front 35

36. T or F_____ When all denture surfaces are smooth, you should wash all the pumice residue from the denture base and dry the denture

Back 35

True

Front 36

37. JEOPARDY QUESTION: "This process can be accomplished by applying a slowly revolving,
off center #6 round bur to desired portions of a denture, but should only be done at the dentist's request.

Back 36

"What is negative stippling?"

Front 37

38. T or F
______ An off center #6 bur can be made by heating the shank in a flame and bending it
90 degrees..

Back 37

FALSE ( it is made by putting a slight bend into the shank, not 90
degrees)

Front 38

39. Placing a bend in a bur causes the bur to wobble when it runs and produces a___ effect on a resin surface.

Back 38

Stippled

Front 39

40. Denture teeth that have been selectively ground do not require polishing operations.

Back 39

FALSE ( they do need to be polished)

Front 40

41. Denture teeth should be polished with ____impregnated with_____ to smooth over cusp and fossa irregularities.

Back 40

pointed rubber wheels ; carbonundum grit

Front 41

42. T or F:
_____Using flour of pumice and a finely abrasive commercial compound will produce a dull, satin polish on denture teeth.

Back 41

FALSE (it produces a high polish)

Front 42

43. Dentsply makes a fine abrasive commercial agent called:
a. Tri-polish #3
b. Tru-polish #3
c. Three polish #3
d. Tripoli #3

Back 42

B

Front 43

44. T or F:
_____ When polishing selectively ground denture teeth, you must be careful to not destroy the details of the occlusal surfaces

Back 43

True

Front 44

45. Final polishing of the denture base is done with a __ impregnated with_ formulated for use with acrylic resin..

Back 44

soft, dry rag wheel ; commercial polishing compound

Front 45

46. T or F:
_____ After polishing is complete, the denture should be washed and all polishing compound residue should be removed.

Back 45

True

Front 46

46. T or F
:_____ After polishing is complete, the denture should be washed and all polishing compound residue should be removed.

Back 46

B & C

Front 47

48. All appliances made from acrylic resin should be stored in a sealed plastic bag that contains:
a. bleach and water solution
b. water
c. benzene
d. ammonia and water solution

Back 47

B

Front 48

49. T or F:
_____ When shipping acrylic resin appliances, they should be shipped in a container
that contains a little bit of water

Back 48

True

Front 49

50. Occasionally, dentures do show defects. List at least three common denture errors.

Back 49

(Denture tooth movement and Incisal Guide Pin
Openings in excess of Acceptable limits);
(Porosity in the denture base); (Fractured Denture Teeth);
(Grainy Appearing Resin); (Denture Base streaks)

Front 50

a. Denture tooth movement

Back 50

1. Using excessive packing pressure
2. Using Plaster instead of dental stone
6. Placing additional resin in the mold after trial packing and before final close* in the flasking procedure

Hint 50

(A = 1, 2, 6 );

Front 51

b. Excessive Incisal
guidepin openings

Back 51

5. Failing to achieve complete metal to metal contact when flask is closed
6. Placing additional resin in the mold after trial packing and before final close*

Hint 51

(B = 5, 6);

Front 52

c. Porosity

Back 52

7. Using insufficient pressure in the mold
20. Packing the resin dough before it was ready
13. Running the mold up to the curing temperature too rapidly

Hint 52

(C = 7, 20, 13);

Front 53

d. Fractured denture teeth

Back 53

11. Applying packing pressure too rapidly
12. Careless deflasking
15. Using resin dough that was too stiff when it was packed.
18. Setting denture teeth in direct contact with the cast.
19. Grinding porcelain denture teeth with a course stone

Hint 53

(D = 11, 12, 15, 18, 19);

Front 54

e. Grainy appearing resins

Back 54

3. Using insufficient monomer to wet all of the powder
10. Letting a packed case stand for a long period before curing

Hint 54

E = 3, 10)

Front 55

f. Craze or check lines
in the acrylic resin

Back 55

16. Allowing the plastic to come into contact with a highly volatile solvent such as acetone or chloroform

Hint 55

(F = 16

Front 56

g. Denture base streaks

Back 56

4. Contamination with dirt and oils from bare hands
8. Failure to stir the monomerpolymer mix thoroughly
9. Dry crusts of resin somehow become
incorporated into the mix.
14. Flaking of tinfoil substitute
17. Using Excess monomer

Hint 56

(G = 4, 8, 9, 14, 17)